GMC Forward Control P3500 (1985-1999) dk blu Wiring diagrams

1-3 FUSE 9 A/T ISS HIGH A/T ISS LOW AUTOMATIC TRANSMISSION SHAFT SPEED SENSOR (A/T ISS) (LEFT SIDE OF TRANSMISSION) BLK WIRE BLK/WHT WIRE BLU/WHT WIRE BRN WIRE CRUISE CONTROL MODULE (ON LEFT RADIATOR SUPPORT BRACKET) CRUISE CONTROL SWITCH CRUISE ENGAGED IN VSS INPUT DK BLU WIRE DK GRN/WHT WIRE GRY WIRE GRY/BLK WIRE HAZARD LAMPS FLASHER (LEFT OF STEERING COLUMN) HOT AT ALL TIMES HOT IN RUN I/P FUSE BLOCK LT BLU WIRE LT BLU/BLK WIRE NCA WIRE OFF ORG/ WIRE PPL R/A RED/BLK WIRE RESISTOR (ENGINE HARNESS, 7 CM FROM BREAKOUT TO ENGINE COOLANT FAN MOTOR CONN) S/C STOP/HAZ FUSE 1 STOPLAMPS SWITCH (ABOVE BRAKE PEDAL) TORQUE CONVERTER CLUTCH, STOPLAMPS SWITCH (ABOVE BRAKE PEDAL) VEHICLE CONTROL MODULE (VCM) (ON LEFT RADIATOR SUPPORT BRACKET) VSS OUTPUT CRUISE ENGAGED

1-3 FUSE 9 A/T ISS HIGH A/T ISS LOW AUTOMATIC TRANSMISSION SHAFT SPEED SENSOR (A/T ISS) (LEFT SIDE OF TRANSMISSION) BLK WIRE BLK/WHT WIRE BLU/WHT WIRE BRN WIRE CRUISE CONTROL MODULE (ON LEFT RADIATOR SUPPORT BRACKET) CRUISE CONTROL SWITCH CRUISE ENGAGED IN VSS INPUT DK BLU WIRE DK GRN/WHT WIRE GRY WIRE GRY/BLK WIRE HAZARD LAMPS FLASHER (LEFT OF STEERING COLUMN) HOT AT ALL TIMES HOT IN RUN I/P FUSE BLOCK LT BLU WIRE LT BLU/BLK WIRE NCA WIRE OFF ORG/ WIRE PPL R/A RED/BLK WIRE RESISTOR (ENGINE HARNESS, 7 CM FROM BREAKOUT TO ENGINE COOLANT FAN MOTOR CONN) S/C STOP/HAZ FUSE 1 STOPLAMPS SWITCH (ABOVE BRAKE PEDAL) TORQUE CONVERTER CLUTCH, STOPLAMPS SWITCH (ABOVE BRAKE PEDAL) VEHICLE CONTROL MODULE (VCM) (ON LEFT RADIATOR SUPPORT BRACKET) VSS OUTPUT CRUISE ENGAGED

1-3 FUSE 9 A/T ISS HIGH A/T ISS LOW AUTOMATIC TRANSMISSION SHAFT SPEED SENSOR (A/T ISS) (LEFT SIDE OF TRANSMISSION) BLU/WHT WIRE BRN WIRE CRUISE CONTROL SWITCH DK BLU WIRE GRY WIRE GRY/BLK WIRE HAZARD LAMPS FLASHER (LEFT OF STEERING COLUMN) HOT AT ALL TIMES HOT IN RUN I/P FUSE BLOCK LT BLU WIRE NCA WIRE OFF ORG/ WIRE POWERTRAIN CONTROL MODULE (PCM) (ON LEFT SIDE OF DRIVER'S ISLAND) PPL PPL TCC/STOP SW SIG STOPLAMP SW SIGNAL CRUISE ON/OFF INPUT SET/COAST INPUT R/A RED/BLK WIRE RESUME/ACCEL INPUT S/C STOP/HAZ FUSE 1 STOPLAMPS SWITCH (ABOVE BRAKE PEDAL) TORQUE CONVERTER CLUTCH, STOPLAMPS SWITCH (ABOVE BRAKE PEDAL)

