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i had noticed my ammeter dipping into the negative quite often and asked the local buick dealer to check the "new" alternator they had installed. they told me it was fine and the system was charging normally. i continued to notice the problem and when to the local parts store where they test batteries and alternators for free. battery was not able to hold a charge by their tests. so new battery gets put in and i took it back to the store to test the alternator. they show it's putting out 15 volts (!!) but only 2 to 4 amps. any suggestions?
bob
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