Question about 1984 BMW 3 Series

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Battery bran new, Alternator brand new. Bat light dosent come on when key is turn on. Both Bat and Alt are checked works fine. Power test showes the Alt is recieving and sending power. The issue is the power going from the dash to the Bat to recharge the Bat. How do I find the wire and fix this problem?

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I would start at the positive terminal on the battery. Is there a separate wire to the clamp carrying the current from the alternator? It should have a fusible link in it (may not be obvious, could be just a thick spot in the wire). If the problem is not there, you will need to trace that wire forward, checking for voltage everywhere the wire is visible (poke a sewing pin through the insulation to get voltage reading)..

Posted on Mar 14, 2011

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