Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSELECTRICAL COMPONENT LOCATIONSELECTRICAL COMPONENT LOCATORCIRCUIT PROTECTION DEVICES
1999 GMC Forward Control 5.7 R, Automatic
Circuit Protection Devices
1999 GMC Forward Control 5.7 R, AutomaticSECTION Circuit Protection Devices
CIRCUIT PROTECTION DEVICES
| Component | Component Location |
|---|---|
| Accessory Junction Block (School Bus) | Body builder installed. |
| Battery Junction Block (Commercial Van) | On left side of firewall, above relay bracket. See Figure. |
| Crank Fuse (Commercial Van) | On upper right side of steering column support. See Figure. |
| Crank Fuse (Motor Home) | In auxiliary fuse block, right of steering column. |
| Diode Network | On I/P harness (body builder installed). |
| I/P Fuse Block | Behind dash panel (body builder installed). |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.