Air Conditioning: 1998 Freightliner FL Series FL 70 Repair: System Wiring Diagrams Print Date: 18/11/2016 [PDF]

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18/11/2016

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1998 Freightliner FL Series ­ FL­70 Print Date: 18/11/2016

Repair: SYSTEM WIRING DIAGRAMS

AIR CONDITIONING Fig 1: A/C Circuit, R­12 HOT AT ALL TIMES

FUSE B5 10A

NCA 98A

HOT AT ALL TIMES

FUSE A7 15A

NCA 98

HOT AT ALL TIMES

FUSE A15 40A

POWER DISTRIBUTION MODULE

NCA 98

98R

NCA

87

98

NCA

87A

98T

NCA

30

85

NCA

GND

NCA

98Z

NCA

98A

GND

NCA

NCA

98A

98L

NCA

COMPRESSOR CLUTCH RELAY

86 HEATER BLOWER RELAY

98T NCA

M GND

NCA (OR BLK)

(OR BLK)

NCA BLOWER MOTOR

98A

BINARY SWITCH

NCA

NCA

98A

98A

98R

NCA

98Y

NCA

98E

NCA RESISTOR

NCA

GND

AIR CONDITIONER COMPRESSOR CLUTCH

98Y

NCA

98Z

NCA

98Z

THERMOSTATIC SWITCH NCA

98Z

NCA

98Z

NCA

98Z

NCA

98Z

NCA

98E

NCA

98L

NCA

98Z

NCA

98

NCA

L M H

BLOWER MOTOR SWITCH

DEFROSTER/ DEHUMIDIFIER MICROSWITCH

87A

NCA

98Z

NCA

98Z

AIR CONDITIONER ON/OFF MICROSWITCH

POWER DISTRIBUTION SYSTEM

98

NCA

87

98

NCA

30

71

NCA

GND

NCA

85

86 HEATER/ AIR CONDITIONER RELAY

205800

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Fig 2: A/C Circuit, R­134A HOT AT ALL TIMES

FUSE B5 10A

NCA 98A

HOT AT ALL TIMES

FUSE A7 15A

NCA 98

HOT AT ALL TIMES

FUSE A15 40A

POWER DISTRIBUTION MODULE

NCA 98

98R

NCA

87

98

NCA

87A

98T

NCA

30

85

NCA

GND

NCA

98Z

NCA

98A

GND

NCA

NCA

98A

98L

NCA

COMPRESSOR CLUTCH RELAY

86 HEATER BLOWER RELAY

98T NCA

M GND

NCA (OR BLK)

(OR BLK)

NCA BLOWER MOTOR

98A

BINARY SWITCH

NCA

NCA

98A

98A

98R

NCA

98Y

NCA

98E

NCA RESISTOR

NCA

GND

AIR CONDITIONER COMPRESSOR CLUTCH

98Y

NCA

98Z

NCA

98Z

THERMOSTATIC SWITCH NCA

98Z

NCA

98Z

NCA

98Z

NCA

98Z

NCA

98E

NCA

98L

NCA

98Z

NCA

98

NCA

L M H

BLOWER MOTOR SWITCH

DEFROSTER/ DEHUMIDIFIER MICROSWITCH

87A

NCA

NCA

98Z

POWER DISTRIBUTION SYSTEM

98

NCA

87

98

NCA

30

71

NCA

GND

NCA

85

86

98Z

AIR CONDITIONER ON/OFF MICROSWITCH

HEATER/ AIR CONDITIONER RELAY

205800

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Fig 3: Manual A/C Circuit, R­134A (1 of 2) HOT BAR IGNITION

HOT AT ALL TIMES

V IGN A/C CLUTCH FAN GROUND THERMOSTAT

LOW PRESS RTN LOW PRESS SWITCH HIGH PRESS RTN HIGH PRESS SWITCH

NCA

98

FUSE A7 15A

NCA

98A

98

FUSE A15 40A

NCA

FUSE B5 10A

NCA

71

NCA

NCA COOLING FANS

FUSE A10 5A

98

FUSE XI 10A

POWER DISTRIBUTION MODULE

98

2

RED

1

BLU

3

ORG

4

BLK

5

GRN

1

WHT WHT/BLK

2 3

YEL

NCA

98

NCA

98A

NCA

98

NCA

GND

NCA

98A

GND

NCA

71

NCA

98

NCA

98S

NCA

98Z

NCA

98S

NCA

1

2

HEATER/AC RELAY

98S

NCA

98Z

NCA

98L

NCA

98E

NCA

98Y

NCA

C

H

NCA

L

M

NCA MAIN HEATER A/C SWITCH

NCA

4

YEL/BLK RED RED GRN GRN

98Y

NCA

98E

NCA

98R

NCA

HVAC APADS UNIT

BLOWER RESISTOR

NCA

NCA

NCA

NCA PRES­ SURE SWITCH

98R

NCA

98

NCA

98T

NCA

98L

NCA

GND

NCA

98A

98A

98A

98A

NCA

NCA

NCA

NCA

NCA

NCA

NCA

NCA

NCA

98Z

HIGH PRESSURE SWITCH

HEATER BLOWER RELAY

LOW PRESSURE SWITCH

CUMMNS C10/C12

EXCEPT CUMMINS C10/C12

NCA

98Z

98Z

98Z

NCA

NCA

NCA

98Z NCA

98Z

98A NCA

NCA

98A NCA

NCA

98A NCA

98T

98A

NCA

M GND

NCA BLOWER MOTOR

NCA A/C COMPRESSOR CLUTCH

A/C CLUTCH RELAY

THERMOSTAT

A/C ON­OFF SWITCH

205791

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Fig 4: Manual A/C Circuit, R­134A (2 of 2)

1

2

NCA

98Z

NCA

98Z

NCA

98R 98L

98Z

NCA

NCA NCA AUXILARY HVAC RELAY

NCA

98G

NCA

98W

NCA

98S

98H

NCA

NCA

98L

98W

NCA

NCA

98G

98R

NCA

HVAC RESISTOR UNIT

FAN SWITCH

NCA

M

98G

BLOWER MOTOR

VIGN (12V) POT (CCW­COLD) POT (CW­HOT) POT (CIR­TAP) WTRV+ WTRV+ WTRV­ WTRV­

NCA

98S

NCA

98U

NCA

98J

NCA

98P

NCA

98W

NCA

98W

NCA

98X

NCA

98X

(CCW­COLD)

(CW­HOT)

POTENTIOMETER TEMPERATURE AUXILIARY HVAC CONTROL PANEL

DISCHARGE TEMP CONTROLLER

BEHR AUXILIARY HVAC UNIT

205792

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ANTI­LOCK BRAKES Fig 1: Anti­lock Brakes Circuit, Bendix HOT IN ON OR START NCA

GND

NCA

B4C

NCA

B4C

NCA

71

NCA

71

NCA

71

HOT AT ALL TIMES

CIRCUIT BREAKER 30A

CIRCUIT BREAKER 30A

POWER DISTRIBUTION MODULE

87A 85

30 86

NCA

NCA

B4A

71

71

NCA

NCA

ABS WARNING LAMP

71

NCA

GND

NCA

B4A

NCA

B1K

NCA

85

86

B3F

ABS INDICATOR LAMP RELAY

30 87A

GROUND GROUND GROUND BATTERY VOLTAGE

A1

NCA

GND

A2

NCA

GND

A3

NCA

GND

B1

NCA

B1B

NCA

B1F

NCA

B1J

NCA

LEFT FRAME RAIL

GND

87 ABS PWR RELAY

B2 B3

RF M­21 SOURCE

C1 C2 C3

RF M­21 HOLD

D1 D2 D3

RF M­21 EXH ABS WARNING LMP LF M­21 EXH

E1

NCA

B1H

E3

NCA

B3F

F1

NCA

B2F

G1

NCA

B2G

G2

NCA

B3A

G3

NCA

B3B

H1

NCA

B1G

H2

NCA

B2H

H3

NCA

B3K

J1

NCA

B3J

J2

NCA

B3H

J3

NCA

GND

K1

NCA

B3G

K2

NCA

B2K

K3

NCA

B1K

A1

NCA

1E

NCA

2E

NCA

2D

NCA

1B

E1

NCA

1C

E2

NCA

3D

E3

NCA

3C

F1

NCA

1D

F2

NCA

3E

F3

NCA

2C

E2

F2 F3

LF M­21 HOLD SERIAL A + SERIAL B ­ LF M­21 SOURCE RF WHL SPD SENS RF WHL SPD SENS LF WHL SPD SENS LF WHL SPD SENS GROUND RETARDER INTERRUPT ECU PWR +12V ECU PWR +12V RR M­21 SOURCE

DIAGNOSTIC CONNECTOR

LEFT FRAME RAIL

B3G

NCA

RETARDER INTERRUPT CONNECTOR

A2 A3

RR M­21 HOLD

B1 B2 B3

RR M­21 EXH

C1 C2 C3

LR M­21 EXH

D1 D2 D3

LR M­21 HOLD RR WHL SPD SENS RR WHL SPD SENS LR M­21 SOURCE LR WHL SPD SENS LR WHL SPD SENS

LEFT WHEEL SENSOR (REAR AXLE)

NCA

2C

NCA

3E

B

RIGHT WHEEL SENSOR (REAR AXLE)

C

LEFT ABS MODULATOR VALVE (REAR AXLE)

A

A

C

B

RIGHT ABS MODULATOR VALVE (REAR AXLE)

B

LEFT WHEEL SENSOR (FWD AXLE)

RIGHT WHEEL SENSOR (FWD AXLE)

C

A

LEFT ABS MODULATOR VALVE (FWD AXLE)

A

C

B1F

NCA

B1J

NCA

B1H

NCA

B2F

NCA

B2G

NCA

B1G

NCA

B2H

NCA

B3K

NCA

B3J

NCA

B3H

NCA

1E

NCA

2E

NCA

2D

NCA

1B

NCA

1C

NCA

1D

NCA

3D

NCA

3C

NCA

ELECTRONIC CONTROL UNIT (MOUNTED ON VALVE)

B

RIGHT ABS MODULATOR VALVE (FWD AXLE)

205927

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Fig 2: Anti­lock Brakes Circuit, WABCO (1 of 2) HOT AT ALL TIMES

NCA XR2

FUSE 10A

NCA XR1

FUSE 10A

NCA

NCA XBAT

NCA XBAT

FUSE ABS PWR 30A

NCA X9

FUSE 5A

NCA X71D

NCA X71D

FUSE IGN CONT 10A

NCA

HOT IN ON OR START POWER DISTRIBUTION MODULE

NCA X71D

NOTE: ON 6X4 TRACTORS WITH SPRING­TYPE SUSPENSION, THE WHEEL SENSORS ARE LOCATED ON THE FORWARD­REAR AXLE. IF EQUIPPED WITH AIR SUSPENSION, THE COMPONENTS ARE ON THE REARMOST AXLE. XR2

