Share this

GMC Topkick (2007) - 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: 2007

Instrument Panel Fuse Block

There are two instrument panel fuse blocks located behind the instrument panel on the passenger’s side of the vehicle.

GMC Topkick - fuse box - instrument panel (box 1)

GMC Topkick - fuse box - instrument panel (box 2)

Circuit Breaker Usage
1 Stoplamps
2 Center High-Mounted Stoplamp
3 Parking Lamps
4 Powertrain Control Module
5 Auxiliary Wiring
6 Heater/Air Conditioning
7 Hazard Warning Flashers
8 Power Post
9 Courtesy Lamps
10 Warning Lights, Gages and Indicators
11 Starter
12 Rear Axle/Four-Wheel-Drive
13 Trailer Turn Signals/Hazard Warning Flashers
14 Radio/Chime
15 Daytime Running Lamps
16 Airbag System
17 Exterior/Interior Lamps
18 Parking Brake
19 Accessory Power
20 Ignition 4
21 Sidemarker Lamps
22 Turn Signal/Backup Lamps
23 Transmission
24 Hydraulics/Air Brake
A Spare
B Spare

 

Fuse Usage
Blanj Not Used
RT PRK Passenger’s Side Parking Lamps
Blank Not Used
Blank Not Used
LT PARK Driver’s Side Parking Lamps
RT REAR TRN/STOP Passenger’s Side Rear Turn Signal/Stoplamp
LT REAR TRN/STOP Driver’s Side Rear Turn Signal/Stoplamp
RADIO Radio
Blank Not Used
Blank Not Used
PWR WNDW Power Windows

 

Relay Usage
ECU/PTO* Engine Control Unit/Power Take-Off *Diesel 7.8 DURAMAX®
BRK LAMP C4/C5 Brake Lamps, C6/C7/C8 Tractor/Trailer Wiring
DRL Daytime Running Lamps
IGN-4 Ignition
CHMSL Center High Mounted Stop Lamp
MRK LTS Sidemarker and Clearance Lamps
HTD/MIRR Heated Mirrors
HTR Diesel Heated Fuel
RT TRN TRLR Passenger’s Side Trailer Turn Signal
Blank Not Used
LT TRN TRLR Driver’s Side Trailer Turn Signal
Blank Not Used
Blank Not Used
Blank Not Used

Underhood Fuse Block

Fuse blocks are located in the engine compartment, on the passenger’s side of the vehicle.

Primary Underhood Fuse Block

GMC Topkick - fuse box - engine compartment (primary box)

Fuse Usage
RR DEFOG Rear Defog
ENG 1 Engine 1
ENG 3 Engine 3
PCM-B Powertrain Control Module
BLANK Not Used
ENG 4 Engine 4
ENG 2 Engine 2
HTD FUEL Heated Fuel
BLANK Not Used
BLANK Not Used
02A Emissions
A/C COMP Air Conditioning Compressor
ABS 1 Anti-lock Brake System 1
ABS 2 Anti-lock Brake System 2
ABS 3 Anti-lock Brake System 3
ENGINE Engine
E/A PUMP Electronic/Automatic Pump
HORN Horn
NOTE 2 L18 Fuel, LG4 Powertrain Control Valve, LG5 Electronic Control Module
NOTE 3 L18 Fuel, LG4 Powertrain Control Valve, LG5 Electronic Control Module
STUD A Spare
STUD B Spare

 

Relay Usage
NOTE 1 LG4 Powertrain Control Valve, L18 Fuel Pump, LG5 Heated Fuel
IGN B Ignition
STARTER Starter
HORN Horn
IGN A Ignition
PTO/ECU* Power Take-Off/Engine Control Unit *Diesel 7.8L DURAMAX®™
REVERSE Reverse
NEUTRAL START Neutral Start

Secondary Underhood Fuse Block

GMC Topkick - fuse box - engine compartment - (secondary box)

Fuse Usage
IGN 1 Four-Wheel Drive Module
IGN 4 Ignition 4
IGN 3 Ignition 3
BATT/HAZ Battery/Hazard Warning Flashers
HEADLAMP Headlamps
LIGHTING Interior/Exterior Lamps
HVAC Climate Control System
NOTE C4/C5 Electric Brake, C6/C7/C8 Brake Lamps

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

Still have questions or want to supplement the article? Discuss On Telegram


Access the private club

Become a member of Fuses.guru and get access to our private telegram bot. Accelerated access and smart search of fuse box & wiring diagrams.
P.S. We never spam!

May Be Useful