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 MANUALSBMW1992850I AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALCHARGING SYSTEMSGENERATORS & REGULATORSBENCH TESTINGDIODE ASSEMBLY
1992 BMW 850i Automatic
Diode Assembly
1992 BMW 850i AutomaticSECTION Diode Assembly
- Place DVOM on x100 scale. Connect DVOM leads, in turn, between B+ terminal and each stator terminal. See Fig 1. Reverse leads. DVOM should indicate continuity in one direction only.
- Connect DVOM leads, in turn, between negative plate and each stator terminal. Reverse leads. DVOM should indicate continuity in one direction only.
- Connect DVOM leads, in turn, between D+ terminal and each stator terminal. Reverse leads. DVOM should indicate continuity in one direction only. Replace diode assembly if continuity is not as specified.
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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.