GMC Forward Control P3500 (1985-1999) headlamps switch Wiring diagrams

BACKUP LAMPS CIRCUIT BLK WIRE BLK/WHT WIRE BRN WIRE DK BLU WIRE DK GRN WIRE ENGINE CONTROLS SYSTEM (W/ DIESEL) GRN WIRE HAZARD HAZARD LAMPS FLASHER (ON INNER LEFT SIDE OF STEERING COLUMN SUPPORT BRACKET) HEAD OFF HEADLAMPS SWITCH HOT AT ALL TIMES HOT IN I/P FUSE BLOCK INSTRUMENT CLUSTER RIGHT TURN IND. INTERIOR LAMPS SYSTEM LEFT FRONT PARK/ TURN SIGNAL LAMP LEFT FRONT SIDE MARKER LAMP LEFT LICENSE LAMPS RIGHT LICENSE LAMPS LEFT REAR SIDE MARKER LAMP LEFT TURN IND LT BLU WIRE NCA WIRE NORMAL ORG/ WIRE PARK PPL PROVISION FOR CENTER HIGH MOUNTED STOP LAMP PROVISIONS FOR MARKER LAMPS (NEAR I/P FUSE BLOCK) RIGHT FRONT PARK/ TURN SIGNAL LAMP RIGHT REAR SIDE MARKER LAMP RIGHT TAIL/STOP, TURN SIGNAL LAMPS RUN WIRE STOP STOP-HAZ FUSE 11 TAIL TAIL LAMPS FUSE 7 TAIL STOP TAIL/STOP, TURN SIGNAL LAMPS TORQUE CONVERTER CLUTCH, STOP LAMPS SWITCH (AT BASE OF BRAKE PEDAL SUPPORT) TURN TURN B/U FUSE 5 TURN LEFT TURN RIGHT TURN SIGNAL FLASHER TURN SIGNAL SWITCH WHT WIRE YEL WIRE

7.4L BACK-UP LAMPS CIRCUIT BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE CRUISE CONTROL SYSTEM DK BLU WIRE DK GRN WIRE ENGINE CONTROLS SYSTEM GRN WIRE HAZARD HAZARD LAMPS FLASHER (INNER LEFT SIDE OF STEERING COLUMN SUPPORT BRACKET) HEAD OFF 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 LAMP LEFT FRONT SIDE MARKER LAMP LEFT REAR SIDE MARKER LAMP LEFT TAIL/ STOP/ TURN SIGNAL 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 MARKER LAMPS RIGHT FRONT PARK/ TURN SIGNAL LAMP RIGHT FRONT SIDE MARKER LAMP RIGHT REAR SIDE MARKER LAMP RIGHT LICENSE LAMP LEFT LICENSE LAMP RIGHT TAIL/ STOP/ TURN SIGNAL LAMP RUN WIRE STOP-HAZ FUSE 11 TAIL LPS 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 YEL WIRE

BLK WIRE FUSIBLE LINK (16 GA- GRN WIRE HEAD HEADLAMPS SWITCH HI BEAM INDICATOR HOT AT ALL TIMES INSTRUMENT CLUSTER LEFT HEADLAMP HI LO HEADLAMPS DIMMER SWITCH LT GRN WIRE OFF PARK RED WIRE RIGHT HEADLAMP HI LO TAN WIRE YEL WIRE

