Chevrolet Cab & Chassis K2500 (1989-2000) underhood fuse block Wiring diagrams

39 (OR 1020) 7.4L VIN J ONLY 900 419 507 389 12 5 15 4 FUEL RET MIL IND UPSHIFT IND SPEEDO ACCY ANTI- LOCK BRAKES IND ANTI-LOCK BRAKES SYSTEM ANTI-THEFT SYSTEM BAT IND HI BEAM IND BLK WIRE BLK/WHT WIRE BRAKE IND BRAKE PRESSURE WARNING SWITCH (ON UNDERSIDE OF ELECTRONIC BRAKE CONTROL MODULE) BRN WIRE BRN/WHT WIRE CHECK GAUGES IND CHECK GAUGES LAMP DRIVER CONVENIENCE CENTER DAYTIME RUNNING LAMPS IND AIR BAG IND DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (EBCM) (ON LEFT SIDE OF ENGINE COMPT) ENGINE CONTROLS SYSTEM (FUEL PUMP BALANCE RELAY) FUEL GAUGE FUEL PUMP BALANCE MODULE (INSIDE LEFT SIDE OF FRAME RAIL) FUEL PUMP, SENDER (IN FUEL TANK) GRN WIRE GRY WIRE HEADLIGHTS SYSTEM HOT IN RUN OR START I/P FUSE BLOCK GAUGES FUSE 4 HOT IN RUN, BULB TEST OR START IGN IGN E MINI FUSE IGN SW BRAKE IND BRAKE PSI PK BRAKE 33 33 IGNITION COIL (TOP LEFT REAR OF ENGINE) IGNITION SWITCH ILLUMINATION INSTRUMENT CLUSTER LED DIMMING LEFT TURN IND LOCK OFF LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE M/T A/T PNK WIRE MALFUNC- TION INDICATOR LAMP NCA WIRE PARITY PRNDL PARK BRAKE SWITCH (ON PARK BRAKE PEDAL BRACKET) PNK WIRE PPL PPL 9 29 30 FUEL VSS VSS PPL/WHT WIRE PRNDL PRNDL A PRNDL B PRNDL C RIGHT TURN IND RUN WIRE SAFETY BELT IND SECONDARY FUEL GAUGE SENDER (IN REAR FUEL TANK) SECURITY IND SENS RTRN FUEL IN SERVICE ENGINE SOON SINGLE FUEL TANK DUAL FUEL TANKS SPEEDOMETER STARTING/CHARGING SYSTEM SUPPLEMENTAL RESTRAINTS SYSTEM TACH TAN WIRE TAN/WHT WIRE TEMP GAUGE OIL GAUGE TRANS FUSE 20 TRANSMISSION RANGE SWITCH TWISTED PAIR UNDERHOOD FUSE BLOCK UPSHIFT IND (M/T ONLY) VEHICLE CONTROL MODULE (VCM) (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT SIDE OF TRANSMISSION, LEFT SIDE OF TRAN- VEHICLE SPEED SENSOR (VSS) ADAPTER VOLTMETER WARNING SYSTEMS WHT WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 ILLUMINATION GROUND A/C DISABLE RECIRC DOOR SIGNAL IGNITION A/C COMPRESSOR CLUTCH A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE/RELAY CENTER) A/C COMPRESSOR CYCLING SWITCH (IN LOW PRESSURE LINE, ON ACCUMULATOR) A/C CTRL A/C HIGH PRESSURE CUTOUT SWITCH (ON A/C COMPRESSOR) A/C LOW PRESSURE CUTOUT SWITCH (ON A/C COMPRESSOR) A/C REQ AIR TEMP DR SENSOR MODE SIGNAL A/C SWITCH AUX FAN FUSE AUXILIARY COOLING FAN MOTOR AUXILIARY COOLING FAN RELAY (EXC 4.3L) (IN UNDERHOOD FUSE/RELAY CENTER) BATTERY IGNITION GROUND DEFOGGER ELEMENT BLK WIRE BLK/WHT WIRE BLOWER MOTOR (UNDER RIGHT SIDE OF DASH) BLOWER RESISTOR (ON BLOWER MOTOR HOUSING) BLOWER SWITCH BRN WIRE DIODE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE FRONT RECIRCULATION DOOR MOTOR (ON FRONT A/C-HEATER HOUSING) FUSE BLOCK GRY WIRE HIGH BLOWER RELAY (ON TOP OF FRONT A/C-HEATER HOUSING) HOT AT ALL TIMES HOT AT ALL TIMES UNDERHOOD BLOWER FUSE 3 FUSE BLOCK HOT IN RUN HOT IN RUN OR START HTR A/C FUSE 12 HVAC CONTROL MODULE IGN E FUSE A/C COMP FUSE LT BLU WIRE LT GRN WIRE OFF LO ORG/ WIRE PNK WIRE PPL REAR DEFOGGER SYSTEM RED WIRE SW SIG SW SIG RELAY CTRL TAN WIRE UNDERHOOD FUSE BLOCK VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) WHT WIRE YEL WIRE

