| No. | Fuse | Usage |
|---|---|---|
| 1 | IGN 1 | Ignition 1 |
| 2 | IGN 4 | Ignition 4 |
| 3 | IGN 3 | Ignition 3 |
| 4 | BATT/HAZ | Battery/Hazard Warning Flashers |
| 5 | HEADLAMP | Headlamps |
| 6 | LIGHTING | Interior/Exterior Lamps |
| 7 | HVAC | Climate Control System |
| 8 | NOTE | C4/C5 Electric Brake, C6/C7/C8 Brake Lamps |
GMC Topkick 2008 Secondary Underhood Fuse Panel / Board – Fuse Symbol Map
