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)ELECTRICALBODY ELECTRICALREAR WINDOW DEFOGGERTESTINGFILAMENT TESTING
1982 Porsche 928 Automatic Trans
Filament Testing
1982 Porsche 928 Automatic TransSECTION Filament Testing
- To locate breaks in the grid wire filaments, attach a voltmeter to the middle portion of each filament. Attach the other meter probe to the vertical section of the window grid.
- If a grid is broken, the meter will register 0 volts or battery voltage. If the wire is unbroken, the meter will register approximately half battery voltage. To the locate the break, move the probe along the wire until the meter needle moves abruptly.
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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.