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.
1999 GMC Forward Control 5.7 R, AutomaticFACTORY OEM SERVICE PROCEDURE
Component Locations
COMPONENT LOCATIONS
| Component | Location | ||
|---|---|---|---|
| "C" & "K" Series | |||
| Clutch Pedal Position (CPP) Switch | Top Of Clutch Pedal | ||
| Instrument Panel Fuse Block | Lower Left Side Of Instrument Panel | ||
| Ignition Switch | Under Instrument Panel, On Steering Column | ||
| Remote Battery Stud | At Underhood Fuse-Relay Center | ||
| Starter Relay | In Underhood Fuse-Relay Center | ||
| Transmission Range Switch | Left Side Of Transmission | ||
| Underhood Fuse-Relay Center | Left Side Of Engine Compartment, Near Battery | ||
| "G" Series | |||
| Battery | Underhood, Left Side | ||
| Auxiliary Battery (If Equipped) | Left Frame Rail, Center Of Vehicle | ||
| Battery Junction Block | Right Side Of Engine Compartment, Near Radiator | ||
| Glow Plug Relay | Top Right Side Of Engine | ||
| Instrument Panel Fuse Block | Lower Left Kick Panel | ||
| Park Neutral Position (PNP) Switch | Left Side Of Transmission | ||
| Starter Relay | Underhood Fuse-Relay Center | ||
| Underhood Fuse-Relay Center | Above And Left Of Battery | ||
| "L" & "M" Series | |||
| Battery | Underhood, On Left Side | ||
| Ignition Switch | Upper Right Side Of Steering Column | ||
| Instrument Panel Fuse Block | Lower Left Side Of Dash, Next To Left Kick Panel | ||
| Park Neutral Position (PNP) Switch | Left Center Of Transmission | ||
| Starter Enable Relay | Underhood Fuse-Relay Center | ||
| Underhood Fuse-Relay Center | Near Battery | ||
| "P" Series | |||
| Battery Junction Block | Left Side Of Engine Bulkhead, Above Relay Bracket | ||
| Clutch Pedal Position Switch | Left Side of Brake Pedal Bracket | ||
| Crank Fuse | |||
| Commercial Van | In-Line Fuse, Right Side Of Steering Column | ||
| Motorhome | Auxillary Fuse Block | ||
| Park Neutral Position (PNP) Switch | Left Side Of Transmission Near Bellhousing | ||
| Starter Relay | |||
| Commercial Van | On Relay Bracket, Under Battery Junction Block | ||
| Motorhome | Engine Wiring Harness Junction Block | ||
| Fusible Links | Near Starter Solenoid & Engine Wiring Harness Junction Block | ||
| "S" & "T" Series | |||
| Clutch Pedal Position & Cruise Control Shutoff Switch | On Clutch Pedal Support Bracket | ||
| Instrument Panel Fuse Block | Left Side Of Instrument Panel | ||
| Park Neutral Position (PNP) Switch | Left Side Of Automatic Transmission | ||
| Starter Relay | Underhood Fuse-Relay Center | ||
| Underhood Fuse-Relay Center | Left Front Fenderwell | ||
| "U" Series | |||
| Fusible Link "A" & "Z" | Bolted To Starter Solenoid | ||
| Fuse Block | Right Side Of Instrument Panel, In Right Front Door Opening | ||
| Ignition Switch | Part Of Steering Column | ||
| Powertrain Control Module (PCM) | Engine Compartment, In Air Cleaner Assembly | ||
| Park Neutral Position (PNP) Switch | Left Rear Side Of Engine Compartment, On Transaxle | ||
| Underhood Electrical Center | Engine Compartment, Front Of Right Wheelhouse, Above Battery | ||
Factory Service Tools
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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.
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