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GMC T-Series mk2 (1999 - 2002) - fuse box diagram

avatar Jonathan Yarden Mar 25, 2021 · 5 min. read

In this article you will find a description of fuses and relays GMC, with photos of block diagrams and their locations. Highlighted the cigarette lighter fuse (as the most popular thing people look for).
Get tips on blown fuses, replacing a fuse, and more.

Year of production: 1999, 2000, 2001, 2002

Instrument Panel Circuit Breaker and Relay Blocks

These circuit breaker and relay blocks are located on top of the instrument panel on the passenger’s side of the cab.

Number Circuits Protected
1 Ignition Switch
2 Cigarette Lighter, Radio
3 Engine ECU (TICS)
4 Glow Relay, ESC, EVRV, Gov. Mod., Engine ECM (GAS)
5 Checker Connector (TICS), ALDL Connector
6 Meter, D.R.A.B., Warning Lamp, Engine Stop Relay, Ignition Relay, Blower Motor Relay, Auxiliary Relay, Power Window Relay, Air Intake Relay, Fuel Filter Relay, Intermittent Relay
7 Dome Lamp, Horn, Electric Parking Brake, Radio (Back-Up), MD Automatic Transmission VIM, Engine ECM (GAS), Fuel Pump, Fuel Filter
8 Power Window
9 Anti-Lock Braking System, Exhaust Brake, Back-Up Lamps, M.F.A.M., Electric Parking Brake, Air Suspension Dump, Differential Lock, Air Dry and Moisture Ejector Heater, MD Automatic Transmission, Ignition Coil, Injector, Fuel Tank Module and Pump, Generator (F), Engine ECU (TICS), Checker Connector (TICS)
10 Checker Connector (TICS)
11 Trailer Turn (LH) Lamp, ID Lamp, Marker Lamp, Clearance Lamp
12 Auxiliary (Ignition ON)
13 Auxiliary (Battery Direct)
14 Headlamp (LH)
15 Headlamp (RH)
16 Headlamp
17 Engine Stop Actuator
18 M.F.A.M., Hydraulic Brake Motor
19 Taillamp, Light MIR, Illumination Lamp
20 Cool Condenser Fan Motor, Cooler Compressor
21 Wiper Motor, Washer Motor
22 Heated Mirror, 2-Speed Axle Motor, 2-Speed Axle Relay
23 Hydraulic Brake Relay, M.F.A.M., Flasher Unit
24 Blower Motor, Air Conditioner Relay
25 Trailer Turn (RH) Lamp, Flasher Unit
26 Power Post (Consent)

Maxi-Fuse Block

Maxi-Fuse block is located outside of the cab at the rear, on the driver’s side.

Name Circuits/Circuit Breakers Protected
ST/TURN/HAZ Stoplamp, Turn Signals/Hazard Warning Flashers, Fuel, Ignition Relay (Gasoline Engines)
IGN SW3 Air Conditioner, Axle, Chassis
INT/EXT LIGHTS Parking Lamps, Dome Lamp, Instrument Panel Lights
HEAD LAMP Headlamps, Daytime Running Lamps
AUX WRG Auxiliary, Parking Brake
IGN SW1 Ignition Switch, Washer/Wiper, Crank, Radio
HYD PUMP Hydraulic Brake, Brake Pump Motor
ABS ABS Module
ELECT TRANS Ignition Relay (Diesel Engines)
PARK BRAKE Parking Brake Motor
BLOWER HORN Blower, Horn, Cigarette Lighter, Auxiliary
TRAILER ABS Trailer ABS System, Trailer Stoplamps
PWR WDO/LOCKS Power Windows, Power Door Locks

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

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