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E12, E28, E34, E39, E60 General discussion and technical help for all year 5 series cars.

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Old 04-23-2007, 06:09 PM   #1
tezmanian

Name: tezmanian
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Your Ride: 1995 530
03 540 Electrical Failure

5 days after 3-year anniversary dealer check-up and warranty expiration date, car wouldn't crank. Towed to dealer. Dealer replaced battery and tested charging system; said A-OK. 5 miles from dealer after picking up car, battery light came on. Returned to dealer. Dealer now says alternator has failed. Dealer replaces failed alternator. Did the failed alternator cause the battery to fail, or did the failed battery cause the alternator to fail???
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Old 04-23-2007, 06:14 PM   #2
mullethunter3
 
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I don't know if scenario #2 can happen... I've had at least 10 dead batteries in this car, soooo probably not. I would bet on your alternator killing your battery.
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Old 04-23-2007, 08:44 PM   #3
c1apton
 
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Quote:
Originally Posted by tezmanian
Did the failed alternator cause the battery to fail, or did the failed battery cause the alternator to fail???
More than likely it was the alternator, but it could go both ways. A weak battery would make the alternator work harder also.
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