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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
205824
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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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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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