1996 VFTC ACCY BLK WIRE BLK/WHT WIRE BULB TEST DAYTIME RUNNING LAMPS (DRL) MODULE (ATTACHED TO I/P HARNESS AT STEERING COLUMN) DAYTIME RUNNING LAMPS (DRL) RELAY (ON MAIN SUPPORT BRACKET AT DRIVER'S ISLAND) DAYTIME RUNNING LAMPS (DRL) RELAY 2 DIODE NETWORK DK BLU WIRE DK GRN/WHT WIRE DRL INDICATOR GAUGES FUSE GRN WIRE HEAD- LAMP DIMMER SWITCH HEADLAMPS SWITCH HI BEAM INDICATOR HI LO HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK IGNITION SWITCH INSTRUMENT CLUSTER INSTRUMENT CLUSTER SYSTEM LEFT HEAD- LAMP LEFT HI BEAM HEAD- LAMP LO HI LOCK OFF LT GRN WIRE LT GRN/BLK WIRE NEAR BREAKOUT FOR CHASSIS HARNESS) ORG/ WIRE PARK BRAKE IN FOG LAMPS PARK BRAKE INDICATOR SWITCH (ON PARK BRAKE) PARK HEAD OFF PNK IGNITION LAMP FEED HI BM FEED HI BM INDICATOR DRL RELAY CTRL GROUND WIRE PNK WIRE RIGHT HEAD- LAMP RIGHT HI BEAM HEAD- LAMP RUN WIRE TAN WIRE TAN/WHT WIRE WHT WIRE YEL WIRE

1995 VFTC BLK WIRE GRN WIRE HEADLAMPS SWITCH HI BEAM INDICATOR HOT AT ALL TIMES INSTRUMENT CLUSTER LEFT HEAD- LAMP HI BEAM (W/ DUAL HEAD- LAMPS) LEFT HEAD- LAMP HI HI LO LO HEADLAMPS DIMMER SWITCH LT GRN WIRE LT LT OFF HEAD PARK RIGHT HEAD LAMP LO RIGHT HEAD- LAMP HI BEAM (W/ DUAL HEAD- LAMPS) TAN WIRE YEL WIRE

1996 VFTC ACCY BLK WIRE BLK/WHT WIRE BULB TEST DAYTIME RUNNING LAMPS (DRL) MODULE (ATTACHED TO I/P HARNESS AT STEERING COLUMN) DAYTIME RUNNING LAMPS (DRL) RELAY (ON MAIN SUPPORT BRACKET AT DRIVER'S ISLAND) DIODE NETWORK DK BLU WIRE DK GRN/WHT WIRE DRL INDICATOR GAUGES FUSE GRN WIRE HEAD- LAMP DIMMER SWITCH HEADLAMPS SWITCH HI LO HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK IGNITION SWITCH INSTRUMENT CLUSTER INSTRUMENT CLUSTER SYSTEM HI BEAM INDICATOR LEFT HEAD- LAMP LO HI LOCK OFF LT GRN WIRE LT GRN/BLK WIRE NEAR BREAKOUT FOR CHASSIS HARNESS) ORG/ WIRE PARK BRAKE IN FOG LAMPS PARK BRAKE INDICATOR SWITCH (ON PARK BRAKE) PARK HEAD OFF PNK IGNITION LAMP FEED HI BM FEED HI BM INDICATOR DRL RELAY CTRL GROUND WIRE PNK WIRE RIGHT HEAD- LAMP RUN WIRE TAN WIRE TAN/WHT WIRE WHT WIRE YEL WIRE

BLK WIRE BRN WIRE DK GRN WIRE DOME LAMP SWITCH GRY WIRE HEADLAMPS SWITCH HIGH DIM HORN DIM FUSE 3 HOT AT ALL TIMES I/P FUSE BLOCK I/P LAMPS DIMMER SWITCH INSTR LPS FUSE 16 INSTRUMENT CLUSTER LIGHT SWITCH OFF HEAD PARK ORG/ WIRE PANEL LAMPS SWITCH PROVISION FOR DOME LAMP PROVISION FOR MARKER LAMPS SEAT BELT ALARM MODULE TAIL LPS FUSE 7 TRANSMISSION RANGE INDICATOR LAMP WHT WIRE

