The answer is yes... an alternator is a three phase device and one phase can be defective while the other two continue to operate. The diodes that make up the rectifier section are normally to blame for the failure. There are six diodes and if one fails, you can get partial charging and battery drain problems like you are experiencing...
Quote:
Originally posted by shane254
can you alternator drain your battery when not running if it still charges when it is running
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