1-3 FUSE 9 A/T ISS HIGH A/T ISS LOW AUTOMATIC TRANSMISSION SHAFT SPEED SENSOR (A/T ISS) (LEFT SIDE OF TRANSMISSION) BLU/WHT WIRE BRN WIRE CRUISE CONTROL SWITCH DK BLU WIRE GRY WIRE GRY/BLK WIRE HAZARD LAMPS FLASHER (LEFT OF STEERING COLUMN) HOT AT ALL TIMES HOT IN RUN I/P FUSE BLOCK LT BLU WIRE NCA WIRE OFF ORG/ WIRE POWERTRAIN CONTROL MODULE (PCM) (ON LEFT SIDE OF DRIVER'S ISLAND) PPL PPL TCC/STOP SW SIG STOPLAMP SW SIGNAL CRUISE ON/OFF INPUT SET/COAST INPUT R/A RED/BLK WIRE RESUME/ACCEL INPUT S/C STOP/HAZ FUSE 1 STOPLAMPS SWITCH (ABOVE BRAKE PEDAL) TORQUE CONVERTER CLUTCH, STOPLAMPS SWITCH (ABOVE BRAKE PEDAL)

1-2 SHIFT SOL 1-2 SHIFT SOLENOID 2-3 SHIFT SOL 2-3 SHIFT SOLENOID 3-2 SHIFT SOL 3-2 SHIFT SOLENOID A/C COMPRESSOR RELAY, GENERATOR PNK WIRE A/T INPUT SPEED SENSOR (LEFT SIDE OF TRANSMISSION) A/T ISS SENS HI IN A/T ISS SENS LO IN APP 1 SIGNAL IN APP 2 SIGNAL IN APP 3 SIGNAL IN AUTOMATIC TRANSMISSION BATTERY IN BLK WIRE BLK/WHT WIRE BRAKE SWITCH IN BRN WIRE BRN/WHT WIRE BUSS BAR CLASS II DATA DATA LINK CONNECTOR (PARTIAL) (BELOW DASH, NEAR STEERING COLUMN) DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ECM 1 FUSE 12 ECM-BAT FUSE 6 ECT SENSOR IN ELECTRONIC BRAKE CONTROL MODULE ENGINE COOLANT TEMPERATURE SENSOR (TOP FRONT OF ENGINE) FUEL PUMP RELAY, ENGINE OIL PRESSURE INDICATOR SENSOR GAUGES FUSE 8 GRY WIRE HAZARD LAMPS FLASHER (ABOVE STEERING COLUMN) HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START I-3 FUSE 9 I/P FUSE BLOCK IGNITION IN INSTRUMENT CLUSTER LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MIL CONTROL ORG/ WIRE PCM GROUND PCS SOL HI OUT PCS SOL LO OUT PNK WIRE POWERTRAIN CONTROL MODULE (LEFT SIDE OF DRIVER'S ISLAND) PPL PPL/WHT WIRE PRESS CTRL SOLENOID RED WIRE RED/BLK WIRE SENSOR GROUND SERVICE ENGINE SOON INDICATOR STOP-HAZ FUSE 11 STOPLAMP SWITCH IN TFT SENSOR IN TORQUE CONVERTER CLUTCH, STOPLAMP SWITCH TRANS FLUID TEMP SENSOR TRANS RANGE "A" TRANS RANGE "B" TRANS RANGE "C" TRANS RANGE PRESSURE SWITCH ASSEMBLY TRANSMISSION FUSE 17 TWISTED WIRE PAIR VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VEHICLE SPEED SENSOR BUFFER VEHICLE SPEED SENSOR BUFFER (ABOVE ACCELERATOR PEDAL) VSS HI IN VSS LO IN VSS OUT YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOL 1223 1222 2-3 SHIFT SOL CTRL 1-2 SHIFT SOL CTRL DIAGNOSTIC TEST 1227 433 TRANS FLUID TEMP SIG BARO SENSOR INPUT 9 6 DATA LINK CONNECTOR (PARTIAL) (BELOW DASH, NEAR STEERING COLUMN) A/T INPUT SPEED SENSOR (LEFT FRONT SIDE OF TRANSMISSION) AUTOMATIC TRANSMISSION BAROMETRIC PRESSURE SENSOR (TOP LEFT REAR OF INTAKE MANIFOLD) BATTERY FEED BLK WIRE BLK/WHT WIRE BRN WIRE DK BLU WIRE DK BLU/WHT WIRE DRL MODULE, DRL RELAY, GENERATOR ECM 1 FUSE 12 ECM-BAT FUSE 6 ELECTRONIC BRAKE CONTROL MODULE ENGINE OIL PRESSURE INDICATOR SENSOR, FUEL PUMP RELAY ENGINE SPEED SENSOR (IN FUEL INJECTION PUMP) ENGINE SPEED SIGNAL SENSOR GROUND TP SENSOR INPUT FUEL INJECTION PUMP SHUTOFF SOLENOID,, FUEL PUMP RELAY GAUGES FUSE 8 GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN HOT IN RUN OR START I-3 FUSE 9 I/P FUSE BLOCK IGN BUSS INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE ORG/ WIRE OUT PCS HI PCS LO IGNITION PNK WIRE PNK RANGE SIGNAL A RANGE SIGNAL B RANGE SIGNAL C WIRE PNK WIRE PPL PPL BRAKE SIGNAL TCC PWM CONTROL PPL/WHT WIRE PRESSURE CONTROL SOLENOID RANGE MODE SELECTOR RED WIRE RED/BLK WIRE RUN WIRE SERVICE TRANS OUTPUT SERIAL DATA SERVICE TRANSMISSION INDICATOR STOP LAMPS, TORQUE CONVERTER BRAKE SWITCH SYSTEM GROUND SYSTEM GROUND 452 416 SENSOR GROUND 5 VOLTS REF TAN WIRE TCC PWM SOL 2-3 SHIFT SOL THROTTLE POSITION SENSOR (ON FUEL INJECTION PUMP) TRANS FUSE 17 TRANSMISSION CONTROL MODULE (LEFT INTERIOR FIREWALL) TRANSMISSION TEMPERATURE SENSOR VEHICLE SPEED INPUT INPUT SPEED SENS LO INPUT SPEED SENS HI VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VEHICLE SPEED SENSOR BUFFER VEHICLE SPD OUTPUT VSS INPUTS WHT WIRE WHT/BLK WIRE YEL/BLK WIRE