NCA

XR1

NCA

X9

NCA

X71D

NCA

X1

NCA

1

NCA

X1

2

BLK

X2

3

NCA

X3

X3

NCA

4

BRN

X4

X4

BRN

5

BLU

X5

X5

BLU

6

BRN

X6

7

BLU

X7

X7

BLU

8

NCA

X8

X8

NCA

9

NCA

X9

10

NCA

X10

11

NCA

X11

13

NCA

14

NCA

15

BLK

X15

16

BRN

X16

17

BRN

X17

18

BLK

X18

19

NCA

X19

20

BLK

X20

21

BRN

22

BLU

23

X6

BRN

X9

NCA

X11

NCA

X13

X13

NCA

X14

X14

NCA

X21

X21

BRN

X22

X22

BLU

BRN

X23

X23

BRN

24

BLU

X24

X24

BLU

25

NCA

X25

X25

NCA

26

NCA

X26

X26

NCA

27

NCA

X27

X27

NCA

28

NCA

X28

X28

NCA

29

NCA

X29

X29

NCA

30

NCA

X30

X30

NCA

31

NCA

X31

X31

NCA

32

BRN

X32

33

BLK

X33

34

BLK

X34

35

BRN

X35 X19

NCA

39

GND

BRN

40

GND

BRN

1 2 3 4 5 6 7 8 9 10 11 12

(NOT USED)

12

36 37

13 14 15

16 17 18 19 20 21 22 23 24 25 26

27

38

41

28 29

42 43 44 45 46 47 48 49 50 51

BLK

X51

52

BRN

X52

53

BLK

X53

54

BRN

X54

LEFT WHEEL E SENSOR

RIGHT WHEEL F SENSOR

LEFT WHEEL C SENSOR

RIGHT WHEEL B SENSOR

RIGHT WHEEL D SENSOR

LEFT WHEEL A SENSOR

(REAR AXLE 2)

(REAR AXLE 2)

(REAR AXLE 1)

(FWD AXLE)

(REAR AXLE 1)

(FWD AXLE)

RIGHT ASR VALVE

BRN GND

BLK X2

BRN GND

BLK X20

BLK X15

BRN X32

BRN X16

BLK X33

BRN X17

BLK X34

BLK X18

BRN X35

BLK X51

BRN X52

BLK X53

BRN X54

ELECTRONIC CONTROL UNIT

LEFT ASR VALVE

TRACTION CONTROL 205925

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Fig 3: Anti­lock Brakes Circuit, WABCO (2 of 2) X4

BRN

X5

NOTE: ON 6X4 TRACTORS WITH SPRING­TYPE SUSPENSIONS THE WHEEL SENSORS ARE LOCATED ON THE FORWARD­REAR AXLE. IF EQUIPPED WITH AIR SUSPENSION, THE COMPONENTS ARE ON THE REARMOST AXLE.

BLU

GRN/YEL

GND

RIGHT ABS SOLENOID VALVE (REAR AXLE 1)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

X6

BRN

X7

BLU

GRN/YEL

GND

NCA

XR2

NCA

XR1

NCA

X9

NCA

X71D

NCA

X1

NCA

X3

BRN

X4

BLU

X5

BRN

X6

BLU

X7

NCA

X8

NCA

X9

RIGHT ABS SOLENOID VALVE (FWD AXLE) X21

BRN

X22

BLU GRN/YEL

GND

LEFT ABS SOLENOID VALVE (REAR AXLE 1) X23

NCA

X11

NCA

X13

NCA

X14

BRN

BLU

X24 GND

GRN/YEL LEFT ABS SOLENOID VALVE (FWD AXLE)

16 17 18 19 20 21 22 23 24 25 26

27

28

NCA NCA

X21

BLU

X22

BRN

X23

BLU

X24

NCA

X25

X71

NCA

NCA

X26

X8L

NCA

NCA

X27

NCA

X28

NCA

X29

NCA

X30

NCA

X31

NCA

VR1 RELAY

X19

BRN

GND

BRN

GND

XR2

NCA

X71

NCA

XR25

NCA

X19

NCA

X1B

NCA

X8L

NCA

X8

NCA

VR2 RELAY

NCA XGND

29

X1 XR1

BRN

X71 NCA GND

NCA

X26

NCA

X26L

NCA

INTERFACE

DIAGNOSTIC SWITCH

GAUGE CLUSTER

X3

X3

NCA

71D

NCA

NCA

GND

NCA

NCA

NCA

X31

GND

GND

F

NCA X121

C

E

DEEP MUD SNOW IND (ATC)

NCA

ABS OFF ROAD SWITCH

WHL SPIN IND

ATC FUNCTION SWITCH (IF EQUIPPED)

ATC RELAY (IF EQUIPPED)

X1B

NCA

X121

NCA

X121

NCA

X11

NCA

ENGINE BRAKE RELAY

X121

B TRAC ABS IND

NCA

GNDB NCA

X3

NCA

X26L

NCA

X14

NCA

X13

NCA

NCA X13

X13

GND

NCA

X14

NCA

NCA

X14

NCA

GND

NCA

X30

NCA

X28

NCA

X29

NCA

XGND

NCA

NCA

GND

NCA

WARN LAMP RELAY

ENGINE (COMPRESSION) BRAKE

205926

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COMPUTER DATA LINES Fig 1: Computer Data Lines Circuit HOT AT ALL TIMES

DDEC II, DDEC III & CATERPILLAR

2 CUMMINS M11+ 3 CUMMINS ISB/ISC

331

NCA

FUSE X5 5A

1

POWER DISTRIBUTION MODULE

NCA

D900 (OR C792) (OR N08)

NCA

D901 (OR C793) (OR N27)

NCA

NCA

3

2

49

1

8

C2

50

27

C1

50­PIN

28­PIN

30­PIN ENGINE CONTROL MODULE

DATALINK TERMINATING RESISTOR R2 120 OHMS NCA

J1939­

NCA

21

J1939+

NCA

19

1587+E

NCA

17

1587­E

NCA

NCA DATALINK TERMINATING RESISTOR R1 120 OHMS

18 VC1 VCU (MB MOD 283 & 286)

NCA

331

A

NCA

1587+

1587+

NCA

B

NCA

1587­

1587­

NCA

NCA

1939+

NCA

1939+

NCA

1939­

NCA

1939­

EXCEPT WTEC III

1939+

NCA

NCA

1939­

NCA DIAGNOSTIC CONNECTOR

ABS/WABCO ECU

WTEC III

J1587­T (OR E151)

NCA

17

J1587+T (OR E142)

NCA

8

1

M34B

S

17

205955

ENGINE ECU

ABS ECU

1939+

NCA

1939­

NCA

1939+

NCA

1939­

NCA

1939­

NCA

1939+

NCA

WTEC­III TRANSMISSION ECU (WTEC­III) WT TRANSMISSION ECU (EXCEPT WTEC­III)

TRANSMISSION

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COOLING FAN Fig 1: Cooling Fan Circuit HOT AT ALL TIMES

NCA

NCA

NCA NCA

NCA

FAN OVERRIDE SWITCH

NCA NCA NCA NCA

NCA

NCA

FOOT THROTTLE NCA

NCA NCA AIR TEMPERATURE SENSOR

NCA

NCA

NCA ENGINE ECM

NCA COOLANT TEMPERATURE SENSOR

NCA NCA

NCA

NCA

NCA

NCA

NCA

NCA

NCA

FAN RELAY (IF EQUIPPED)

FAN CLUTCH SOLENOID VALVE

ENGINE SPEED SENSOR

A/C PRESSURE SWITCH

205814

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CRUISE CONTROL Fig 1: Cruise Control Circuit, Caterpillar HOT AT ALL TIMES

POWER DISTRIBUTION MODULE

C812

NCA

FUSE 20A

C985

NCA

A

RED

C986

NCA

C

WHT

C993

NCA

B

BLK

THROTTLE POSITION SENSOR

C409

NCA

C933

NCA

A/T

NCA

C993

C A/T

A

NCA

C

NCA

A

NCA

B

NCA

C993

NCA

C977

C409

NCA

C993

NCA

TRANS NEUTRAL SWITCH M/T

M/T

C409

NCA

C993

NCA

(NOT USED)

CLUTCH SWITCH

CLUTCH SWITCH TPS SUPPLY +8V THROTTLE POS SIG TRANS NEUTRAL SW CRUISE ENABLE SENSOR COMMON CRUISE SET DATA LINK J1587+ DATA LINK J1587­ CRUISE RESUME TACH DRIVE SIG ­ TACH DRIVE SIG + SPEED0 DRIVE SIG ­ SPEED0 DRIVE SIG + SERVICE BRAKE SW1 SERVICE BRAKE SW2 VEHICLE SPEED ­ VEHICLE SPEED +

C993

NCA

5

C985

C975

NCA

1

NCA

C986

GND1

NCA

10

NCA

C409

29AA

NCA

9

20

NCA

C975

29

NCA

C993

C993

NCA

3

C993

NCA

25

NCA

C978

C978

NCA

7

NCA

C793

J1587+

NCA

A

1

NCA

C792

J1587­

NCA

B

15

NCA

C979

11

NCA

C451

24

NCA

C977

35

NCA

37 38

CRUISE ON/OFF SWITCH

DIAGNOSTIC CONNECTOR

BLK

SET SWITCH

2 C979

NCA

C993

NCA

6

29AB

NCA

9

GND2

NCA

10

17

NCA

C450

10

NCA

C974

16

NCA

C973

14

NCA

C992

29AC

NCA

29AD

NCA

23

NCA

C900

GND3

NCA

GND4

NCA

12

NCA

C785

18

NCA

C784

ENGINE CONTROLS SYSTEM

8 RESUME

CRUISE SET/RESUME SWITCH

INTERIOR LIGHTS SYSTEM

C933

NCA

A

C992

NCA

A

AIR BRAKE

ENGINE CONTROL MODULE

BLK

SET

1 7

A

B

NCA

NCA

C993

NCA

C992

NCA

HYDRAULIC BRAKE

C784

SERVICE BRAKE SWITCH 1 C993

NCA

C

NCA

C992

NCA

B

NCA

A

NCA

C785

SERVICE BRAKE SWITCH 1

VEHICLE SPEED SENSOR 99

NCA

A

C900

NCA

A

AIR BRAKE

C900

NCA

99

NCA

C900

NCA

HYDRAULIC BRAKE

SERVICE BRAKE SWITCH 2 99

NCA

C

NCA

C900

NCA

A

NCA

B

NCA SERVICE BRAKE SWITCH 2

205822

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Fig 2: Cruise Control Circuit, Cummins ISB/ISC HOT AT ALL TIMES FUSE 7.5A

NCA

POWER DISTRIBUTION MODULE

N98C

FUSE 7.5A

NCA

NCA

N98A

NCA

FUSE 7.5A

NC26

FUSE 15A

N98B

HOT IN ON OR START

N03

NCA

N07

NCA

A

BLK

B

BLK VEHICLE SPEED SENSOR

B N04

NCA

A

N10A

NCA

C

NC

NCA

NO COM

NCA NCA CLUTCH SWITCH

KEY SW PWR B+ B+ B+

5

NCA

NC26

39

NCA

N98A

40

NCA

N98B

38

NCA

N98C

A

SAE ­ CLUTCH SIG CRU ON SIG IDLE INCREMENT IDLE DECREMENT CRU SET SIG CRU RESUME SIG THRTL ACTIVE SIG IDLE ACTIVE SIG TPS RETURN TPS INPUT TPS ­5VDC BRAKE SIG WIF RETURN WIF SIG

