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Old 10-07-2013, 04:07 PM
Dex5 Dex5 is offline
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Location: Atlanta
Join Date: Jun 2013
Posts: 12
Mein Auto: 2004 X5
Originally Posted by bmwoem1 View Post
It's the alternator overcharging when it gets hot. It will test good until you check it when the problem is actually occurring. The whining sound can also be caused by excessive AC voltage in the audio electronics. The batteries you are replacing are getting cooked by the overcharging alternator. At the very least, replace the alternator voltage regulator if you don't want to spend the money on a whole new one

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I will have that checked out as the culprit. Thank you soo much for your insight. I will keep you posted on how it turns out.
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