GMC TopKick Fuse Box: What Each Fuse Does
From the 2010 GMC TopKick owner's manual. 1 fuse box listed.
Secondary Underhood Fuse Block
Location: Engine compartment, on the passenger side of the vehicle
| Fuse | Circuit |
|---|---|
| IGN 1 | Ignition 1 |
| 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 |
Source: owner's manual, PDF page 292.
Listings are copied as text from the manual's fuse tables (AI-assisted; every circuit name was matched against the cited pages 2026-10-18). Fuse layouts can differ by trim and year; check the label on the fuse box cover before replacing a fuse, and always use the same amp rating.
Confirm with your own manual, dipstick or door-jamb label.
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