NA16

NCA

N03

19

NCA

N07

49

NCA

J1587+

J1587+

NCA

A

50

NCA

J1587­

J1587­

NCA

B

27

NCA

N04

14

NCA

N02

35

NCA

N14

36

NCA

N23

13

NCA

N12

7

NCA

N22

25

NCA

N09

26

NCA

N06

19

NCA

N19

30

NCA

N11

29

NCA

N18

33

NCA

N13

20

NCA

NB20

40

NCA

NB40

NCA

NCA

5

NCA

10

29AC

NCA

9

N02

NCA

1

N10D

NCA

5

GND1

NCA

10

29AA

NCA

9

29AB

NCA CRUISE CONTROL ON/OFF SWITCH

INTERIOR LIGHTS SYSTEM

B

NCA B

NCA

N10G GND3

ENGINE CHECK SWITCH

ENGINE CONTROL MODULE

A

1

DIAGNOSTIC CONNECTOR

NCA

SAE +

NCA

8

NCA

29AE

VSS RETURN

37

GND6

VSS INPUT

NA16

NB40

NB20

WIF SENSOR

29AB

NCA

9

GND1

NCA

10

GND2

NCA

N10B

NCA

N10B

NCA

N10E

NCA

N12

NCA

6

3 1

SET

7 86

NCA

GND

85

NCA

35G

2

INTERIOR LIGHTS SYSTEM

N22

NCA

8 RESUME

29AD NCA 9

GND4 NCA 10

N10H NCA 3

N09 NCA D

6

N14 NCA 1

N23 NCA 7

N10F NCA F

2

N06 NCA

8

N19 NCA

N10

E

N13

N13

B

NCA W/ AIR BRAKES

N11

SERVICE BRAKE RELAY

NCA

CRUISE CONTROL SET/RESUME SWITCH

N10C

N18

NCA

NCA

N10

87A

W/ HYDRAULIC BRAKES

NCA

NCA

N13

C

87

NCA

A

30

NCA SERVICE BRAKE SWITCH

TPS

IVS TPS/IVS SENSOR

IDLE INC/DEL SWITCH

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Fig 3: Cruise Control Circuit, Cummins M11+ HOT IN ON OR START

NCA

POWER DISTRIBUTION MODULE

N03

NCA

N07

NCA

A

BLK

NC26

FUSE 15A

B

BLK VEHICLE SPEED SENSOR

B

NCA

N04

NCA

A

NCA

N10A

NCA

C

NCA CLUTCH SWITCH

N13

NCA

A

N10C

NCA

A SERVICE BRAKE SWITCH

DIAGN VSS INPUT VSS RETURN BRAKE SIG SAE J1587+ SAE J1587­ CRU ON SIG IDLE INCREMENT IDLE DECREMENT THRTL ACTIVE SIG IDLE ACTIVE SIG TPS RETURN TPS INPUT TPS ­5VDC CLUTCH SIG CRU SET SIG CRU RESUME SIG SW COMMON

NCA

NA05

N

NCA

NA23

A

NCA

NC26

V

NCA

NA16

3

NCA

N03

7

NCA

N07

13

NCA

N13

27

NCA

N27

J1587+

NCA

A

8

NCA

N08

J1587­

NCA

B

2

NCA

N02

14

NCA

N14

23

NCA

N23

9

NCA

N09

6

NCA

N06

19

NCA

N19

11

NCA

N11

18

NCA

N18

4

NCA

N04

12

NCA

22

NCA

10

NCA

N10

COMPUTER DATA LINES SYSTEM

N10G

NCA

5

NA16

NCA

1

GND3

NCA

10

29AC

NCA

9

DIAGNOSTIC CONNECTOR

CHECK ENGINE SWITCH

N02

NCA

N10D

NCA

29AA

NCA

N12

29AB

NCA

N22

GND1

NCA

NCA

SAE J1922­ KEY SW PWR

P

1

5 9 10

29AE

SAE J1922+

CRUISE CONTROL ON/OFF SWITCH

ENGINE CONTROL MODULE

B

D

PAUSE

D

NCA

N04

NCA

A

GND6

INTERIOR LIGHTS SYSTEM

PAUSE

COM

29AB

NCA

9

GND1

NCA

10

GND2

NCA

N10B

NCA

B

NCA

N12

C

NCA

N22

N10B

NCA

A

NCA

N10

N10E

NCA

N12

NCA

NCA N10J

29AD

GND4

NCA

D

9

NCA

F

NCA

N09

NCA

10

N10F

NCA

2

N06

NCA

E

8

N11

N19

NCA

B

C

NCA N18

CRUISE CONTROL SWITCH

TPS

205823

8

CRUISE CONTROL SET/RESUME SWITCH

A

SHIFTER

NCA

RESUME

6

N04 N10H

N12

NCA

N14

N22

NCA

D

NCA

NCA

B

3

C

SET

2 N22

N23

N10

NCA

NCA

NCA

SET

A

1

A

ENGINE CONTROLS SYSTEM

RES

3 1 7

7

B

6

IVS

TPS/IVS SENSOR (ON THROTTLE PEDAL)

IDLE INC/DEL SWITCH

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Fig 4: Cruise Control Circuit, DDEC III HOT AT ALL TIMES

HOT AT ALL TIMES

POWER DISTRIBUTION MODULE

FUSE 15A

D953

D150

NCA

NCA

D439

NCA

NCA D240

D241 NCA

NCA

FUSE 15A

NCA

A

SAE J1922­ DATA LINK + DATA LINK ­ ECM POWER ECM POWER IGNITION TO ECM 12V ECM GND VEHICLE SPEED + VEHICLE SPEED ­ CLUTCH SWITCH PARK BRAKE SW

D800

B

NCA

D801

C2

NCA

D900

NCA

C1

NCA

NCA

D901

C

NCA

D241

A

NCA

D240

B3

NCA

D439

D

NCA

D150

E2

NCA

D556

E3

NCA

D557

J2

NCA

D531

H2

NCA

D524

G2

NCA

D543

VEHICLE SPEED SENSOR

CRUISE ENABLE SET/COAST RESUME/ACCEL PTO/VSG SENSOR GND SENSOR SUPPLY THROTTLE POS SIG

NCA

NCA

A

NCA

D953A

NCA

C

NCA

NCA

CLUTCH SWITCH

D524

NCA

A

D953B

NCA

A PARK BRAKE SWITCH

D531

G1

NCA

D528

F2

NCA

D544

J1

NCA

D541

NCA

D541

G3

NCA

D545

NCA

D545

D1

NCA

D510

C3

NCA

D952

A3

NCA

D916

D2

NCA

D417

D543

NCA

A

D953C

NCA

A SERVICE BRAKE SWITCH

D953

DIAGN REQ & S/D O/R

B D531

COMPUTER DATA LINES SYSTEM J1587+ A DIAGNOSTIC J1587­ B CONNECTOR

NCA

SERVICE BRAKE SW

NCA

BLK

D953

SAE J1922+

A

B

D953

NCA

NCA

BLK

NCA

D953G

NCA

5

D528

NCA

1

GND4

NCA

10

29AD

NCA

9 DIAGNOSTIC REQUEST & S/D O/R SWITCH

D953D

NCA

5

1

NCA NCA

10

29AA

NCA

9

29AB

NCA

29AF

D544 GND1

CRUISE ON/OFF SWITCH

NCA

NCA

29AE

ENGINE CONTROL MODULE

D952B

D916B

D510

NCA

NCA

NCA

B

C

A

D952A NCA C

D916A NCA

B

A

D417 NCA

SET A

RES B

COM D

PAUSE B

SHIFTER

A

PAUSE

CRUISE CONTROL SWITCH

TPS RPM/PTO INTERFACE (OPTIONAL) 205821

GND6 NCA

D952 NCA

GND5 NCA

D916 NCA

D541 NCA B

D545

D531

D953 NCA

NCA

NCA C

D

A

D953

D545

NCA

NCA

NCA B

C

NCA D

A

D531

D541

INTERIOR LIGHTS SYSTEM 29AB

NCA

9

GND1

NCA

10

GND2

NCA

D953H

NCA

D953H

NCA

D953E

NCA

D541

NCA

6

3 1

S/D

7 2 D545

NCA

8 R/A CRUISE SET/RESUME SWITCH

THROTTLE POSITION SENSOR

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Fig 5: Cruise Control Circuit, DDEC II HOT IN IGNITION

HOT IN IGNITION

A

NCA

D439D

A

NCA

D439D

A

NCA

D439E

D953

NCA

D240

NCA

D241

NCA

NCA

D953

D953

D439C

NCA

NCA

D439C

D953 NCA

A

NCA

NCA

A

D439B

D953

WHT

NCA

POWER DISTRIBUTION MODULE

FUSE 15A

NCA

B

FUSE 15A

D439

4 C

D439B

NCA BLK RED

FUSE 5A

HOT AT ALL TIMES

2

FUSE 10A

HOT AT ALL TIMES

CLUTCH SWITCH

SERVICE BRAKE SWITCH

PARK BRAKE SWITCH

RESUME/ACCEL ON SENSOR SUPPLY THROTTLE POS SIGNAL SENSOR RETURN VEHICLE SPEED + VEHICLE SPEED ­

30

E

NCA

D150

G2

NCA

D543

J2

NCA

D531

E1

NCA

D451

G1

NCA

D528

C2

NCA

D900

NCA

J1587+

A

C1

NCA

D901

NCA

J1587­

B

J1

NCA

D541

F1

NCA

D542

F2

NCA

D544

D953

NCA

G3

NCA

D545

D953A

NCA

D953A

NCA

A3

NCA

D916 GND

NCA

10

29A

NCA

9

29A

NCA

CRUISE RELAY

D451

NCA

D953

NCA

5­PIN

D2

NCA

D417

C3

NCA

D952

E2

NCA

D556

E3

NCA

D557

ENGINE CHECK BUTTON

DIAGNOSTIC CONNECTOR

INTERIOR LIGHTS SYSTEM

D953

NCA

5

D528

NCA

1

GND

NCA

GND

NCA

10

29A

NCA

29A

NCA

9 SHUTDOWN OVERRIDE SWITCH

5

1

CRUISE ON/OFF SWITCH

29A

NCA

9

GND

NCA

10

D953A

NCA

6

D953A

NCA

D953A

NCA

D541

NCA

1

D542

NCA

7

D544

NCA

2

D545

NCA

8

30­PIN

VEHICLE SPEED SENSOR

A RED

B BLK

BLK

A

NCA

NCA

ENGINE CONTROL MODULE

NCA

D240

D916

SET/COAST OFF RESUME/ACCEL OFF

D953A

NCA

SET/COAST ON

87A

C

DATA LINK ­

NCA

WHT

DATA LINK +

87

D531

NCA

D417

STOP ENG OVERRIDE

NCA

A

NCA

DIAGNOSTIC REQUEST

86

D543

D241

B

BRAKE/CLUTCH ON

NCA

NCA

BLK

BRAKE/CLUTCH OFF

85

GND

C

D952

HIGH POWER GROUND

NCA

30­PIN

D556

BANK A POWER

D439

NCA

BANK B POWER

NCA

D557

IGNITION

B3

D439E

3 S/D

R/A PMTPS CRUISE SET/RESUME SWITCH

205820

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Fig 6: Cruise Control Circuit, MB Module 283 A

