GMC Rally G2500 (1985-1995) headlight switch Wiring diagrams

BATTERY JUNCTION BLOCK (LEFT SIDE OF COWL) BLK WIRE DOME SWITCH FRONT DOME LAMP FRONT DOME/ READING LAMPS FUSE BLOCK- I/P FUSIBLE LINK (20 GA-RUST) HEADLIGHT SWITCH HORN/DM FUSE HOT AT ALL TIMES IN LINE UNDERHOOD LAMP FUSE INTERIOR LIGHTING CONTROL SWITCH KEYLESS ENTRY MODULE LEFT DOOR JAMB SWITCH LEFT STEP- WELL LAMP LEFT VANITY MIRROR LAMP OPTIONAL ORG/ WIRE REAR DOME LAMP REAR DOME READING LAMPS REAR DOOR JAMB SWITCH RED WIRE RIGHT DOOR JAMB SWITCH RIGHT STEP- WELL LAMP RIGHT VANITY MIRROR LAMP SIDE DOOR JAMB SWITCH UNDERHOOD LAMP W/ LAMP GROUP W/KEYLESS ENTRY W/O KEYLESS ENTRY W/O LAMP GROUP WHT WIRE

BLK WIRE BLU WIRE BRAKE SWITCH (ON BRAKE PEDAL SUPPORT) BRN WIRE DK BLU WIRE DK GRN WIRE FUSE BLOCK- I/P GRN WIRE HAZARD HAZARD FLASHER (RIGHT SIDE OF STEERING COLUMN) HEAD HEADLIGHT SWITCH HOT AT ALL TIMES HOT IN RUN, BULB TEST OR START I/P DIMMER SWITCH INSTRUMENT CLUSTER LEFT FRONT MARKER LAMP LEFT LICENSE LAMP LEFT TAIL/STOP TURN LAMP LEFT TURN INDICATOR LT BLU WIRE LT GRN WIRE LT LT NORMAL OFF ORG/ WIRE PARK PPL PROVISIONS FOR PARK LAMPS PROVISIONS FOR REAR MARKER LAMPS RIGHT BACKUP LAMP LEFT BACKUP LAMP RIGHT FRONT MARKER LAMP RIGHT FRONT PARK/ TURN LAMP LEFT FRONT PARK/ TURN LAMP RIGHT LICENSE LAMP RIGHT TAIL/STOP/ TURN LAMP RIGHT TURN INDICATOR STOP/ HAZ FUSE TAIL LPS FUSE TURN LEFT TURN RIGHT TURN SIGNAL FLASHER TURN-B/U FUSE TURN/HAZARD SWITCH (LEFT SIDE OF STEERING COLUMN) WHT WIRE YEL WIRE

BACKUP LAMP SWITCH (ON STEERING COLUMN) BLK WIRE BLU WIRE BRN WIRE DK BLU WIRE DK GRN WIRE FUSE BLOCK (BEHIND LEFT SIDE OF I/P) G# N/A (IN REAR LAMPS HARNESS) GRN WIRE HAZARD HAZARD FLASHER HEAD HEADLIGHT SWITCH HOT AT ALL TIMES HOT IN RUN OR START INSTRUMENT CLUSTER LEFT BACKUP LAMP RIGHT BACKUP LAMP LEFT FRONT MARKER LAMP LEFT LICENSE LAMP LEFT PARK LAMP LEFT TAIL/STOP TURN LAMP LEFT TURN INDICATOR LT BLU WIRE LT LT NORMAL OFF ORG/ WIRE PARK PPL PROVISIONS FOR CLEARANCE LAMPS PROVISIONS FOR REAR MARKER LAMPS RIGHT FRONT MARKER LAMP RIGHT FRONT PARK/ TURN LAMP LEFT FRONT PARK/ TURN LAMP RIGHT LICENSE LAMP RIGHT PARK LAMP RIGHT TAIL/STOP TURN LAMP RIGHT TURN INDICATOR STOP/ HAZ FUSE STOPLAMP SWITCH (ON BRAKE PEDAL SUPPORT BRACKET) TAIL LPS FUSE TURN LEFT TURN RIGHT TURN SIGNAL FLASHER TURN-B/U FUSE TURN/HAZARD SWITCH (ON MULTI- FUNCTION LEVER) WHT WIRE YEL WIRE

