GMC Forward Control P3500 (1985-1999) blk Wiring diagrams

A/C COMPRESSOR CLUTCH RELAY (ENGINE BULKHEAD RELAY BRACKET) A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (REAR OF COMPRESSOR) A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH (REAR OF COMPRESSOR) A/C ENABLE BLK WIRE DIODE A/C COMPRESSOR CLUTCH DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENG-BAT FUSE GAUGES FUSE GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BOX ORG/ WIRE PNK WIRE VEHICLE CONTROL MODULE (LEFT RADIATOR SUPPORT) A/C REQUEST WHT WIRE

A/C COMPRESSOR CLUTCH RELAY (ENGINE BULKHEAD RELAY BRACKET) A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (REAR OF COMPRESSOR) A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH (REAR OF COMPRESSOR) A/C ENABLE BLK WIRE DIODE A/C COMPRESSOR CLUTCH DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENG-BAT FUSE GAUGES FUSE GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BOX ORG/ WIRE PNK WIRE VEHICLE CONTROL MODULE (LEFT RADIATOR SUPPORT) A/C REQUEST WHT WIRE

A/C COMPRESSOR CLUTCH DIODE A/C COMPRESSOR CLUTCH RELAY (ENGINE BULKHEAD RELAY BRACKET) A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (REAR OF COMPRESSOR) A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH (REAR OF COMPRESSOR) A/C ENABLE AUXILIARY ENGINE COOLANT FAN AUXILIARY ENGINE COOLANT FAN A/C PRESSURE SWITCH (IN A/C HIGH PRESSURE LINE) AUXILIARY ENGINE COOLANT FAN RELAY (ENGINE BULKHEAD RELAY BRACKET) AUXILIARY FAN CONTROL SWITCH (ON RIGHT SIDE OF CYLINDER HEAD) BLK WIRE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENG 1 FUSE ENG-BAT FUSE FUSIBLE LINK GAUGES FUSE GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START I/P FUSE BOX ORG/ WIRE PNK WIRE RED WIRE VIN J VIN F WHT WIRE

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/T ISS SENS HI IN A/T ISS SENS LO IN ACCELERATOR PEDAL POSITION (APP) MODULE (THROTTLE PEDAL MOUNT) APP 1 SIGNAL IN APP 2 SIGNAL IN APP 3 SIGNAL IN AUTO TRANSMISSION INPUT SHAFT SPEED SENSOR (INSIDE FRONT OF TRANSMISSION) AUTOMATIC TRANSMISSION BATTERY IN BLK WIRE BRAKE SWITCH ASSEMBLY (ON BRAKE PEDAL BRACKET) BRAKE SWITCH IN BRN WIRE BRN/WHT WIRE CLASS II DATA DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ECM BATT FUSE ECM I FUSE ECT SENSOR IN ENGINE COOLANT TEMP SENSOR (LEFT LOWER FRONT OF ENGINE) GAUGES FUSE TRANS FUSE GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START I-3 FUSE I/P FUSE BLOCK IGNITION IN INSTRUMENT CLUSTER LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MALFUNCTION INDICATOR LAMP MIL CONTROL ORG/ WIRE PCM GROUND PCS SOL HI OUT PCS SOL LO OUT PNK WIRE POWERTRAIN CONTROL MODULE (ENGINE COMPT, TOP OF RADIATOR SUPPORT) PPL PPL DATA LINK CONNECTOR PPL/WHT WIRE PRESS CTRL SOLENOID RED WIRE RED/BLK WIRE SENSOR GROUND STOP/HAZ FUSE STOPLAMP SWITCH IN TFT SENSOR IN TRANS FLUID TEMP SENSOR TRANS RANGE "A" TRANS RANGE "B" TRANS RANGE "C" TRANS RANGE PRESSURE SWITCH ASSEMBLY VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VEHICLE SPEED SENSOR (VSS) BUFFER (ABOVE ACCELERATOR PEDAL) VSS HI IN VSS LO IN VSS OUT YEL WIRE YEL/BLK WIRE

A/C COMPRESSOR CLUTCH RELAY (ENGINE BULKHEAD RELAY BRACKET) A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (REAR OF COMPRESSOR) A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH (REAR OF COMPRESSOR) AUXILIARY ENGINE COOLANT FAN AUXILIARY ENGINE COOLANT FAN A/C PRESSURE SWITCH (IN A/C HIGH PRESSURE LINE) AUXILIARY ENGINE COOLANT FAN RELAY (ENGINE BULKHEAD RELAY BRACKET) AUXILIARY FAN CONTROL SWITCH (RIGHT SIDE OF CYLINDER HEAD) BLK WIRE BRN WIRE DIODE A/C COMPRESSOR CLUTCH DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENG-BAT FUSE FUSIBLE LINK GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN ENG 1 FUSE I/P FUSE BOX ORG/ WIRE PNK WIRE RED WIRE VIN N ONLY

