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Old 02-17-2013, 09:40 PM
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RenaissanceMan RenaissanceMan is offline
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Location: nashville, tn
Join Date: Mar 2003
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Mein Auto: a few bmw's
RESOLVED: Just replaced alternator & batt light still flickers. What next???

Hey everyone-

For the last several weeks my battery light has flickered for about 2-5 seconds after starting the X5. The light always goes away after several seconds and the truck has run fine. It has always started right up without hesitation, and the battery never drained. The only other symptom was that my PDC would mysteriously turn itself on as soon as I cranked the engine (usually preceeded by a PDC light flicker for a couple of seconds). Unlocking the OBC revealed that I was holding a steady 13.9-14.1 volts while running. Did a lot of thread research here and got some helpful advice along the way... It was suggested that some component(s) inside the alternator was going South, so I decided to just replace the entire alternator.

Anyhoo, replaced the alternator today along with the belts & oil stand gasket, and when I went to start the truck, lo and behold I had the same exact symptoms as before: Flickering battery light for a few seconds immediately after cranking, and then it goes away. Still showing steady 13.9-14.1 volts. I'm assuming I didn't purchase an alternator with an identical malfunction, so now I'm thinking maybe the alternator was never bad in the first place.

Is there any possibility that my battery, even though it is holding charge and starting the truck w/o problem, could be doing something to cause this strange behavior??? I was going replace the battery next but wanted to ask the experts first. At a total loss here so any help is greatly appreciated! Thanks for reading!
'05 X5
'06 325i
'91 E30/M52 GTS2 racer
'76 2002

Last edited by RenaissanceMan; 03-04-2013 at 04:25 PM. Reason: update on resolution of problem
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