BACKUP LAMP SWITCH (ON STEERING COLUMN) BLK WIRE BLU WIRE BRN WIRE DK BLU WIRE DK GRN WIRE FUSE BLOCK- I/P G# N/A (REAR LAMPS HARNESS) GRN WIRE HAZARD HAZARD FLASHER (TOP LEFT SIDE OF SHIPPING PANEL) HEAD OFF HEADLIGHT SWITCH HOT AT ALL TIMES HOT IN RUN OR START INSTRUMENT CLUSTER LEFT FRONT MARKER LAMP LEFT LICENSE LAMP RIGHT LICENSE LAMP LEFT TAIL/STOP TURN LAMP LEFT TURN INDICATOR LT BLU WIRE LT LT NORMAL ORG/ WIRE PARK PPL PROVISIONS FOR BODY BUILDER ADDED LAMPS PROVISIONS FOR REAR MARKER LAMPS RIGHT BACKUP LAMP LEFT BACKUP LAMP RIGHT FRONT MARKER LAMP RIGHT FRONT PARK/ TURN LAMP LEFT FRONT PARK/ TURN LAMP RIGHT TAIL/STOP TURN LAMP RIGHT TURN INDICATOR STOP/ HAZ FUSE STOPLAMP SWITCH (ON BRAKE PEDAL SUPPORT) TAIL LPS FUSE TURN LEFT TURN RIGHT TURN SIGNAL FLASHER TURN-B/U FUSE TURN/HAZARD SWITCH (UPPER LEFT SIDE OF STEERING COLUMN) WHT WIRE YEL WIRE

2-DR CAB 2-DR CAB AUXILIARY LEAD (TAPED TO BODY, NEAR FUSE BLOCK) DK BACKUP LIGHT SWITCH (ON STEERING COLUMN) BLK WIRE BLU WIRE BRN WIRE CENTER HIGH MOUNT STOP LAMP CHMSL GROUND (NEAR CHMSL) DK BLU WIRE DK GRN WIRE FUSE FUSE BLOCK (LEFT SIDE OF I/P) GRN WIRE HAZARD HAZARD FLASHER HEAD OFF PARK HEADLIGHT SWITCH HOT AT ALL TIMES HOT IN RUN OR START IN-LINE FUSE INSTRUMENT CLUSTER JUNCTION BLOCK (LEFT SIDE OF COWL) LEFT BACKUP LIGHT LEFT FRONT MARKER LIGHT LEFT FRONT PARK/ TURN LIGHTS LEFT REAR MARKER LIGHT RIGHT REAR MARKER LIGHT RH LH LEFT TAIL/ STOP/ TURN LIGHT LEFT TURN IND LEFT TURN, HAZARD LICENSE LIGHTS LT BLU WIRE LT GRN WIRE NORMAL NOTE:BULBS ARE CASE GROUNDED W/ 2-DR CAB ORG/ WIRE PPL RED WIRE RIGHT BACKUP LIGHT RIGHT FRONT MARKER LIGHT RIGHT FRONT PARK/ TURN LIGHTS RIGHT TAIL/ STOP/ TURN LIGHT RIGHT TURN IND RIGHT TURN, HAZARD STOP -HZ STOP LAMP SWITCH (ON BRAKE PEDAL SUPPORT BRACKET) TAIL LPS TURN B/U TURN FLASHER TURN/ HAZARD SWITCH W/ DRL W/O DRL W/OPTIONAL HEAVY-DUTY TRAILER TOW PACKAGE W/OPTIONAL TRAILER TOW PACKAGES WARNINGS SYSTEM WHT WIRE WIRE LEADS ARE SPLICED TO TRAILER WIRING, OR CONNECTED TO TRAILER WIRE PLUG YEL WIRE

2-DR CAB AUXILIARY LEAD (TAPED TO BODY, NEAR FUSE BLOCK) DK BACKUP LIGHT SWITCH (ON STEERING COLUMN) BLK WIRE BLU WIRE BRN WIRE CENTER HIGH MOUNT STOP LAMP CHMSL GROUND (NEAR CHMSL) DK BLU WIRE DK GRN WIRE FUSE FUSE BLOCK (LEFT SIDE OF I/P) GRN WIRE HAZARD HAZARD FLASHER HEAD OFF PARK HEADLIGHT SWITCH HOT AT ALL TIMES HOT IN RUN OR START IN-LINE FUSE INSTRUMENT CLUSTER JUNCTION BLOCK (LEFT SIDE OF COWL) LEFT BACKUP LIGHT LEFT FRONT MARKER LIGHT LEFT FRONT PARK LIGHT RIGHT FRONT PARK LIGHT LEFT FRONT PARK/ TURN LIGHT LEFT TAIL/ STOP/ TURN LIGHT LEFT REAR MARKER LIGHT LEFT TURN IND LEFT TURN, HAZARD LICENSE LIGHTS LT BLU WIRE LT GRN WIRE NORMAL NOTE:BULBS ARE CASE GROUNDED W/ 2-DR CAB ORG/ WIRE PPL RED WIRE RIGHT BACKUP LIGHT RIGHT FRONT MARKER LIGHT RIGHT FRONT PARK/ TURN LIGHT RIGHT REAR MARKER LIGHT RH LH RIGHT TAIL/ STOP/ TURN LIGHT RIGHT TURN IND RIGHT TURN, HAZARD STD 2-DR CAB STOP -HZ STOP LAMP SWITCH (ON BRAKE PEDAL SUPPORT BRACKET) TAIL LPS TURN B/U TURN FLASHER TURN/ HAZARD SWITCH W/OPTIONAL HEAVY-DUTY TRAILER TOW PACKAGE W/OPTIONAL TRAILER TOW PACKAGES WARNINGS SYSTEM WHT WIRE WIRE LEADS ARE SPLICED TO TRAILER WIRING, OR CONNECTED TO TRAILER WIRE PLUG YEL WIRE