1-2 SHIFT SOL 9 6 DATA LINK CONNECTOR BLK WIRE BLK/WHT WIRE BRN WIRE DK BLU WIRE DK BLU/WHT WIRE ECM BAT FUSE ECM I FUSE ENGINE SPEED SENSOR (TOP CENTER OF ENGINE) GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START I-3 FUSE I/P FUSE BLOCK INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE ORG/ WIRE PNK RANGE SIGNAL A RANGE SIGNAL B RANGE SIGNAL C WIRE PNK WIRE PPL PPL/WHT WIRE RANGE MODE SELECTOR PRESSURE CONTROL SOLENOID RED WIRE RED/BLK WIRE SERVICE TRANSMISSION INDICATOR SYSTEM GROUND SYSTEM GROUND 452 416 SENSOR GROUND 5 VOLTS REF TAN WIRE TCC SOL 2-3 SHIFT SOL TCC/BRAKE SWITCH (BRAKE PEDAL BRACKET) THROTTLE POSITION SENSOR (RIGHT SIDE OF THROTTLE BODY) TRANS FUSE TRANS- MISSION TEMP SENSOR TRANSMISSION TRANSMISSION CONTROL MODULE (TCM) (LEFT SIDE OF DRIVER'S ISLAND) TRANSMISSION INPUT SHAFT SPEED SENSOR (LEFT FRONT SIDE OF TRANSMISSION) VEHICLE SPEED SENSOR (REAR OF TRANSMISSION) VEHICLE SPEED SENSOR BUFFER VEHICLE SPD OUTPUT VSS INPUTS WHT WIRE WHT/BLK WIRE YEL/BLK WIRE

2-3 SHIFT SOL 6 9 DATA LINK CONNECTOR BLK WIRE BRN WIRE BRN/WHT WIRE DK BLU WIRE DK BLU/WHT WIRE ECM BAT FUSE ECM I FUSE ENGINE COOLANT TEMPERATURE (ECT) SENSOR (TOP FRONT OF ENGINE) GAUGES FUSE GRY WIRE GRY/RED WIRE HOT AT ALL TIMES HOT IN HOT IN RUN OR START HOT IN RUN, BULB TEST OR START I-3 FUSE I/P FUSE BLOCK INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE ORG/ WIRE PNK IGNITION FEED WIRE PNK WIRE POWERTRAIN CONTROL MODULE (PCM) (LEFT SIDE OF DRIVER'S ISLAND) PPL PPL PNK WIRE PPL/WHT WIRE PRESSURE CONTROL SOLENOID RANGE MODE SELECTOR RED WIRE RED/BLK WIRE RUN WIRE SERVICE ENGINE SOON INDIC SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) TAN WIRE TCC PWM SOL 1-2 SHIFT SOL TCC/BRAKE SWITCH (ON BRAKE PEDAL BRACKET) THROTTLE POSITION SENSOR (ON SIDE OF THROTTLE BODY) TRANS FLUID TEMP (TFT) SENSOR TRANS FUSE TRANSMISSION TRANSMISSION INPUT SHAFT SPEED SENSOR (FRONT OF TRANSMISSION) VEHICLE SPEED SENSOR BUFFER WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

1995 VFTC BLK WIRE CONTROL AREA DELAY/ SPEED/ WASH CONTROL FUSE BLOCK FUSIBLE LINK GRY WIRE HOT IN ACCY OR RUN IGN MIST NCA WIRE OFF PARK SWITCH PNK WIRE PPL PULSE WASH SWITCH WHT WIRE WINDSHIELD WASHER PUMP (LEFT KICK PANEL) (CENTER OF I/P) WINDSHIELD WIPER MOTOR MODULE WINDSHIELD WIPER/ WASHER SWITCH WIPER FUSE

1995 VFTC BLK WIRE CONTROL AREA DELAY/ SPEED/ WASH CONTROL FUSE BLOCK FUSIBLE LINK GRY WIRE HOT IN ACCY OR RUN I/P GROUND (IN I/P HARNESS) IGN MIST OFF ORG/ WIRE PARK SWITCH PNK WIRE PPL PULSE WASH PULSE SWITCH WHT WIRE WINDSHIELD WASHER PUMP WINDSHIELD WIPER MOTOR MODULE WINDSHIELD WIPER/ WASHER SWITCH WIPER FUSE

8 250 40 250 250 LAMP ON INPUT GROUND POWER (BATTERY) SEAT BELT SWITCH BLK WIRE GAUGES FUSE 8 GRY WIRE HORN/DM FUSE 3 HOT AT ALL TIMES HOT IN RUN AND START HOT W/ PARK OR HEADLAMPS SWITCH ON I/P FUSE BLOCK INSTR LPS FUSE 16 INSTRUMENT CLUSTER ORG/ WIRE PNK POWER (IGNITION) WIRE PNK WIRE SEAT BELT TELL TALE SEAT BELT/LAMPS ALARM MODULE (AT THE BOTTOM OF THE I/P FUSE BLOCK) YEL WIRE