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 MANUALSPONTIAC1987FIERO BASE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCHARGING SYSTEMSALTERNATOR - DELCOON-VEHICLE TESTSALTERNATOR DIAGNOSTIC TESTER SI SERIES
1987 Pontiac Fiero Base, Automatic
Alternator Diagnostic Tester Si Series
1987 Pontiac Fiero Base, AutomaticSECTION Alternator Diagnostic Tester Si Series
NOTE:
The Alternator Diagnostic Tester (J-26290) is designed as a quick check of alternator systems. It will detect about 98 percent of charging system faults.
- Turn off engine, lights and accessories. Connect Alternator Diagnostic Tester (J-26290) to alternator. See Fig 1. If tester light flashes, go to step 3). If tester light stays on, tester is at fault and should be replaced. If tester light is off, pull tester plug from alternator.
- If tester plug is pulled from alternator and tester light flashes, rectifier bridge is faulty. If tester light stays off, check for 12 volts at terminal No. 2 of harness connector. Repair wiring or terminal if zero voltage is available. If voltage is available, tester is faulty.
- Observe tester light with engine operating at fast idle (lights and accessories off). If tester light is off, charging system is okay. If tester light is on, remove alternator. Check diode trio, rectifier bridge and stator. If tester light is flashing, remove alternator and check voltage regulator, rotor field coil, brushes and slip rings.
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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.