NCA

HOT AT ALL TIMES

36

B

NCA

36G

NCA

3

NCA

GND

1

NCA

36G

2

NCA

457B

4

NCA

440

ANTI LOCK BRAKES SYSTEM

36G

FUSE 10A

POWER DISTRIBUTION MODULE

NCA

439B

NCA

4

BRAKE SWITCH

440B HYDRAULIC BRAKE NCA

440B

NCA

440

SERVICE BRAKE RELAY

NCA

NCA

439S+

NCA

A

439S­

NCA

B

440B

VEHICLE SPEED SENSOR AIR BRAKE

440

440

NCA

C

440C

NCA

A

SERVICE BRAKE SWITCH

TRANS SW NEUTRAL TVC SPEED AXLE VSS SIG VSS GND

COOLANT LEVEL FLAME STRT FUEL VLV GRID HTR/FLAME STRT

1

NCA

439N

2

NCA

299A

3

NCA

439S+

4

NCA

439S­

CLUTCH SWITCH

TRANSMISSIONS SYSTEM ENGINE CONTROLS SYSTEM

VCU/PDU CAN LOW

NCA

J D

440

NCA

5

440

NCA

H

6

440

NCA

B

440

NCA

G

440

NCA

L

440

NCA

M

7

NCA

440L

9

NCA

431D

10

NCA

431B

NCA

439D+

NCA

439D­

8

11

AIR CONDITIONING SYSTEM ENGINE CONTROLS SYSTEM

ABS RELAY 440

12 VCU/PDU CAN HIGH

440

13 15

440*

NCA

4

440*

NCA

3

440J

NCA

5

440K

NCA

1

COMPUTER DATA LINES SYSTEM

14

NCA

SPLICE 2

VC4 2

1 CLUTCH IDLE VALIDATION GND CC SET/COAST CC RESUME/ACCEL CC ON/OFF ENGINE BRAKE LOW ENGINE BRAKE HIGH

SHUT DOWN OVERRIDE A/C FAST IDLE FAN OVERRIDE

2

NCA

440C

3

NCA

440G

4

NCA

440E

5

NCA

440F

6

NCA

440D

8

NCA

440J

9

NCA

440K

6 29AF

NCA

9

GND6

NCA

10

7

ENGINE BRAKE SWITCH (OFF/LOW/HIGH) GND6

NCA

10

29AF

NCA

11

GND5

NCA

E

12

29AE

NCA

K

GND3

NCA

C

29AC

NCA

M

13

NCA

440U

14

NCA

440Y

15

NCA

440Z

AIR CONDITIONING SYSTEM

16

440

NCA

F L SPLICE 1

5

17 18 VC2

440H

5 6

NCA

440A

7

NCA

431C

NCA

440P+

20

NCA

10

440

NCA

9

29AE

NCA

9

NCA

10

440

NCA

6

440

NCA

440E

NCA

NCA 440

29AG GND7

3

1

S/D

7

B

NCA 440G

19

NCA

18

440VI

17

GND5

440B

NCA

NCA

16

NCA

15

9

440P­

10

NCA

440

440V2

14

NCA

440VI

NCA

5

440T

NCA

13

1

NCA

12

440U

10 11

NCA

CRUISE ON/OFF SWITCH

8 9

1

440D GND7

INSTRUMENT CLUSTER SYSTEM

440V2

SERVICE BRAKE

NCA

SPLICE 3

NCA

TPS SENSOR COMMON

440

440T

IDLE VALIDATION SW 2

NCA

4

NCA

TPS SIGNAL IDLE VALIDATION SW 1

3

D

440P+

TPS POWER

439A

NCA

CHECK ENGINE PRE HTR IND LAMP SIG

439B

NCA

440P­

STOP ENGINE

NCA

2

NCA

SENSOR COMMON

1

NCA

BAT+

2

21 VC1

440F

VCU

NCA

8 R/A

THROTTLE POSITION SENSOR

ENGINE CHECK SWITCH

SPEED AXLE SHUTDOWN OVERRIDE

CRUISE SET/RESUME SWITCH

205825

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Fig 7: Cruise Control Circuit, MB Module 286 A

NCA

HOT AT ALL TIMES

36

B

NCA

36G

NCA

3

NCA

GND

1

NCA

36G

2

NCA

457B

4

NCA

440

ANTI LOCK BRAKES SYSTEM

36G

FUSE 10A

POWER DISTRIBUTION MODULE

NCA

439B

NCA

4

BRAKE SWITCH

440B HYDRAULIC BRAKE NCA

440B

NCA

440

SERVICE BRAKE RELAY

NCA

NCA

439S+

NCA

A

439S­

NCA

B

440B

VEHICLE SPEED SENSOR AIR BRAKE

440

440

NCA

C

440C

NCA

A

SERVICE BRAKE SWITCH

TRANS SW NEUTRAL TVC SPEED AXLE VSS SIG VSS GND

COOLANT LEVEL FLAME STRT FUEL VLV GRID HTR/FLAME STRT

1

NCA

439N

2

NCA

299A

3

NCA

439S+

4

NCA

439S­

CLUTCH SWITCH

TRANSMISSIONS SYSTEM ENGINE CONTROLS SYSTEM

VCU/PDU CAN LOW

NCA

J D

440

NCA

5

440

NCA

H

6

440

NCA

B

440

NCA

G

440

NCA

L

440

NCA

M

7

NCA

440L

9

NCA

431D

10

NCA

431B

NCA

439D+

NCA

439D­

8

11

AIR CONDITIONING SYSTEM ENGINE CONTROLS SYSTEM

ABS RELAY 440

12 VCU/PDU CAN HIGH

440

13 15

440*

NCA

4

440*

NCA

3

440J

NCA

5

440K

NCA

1

COMPUTER DATA LINES SYSTEM

14

NCA

SPLICE 2

VC4 2

1 CLUTCH IDLE VALIDATION GND CC SET/COAST CC RESUME/ACCEL CC ON/OFF ENGINE BRAKE LOW ENGINE BRAKE HIGH

SHUT DOWN OVERRIDE A/C FAST IDLE FAN OVERRIDE

2

NCA

440C

3

NCA

440G

4

NCA

440E

5

NCA

440F

6

NCA

440D

8

NCA

440J

9

NCA

440K

6 29AF

NCA

9

GND6

NCA

10

7

ENGINE BRAKE SWITCH (OFF/LOW/HIGH) GND6

NCA

10

29AF

NCA

11

GND5

NCA

E

12

29AE

NCA

K

GND3

NCA

C

29AC

NCA

M

13

NCA

440U

14

NCA

440Y

15

NCA

440Z

AIR CONDITIONING SYSTEM

16

440

NCA

F L SPLICE 1

5

17 18 VC2

440H

5 6

NCA

440A

7

NCA

431C

NCA

440P+

20

NCA

10

440

NCA

9

29AE

NCA

9

NCA

10

440

NCA

6

440

NCA

440E

NCA

NCA 440

29AG GND7

3

1

S/D

7

B

NCA 440G

19

NCA

18

440VI

17

GND5

440B

NCA

NCA

16

NCA

15

9

440P­

10

NCA

440

440V2

14

NCA

440VI

NCA

5

440T

NCA

13

1

NCA

12

440U

10 11

NCA

CRUISE ON/OFF SWITCH

8 9

1

440D GND7

INSTRUMENT CLUSTER SYSTEM

440V2

SERVICE BRAKE

NCA

SPLICE 3

NCA

TPS SENSOR COMMON

440

440T

IDLE VALIDATION SW 2

NCA

4

NCA

TPS SIGNAL IDLE VALIDATION SW 1

3

D

440P+

TPS POWER

439A

NCA

CHECK ENGINE PRE HTR IND LAMP SIG

439B

NCA

440P­

STOP ENGINE

NCA

2

NCA

SENSOR COMMON

1

NCA

BAT+

2

21 VC1

440F

VCU

NCA

8 R/A

THROTTLE POSITION SENSOR

ENGINE CHECK SWITCH

SPEED AXLE SHUTDOWN OVERRIDE

CRUISE SET/RESUME SWITCH

205825

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ELECTRONIC SUSPENSION Fig 1: Electronic Suspension Circuit IGNITION

ECAS AUTO LOAD TRANSFER OFF INDICATOR LIGHT (AMBER LENS) (CENTER GAUGE PANEL) BLK NCA A

BLK NCA B

GND

434B

81C

NCA B

81C

NCA

434

NCA

NCA A

BLK

ECAS SYSTEM FAIL INDICATOR LIGHT (RED LENS) (CENTER GAUGE PANEL)

IGN SUPPLIED CB 500MA

BLK

CONSTANT PWR CB 15A

434C

HOT AT ALL TIMES

NCA

NCA

434A

1

NCA

434

2

NCA

J1587+

NCA

A

NCA

J1587­

NCA

B

NCA

434A

NCA

81C

81C

81C

NCA

81C

NCA

NCA

STOPLIGHT SWITCH (AIR/OIL JUNCTION BLOCK)

3 4

DIAGNOSTIC CONNECTOR

5 6 7 8 9 10 11 12 NCA

434F 434F

NCA

3

15

NCA

434G

434G

NCA

2

16

NCA

434M

434H

NCA

1

17

NCA

434N

GND

NCA

4

20

NCA

434K

21

NCA

434E

81C

NCA

E

22

NCA

434L 434M

NCA

B

X12

NCA

A

13 14

18 19

SOLENOID VALVE

23 24 25

NCA

434J

NCA

GND

NCA

434H

26 27

C

28 D

29 30 31

434C

NCA

F

32 33

NCA

434B

NCA

434D

ECAS AUTO LOAD TRANSFER ON/OFF SWITCH (SWITCH PANEL)

34 35 ECAS ECU

CLOCK DATA IGN PWR GND

3 NCA

434D

4 NCA

434E

1 NCA

81C

2 NCA

GND

DISTANCE SENSOR

X12

NCA 12

GND NCA

LOAD TRANSFER MOMENTARY­ON SWITCH (SWITCH PANEL)

GND

434J NCA

1

NCA

GND NCA

2

A

434N C NCA

434K NCA

SPEED SIGNAL SENDER

B NCA

434L NCA

HAND CONTROL RECEPTACLE ASSY

ABS ECU

205997

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ENGINE ACCESSORIES Fig 1: Engine Brake Circuit, Detroit Diesel DDEC III

ENGINE CONTROL MODULE

NCA

D583

NCA

2

D979

NCA

5

D979

NCA

1

D979

NCA

D953

NCA

D953

NCA

29A

NCA

9

GND

NCA

10

6 4

K2

K3

NCA

NCA

D583

D979

NCA BATTERY

D953

INTERIOR LIGHTS SYSTEM (INSTRUMENT ILLUMINATION)

3

JAKE BRAKE SWITCH 205779

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Fig 2: Engine Brake Circuit, Detroit Diesel DDEC II HOT IN IGNITION

FUSE BLOCK

FUSE 10A

121A

NCA

D439C

NCA

NCA

NCA

CRUISE CONTROL SYSTEM

D439B

D439D

121

NCA

SERVICE BRAKE PRESSURE SWITCH

121B

NCA

121D

NCA

2

121C

NCA

5

121C

NCA

1

121C

NCA

4 6

1

NCA

121A

5

NCA

D508

ENGINE CONTROL SYSTEM (IDLE GND SIG)

4

NCA

121

2

NCA

121B

121B

NCA

NCA

121B

121B

NCA

29A

NCA

9

GND

NCA

10

THROTTLE L/O RELAY

INTERIOR LIGHTS SYSTEM (INSTRUMENT ILLUMINATION)

NCA RED

(NOT USED)

WHT

NCA

D439C

BLK

NCA

D439B

3

JAKE BRAKE SWITCH

NCA

NCA

121C

121D

CLUTCH SWITCH

FRONT SOLENOID VALVE

REAR SOLENOID VALVE

205771

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Fig 3: Fuel/Water Separator Circuit

NCA

362

NCA

GND

NCA

196

NCA

196

NCA

NCA

196

362

CIRCUIT BREAKER 5A

NCA

CIRCUIT BREAKER 20A

520

CIRCUIT BREAKER 3A

ELECTRICAL CENTER

HEATER RELAY

NCA

520

NCA

286

NCA

GND

NCA

521

NCA

521A

NCA

INDICATOR INSTRUMENT PANEL

NCA

521A

NCA

521

NCA

196

FUEL/WATER SEPARTATOR MODULE (ON ENGINE SIDE OF BULKHEAD)

WATER SENSOR

286

HEATER ELEMENT

205640

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ENGINE PERFORMANCE For engine performance wiring diagrams, see ENGINE PERFORMANCE WIRING DIAGRAMS article.

