GMC Pickup K2500 (1985-2000) headlight switch assembly Wiring diagrams

BLK WIRE BLU WIRE BRN WIRE BULB CHECK FOG LTS ENABLE CONVENIENCE CENTER DAYTIME RUNNING LAMP INDICATOR INSTRUMENT CLUSTER DAYTIME RUNNING LAMPS MODULE (BEHIND LEFT SIDE OF I/P) DAYTIME RUNNING LAMPS RELAY (ENGINE COMPARTMENT FRONT PLENUM PANEL) DIODE DK BLU WIRE DK GRN/WHT WIRE FOG LAMP ON INDICATOR SOLID STATE SWITCH FOG LAMP RELAY FOG LAMP SWITCH GRN WIRE GRY WIRE HEAD PARK HEADLAMP DIMMER SWITCH HEADLIGHT SWITCH ASSEMBLY HI BEAM INDICATOR HI LO HOT AT ALL TIMES HOT AT ALL TIMES DRL-FOG FUSE 15 HOT IN RUN, BULB TEST OR START FUSE BLOCK GAUGES FUSE 4 ILLUM LAMP LAMP FEED HI BEAM FEED HI BEAM INDICATOR LEFT HIGH BEAM HEADLAMP LEFT LOW BEAM HEADLAMP LT GRN WIRE LT GRN/BLK WIRE OFF OFF HEAD ORG/ WIRE OUTPUT TO RELAY GROUND PARK PARK BRAKE WARNING SWITCH (AT PARK BRAKE, UNDER LEFT SIDE OF I/P) PICKUP EXT. CAB PNK IGNITION WIRE PNK WIRE PPL PPL LEFT FOG LAMP PPL RIGHT FOG LAMP RIGHT HIGH BEAM HEADLAMP RIGHT LOW BEAM HEADLAMP SUBURBAN PICKUP UTILITY EXT. CAB CREW CAB SUBURBAN UTILITY CREW CAB TAN WIRE TAN/WHT WIRE WHT WIRE YEL WIRE

BLK WIRE BRN WIRE BULB CHECK FOG LTS ENABLE CONVENIENCE CENTER DAYTIME RUNNING LAMP INDICATOR INSTRUMENT CLUSTER DAYTIME RUNNING LAMPS MODULE (BEHIND LEFT SIDE OF I/P) DAYTIME RUNNING LAMPS RELAY (ENGINE COMPARTMENT FRONT PLENUM PANEL) DIODE DK BLU WIRE DK GRN/WHT WIRE FOG LAMP ON INDICATOR SOLID STATE SWITCH FOG LAMP RELAY FOG LAMP SWITCH GRN WIRE GRY WIRE HEAD PARK HEADLAMP DIMMER SWITCH HEADLIGHT SWITCH ASSEMBLY HI BEAM INDICATOR HI LO HOT AT ALL TIMES HOT AT ALL TIMES DRL-FOG FUSE 15 HOT IN RUN, BULB TEST OR START FUSE BLOCK GAUGES FUSE 4 ILLUM LAMP LAMP FEED HI BEAM FEED HI BEAM INDICATOR LEFT HEADLAMP ASSEMBLY HI LO LT GRN WIRE LT GRN/BLK WIRE OFF OFF HEAD ORG/ WIRE OUTPUT TO RELAY GROUND PARK PARK BRAKE WARNING SWITCH (AT PARK BRAKE, UNDER LEFT SIDE OF I/P) PICKUP EXT. CAB PNK IGNITION WIRE PNK WIRE PPL PPL LEFT FOG LAMP PPL RIGHT FOG LAMP RIGHT HEADLAMP ASSEMBLY HI LO SUBURBAN PICKUP UTILITY EXT. CAB CREW CAB SUBURBAN UTILITY CREW CAB TAN WIRE TAN/WHT WIRE WHT WIRE YEL WIRE

