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Could this have something to do with my problem? 200 1980

posted by  3 volvo guy on  Sun Mar 14 14:08 CST 2004
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last visit: Wed Mar 11 07:23 CST 2009
[RELATED]

This is another post I found regarding voltage backfeeding through the alternator. Could thsi have anything to do with my problem?

Your rectifier diodes in alternator are faulty.
Take an AC voltmeter with it running and check for AC voltage, anything over 25 millivolts AC indicates bad rectifier diodes.
One of them is shorted and when you switch off key it is backfeeding through regulator circuit to alt light wire terminal and then feeding into cluster, with key off the other bulbs all combined provode enough of a ground path to light bulb. The alternator will pass a simple voltage output test but would fail an amperage (load) test if the diode(s) is (are) faulty. The remaining 2/3 of alternator is working when one of the diodes fail. Battery will stay up unless you drive slowly and have a lot of things on like lights and fan at same time.








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