39 (OR 1020) 7.4L VIN J ONLY 900 419 507 389 12 5 15 4 FUEL RET MIL IND UPSHIFT IND SPEEDO ACCY ANTI- LOCK BRAKES IND ANTI-LOCK BRAKES SYSTEM ANTI-THEFT SYSTEM BAT IND HI BEAM IND BLK WIRE BLK/WHT WIRE BRAKE IND BRAKE PRESSURE WARNING SWITCH (ON UNDERSIDE OF ELECTRONIC BRAKE CONTROL MODULE) BRN WIRE BRN/WHT WIRE CHECK GAUGES IND CHECK GAUGES LAMP DRIVER CONVENIENCE CENTER DAYTIME RUNNING LAMPS IND AIR BAG IND DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (EBCM) (ON LEFT SIDE OF ENGINE COMPT) ENGINE CONTROLS SYSTEM (FUEL PUMP BALANCE RELAY) FUEL GAUGE FUEL PUMP BALANCE MODULE (INSIDE LEFT SIDE OF FRAME RAIL) FUEL PUMP, SENDER (IN FUEL TANK) GRN WIRE GRY WIRE HEADLIGHTS SYSTEM HOT IN RUN OR START I/P FUSE BLOCK GAUGES FUSE 4 HOT IN RUN, BULB TEST OR START IGN IGN E MINI FUSE IGN SW BRAKE IND BRAKE PSI PK BRAKE 33 33 IGNITION COIL (TOP LEFT REAR OF ENGINE) IGNITION SWITCH ILLUMINATION INSTRUMENT CLUSTER LED DIMMING LEFT TURN IND LOCK OFF LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE M/T A/T PNK WIRE MALFUNC- TION INDICATOR LAMP NCA WIRE PARITY PRNDL PARK BRAKE SWITCH (ON PARK BRAKE PEDAL BRACKET) PNK WIRE PPL PPL 9 29 30 FUEL VSS VSS PPL/WHT WIRE PRNDL PRNDL A PRNDL B PRNDL C RIGHT TURN IND RUN WIRE SAFETY BELT IND SECONDARY FUEL GAUGE SENDER (IN REAR FUEL TANK) SECURITY IND SENS RTRN FUEL IN SERVICE ENGINE SOON SINGLE FUEL TANK DUAL FUEL TANKS SPEEDOMETER STARTING/CHARGING SYSTEM SUPPLEMENTAL RESTRAINTS SYSTEM TACH TAN WIRE TAN/WHT WIRE TEMP GAUGE OIL GAUGE TRANS FUSE 20 TRANSMISSION RANGE SWITCH TWISTED PAIR UNDERHOOD FUSE BLOCK UPSHIFT IND (M/T ONLY) VEHICLE CONTROL MODULE (VCM) (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT SIDE OF TRANSMISSION, LEFT SIDE OF TRAN- VEHICLE SPEED SENSOR (VSS) ADAPTER VOLTMETER WARNING SYSTEMS WHT WIRE YEL WIRE

A/C COMP FUSE AUX FAN FUSE AUXILIARY COOLING FAN MOTOR AUXILIARY COOLING FAN RELAY (IN UNDERHOOD FUSE/RELAY CENTER) BLK WIRE DK BLU WIRE HOT AT ALL TIMES HOT IN RUN OR START ORG/ WIRE RED WIRE RELAY CTRL UNDERHOOD FUSE BLOCK VEHICLE CONTROL MODULE (LEFT REAR OF ENGINE COMPT)

