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)ENGINE MECHANICALSTARTERSTARTING SYSTEMON-VEHICLE TESTINGSTARTER DRAW TEST (DIESEL)
1999 GMC Forward Control 5.7 R, Automatic
Starter Draw Test (Diesel)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Starter Draw Test (Diesel)
- Disable fuel system. On "C" and "K" diesel models, remove fuel pump relay, located in underhood fuse-relay center. On "P" diesel models, disconnect fuel injection pump fuel shut off solenoid connector, located on engine, in front of throttle body.
- On all models, connect ammeter to negative battery cable. Crank engine and observe ammeter readings. If readings are more than 360 amps, replace starter assembly. If readings are less than 300 amps, replace battery cable or connections.
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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.