EXTERIOR LIGHTS Fig 1: Back­up Lamps Circuit

HOT IN ON OR ACC FUSE A3 10A

POWER DISTRIBUTION MODULE

NCA

NCA 120B BACK­UP LAMP SWITCH

NCA 304

NCA 304

NCA 304 BACK­UP LAMP

NCA

BACK­UP LAMP

NCA

205919

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Fig 2: Exterior Lamps Circuit HOT AT ALL TIMES

HOT AT ALL TIMES

FUSE B9 15A

HOT AT ALL TIMES

FUSE B10 15A

HOT AT ALL TIMES

FUSE B4 15A

HOT AT ALL TIMES

FUSE B7 20A

HOT AT ALL TIMES

FUSE 6 15A

HOT AT ALL TIMES

FUSE 2 20A

HOT AT ALL TIMES

FUSE 7 20A

HOT AT ALL TIMES

FUSE B2 15A

HOT AT ALL TIMES

FUSE 8 20A

POWER DISTRIBUTION MODULE

FUSE BI 15A

NCA 23 NCA 20A

NCA 20

NCA 36

NCA 313

BLU 45

NCA 73

NCA 46A

NCA 29

NCA 23A 23

NCA

NCA 29 TURN SIGNAL FLASHER

NCA

20A

NCA

20

NCA

23F

NCA

20L

NCA

23T

NCA

GND

NCA

23

BRN TRAILER TAIL LAMP RELAY

314

OFF PARK

23A

HEAD

NCA

23A

NCA

23F

NCA

23A

NCA

23D

NCA

23D

NCA

NCA 20L

OFF

NCA

29F

NCA

20R

PARK HEAD

HEADLIGHTS SYSTEM

HEADLAMP SWITCH TRACTOR MARKER LAMP RELAY

NCA NCA

36G NCA

STOP LAMP SWITCH

GND 36G

NCA

GND

NCA

36

NCA

NCA MARKER INTERRUPT SWITCH

NCA

29F

NCA

29

NCA

29A

NCA

29D

NCA

383

NCA

36C

STOP LAMP RELAY 1

WHT

GND

2

BLK

46A

3

YEL

38

4

RED

36B

5

GRN

39

6

BRN

23

7

BLU

45

HEADLIGHTS SYSTEM

PANEL LAMP RELAY

46A

NCA

7 WAY TRAILER CONNECTOR NCA

314

LEFT NCA

NCA

46T

NCA

GND

NCA

46A

BLK

60

38B

NCA

TRAILER MARKER LAMP RELAY

23A NCA 73

LEFT STOP TAIL LAMP

RIGHT NCA

61

29A UTILITY LAMP SWITCH

NCA NCA 61 NCA

39B

NCA

NCA

23A NCA PANEL DIMMER CONTROL MODULE

46

73B

NCA

RIGHT STOP TAIL LAMP

36C

NCA

29A NCA

NCA

NCA

NCA NCA 500

NCA

46

NCA

46

NCA

46

NCA

INTERIOR LIGHTS SYSTEM

NCA INDICATING LAMP

GND

GND

NCA

NCA

CAB MARKER LAMP (7 BULBS)

SIDE CLEAR LAMP

GND

LEFT FRONT TURN & MARKER LAMP

HEADLIGHTS SYSTEM

SIDE CLEAR LAMP

LEFT UTILITY LAMP

RIGHT UTILITY LAMP

46E

NCA

NCA

GND

NCA

NCA

TURN SIGNAL SWITCH

60

GND

222

NCA

GND

NCA

GND

NCA

NCA

DIM

73B

HAZARD

NCA 29A

46F

NCA

NCA

RIGHT FRONT TURN & MARKER LAMP

73B

NCA

NCA

61 ANTI­LOCK BRAKES SYSTEM

NCA INSTRUMENT CLUSTER SYSTEM

61

NCA

60

NCA

NCA

60

205920

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HEADLIGHTS Fig 1: Headlights Circuit, W/ DRL

1

3

309

NCA

309

NCA

380

NCA

GND

NCA

379B

5

NCA

394

NCA

309

4

NCA

2

NCA

POWER DISTRIBUTION MODULE

20

20A

NCA

380

FUSE B10 15A

71

NCA

1

222

NCA

2

20L

NCA

3

22

NCA

4

21

NCA

5 LEFT HEAD LAMP RELAY

ANTI­LOCK BRAKES SYSTEM

PARK BRAKE RELAY

NCA

FUSE B9 15A

NCA

309

28

NCA

NCA J8

HYDRAULIC BRAKE MODULE

FUSE X4 10A

NCA

309

FUSE 3 20A

NCA

309

NCA PARK BRAKE SWITCH (HYDRAULIC)

HOT AT ALL TIMES

FUSE A10 5A

71

NCA

HOT IN IGNITION

FUSE 4 20A

NCA

GND

381

NCA

380

HOT AT ALL TIMES

GND

NCA 22

NCA GND

21

NCA

22

NCA

GND

NCA

PARK BRAKE SWITCH (AIR)

LEFT HEADLAMP

PARK BRAKE RLY DRL IND CTRL HI BEAM CTRL IGN PWR IGN PWR 12V DRL DISABLE 12V

A

NCA

379B

B

NCA

383

C

NCA

222

D

NCA

386

E

NCA

387

F

NCA

380

G

NCA

382

H

NCA

381

NCA

20L

DRL CONTROL MODULE

NCA

85

21B

NCA

D11

GND

NCA

C9

22

86

NCA

GND

30

NCA

28

87

NCA

337 NCA

FOG LAMP RELAY

1

NCA

337

5

NCA

27

222

HIGH BEAM

RIGHT FOG LAMP

RIGHT HEADLAMP RELAY

PARK RIGHT HEADLAMP

HEAD

1

NCA NCA

23F

NCA

EXTERIOR LIGHTS SYSTEM

23F

NCA

20L

NCA

NCA 3

20

NCA 29F

20A

NCA

OFF TURN SIGNAL SWITCH

6

NCA

20R

4

2

21D

22D NCA

NCA

NCA GND

NCA GND

222

NCA

71

NCA 1

222

NCA 4

NCA

27

GND

20R

NCA

NCA

2

GND

NCA

NCA

21D

GND

3

NCA LEFT FOG LAMP

NCA

27

5

NCA

22D

FOG LAMP SWITCH

23D 29F

5

HEAD OFF

PARK

HEADLAMP SWITCH

205908

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Fig 2: Headlights Circuit, W/O DRL HOT IN IGNITION

J8

20A

POWER DISTRIBUTION MODULE

20

FUSE B10 15A

NCA

380

309

FUSE B9 15A

NCA

NCA

28

309

FUSE X4 10A

NCA

309

NCA

NCA

NCA

PARK BRAKE SWITCH (HYDRAULIC)

FUSE 3 20A

71

GND

NCA

NCA

HOT AT ALL TIMES

FUSE A10 5A

HYDRAULIC BRAKE MODULE

2

NCA

309

NCA

309

1

NCA

380

3

NCA

GND

5

NCA

394

NCA

309

71

NCA

1

222

NCA

2

20L

NCA

3

22

NCA

4

21

NCA

5 LEFT HEAD LAMP RELAY

4 INSTRUMENT CLUSTER SYSTEM

PARK BRAKE RELAY

NCA

GND

NCA 22

NCA GND

21

NCA

22

NCA

GND

NCA

PARK BRAKE SWITCH (AIR)

LEFT HEADLAMP

85

NCA

22

86

NCA

GND

30

NCA

28

87

NCA

337

FOG LAMP RELAY

21B

NCA

D11

GND

NCA

C9

NCA

337

5

NCA

27

NCA

27

NCA

GND

NCA

FOG LAMP SWITCH

222

HIGH BEAM 1

RIGHT FOG LAMP

RIGHT HEADLAMP RELAY

PARK RIGHT HEADLAMP

HEAD

1

NCA NCA

23F

NCA

EXTERIOR LIGHTS SYSTEM

23F

NCA

20L

NCA

NCA 3

20

NCA 29F

20A

NCA

OFF TURN SIGNAL SWITCH

6

NCA

20R

4

2

21D

22D NCA

NCA

NCA GND

NCA GND

222

NCA

71

222

NCA

20R

NCA

21D

NCA

22D

NCA 1

27

GND

2

NCA

NCA

3

GND

5

NCA

4

NCA

LEFT FOG LAMP

23D 29F

5

HEAD OFF

PARK

HEADLAMP SWITCH

205909

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HORN Fig 1: Horn Circuit

HOT AT ALL TIMES FUSE 15A

POWER DISTRIBUTION MODULE

NCA 26

NCA 26

NCA 26 HORN

NCA 25

HORN

NCA 25

NCA 25 HORN SWITCH

NCA GND

205993

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INSTRUMENT CLUSTER Fig 1: Instrument Cluster Circuit (1 of 2) C8 NCA

5 BULBS

GND

HOT AT ALL TIMES

C5

FUSE 10A

FUSE 15A

FUSE 5A

D5

FUSE 5A

391

NCA

388

NCA

71

NCA

26

NCA

81C

NCA

D6

339

NCA 396A

NCA

WATER TEMPERATURE GAUGE 1

41

FUEL GAUGE

FUSE 15A

HOT AT ALL TIMES

HOT IN ON OR START

D12

NCA

VOLTMETER

HOT AT ALL TIMES

HOT IN ON OR START

SPEEDOMETER

TACHOMETER

NCA

4

1

NCA

150G

5

2

CONN1

3

NCA

191B

4

NCA

502

5

NCA

81C

391

NCA

6

NCA

183A

388

NCA

7

NCA

137 (OR 516)

8

NCA

29A

71

NCA

390

NCA

396A

NCA

41

NCA

41

NCA

(OPTIONAL) ENGINE HOUR METER

TRANSMISSION OIL TEMPERATURE GAUGE

41

2 3

9

NCA

GND

1

10

NCA

223

NCA

390

NCA

274

NCA

286

2

11

3

12

4 CONN2

13 14

D13

WARNING SYSTEM

STARTING/CHARGING SYSTEM INTERIOR LIGHTS SYSTEM TRANSMISSIONS SYSTEM

TRANSMISSIONS SYSTEM

TRANSMISSION TEMPERATURE IND

ENGINE SHUT DOWN IND D1

DO NOT SHIFT IND

1

NCA

150D

2

NCA

18C

AIR FILTER RESTR IND

C14 WATER IN FUEL IND

3

NCA

34

5

NCA

119

6

NCA

119B

8

NCA

60A

9

NCA

150G

10

NCA

61A

11

NCA

21B

12

NCA

47

13

5

NCA

30

6

7

119

NCA

119B

NCA

191B

NCA

47

NCA

15

NCA

339

16

NCA

394

8 9

EXTERIOR LIGHTS SYSTEM WARNING SYSTEM EXTERIOR LIGHTS SYSTEM HEADLIGHTS SYSTEM

14

C7

30

NCA

183A

NCA

286

NCA

394

NCA

10 11 12 13 14

CONN D

HIGH BEAM IND

C4 LEFT TURN IND

OIL LEVEL IND

D10 D8

C9

117

NCA

81C

4

NCA

118

5

NCA

15

CONN 1 (SPEEDO) 1

NCA

GND

2

NCA

162

3

NCA

81C

4

NCA

163

CONN 2 (TACH & ENGINE HOUR METER, IF EQUIPPED)