A.I.R. SOLENOID CHECK VALVE A/C COM- PRESSOR LOW CUTOUT SWITCH A/C COMPRESSOR CLUTCH AIR INJECTION REACTOR PUMP (7.4L ONLY) AIR PUMP MOTOR APPROX 10 CM FROM TRANSFER CASE RELAY BREAKOUT) BLK WIRE BLK/ WHT WIRE BLK/WHT WIRE BRAKE PRESSURE WARNING SWITCH CRUISE EVO CONTROL PASSLOCK MODULE MODULE DATA LINK CONNECTOR DIESEL DK GRN WIRE ELECTROCHROMIC LEFT REARVIEW ILLUMINATED MIRROR VANITY W/ COMPASS MIRROR ELECTRONIC BRAKE CONTROL MODULE EXCEPT UTILITY FRONT AXLE ACTUATOR FRONT AXLE TRANS ACTUATOR RANGE SWITCH FUEL HEATER FUEL PUMP A/C RELAY COMPRESSOR PRESSURE SWITCH FUSE BLOCK GASOLINE HEATED OXYGEN SENSOR BANK 1 SENSOR 1 HEATED OXYGEN SENSOR BANK 1 SENSOR 2 IGNITION CONTROL MODULE A/C COMPRESSOR CYCLING SWITCH INFLATABLE RESTRAINT FRONT END SENSOR INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE INSTRUMENT CLUSTER LOW COOLANT GLOW LEVEL PLUG SENSOR RELAY MASS AIRFLOW SENSOR PARK/ NEUTRAL POSITION SWITCH RIGHT ILLUMINATED VANITY MIRROR ROOF MARKER LAMPS STARTER STOPLAMP RELAY RELAY TRANSFER CASE RELAY TRANSFER CASE SHIFT CONTROL MODULE TRANSFER CASE SHIFT SWITCH UNDERHOOD UNDERHOOD FUSE BLOCK UNDERHOOD FUSE BLOCK A/C COMPRESSOR CLUTCH RELAY VEHICLE CONTROL MODULE VEHICLE SPEED SENSOR WATER IN FUEL FILTER WATER VALVE (UTILITY)

7.4L A/C COMP FUSE A/C COMPRESSOR CLUTCH RELAY ABS FUSE 4 AUX FAN FUSE RR DEFOG FUSE AUX PWR AUTO HEADLAP FUSE 22 AUXILIARY COOLING FAN RELAY BLK WIRE BLOWER FUSE 3 BLU WIRE BODY CONTROL MODULE (BCM) BRAKE CONTROL MODULE BREAKOUT) BRAKE LAMP RELAY UNDERHOOD FUSE BLOCK BREAKOUT GASOLINE-ENG HARN, BREAKOUT) CAMP/TRAIL FUSE CONN CONVENIENCE CENTER CTSY FUSE 3 DIODE DK BLU/WHT WIRE DRL/FOG FUSE 15 DUAL BATTERY ECM-B FUSE ELECTRONIC BRAKE CONTROL MODULE FROM LT GRN 6-PIN WIRE FRONT REAR DOME DOME LAMPS LAMPS FUEL PUMP OIL PRESSURE SWITCH FUEL PUMP RELAY UNDERHOOD FUSE BLOCK FUSIBLE LINK (5 GA-RUST) GARAGE OVERHEAD DOOR CONSOLE OPENER READING LAMPS GENERATOR (BASE) GENERATOR (UPLEVEL) HEADLAMP HEADLAMP AND PANEL DIMMER SWITCH HEADLAMP CONTROL MODULE HEATER MIRROR RELAY HIGH BLOWER MOTOR RELAY HORN FUSE HORN RELAY UNDERHOOD LAMP UNDERHOOD FUSE BLOCK HTD MIR FUSE HVAC CONTROL MODULE I/P COMPARTMENT BOX LAMP I/P FUSE BLOCK INFLATABLE RESTRAINT SWITCH BREAKOUT) INTERIOR LAMP CONTROL MODULE LEFT BATTERY (DIESEL) LEFT CARGO COURTESY LAMP LAMP SWITCH LEFT RIGHT VANITY VANITY MIRROR MIRROR LUXURY ONLY MEGA FUSE BLOCK NCA WIRE OR BLK 8-PIN IN-LINE WIRE ORG/ WIRE OVERHEAD FRONT CONSOLE DOME READING LAMP LAMPS PANEL DIMMER SWITCH PICKUP ONLY PK LPS FUSE 9 POWER OUTSIDE REARVIEW MIRROR SWITCH POWERTRAIN CONTROL MODULE (DIESEL) RED WIRE REMOTE BATTERY STUD RIGHT BATTERY RIGHT COURTESY LAMP RIGHT FRONT DOOR COURTESY LAMP SECURITY/ STRG FUSE 21 SEO FUSE SINGLE BATTERY (BASE) SINGLE BATTERY (UPLEVEL) SPARE POWER SOURCE STARTER MOTOR SOLENOID STOP FUSE 2 LIGHTING FUSE 8 TO FUSIBLE LINK (DIAGRAM 5 OF 5) TO UNDERHOOD FUSE BLOCK (DIAGRAM 2 OF 5) UNDERHOOD FUSE BLOCK VEHICLE CONTROL MODULE (GASOLINE) W/O REAR AUXILIARY HEATER OR A/C W/O RKE YEL WIRE

