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 MANUALSBUICK1991LESABRE LIMITED, 4D SEDAN, 4T60/ME9REPAIR AND DIAGNOSISELECTRICALGAUGESINSTRUMENT PANEL - ANALOGTESTINGALTERNATOR INDICATOR TEST
1991 Buick LeSabre Limited, 4D Sedan, 4T60/ME9
Alternator Indicator Test
1991 Buick LeSabre Limited, 4D Sedan, 4T60/ME9SECTION Alternator Indicator Test
- If light is on when ignition is off, check for shorted alternator positive diode. If light is off with ignition on and engine off, check for burned out bulb, open light circuit or open in alternator field.
- If light comes on with engine running at speed greater than idle RPM, check alternator output. Check for loose alternator belt. Check for shorted alternator negative diode. See BENCH TESTING in appropriate ALTERNATOR article in ELECTRICAL.
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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.