RIGHT TURN IND

NCA

WARNING BUZZER

GND

NCA

3

18C

D11

NCA

2

NCA

D2

1

34

NO CHARGE IND

NCA

WATER TEMPERATURE  OIL PRESSURE IND

502

D3

4

WARNING SYSTEM

7

C3

3

4

C6 GLW PLG IND

2

CONN C

C13

C10

1

C1 MB ENGINE LOW OIL LEVEL SWITCH

LOW OIL PRESSURE WARNING SWITCH

WATER TEMPERATURE SWITCH

GND

NCA

GND

NCA

GND

117

NCA

118

NCA

D16 PARKING BRAKE IND

INSTRUMENTATION MODULE

NCA NCA

D15

205902

162

C11

NCA

WATER LEVEL IND 163

BRAKE PRESSURE IND

NCA

D9

30

TACHOMETER SENDER

2 SPEED AXLES RELAY

SPEEDOMETER SENDER

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Fig 2: Instrument Cluster Circuit (2 of 2) ABS BRAKE FLUID PRESSURE DIFFERENTIAL SWITCH

LEFT DOOR SWITCH

ABS SYSTEM RELAY

RIGHT DOOR SWITCH

ABS MOTOR

HYDRAULIC BRAKE BUZZER

NCA 396

NCA 396A

NCA 41

NCA 334

NCA

NCA

334 NCA 334

334 NCA NCA 397

393

389

NCA

391

NCA 334

85

86

NCA

30

NCA

87A

392

392

NCA

398

NCA

NCA

36F

GND

NCA

GND

NCA

NCA

87

41

M

EXTERIOR LIGHTS SYSTEM

EXTERIOR LIGHTS SYSTEM

1 2 3

NCA

396

NCA

E2

397

NCA

F10

389

NCA

N9

398

NCA

36F

NCA

L13 K11

393

NCA

M15

394

NCA

C1

391

390

NCA

D3

NCA

388

388

NCA

B7

NCA

71

NCA

NCA

390

NCA

396A

NCA

41

NCA

41

NCA

119

NCA

119B

309

NCA

J8

395

NCA

H14

GND

NCA

G4 HYDRAULIC BRAKE MODULE

NCA

4

A12

500

7

8 9

395

NCA

GND

NCA BRAKE FLUID INDICATOR SWITCH

18B

NCA

GND

NCA

303

6

NCA

5

SECONDARY LOW AIR PRESSURE SWITCH 10 11 12 13 14

15

NCA

191B

NCA

47

NCA

30

NCA

183A

NCA

286

NCA

394

303

NCA

GND

NCA PRIMARY LOW AIR PRESSURE SWITCH

GND

NCA

309

NCA

HEADLIGHTS SYSTEM

379B

NCA

GND

NCA

380

NCA

71

NCA

309

NCA

309

NCA

5

4

119 NCA

3

309

NCA 119B

GND

NCA

GND

NCA

393

FLAME START MODULE (GLOW PLUG SYSTEM) ABS BRAKE FLUID FLOW SWITCH

NCA

GND

NCA

GND

NCA

FUEL LEVEL SENDER

TRANSMISSION TEMPERATURE SENDER

NCA

47

NCA

30

NCA

GND

NCA 286

NCA WATER IN FUEL SWITCH

NCA

NCA

ENGINE AIR INTAKE FILTER RESTRICTION SWITCH

394 309

NCA 191B

183A

NCA

PARK BRAKE SWITCH (HYDRAULIC)

GND

NCA

1 2 PARK BRAKE RELAY

309

NCA

GND

NCA PARK BRAKE SWITCH (AIR)

205903

WATER TEMPERATURE SENDER

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INTERIOR LIGHTS Fig 1: Courtesy Lamps Circuit HOT AT ALL TIMES FUSE B6 15A

NCA

334

NCA

41

NCA

41 RIGHT DOOR SWITCH

41

NCA

41

NCA

41

NCA

334

NCA LEFT DOOR SWITCH

ANTI LOCK BRAKES SYSTEM

NCA NCA

397

NCA

334

NCA

334

NCA DIODE

334

41 41

NCA

41

NCA

ON OFF

NCA

DOOR

NCA

334

NCA 334 CREW CAB DOME/ READING LAMP

GND

DOOR

NCA 41

OFF ON

NCA RIGHT CAB DOME/ READING LAMP

NCA GND

ON

41

NCA

334

OFF DOOR

LEFT CAB DOME/ READING LAMP

NCA GND

NCA GND

205972

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Fig 2: Instrument Illumination Circuit HOT W/ HEADLAMP SWITCH ENERGIZED

NCA

29A

NCA

PANEL DIMMER CONTROL MODULE

NCA

NCA

NCA

NCA OUTSIDE TEMPERATURE DISPLAY

VOLTMETER

NCA NCA NCA NCA FUEL LEVEL GAUGE

NCA

NCA

NCA

JAKE BRAKE SWITCH

NCA

CRUISE SET/ RESUME SWITCH

NCA

NCA

CRUISE ON/OFF SWITCH

NCA

HEAD­ LAMPS SWITCH

HEATER & A/C SWITCH

NCA

NCA

NCA NCA TACHO­ METER

NCA

NCA

29A

NCA

NCA GEAR POSITION INDICATION

NCA

SPEEDO­ METER

NCA

TRANSMISSION OIL TEMPER­ ATURE GAUGE

NCA

NCA

NCA NCA

NCA

NCA NCA

WATER TEMPER­ ATURE GAUGE

NCA

DIAGNOSTIC SWITCH

205973

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POWER DISTRIBUTION Fig 1: Power Distribution Circuit

ALTERNATOR BATTERY 2

12 VOLT CRANKING MOTOR

BATTERY 3

STARTER RELAY

RUN S

FUEL SOLENOID RELAY

RUN

LOCK

OFF

NCA 343

NCA 331

FUSE 6 15A

NCA 73

FUSE 7 20A

NCA 45

FUSE 8 20A

NCA 46A

FUSE B1 15A

NCA 23A

RUN IGN

FUSE B4 15A

NCA 23

NCA 36

C

TO FUSE A1, 15A (DIAGRAM 1 OF 1)

TO FUSE 5, 10A (DIAGRAM 1 OF 1)

TO ETHER INJECTOR NCA 150R M POWER DISTRIBUTION MODULE

ALARM & SHUTDOWN CONTROL MODULE

FUSE B7 20A

NCA 313

FUSE A7 15A

FUSE A15 40A

NCA 98S

FUSE B5 5A

NCA 98

NCA 98A

B

FUSE B2 15A

TO FUSE B3, 15A (DIAGRAM 1 OF 1)

NCA 29

GLOW PLUG SWITCH FEED "FLAME START" INTAKE AIR HEATER SYSTEM

LOCK OFF

NCA 306

A

STARTING/ CHARGING SYSTEM

FUSE 2 20A

ACC

START

NCA 305

FUSE A9 10A

NCA 15

NCA 166A

FUSE X5 5A

OFF

ACC

NCA 166

NCA 14

FUSE A4 30A

ACC LOCK

START

ACC

START BATTERY POWER STUD BATTERY 1

52

NCA

IGNITION SWITCH

NCA

82

NCA

16

NCA

RED

NCA

NCA

14

82 NCA

RED

NCA NCA

NCA 23

COMPUTER DATA LINES SYSTEM

EXTERIOR LIGHTS SYSTEM

AIR CONDITIONING SYSTEM

NCA 339

INTERIOR LIGHTS SYSTEM

INSTRUMENT CLUSTER SYSTEM

POWER DISTRIBUTION MODULE

FROM FUSE B2, 15A (DIAGRAM 1 OF 1)

B

FUSE B3 15A

FUSE X3

NCA

NCA

FUSE B6 15A

NCA 196

FUSE B9 15A

NCA 312

NCA 41

ENGINE CONTROLS SYSTEM

SOUND SYSTEMS

FUSE B8 10A

NCA TO FUEL/ WATER SEPARATOR RELAY

NCA 302

NCA 57

FUSE 10 20A

FUSE B10 15A

NCA 20A

FUSE 3 20A

NCA 20A

FUSE 4 20A NCA 196 381

NCA 28

HORNS

ABS CB 2 15A

NCA 376A

NCA 376B

TO DRL MODULE

NCA 26

INTERIOR LIGHTS SYSTEM

ABS CB 1 15A

SOUND SYSTEMS

HEADLIGHTS SYSTEM

ANTI­LOCK BRAKES SYSTEM

FROM IGNITION SWITCH (DIAGRAM 1 OF 1)

CIGAR LIGHTER

A NCA 305

NCA GND

FUSE 9 5A

FUSE 20 15A

NCA 362

FUSE A1 15A

NCA 333

FUSE A3 10A

NCA 315

NCA

NCA

NCA 300

FROM IGNITION SWITCH (DIAGRAM 1 OF 1)

AIR BRAKE SYSTEM DRYER

FUEL/ WATER SEPARATOR HEATER

WIPER/WASHER SYSTEM

POWER DISTRIBUTION MODULE

FUSE A5 15A

SOUND SYSTEMS

C

NCA 120B

NCA 80

EXTERIOR LIGHTS SYSTEM (BACK­UP LAMP SWITCH)

MIRRORS SYSTEMS

NCA 177

INSTRUMENT CLUSTER SYSTEM (MIRROR HEATERS) POWER DISTRIBUTION MODULE

NCA 306

FUSE 5 10A NCA 224

FUSE A2 10A NCA 99

FUSE X2

NCA

FUSE A6 10A NCA 81C

FUSE A8 5A NCA 388

206275

ENGINE CONTROLS SYSTEM

INSTRUMENT CLUSTER SYSTEM

FUSE A11

NCA TO ABS HYDRAULIC BRAKE MODULE

2­SPD AXLE SHIFT

FUSE A10 5A

NCA 71

HEAD­ LIGHTS SYSTEM

NCA 363R

NCA 71

FUSE A13 10A NCA 376C

POWER WINDOWS SYSTEM

AIR CONDITIONING SYSTEM

ANTI­LOCK BRAKES SYSTEM ECU

FUSE B14 10A NCA 344 "FLAME START" INTAKE AIR HEATER SYSTEM (ETHER ASSIST)

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FUSE B15 15A

FUSE X1 10A

NCA

NCA 98 (TO MIRROR HEATERS)

NCA 363L

NCA 76

POWER WINDOWS SYSTEM

DEFOGGER SYSTEM

FUSE X4 10A NCA 380 HEADLIGHTS SYSTEM (DRL)

AIR CONDITIONING SYSTEM

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POWER WINDOWS Fig 1: Power Windows Circuit HOT IN ON OR START