AUDIO ALARM MODULE AUDIO AMPLIFIER AUTOMATIC AUTOMATIC TRANSFER CASE AUTOMATIC TRANSFER CASE CONTROL MODULE BASE AUX/PWR FUSE 7 BASE CARGO DOOR LUXURY ONLY BATTERY FUSE 7 BLK WIRE CIG LTR FUSE 13 CIGAR LIGHTER COLUMN HARNESS BREAKOUT) CONVENIENCE CENTER DATA LINK CONNECTOR DOOR REAR LIFTGATE LOCK DOOR RELEASE CONTROL LOCK RELAY MODULE SWITCH ELECTRIC FROM UNDERHOOD FUSE BLOCK (DIAGRAM 1 OF 5) I/P CLUSTER BREAKOUT) I/P FUSE BLOCK LEFT FRONT DOOR LOCK SWITCH LIFTGATE RELEASE SWITCH LUXURY LEVEL LUXURY ONLY NON- BASE ORG/ WIRE OTHERS PICKUP PICKUPS W/O RKE POWER OUTLET BREAKOUT) PWR-ACCY CIRCUIT BREAKER A (REGULAR CAB/EXTENDED CAB/LUXURY) RADIO RADIO BATT FUSE 19 REAR AUXILIARY POWER CONNECTOR (LUXURY) REAR CONSOLE AUXILIARY POWER CONNECTOR (LUXURY) RED WIRE REMOTE CONTROL DOOR LOCK RECEIVER RIGHT FRONT LEFT FRONT POWER POWER LUMBAR LUMBAR SEAT SWITCH SEAT SWITCH RIGHT LUMBAR POWER SEAT RIGHT LUMBAR POWER SEAT SWITCH RIGHT POWER SEAT ADJUSTER SWITCH SEAT LUMBAR SWITCH BREAKOUT) STEERING COLUMN HARNESS BREAKOUT) STOP LAMP SWITCH STOP/HAZ FUSE 1 SUBURBAN/ UTILITY SWITCH T CASE FUSE 2 TO UNDERHOOD FUSE BLOCK (DIAGRAM 3 OF 5) TRANSFER CASE CONTROL MODULE TURN/ HAZARD SWITCH UNDERHOOD FUSE BLOCK VEHICLE INTERFACE UNIT W/ RKE W/BENCH SEAT

A/T M/T AIR BAG FUSE 10 BODY CONTROL MODULE BODY REAR RADIO CONTROL STEREO MODULE CONTROLLER BRN WIRE CLUTCH PEDAL PARK/NEUTRAL POSITION POSITION SWITCH SWITCH COLUMN HARN BREAKOUT) PNK WIRE CONVENIENCE CENTER CRANK FUSE 8 DAYTIME RUNNING LAMPS MODULE DK BLU WIRE ELECTROCHROMIC REARVIEW MIRROR W/ COMPASS FROM CONVENIENCE CENTER BREAKOUT) FROM IGNITION SWITCH (DIAGRAM 3 OF 5) FROM UNDERHOOD FUSE BLOCK GAS DIESEL GAUGES FUSE 4 HEADLAMP, PANEL DIMMER SWITCH I/P FUSE BLOCK IGN A FUSE 6 IGN B FUSE 5 IGNITION SWITCH INFLATABLE RESTRAINT I/P MODULE SWITCH (PICKUP) INFLATABLE RESTRAINT SENSING, DIAGNOSTIC MODULE INTERIOR LAMP CONTROL MODULE OR REMOTE CONTROL DOOR LOCK RECEIVER LOCK OFF LUXURY LUXURY ONLY M/T M/T A/T ORG/ WIRE OTHERS PNK WIRE POWER WINDOW MASTER SWITCH PPL PWR WDO CIRCUIT BREAKER RADIO BATT FUSE 17 REAR WINDOW LOCKOUT SWITCH (4-DR) RED WIRE RR WIPER FUSE 23 TRANS FUSE 20 WIPER FUSE 11 RUN WIRE STARTER RELAY TO UNDERHOOD FUSE BLOCK (DIAGRAM 4 OF 5) PNK WIRE TO UNDERHOOD FUSE BLOCK (DIAGRAM 5 OF 5) TRANSFER CASE SELECT SWITCH TURN B/U FUSE 16 UNDERHOOD FUSE BLOCK VEHICLE RIGHT FRONT INTERFACE POWER UNIT WINDOW SWITCH (2 DR, UTILITY) VEHICLE SPEED SENSOR BUFFER (DIESEL) W/O RKE W/ RKE WHT WIRE WINDSHIELD WIPER INSTRUMENT MOTOR CLUSTER MODULE YEL WIRE

