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Old 01-08-2013, 08:29 PM   #15
taibinhvuong
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Join Date: Mar 2006
Location: San Francisco
Posts: 713
My Ride: E46 99' 328i
The numbers looked normal to me except that the alternator should not need to take time to reach its max 14.1V, but don't just assume that the alternator is bad yet, it could be either one, a weak or bad battery could also load down your alternator charging voltage to 13.7v with heater and lights on.

The easier way and proper way to troubleshoot the problem is to external recharge the battery overnight or even consider borrowing a known good battery and test it out, from there you can pin point weather the problem is the alternator or the battery, thus save you time and money.
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