AUDIO ALARM MODULE (BELOW I/P FUSE BLOCK) LIGHTS ON INPUT BLK WIRE BRN WIRE DK GRN WIRE FUSE BLOCK- I/P FUSE BLOCK: I/P INSTR LPS FUSE GRY WIRE HEADLIGHT SWITCH HEATER, A/C CONTROL ILLUM. LAMP HIGH DIM HOT AT ALL TIMES I/P DIMMER SWITCH INSTRUMENT CLUSTER LIGHT SWITCH OFF HEAD PARK ORG/ WIRE PRNDL ILLUM. LAMP RADIO SOLID STATE TAIL LPS FUSE

BLK WIRE BRN WIRE DK GRN WIRE FUSE BLOCK- I/P GRY WIRE HEADLIGHT SWITCH HIGH DIM HOT AT ALL TIMES I/P DIMMER SWITCH INSTR LPS FUSE INSTRUMENT CLUSTER LIGHT SWITCH OFF HEAD PARK ORG/ WIRE TAIL LPS FUSE TRANSMISSION RANGE INDICATOR LAMP

BLK WIRE BRN WIRE DK GRN WIRE FRONT DOME LAMP FUSE BLOCK- I/P FUSE BLOCK: I/P INSTR LPS FUSE GRY WIRE HEAD- LIGHT SWITCH DOME SWITCH HEADLIGHT SWITCH HIGH DIM HORN/DM FUSE HOT AT ALL TIMES I/P DIMMER SWITCH INSTRUMENT CLUSTER LEFT DOOR JAMB SWITCH LIGHT SWITCH OFF HEAD PARK ORG/ WIRE PROVISIONS FOR REAR DOME LAMP RADIO SOLID STATE TAIL LPS FUSE TRANS- MISSION RANGE INDICATOR LAMP HEATER CONTROL LAMP WHT WIRE

1995 VFTC ACCY ACCY BULB TEST LOCK OFF AUDIO ALARM MODULE CONVENIENCE CENTER BATTERY BATTERY JUNCTION BLOCK BLK WIRE BLK/RED WIRE BLOWER SWITCH RIGHT POWER WINDOW SWITCH BRN WIRE BULB TEST CONVENIENCE CENTER DAYTIME RUNNING LAMPS RELAY DK BLU WIRE DK GRN WIRE DRL FUSE PWR ACC CIRCUIT BREAKER FRONT DOME LAMP RADIO FUEL PUMP OIL PRESSURE SWITCH TURN SIGNAL FLASHER BACKUP LAMP SWITCH FUEL PUMP RELAY POWERTRAIN CONTROL MODULE (PCM) FUEL PUMP STOP-HZ FUSE FUSE FUSE BLOCK FUSIBLE FUSIBLE LINK GENERATOR GRY WIRE HEADLIGHT SWITCH HEATER RADIO CONTROL LAMP HIGH BLOWER RELAY HORN RELAY HORN/DM TAIL LPS FUSE FUSE SHUNT IGNITION COIL IGNITION SWITCH INSTR LPS FUSE INSTRUMENT CLUSTER LEFT DOOR LOCK SWITCH DOOR LOCK RELAY LEFT POWER WINDOW SWITCH LIGHT SWITCH LINK LOCK OFF NCA WIRE ORG/ WIRE ORG/BLK WIRE PNK WIRE PPL PROVISIONS FOR REAR DOME LAMP PWR WDO CIRCUIT BREAKER HTR A/C FUSE RADIO WINDSHIELD WIPER/ WASHER SWITCH WINDSHIELD WIPER MOTOR MODULE RED WIRE RIGHT DOOR LOCK SWITCH RUN WIRE STARTER SOLENOID STOPLAMP SWITCH HAZARD FLASHER AUDIO ALARM MODULE TO ECM I, GAGES, TRANS FUSES AND TRANSMISSION RANGE INDICATOR LAMP TURN-B/U FUSE RADIO WIPER FUSE FUSE W/ A/C W/ A/C W/O A/C W/O A/C WHT WIRE YEL WIRE