5.0L, 5.7L 6.5L 7.4L 7.4L W/ CALIFORNIA EMISSIONS OTHERS A/C CLUTCH RELAY A/C COMPRESSOR CLUTCH RELAY AIR RELAY BALANCE MODULE BREAKOUT) CRANK- SHAFT POSITION SENSOR DIESEL ECM 1 FUSE EGR LINEAR PWM VALVE SOLENOID EGR SOLENOID ENG 1 FUSE ENGINE SHUTOFF SOLENOID FROM EBCM BREAKOUT) FROM SPLICE FUEL FUEL FUEL INJECTOR INJECTOR INJECTOR FUEL FUEL INJECTOR INJECTOR FUEL FUEL PUMP PUMP BALANCE BALANCE MODULE RELAY FUEL HEATER FUEL IGNITION CRANK- INJECTOR CONTROL SHAFT MODULE POSITION SENSOR FUEL INJECTOR FUEL SOLENOID DRIVER GLOW PLUG RELAY IGN E FUSE IGNITION COIL IGNITION CONTROL MODULE MASS AIRFLOW SENSOR PNK (ENG HARN, 26 CM FROM EBCM BREAKOUT) WIRE PNK WIRE POWERTRAIN CONTROL MODULE UNDERHOOD FUSE BLOCK VEHICLE CONTROL MODULE WASTE GATE SOLENOID WATER IN-FUEL SENSOR

AUTOMATIC TRANSFER CASE CONTROL MODULE AUTOMATIC TRANSFER CASE ONLY AUTOMATIC TRANSFER CASE SELECT SWITCH AUXILIARY AUXILIARY TEMPERATURE HIGH BLOWER DOOR MOTOR MOTOR RELAY AUXILIARY BATTERY AUXILIARY BATTERY RELAY (LEFT REAR OF ENGINE COMPT) AUXILIARY HEATER/ A/C CONTROL LOGIC MODULE AUXILIARY HEATER/ A/C CONTROL MODULE (FRONT) AUXILIARY HEATER/ A/C CONTROL MODULE (REAR) AUXILIARY MEDIUM BLOWER MOTOR RELAY BLK WIRE BLK/RED WIRE BLU WIRE BRAKE FUSE 18 BREAKOUT) BRN WIRE COLUMN HARNESS BREAKOUT) CONVENIENCE CENTER CROSSBODY HARN, 20 CM FROM SDM BREAKOUT) CRUISE CONTROL MODULE (GAS ONLY) CRUISE CONTROL SWITCH CRUISE FUSE 6 ELECTRONIC BRAKE CONTROL MODULE FROM BREAKOUT TO GROUND AT LEFT SIDE FRAME RAIL, NEAR CROSSMEMBER) FROM IGNITION SWITCH (DIAGRAM 3 OF 5) FROM UNDERHOOD FUSE BLOCK (DIAGRAM 1 OF 5) FROM UNDERHOOD FUSE BLOCK (DIAGRAM 3 OF 5) FRONT AXLE ACTUATOR FRONT HEATED SEATS FUSE FUSE 24 FUSIBLE LINK GAS, BASE MODELS DIESEL GAS, EXCEPT BASE MODELS HTR A/C FUSE 12 HVAC CONTROL MODULE I/P FUSE BLOCK LEFT FRONT FENDER) LEFT FRONT HEATED SEAT MODULE LEFT REAR HEATED SEAT MODULE LEFT REAR HEATED SEAT SWITCH LUXURY LEVEL LUXURY MODELS MODE DOOR MOTOR MOTOR RELAYS) ORG/ WIRE REAR HEATED SEATS FUSE REAR HEATER REAR HEATER W/ W/ REAR CARGO LIFT- HEATER DOORS GATE ONLY RECIRCULATION TEMPERATURE DOOR DOOR MOTOR MOTOR RED WIRE RESTRAINT SWITCH BREAKOUT) RIGHT FRONT HEATED SEAT MODULE RR HVAC FUSE 5 SEATS FUSE STOP LAMP SWITCH SUBURBAN, UTILITY ONLY TRANSFER SPARE CASE POWER SWITCH SOURCE UNDERHOOD FUSE BLOCK VEHICLE CONTROL MODULE (GAS ONLY) W/ REAR DEFROST