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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 327 (CHARGING SYSTEM)SYSTEM TESTSTEST B: CHARGE INDICATOR ALWAYS ON
1999 GMC Forward Control 5.7 R, Automatic
Test B: Charge Indicator Always On
1999 GMC Forward Control 5.7 R, AutomaticSECTION Test B: Charge Indicator Always On
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
- If diagnostic system check was not performed, go to ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK under ON-VEHICLE TESTING. If diagnostic system check was performed, go to next step.
- Start engine. If charge indicator light illuminates, go to next step. If charge indicator light does not illuminate, problem is intermittent. Check wiring and connections.
- Connect scan tool to Data Link Connector (DLC). DLC is located under instrument panel, near steering column. Using scan tool, observe Generator light parameter in PCM data list. If parameter indicates light is OFF, go to next step. If parameter does not indicate light is OFF, go to TEST A: CHARGING SYSTEM TEST .
- Test indicator light control circuit for a short to ground. See WIRING DIAGRAMS . Repair circuit as necessary, then go to step 7 . If short to ground was not found, go to next step.
- Inspect IPC harness connector for poor connections. Repair as necessary, then go to step 7 . If connections are okay, go to next step.
- Replace Instrument Panel Cluster (IPC). See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Go to next step.
- Operate system for which symptom occurred. If condition was found and corrected, system is okay. If condition was not found and corrected, go to step 2 .
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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.