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 MANUALSPORSCHE1982928 AUTOMATIC TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCHARGING SYSTEMSALTERNATORS - BOSCHOVERHAULTESTING AND REPAIRINGDIODE ASSEMBLIES
1982 Porsche 928 Automatic Trans
Diode Assemblies
1982 Porsche 928 Automatic TransSECTION Diode Assemblies
- Test diodes with tester before dismantling slip ring and end frame. DO NOT lay positive diode carrier on housing or a false reading will be obtained. Disconnect conductor from "D+" to exciter diodes at heat sink.
- Unscrew spring and brush holder and remove from alternator. Unsolder stator lead and negative diode connections. Unscrew exciter diodes heat sink and remove together with positive diodes heat sink. Clean all components with trichlorethylene prior to further testing.
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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.