BLK WIRE BRN WIRE BULB CHECK DAYTIME RUNNING LAMP INDICATOR DAYTIME RUNNING LAMPS MODULE (BEHIND LEFT SIDE OF I/P) DAYTIME RUNNING LAMPS RELAY (ENGINE COMPARTMENT FRONT PLENUM PANEL) DK BLU/WHT WIRE DRL FUSE FUSE BLOCK GRN WIRE HEAD PARK HEADLAMP DIMMER SWITCH HEADLIGHT SWITCH ASSEMBLY HI BEAM INDICATOR HOT AT ALL TIMES HOT IN RUN HOT IN RUN, BULB TEST OR START GAUGES FUSE HTR A/C FUSE IGNITION LAMP FEED HI BEAM FEED HI BEAM INDICATOR OUTPUT TO RELAY GROUND INSTRUMENT CLUSTER LEFT HIGH BEAM HEADLAMP LEFT LOW BEAM HEADLAMP LT GRN WIRE LT GRN/BLK WIRE LT LT OFF OFF HEAD ORG/ WIRE PARK PARK BRAKE WARNING SWITCH (AT PARK BRAKE, UNDER LEFT SIDE OF I/P) PICKUP ONLY PNK/BLK WIRE RIGHT HIGH BEAM HEADLAMP RIGHT LOW BEAM HEADLAMP SUBURBAN, UTILITY ONLY TAN WIRE TAN/WHT WIRE WHT WIRE YEL WIRE

BLK WIRE BRN WIRE BULB CHECK DAYTIME RUNNING LAMP INDICATOR DAYTIME RUNNING LAMPS MODULE (BEHIND LEFT SIDE OF I/P) DAYTIME RUNNING LAMPS RELAY (ENGINE COMPARTMENT FRONT PLENUM PANEL) DK BLU/WHT WIRE DRL FUSE FUSE BLOCK GRN WIRE HEAD PARK HEADLAMP DIMMER SWITCH HEADLIGHT SWITCH ASSEMBLY HI BEAM INDICATOR HI LO HOT AT ALL TIMES HOT IN RUN HOT IN RUN, BULB TEST OR START GAUGES FUSE HTR A/C FUSE IGNITION LAMP FEED HI BEAM FEED HI BEAM INDICATOR OUTPUT TO RELAY GROUND INSTRUMENT CLUSTER LEFT HEADLAMP ASSEMBLY LT GRN WIRE LT GRN/BLK WIRE LT LT OFF OFF HEAD ORG/ WIRE PARK PARK BRAKE WARNING SWITCH (AT PARK BRAKE, UNDER LEFT SIDE OF I/P) PICKUP ONLY PNK/BLK WIRE RIGHT HEADLAMP ASSEMBLY SUBURBAN, UTILITY ONLY TAN WIRE TAN/WHT WIRE WHT WIRE YEL WIRE

BLK WIRE GRN WIRE HEADLAMP DIMMER SWITCH HEADLIGHT SWITCH ASSEMBLY HI BEAM INDICATOR HI LO HOT AT ALL TIMES LEFT HEADLAMP ASSEMBLY LO HI LT GRN WIRE LT INSTRUMENT CLUSTER OFF OFF HEAD HEAD PARK PARK RIGHT HEADLAMP ASSEMBLY TAN WIRE YEL WIRE

BLK WIRE BRN WIRE CONVENIENCE CENTER DK BLU WIRE FOG LAMP ON INDICATOR FOG LAMP RELAY (BEHIND LEFT SIDE OF I/P) FOG LAMP SWITCH SOLID STATE SWITCH FUSE BLOCK GRN WIRE GRY WIRE HEADLAMP DIMMER SWITCH HEADLIGHT SWITCH ASSEMBLY HI BEAM INDICATOR HI LO HOT AT ALL TIMES HOT AT ALL TIMES ACC-BATT CIRCUIT BREAKER ILLUM LAMP LEFT LOW BEAM HEAD- LAMP LT GRN WIRE LT INSTRUMENT CLUSTER LT LT OFF OFF HEAD HEAD PARK ORG/BLK WIRE PARK PNL LPS FUSE PPL PPL PPL RIGHT FOG LAMP LEFT FOG LAMP RIGHT HIGH BEAM HEAD- LAMP LEFT HIGH BEAM HEAD- LAMP RIGHT LOW BEAM HEAD- LAMP TAN WIRE VARIABLE VOLTAGE W/ HEADLIGHT SWITCH IN PARK OR HEAD, RHEOSTAT ADJUSTED WHT WIRE YEL WIRE

ASHTRAY LAMP AUXILIARY A/C-HEATER FRONT CONTROL LAMP BLK WIRE BRN WIRE CONVENIENCE CENTER DK GRN WIRE FOUR-WHEEL DRIVE ILLUMINATION LAMP FUSE BLOCK FUSE BLOCK PNL LPS FUSE GRY WIRE HEADLIGHT SWITCH ASSEMBLY HEATER A/C CONTROL LAMPS HEATER CONTROL LAMPS HIGH DIM HOT AT ALL TIMES INSTRUMENT CLUSTER LIGHT SWITCH OFF HEAD PARK ORG/ WIRE PANEL DIMMER SWITCH (ASSEMBLY) PARK LP FUSE RADIO REAR DEFOGGER LAMP SOLID STATE