1-3 FUSE 9 A/T ISS HIGH A/T ISS LOW AUTOMATIC TRANSMISSION SHAFT SPEED SENSOR (A/T ISS) (LEFT SIDE OF TRANSMISSION) BLK WIRE BLK/WHT WIRE BLU/WHT WIRE BRN WIRE CRUISE CONTROL MODULE (ON LEFT RADIATOR SUPPORT BRACKET) CRUISE CONTROL SWITCH CRUISE ENGAGED IN VSS INPUT DK BLU WIRE DK GRN/WHT WIRE GRY WIRE GRY/BLK WIRE HAZARD LAMPS FLASHER (LEFT OF STEERING COLUMN) HOT AT ALL TIMES HOT IN RUN I/P FUSE BLOCK LT BLU WIRE LT BLU/BLK WIRE NCA WIRE OFF ORG/ WIRE PPL R/A RED/BLK WIRE RESISTOR (ENGINE HARNESS, 7 CM FROM BREAKOUT TO ENGINE COOLANT FAN MOTOR CONN) S/C STOP/HAZ FUSE 1 STOPLAMPS SWITCH (ABOVE BRAKE PEDAL) TORQUE CONVERTER CLUTCH, STOPLAMPS SWITCH (ABOVE BRAKE PEDAL) VEHICLE CONTROL MODULE (VCM) (ON LEFT RADIATOR SUPPORT BRACKET) VSS OUTPUT CRUISE ENGAGED

