Vehicles after change point in 1982 Perform tests with the BMW service test unit. Checking Rotor Coil for Breaks and Shorted Turns: Connect test leads for resistance test on slip rings. For 80 A alternator: 2.8 to 3.0 ohms. |  |
Checking Rotor Coil for Ground Contact: Connect test leads for resistance test on slip ring and rotor shaft. Nominal value:°° = 999 k-ohm display. Check slip rings, fine grinding if necessary - see 12 31 200.  12 31 200
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Checking Stator Coil for Ground Contact: Connect test leads for resistance test on solder point and stator (coil carrier). Nominal value: °° = 99 k-ohm display. |  |
Checking Stator Coil for Breaks: Compare resistance values of wires 1/2, 1/3 and 2/3 with an ohmmeter - they should be identical. The shorted turn test can be performed with a standard tester. |  |
Checking Negative Diodes: Connect test leads for diode test. Negative lead on cooler and positive lead on one of the negative diode connections. Display with perfect condition diodes: polarity "-". Checking Positive Diodes: Connect negative lead on B + connection pin and positive lead on one of the positive diode connections. Display with perfect condition diodes: polarity "+". |  |
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