ACCY ACCY BULB TEST LOCK OFF AUDIO ALARM AUXILLARY COOLING FAN RELAY BLK WIRE BLK/RED WIRE BRN WIRE BULB TEST CIGARETTE LIGHTER CIRCUIT BREAKER CLUTCH PEDAL SWITCH CONVEN- IENCE CENTER CONVENIENCE CENTER CRANK FUSE CTSY FUSE PARK LPS FUSE DAYTIME RUNNING LAMPS RELAY FUEL PUMP RELAY FUSE BLOCK FUSES FUSIBLE FUSIBLE LINK GENERATOR GLOW PLUG CONTROLLER GRY WIRE HEADLIGHT SWITCH ASSEMBLY HORN RELAY (CONVENIENCE CENTER) HTR-A/C, RR HVAC, IGNITION SWITCH LEFT BATTERY RIGHT BATTERY LINK LOCK LOCK OFF LOW BLOWER MEDIUM HIGH RELAY BLOWER BLOWER RELAY RELAY MODULE OFF ORG/ WIRE PNK WIRE POWERTRAIN FUEL CONTROL PUMP/OIL MODULE PRESSURE (PCM) SWITCH PPL PPL/ WHT WIRE PWR RADIO DOME LAMP REAR WINDOW RELEASE RELAY REAR WINDOW RELEASE SWITCH RED WIRE RR WPR, FRT WPR, RDO FUSES AND AND PWR WDO CIRCUIT BREAKER RUN WIRE STARTER MOTOR SOLENOID STOP FUSE SUBURBAN, UTILITY EXC. SUBURBAN, UTILITY SUBURBAN, UTILITY ONLY T/G REL FUSE DRL FUSE TRANS ECM-IGN, GLOW TURN B/U FUSE PLUGS, GAUGES FUSES W/ AUTO TRANS W/ AUTOMATIC TRANSMISSION WHT PPL/ WIRE YEL WIRE

ACCY AUDIO BATTERY BLK WIRE BLK/RED WIRE BRN WIRE BULB TEST CIGARETTE LIGHTER CIRCUIT BREAKER CLUTCH PEDAL SWITCH CONVEN- IENCE CENTER CONVENIENCE CENTER CRANK FUSE CTSY FUSE PARK LPS FUSE DAYTIME RUNNING LAMPS RELAY FUEL AUXILLARY PUMP COOLING RELAY FAN RELAY FUSE BLOCK FUSES FUSIBLE FUSIBLE LINK GENERATOR GRY WIRE HEADLIGHT SWITCH ASSEMBLY HIGH BLOWER RELAY HORN RELAY (CONVENIENCE CENTER) HTR-A/C, RR HVAC, IGNITION COIL IGNITION SWITCH LINK LOCK LOCK OFF LOW BLOWER MEDIUM RELAY BLOWER RELAY MODULE OFF ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE POWERTRAIN FUEL CONTROL PUMP/OIL MODULE PRESSURE (PCM) SWITCH PPL PPL/ WHT WIRE PWR RADIO DOME LAMP REAR (PCM) WINDOW RELEASE RELAY REAR WINDOW RELEASE SWITCH RED WIRE RR WPR, FRT WPR, RDO FUSES AND AND PWR WDO CIRCUIT BREAKER RUN WIRE STARTER MOTOR SOLENOID STOP FUSE SUBURBAN, UTILITY EXC. SUBURBAN, UTILITY SUBURBAN, UTILITY ONLY ENGINES W/ MANUAL TRANSMISSIONS ONLY T/G REL FUSE DRL FUSE TRANS, ECM-IGN, TURN B/U INJ, GAUGES FUSES FUSES VIN H&K MANUAL TRANS ONLY W/ AUTO TRANS W/ AUTOMATIC TRANSMISSION WHT PPL/ WIRE YEL WIRE

BLK WIRE BRN WIRE ENDGATE MARKER LAMPS FRONT MARKER, PARK/TURN LAMPS FUSE BLOCK- I/P HEAD OFF HEADLIGHT SWITCH ASSEMBLY HOT AT ALL TIMES LEFT FRONT CLEARANCE LAMP LEFT REAR CLEARANCE LAMP LEFT REAR FENDER ORG/ WIRE PARK PARK LPS FUSE RIGHT FRONT CLEARANCE LAMP RIGHT REAR CLEARANCE LAMP RIGHT REAR FENDER TAIL/STOP/TURN, LICENSE LAMPS) TRAILER TOW