7.4L BACKUP LAMPS CIRCUIT BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE COOLING FAN NOTOR HARN BREAKOUT) CRUISE CONTROL SYSTEM DK BLU WIRE DK GRN WIRE ENGINE CONTROLS SYSTEM GRN WIRE HAZARD HAZARD LAMPS FLASHER (INNER LEFT SIDE OF MAIN SUPPORT BRACKET) HEAD OFF HEADLAMP BREAKOUT) HEADLAMP SWITCH CONNECTOR) HEADLAMPS SWITCH HOT AT ALL TIMES HOT IN I/P FUSE BLOCK INSTRUMENT CLUSTER RIGHT TURN INDIC INTERIOR LAMPS SYSTEM LEFT FRONT PARK, TURN SIGNAL (T/S) LAMP LEFT FRONT SIDE MARKER LAMP LEFT HEAD- LAMP BREAKOUT) LEFT HEADLAMP BREAKOUT) LEFT REAR SIDE MARKER LAMP LEFT TURN INDIC LT BLU WIRE NCA WIRE NORMAL ORG/ WIRE PARK PARK TURN PPL PROVISION FOR CENTER HIGH MOUNTED STOP LAMP PROVISIONS FOR LEFT TAIL, STOP, TURN SIGNAL (T/S) LAMPS PROVISIONS FOR MARKER LAMPS PROVISIONS FOR RIGHT TAIL, STOP, TURN SIGNAL (T/S) LAMPS RIGHT FRONT PARK, TURN SIGNAL (T/S) LAMP RIGHT FRONT SIDE MARKER LAMP RIGHT REAR SIDE MARKER LAMP RIGHT REAR LICENSE LAMP LEFT REAR LICENSE LAMP RUN WIRE STOP-HAZ FUSE 11 TAIL LAMPS FUSE 7 TORQUE CONVERTER CLUTCH, STOP LAMPS SWITCH (BRAKE PEDAL SUPPORT BRACKET) TURN TURN B/U FUSE 5 TURN LEFT TURN RIGHT TURN SIGNAL FLASHER TURN SIGNAL SWITCH WHT WIRE WINDSHIELD WIPER MOTOR BREAKOUT) YEL WIRE

2-3 SHIFT SOL CTRL ANTI-LOCK BRAKE SYSTEM BLK WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE CAM POSIT SENS RTN FUEL LEV PPL CAMSHAFT POSITION (CMP) SENSOR (INTERNAL TO DISTRIBUTOR) CKP DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE GRY WIRE HALL EFFECT SENSOR IGN FEED KNOCK SENS SIG KNOCK SENSOR (KS) (TOP CENTER REAR OF ENGINE) LT BLU WIRE LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE NCA WIRE PNK PNK PNK 2 3 4 WIRE PNK WIRE PNK/BLK WIRE PPL PPL CKP SENS RTN VSS RTN VSS SIG PPL/WHT WIRE PURGE VENT CTRL RETURN SENSOR CKP SENSOR SIGNAL TAN WIRE TAN/WHT WIRE TANK PRESSURE SENSOR (TOP OF FUEL TANK) VEHICLE SPEED OUT VEHICLE SPEED SENSOR (VSS) (LEFT SIDE OF TRANSMISSION) WHL SPD SIG, LEFT FRT CAM POSIT SENS SIG WHT DK GRN/ WIRE WHT LT BLU/ WIRE WHT LT GRN/ WIRE WHT WIRE YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOLENOID 2-3 SHIFT SOLENOID AUTOMATIC TRANSMISSION (A/T) (IF EQUIPPED) (REAR OF ENGINE) BLK WIRE BLK/WHT WIRE BRN WIRE DK BLU WIRE DK GRN/WHT WIRE ECM 1 FUSE 12 ENG 1 FUSE 15 FUEL INJECTOR NO.2 FUEL INJECTOR NO.1 FUEL INJECTOR NO.3 FUEL INJECTOR NO.4 FUEL INJECTOR NO.5 FUEL INJECTOR NO.6 GRY WIRE HOT IN RUN, START I/P FUSE BLOCK (BEHIND DASH PANEL) (BODY BUILDER INSTALLED) LT BLU WIRE LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE NCA WIRE PNK PNK PNK 2 3 4 5 WIRE PNK PNK PNK 2 3 4 WIRE PNK PNK WIRE PNK WIRE PNK/BLK WIRE PPL PPL/WHT WIRE PRESSURE CONTROL SOLENOID (PCS) RED WIRE RED/BLK WIRE REV TAN WIRE TAN/WHT WIRE TCC PWM SOLENOID TRANS FUSE 17 TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR TRANSMISSION RANGE (TR) PRESSURE SWITCH ASSEMBLY WHT WIRE YEL WIRE YEL/BLK WIRE