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)ELECTRICALCOMPONENT LOCATIONSELECTRICAL COMPONENT LOCATORMISCELLANEOUS
1999 GMC Forward Control 5.7 R, Automatic
Electrical Component Locator: Miscellaneous
1999 GMC Forward Control 5.7 R, AutomaticSECTION Miscellaneous
MISCELLANEOUS
| Component | Component Location |
|---|---|
| Data Link Connector (DLC) (Commercial Van) | Below dash, near steering column. See Figure. |
| Distributor (4.3L VIN W) | On top rear of engine. |
| Distributor (5.7L VIN R) | On top rear of engine. |
| Distributor (7.4L VIN J) | On top rear of engine. |
| Engine Firewall Relay Bracket | Left rear of engine compartment, under battery junction block. |
| Fuel Filter/Manager (6.5L VIN F) | Rear of the intake manifold, part of the fuel/water separator. See Figure. |
| Fuel Filter/Manager (6.5L VIN Y) | Rear of the intake manifold, part of the fuel/water separator. See Figure. |
| Fuel Heater (6.5L VIN F) | Rear of the intake manifold, part of the fuel/water separator. See Figure. |
| Fuel Heater (6.5L VIN Y) | Rear of the intake manifold, part of the fuel/water separator. See Figure. |
| Fuel Pump Prime Connector (Commercial Van) | Taped to fuel pump relay breakout. See Figure. |
| Fuel/Water Separator (Filter) (6.5L VIN F) | On rear of intake manifold. |
| Fuel/Water Separator (Filter) (6.5L VIN Y) | On rear of intake manifold. |
| Glow Plugs (6.5L VIN F) | On cylinder heads, below valve covers. |
| Glow Plugs (6.5L VIN Y) | On cylinder heads, below valve covers. |
| Ignition Coil (4.3L VIN W) | On top right side of engine. See Figure. |
| Ignition Coil (5.7L VIN R) | On top right side of engine. See Figure. |
| Ignition Coil (7.4L VIN J) | On bracket at rear of intake plenum. |
| Remote Battery Access Terminal Block | Rear of right radiator core support panel. |
| Secondary Battery | On right side of frame rail, behind engine. |
RENDER: 1.0x
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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.