BLK WIRE BRN WIRE DIM HIGH DK GRN WIRE DOME LAMP SWITCH GRY WIRE HEADLAMPS SWITCH HORN DM FUSE 3 HOT AT ALL TIMES I/P FUSE BLOCK I/P LAMPS DIMMER SWITCH INSTR LPS FUSE 16 INSTRUMENT CLUSTER LIGHT SWITCH OFF HEAD PARK ORG/ WIRE PANEL LAMPS SWITCH PRNDL LAMP PROVISION FOR DOME LAMP PROVISION FOR ROOF MARKER LAMPS SEAT BELT ALARM (BOTTOM OF I/P FUSE BLOCK) TAIL LPS FUSE 7 WHT WIRE

1996 VFTC A/C COMPRESSOR CLUTCH RELAY AUXILIARY ENGINE COOLANT FAN RELAY (DIESEL ONLY) BATT BUS BATTERY BATTERY JUNCTION BLOCK (LEFT SIDE OF ENGINE BULKHEAD, ABOVE RELAY BRACKET) BLK WIRE DATA LINK CONNECTOR (DLC) DIESEL DOME LAMP (PROVISIONS FOR) ECM BAT FUSE ENG-BAT FUSE FUEL PUMP RELAY FUEL PUMP SWITCH, ENGINE OIL PRESSURE GAUGE SENSOR FUSIBLE LINK (10 GA-RUST) FUSIBLE LINK (16 GA- FUSIBLE LINK 12 GA. BLUE FUSIBLE LINK 18 GA. BLUE FUSIBLE LINK 18 GA. RUST GAS GENERATOR (RIGHT FRONT OF ENGINE) GLOW PLUG CONTROL SWITCH (DIESEL ONLY) GRY WIRE HAZARD WARNING LAMPS FLASHER HEADLAMPS SWITCH HORN RELAY HORN/ DM FUSE TAIL LPS FUSE I/P FUSE BLOCK (DASH PANEL PROVIDED BY BODY BUILDER) (BODY BUILDER INSTALLED) IGNITION SWITCH ORG/ WIRE PWR BUS PWR FUSE RED WIRE REMOTE BATTERY ACCESS TERMINAL BLOCK (REAR OF RIGHT RADIATOR CORE SUPPORT PANEL) SEAT BELT ALARM SECONDARY BATTERY (DIESEL ONLY) STARTER RELAY STARTER SOLENOID (AT STARTER, LOWER RIGHT SIDE OF ENGINE) STOP/ HAZ FUSE STUD TO HEADLAMPS SWITCH (CAVITY E) TORQUE CONVERTER CLUTCH, STOPLAMPS SWITCH TRANSMISSION CONTROL MODULE (A/T ONLY) VEHICLE CONTROL MODULE (VCM) W/DELUXE SCHOOL BUS

1996 VFTC 7.20 +/- 1.20 OHMS BRN WIRE DASH LAMPS INPUT DK GRN WIRE FROM I/P FUSE BLOCK (TAIL LAMPS FUSE) GRY WIRE HEAD OFF PARK HEADLAMPS SWITCH I/P LAMPS DIMMER SWITCH INSTRUMENT CLUSTER LICENSE LAMPS, LEFT REAR LICENSE LAMPS, RIGHT REAR MARKER LAMPS (PROVISIONS FOR) ORG/ WIRE PANEL ILLUMINATION PANEL LAMPS SWITCH PARK PARK, TURN SIGNAL (T/S) LAMP LEFT FRONT PARK, TURN SIGNAL (T/S) LAMP RIGHT FRONT PRNDL LAMP SEAT BELT ALARM SIDE MARKER LAMP LEFT FRONT SIDE MARKER LAMP RIGHT FRONT SIDE MARKER LAMP, LEFT REAR (PROVISIONS FOR) SIDE MARKER LAMP, RIGHT REAR (PROVISIONS FOR) TAIL TAIL, STOP/TURN SIGNAL LAMPS LEFT (PROVISIONS FOR) TAIL, STOP/TURN SIGNAL LAMPS RIGHT (PROVISIONS FOR)