HOT IN ON OR START

FUSE 15A

363R

363R

NCA

NCA

363R

DN

M

364 363R

NCA

NCA

365

NCA

NCA

GND

NCA

GND

GND

NCA

29A

NCA

UP

NCA 364L

NCA 365L

NCA GND

NCA GND

NCA 29A

363R

NCA

LEFT DOOR RIGHT WINDOW SWITCH

UP

NCA GND

NCA

DN

363R

LEFT WINDOW SWITCH

NCA

NCA 363L

NCA 363L

NCA 363L

NCA 363R

FUSE 15A

POWER DISTRIBUTION MODULE

RIGHT WINDOW SWITCH

LEFT POWER WINDOW MOTOR

29A

205869

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RIGHT POWER WINDOW MOTOR

364

NCA

365

NCA

NCA

NCA

29A

NCA

UP

GND

PANEL DIMMER CONTROL MODULE

29A

NCA

DN

M

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RADIO Fig 1: Radio Circuit

HOT AT ALL TIMES FUSE B8 10A

HOT IN ON OR ACC FUSE A3 10A

HOT AT ALL TIMES FUSE B3 15A

POWER DISTRIBUTION MODULE CB ANTENNA

NCA 312

NCA 300

NCA 302 NCA NCA NCA 302

NCA NCA

12VDC CONSTANT 12VDC IGN ACCLEAD R SPKR ­ R SPKR + L SPKR ­ L SPKR + 12VDC_GND

NCA

312

NCA

300

NCA

95K

NCA

95A

NCA

95J

NCA

95

CB SHLD PWR GND CB RADIO

95K

NCA

95A

NCA

95J

NCA

95

NCA

RIGHT SPEAKER

NCA

RADIO

LEFT SPEAKER

206245

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STARTING/CHARGING Fig 1: Charging Circuit HOT IN ON OR START

HOT IN ON OR START

FUSE A2 10A

FUSE A6 10A

NCA

99

NCA

81C

NCA

71

NCA

81C

POWER DISTRIBUTION MODULE

RED RED

RED

RED BATTERY 1

BATTERY 2

BATTERY 3

C5 INSTRUMENTATION MODULE CHARGE IND

BLK BLK

BLK C7 NCA GND NCA

137

POWER DISTRIBUTION SYSTEM

DIODE

16

82

14

STARTING CIRCUIT

16

NCA

71

NCA

137

NCA

RED

RED

NCA

NCA

CRANKING MOTOR

ALTERNATOR

206268

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Fig 2: Starting Circuit

HOT AT ALL TIMES IGNITION KEYSWITCH

START

ACC OFF

ON

GND NCA NCA

RED

RED

NCA

82

NCA

15A 15

NCA

82

NCA

74

NCA ESSEX MAGNETIC SWITCH

74 NCA

BATTERY 1

BLK

GND

BATT+

START

GND

M CRANKING MOTOR

GND

15

NCA

15A

NCA PUSHBUTTON START SWITCH

206267

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TRANSMISSION Fig 1: Transmission Circuit, Except WTEC­III (1 of 2) HOT AT ALL TIMES

HOT IN ON OR START

POWER BREAKER 15A

HOT IN IGNITION

FUSE 10A

E146

NCA

E146

NCA

NCA

81C

2B E136

1B NCA

POWER DISTRIBUTION MODULE

IGNITION BREAKER 15A

SHIFT CONTROL

1

NCA

E135

2

NCA

E136

3

NCA

E137

4

NCA

E138

5

NCA

E139

6

NCA

E140

7

NCA

E141

8

NCA

E142

9

NCA

E143

10

NCA

E144/GND

11

NCA

E136

12

NCA

E146

E135

NCA

13

NCA

E147

E118

NCA

14

NCA

E148

E119

NCA

15

NCA

E149

E112

NCA

16

NCA

E150

17

NCA

E151

18

NCA

E143

19

NCA

E153

20

NCA

E154

21

NCA

E155

22

NCA

E156

23

NCA

E157

24

NCA

E158

26

NCA

E160

27

NCA

E161

28

NCA

29

NCA

COMPUTER DATA LINES SYSTEM

NCA

COMPUTER DATA LINES SYSTEM

E136

NCA

1

NCA

E143 E160

NCA

7

NCA

NCA

5

NCA

E168

NCA

4

NCA

E108

NCA

6

NCA

E143

NCA

GND

ANTI­LOCK BRAKES SYSTEM

NCA NCA

E153

NCA

E138

NCA

E155

NCA

E137

NCA NCA

E139

NCA

E148

NCA

E161

NCA

E162

E150

NCA

E163

E163

NCA

E162

NCA

E165

NCA

E117

NCA

E105

INSTRUMENT CLUSTER SYSTEM INTERIOR LIGHTS SYSTEM

30 NCA

NCA

E123

(OR 274)

25

31

E132 E146

E165

32 33 34

NCA

E168

2

NCA

E102

E102

NCA

3

NCA

E103

E103

NCA

4

NCA

E104

E104

NCA

5

NCA

E105

6

NCA

E106

E106

NCA

7

NCA

E107

E107

NCA

8

NCA

E108

E131

NCA

9

NCA

E109

E120

NCA

10

NCA

E110

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

M34B 1

(OR 274)

11 12

NCA

E112

13

NCA

E113

14

NCA

E114

15

(OR 223)

E110

NCA

E147

NCA

E156

NCA

E114

NCA

NCA

E115

17

NCA

E117

E141

NCA

E140

NCA

E149

NCA

18

NCA

E118

19

NCA

E119

20

NCA

E120

21

NCA

E121

22

NCA

E122

(OR 223)

NCA

E121

NCA

E122

NCA

23

NCA

E123

24

NCA

E124

E124

NCA

25

NCA

E125

E125

NCA

27

NCA

E127

E127

NCA

28

NCA

E128

E128

NCA

29

NCA

E129

E129

NCA

30

NCA

E130

E130

NCA

31

NCA

E131

32

NCA

E132

NCA

E134

16

E115

26

RETARDER SOLENOID 206242

DASH CLUSTER

NEUTRAL/START RELAY

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26 27 28 29 30 31 32 33 34

35 36 37 38 39 40 41 42 43

NCA

120B NCA

NCA 304 (OR 120)

120B NCA

87

120B NCA 86

30

E113 NCA 85

15 NCA 87

NCA

15E

E123

GND

NCA

NCA

E123 NCA 86

30

GND NCA

(OR 274) 81C

C5 SUMP TEMP IND LT (OPT)

DO NOT SHIFT IND LT

NCA

NCA

E105

NCA C13

24 25

POWER DISTRIBUTION SYSTEM

STARTING/CHARGING SYSTEM

85

C10

E115 (OR 223)

NCA

E109

NCA B

NCA

(OR 274) A

E134

NCA

M34A

E115 (OR 223)

34 WT TRANSMISSION ECU

E105

33

21 22 23

EXTERIOR LIGHTS SYSTEM

BACKUP LAMP RELAY

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Fig 2: Transmission Circuit, Except WTEC­III (2 of 2)

31 32 33 34

35 36 37 38 39 40 41 42 43

E137

E137

NCA

NCA

E105

(OR 274)

NCA

NCA

E139

E161

NCA

NCA

E148

E163

NCA

(OR 223)

NCA

E117

NCA

(OR 274)

E105

E115 NCA

E161

NCA

E150

NCA

E163

NCA

E162

NCA

E165

NCA

E117

NCA

A

NCA

NCA

B

NCA

E104

NCA

C

NCA

E106

NCA

D

NCA

E107

NCA

E

NCA

E110

NCA

F

NCA

E102

E120

NCA

G

NCA

NCA

E103

E121

NCA

H

NCA

NCA

E104

I

NCA

E128

NCA

J

NCA

NCA

E106

E129

NCA

K

NCA

NCA

E107

E130

NCA

L

NCA

NCA

E131

E131

NCA M

NCA

NCA

E120

E135

NCA

N

NCA

NCA

E110

O

NCA

NCA

E147

P

NCA

NCA

E156

Q

NCA

R

NCA

E147

NCA

NCA

E114

S

NCA

NCA

E141

T

NCA

NCA

E140

E140

NCA

U

NCA

NCA

E149

E149

NCA

V

NCA

E161

NCA W

NCA

E162

NCA

X

NCA

E165

NCA

Y

NCA

Z

NCA

NCA

E115

NCA

E121

NCA

E122

NCA

E124

NCA

E125

NCA

E127

NCA

E128

NCA

E129

NCA

E130

(OR 223)

WT TRANSMISSION ELECTRONICS

A

B

B

A

A

B

A

B

A

B

A

B

C

RETARDER ACCUMULATOR SOLENOID VALVE 206243

E102 E103

NCA

E124

30

NCA

NCA

E156

29

E125

NCA

28

E155

E135

26 27

NCA

NCA

NCA

24 25

E155

NCA

23

E138

E135

22

NCA

NCA

NCA

21

E153

E138

20

E153

NCA

19

NCA

NCA

E149

17 18

E123

NCA

16

E123

E140

15

NCA

NCA

NCA

14

E146

E150

13

E146

NCA

12

NCA

NCA

E141

11

NCA

E132

NCA

10

E112

E132

E139

9

E112

NCA

NCA

8

NCA

NCA

E148

7

NCA

E119

NCA

6

NCA

E118

E119

E122

5

E114

E118

NCA

NCA

4

E135

NCA

E127

3

NCA

NCA

1 2

16­PIN VIW OPT MATING CONNECTOR 1 O/P (­) 2 I/P (+) 3 I/P (+) 4 O/P (+) 5 O/P (­) 6 ING +12V 7 NEUT SIG (+) 8 I/P (­) 9 I/P (­) 10 RTRDR IND (­) 11 SRVC BRK (­) 12 O/P (­) 13 SIG GND 14 RTRDR ENBL (­) 15 DNS LT (­) 16 IP (­)

OUTPUT SPEED SENSOR

ENGINE SPEED SENSOR

TURBINE SPEED SENSOR (HD SRS)

RETARDER TEMPERATURE SENSOR

THROTTLE POSITION SENSOR (MECH ENGINES)

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Fig 3: Transmission Circuit, WTEC­III (1 of 2) HOT AT ALL TIMES

HOT IN ON OR START

HOT IN ON OR START

TRANS PWR FUSE 10A

POWER DISTRIBUTION MODULE

TRANS IGN BREAKER 10A

FUSE 10A

120B

NCA

E IGN RUN MATING CONNECTOR CC1

BAT POS GP OP­1 GP OP­2 REVERSE SIG GP OP­8 NEUT SIG SNSR PWR

1

NCA

E136

2

NCA

E114

3

NCA

E132

4

NCA

E113

5

NCA

E167

6

NCA

E123

NCA

E124

11

NCA

E155

12

NCA

E153

13

NCA

E118

EXTERIOR LIGHTS  SYSTEM

E146

NCA

E146

NCA

81C

NCA

E136

NCA

IB

GP IP­2 GP IP­3

BAT GND GP OP­4 GP OP­5 MPH SIG 0­12V GP OP­3

120B

NCA

120B

NCA

87

30

120B

NCA

85

E113

NCA

86

STARTING/CHARGING SYSTEM

15

NCA

87

POWER DISTRIBUTION SYSTEM

15E

NCA

30

E123

NCA

85

GND

NCA

86

GND

NCA

BACKUP LAMP RELAY

7 8 9

14 15

BAT POS

NCA

87A

10 GP IP­1

E304

16

NCA

E136

17

NCA

E143

18

NCA

E125

19

NCA

E105

20

NCA

E157

NCA

E112

NCA

INSTRUMENT CLUSTER SYSTEM

21 22

NEUTRAL/ START RELAY

E143/GND

RETARDER CONTROLLER E124

NCA

C

23

E135

NCA

A

24

E164

NCA

B

25 IGN SIG OP IP­5 ABS GP IP­7 GP IP­8 DIGITAL GND BAT GND E142 J1587+ SNSR PWR IGN SIG PRI SHFT DB­1 PRI SHFT DB­2 PRI SHFT DB­4 PRI SHFT DB­8 PRI SHF PAR SHFT SEL MODE GP IP­4

26

NCA

E146

27

NCA

E154

E154

NCA

30

29

NCA

E137

E161

NCA

87

30

NCA

E117

31

NCA

E161

32

NCA

E143

28

NCA

CONNECTOR ''V" (GRAY) 1 NCA

ABS RETARDER RELAY

E143/GND

J1587+T

J1587+T

NCA

A

J1587­T

NCA

B

2 3

NCA

E124

4

NCA

E146

GND

NCA

B

5

NCA

E170

E146

NCA

A

6

NCA

E171

E167

NCA

C

7

NCA

E172

E167

NCA

8

NCA

E173

E166

NCA

9

NCA

E174

E161

NCA

E

10

NCA

E175

E161

NCA

F

11

NCA

E119

14

NCA

E180

E114

NCA

15

NCA

E176

E118

NCA

2

16

NCA

E136

E119

NCA

3

17

NCA

J1587­T

E112

NCA

4

18

NCA

E166

E132

NCA

5

19

NCA

E135

E146

NCA

6

20

NCA

E164

E161

NCA

7

E153

NCA

8

E155

NCA

9

E125

NCA

10

E137

NCA

11

E169

NCA

12

E161

NCA

13

28

E163

NCA

14

29

E167

NCA

15

E117

NCA

16

D

DATA LINK HARNESS CONNECTOR

GND (V) IGN SIG OP­8 (­) (OP SPD­A: V) OP­7 RNG IND SIG GND SIG GND

6­PIN VIM OPT MATING CONNECTOR

12 13

SHFT SEL DSPL GP OP­6 BAT POS E151 J1587­ GP OP­7 ANALOG GND RTDR MDL TN SIG

21 22

ENGINE CONTROLS SYSTEM

23 24 25

30

NCA

E157

31

NCA

E115

32

NCA

E161

GND

NCA

E173

E172

E171

E170

E124

E186

E188

NCA

NCA

NCA

NCA

NCA

NCA

NCA

NCA

E

D

C

B

A

N

T

V

U

S M

SHIFT CONTROL DASH CLUSTER

OP­1 (­) (RNG IND NEUT V) IP­3 (+) (PTO RQST) IP­4 (+) (E­BRK RQST) OP­3 (+) (PTO ENABL: V) OP­2 (­) (E­BRK ENBL) IGN 12V + SIG GND IP­2 (­) (AUX) IP­1 (­) (AUX) OP­4 (­) (RTDR IND) IP­7 (­) (BRAKE START) IP 12 (­) (E­BRK RQST­2) SIG GND IP­6 (­) (RTDR RQST) OP­8 (­) (OP SPD­A) IP­8 (­) (AUTO NEUT)

16­PIN VIW MATING CONNECTOR

(OR 29A)

NCA

E174

L

E175

E180

R

NCA

E176

NCA

P

NCA

E136

NCA

C5 TRANS TEMP IND LT (OPT)

NCA

C13

E143

C10

NCA

E187

CONNECTOR ''S" (BLACK)

CHK TRANS (DNS) IND LT 206240

NCA

E143

NCA

WTEC­III TRANSMISSION ECU

E163

81C

BAT GND

NCA

NCA

CHK TRANS LT­

27

E105 (OR 274)

MPH SIG 0­12V

E169

E115 (OR 223)

GP IP­6

NCA

NCA

GP IP­12

26

1

PANEL LIGHTS

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Fig 4: Transmission Circuit, WTEC­III (2 of 2)

NCA

A

NCA

E102

NCA

B

NCA

E103

NCA

C

NCA

E104

NCA

D

NCA

E124

E102

NCA

NCA

E

NCA

E107

E121

NCA

2

NCA

F

NCA

E110

E107

NCA

3

NCA

G

NCA

E120

E120

NCA

4

NCA

H

NCA

E121

E103

NCA

5

NCA

J

NCA

E128

E129

NCA

6

NCA

K

NCA

E129

E104

NCA

7

NCA

L

NCA

E130

NCA

M

NCA

E131

E124

NCA

9

NCA

N

NCA

E135

E156

NCA

10

NCA

P

NCA

E147

NCA

U

NCA

E140

E162

NCA

12

NCA

V

NCA

E149

E195

NCA

13

NCA

W

NCA

E195

E141

NCA

14

NCA

X

NCA

E162

E149

NCA

15

NCA

Y

NCA

E165

E139

NCA

16

E130

NCA

17

B

F­SOL+ C­SOL­ E­SOL­ G­SOL­ SNSR PWR

NCA NCA

E124

NCA

NCA

NCA

19

E128

NCA

20

TRANS ID ENGINE SPD SNSR+ T­SPEED SNSR+ OP SPD SNSR+ C,G SOL+

E156 E135

NCA

21

NCA

22

E127

NCA

23

E101

NCA

24

E135

NCA

25

E165

NCA

26

E147

NCA

27

E138

NCA

28

B­SOL­ D­SOL­ F­SOL­ H­SOL LOW N­SOL­ ANLOG GND OIL LVL SUMP TEMP IN RTDR TEMP IN

29 E150

NCA

30

E140

NCA

31

E148

NCA

32

CONNECTOR "T" (BLUE)

E135

H­N SOL SUPPLY

E131 E110

E124

THRTL POS SNSR C3 PRESS

18

NCA A

B,E SOL+

11

E116

A,D,J SOL+

A­SOL­

8

WT TRANSMISSION ELECTRONICS

C

1

ENGINE SPD SNSR­ T­SPD SNSR­ OP SPD SNSR­ WTEC­III TRANSMISSION ECU

THROTTLE POSITION SENSOR (TPS) (MECH ENGINE)

A

NCA

E141

B

NCA

E150

E138

NCA

A

E135

NCA

B

ENGINE SPEED SENSOR (ESS)

RETARDER TEMPERATURE SENSOR (RTS) A

NCA

E149

B

NCA

E140

NCA

E149

TURBINE SPEED SENSOR (TSS) (HD)

B

NCA

E116

A

NCA

E127

A

NCA

E139

B

NCA

E148

E101

NCA

A

E116

NCA

B RETARDER ACCUMULATOR SOLENOID (RAS) VALVE

RETARDER SOLENOID (RS)

OUTPUT SPEED SENSOR (OSS)

206241

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For additional transmission wiring diagrams, see TRANSMISSION WIRING DIAGRAMS article.

WARNING SYSTEMS Fig 1: Buzzer Circuit HOT IN ON OR START

HOT IN ON OR ACC

FUSE 10A

NCA

NCA

81C

NCA

81C

81C

FUSE 15A

NCA

POWER DISTRIBUTION MODULE

177

173

NCA

LOW COOLANT LEVEL PROBE

LOW OIL PRESSURE/HIGH COOLANT TEMPERATURE LIGHT

NCA

NCA

173

NCA

177

NCA

150G

NCA

NCA LOW COOLANT LEVEL MODULE

WARNING BUZZER

NCA

34

NCA

18C

DIODE 205962

DIODE

NCA

NCA

NCA

NCA

NCA

HIGH COOLANT TEMPERATURE SWITCH

NCA 150G

LOW OIL PRESSURE SWITCH

LOW COOLANT LEVEL LIGHT

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Fig 2: EDM Circuit HOT IN ON OR START

IGN

A

NCA

306

D

NCA

1587+

E

NCA

1587­

F

NCA

GND

NCA

119

C

NCA

18C

D

NCA

34

306

NCA

FUSE

B C

J1587+ J1587­ GROUND WATER TEMP WATER LP OIL LP

COMPUTER DATA LINES SYSTEM GAUGE

40B A

119

NCA

D5

18C

NCA

D2

34

NCA

D3

B

E 40A

EDM

WATER/OIL IND INSTRUMENT CLUSTER

85

NCA

18C

86

NCA

306

30

NCA

18C

87A

NCA

GND

87A

NCA

GND

30

NCA

34

85

NCA

34

86

NCA

306

NCA

GND

87 COOLANT TEMPERATURE RELAY 87

OIL PRESSURE RELAY 205963

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Fig 3: Kysor Circuit HOT IN ON OR START

NCA

NCA

FUSE 10A

150Q

FUSE 10A

POWER DISTRIBUTION MODULE

81C

HOT IN ON OR START

87

NCA

150Q

NCA

373

87A

150D

NCA

30

373

NCA

85

NCA

86

NCA

R

NCA

ENGINE SHUTDOWN INDICATOR RELAY

Q P

373

NCA

85

O

FUEL SOLENOID RELAY

N

NCA

M

NCA

150R

L

NCA

325

K

NCA

324

J

NCA

173

G

NCA

150G

F

NCA

34

E

NCA

18C

STARTING/ CHARGING SYSTEM 325

NCA

OIL PRESSURE SHUTDOWN SWITCH

I H 324

NCA

ALARM STAT SWITCH

D C

NCA

B

NCA

18C

A

NCA

34

NCA

34

173

NCA

COOLANT LEVEL SWITCH

ALARM & SHUTDOWN CONTROL MODULE

150D

LOW OIL PRESSURE SWITCH

NCA

NCA ENGINE SHUTDOWN INDICATOR NCA

18C

HIGH COOLANT TEMPERATURE SWITCH

NCA

NCA

18C

DIODE

DIODE

81C

81C

150G

NCA

NCA

NCA

NCA

NCA

NCA

NCA

NCA

HIGH COOLANT TEMPERATURE/ LOW OIL PRESSURE INDICATOR LIGHT

WARNING BUZZER

205961

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LOW COOLANT LEVEL LIGHT

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WIPER/WASHER Fig 1: Wiper/Washer Circuit, W/ Intermittent Wipers HOT IN ON OR ACC POWER DISTRIBUTION MODULE LOW SPEED RELAY

L 12V ILL W GND

NCA

315B

NCA

315A

NCA

315

NCA

29A

NCA

320

AD5 315

NCA

85

NCA

86

AE6

87

315H

NCA NCA

NCA

87A

NE6

30

NCA 315B

85

315A

NCA 315L H

86

AD6

87

315P

87A

30

NB6

CIRCUIT BREAKER 15A

HIGH SPEED RELAY

INTERIOR LIGHTS SYSTEM

NCA

LH­A9

INSTRUMENTATION CONTROL SWITCH

NCA

205947

NCA

NCA GND

315C

NCA

12V

315H

NCA

HIGH

315P

NCA

BLUE

315L

NCA WASHER PUMP

LOW

M

320

NCA

NCA

NCA 320A

WIPER SWITCH

WASHER LEVEL SENSOR

WIPER MOTOR

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Fig 2: Wiper/Washer Circuit, W/O Intermittent Wipers HOT IN RUN OR ACC

POWER DISTRIBUTION MODULE

10 9

NCA NCA

315

NCA

FUSE 15A

GND 29A

5

NCA

315

7

NCA

320

GND

NCA

318

NCA

316

NCA

317

NCA

319

NCA

INTERIOR LIGHTS SYSTEM

M

9

NCA GND

NCA 316

1

10 NCA GND

3

NCA 29A

7

NCA GND

5

NCA 318

GND

WASHER MOTOR

315

NCA

M

NCA

320

INTERIOR LIGHTS SYSTEM

NCA 317

NCA

WIPER MOTOR 315

NCA

WASHER SWITCH

WIPER SWITCH 205953

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