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6 Series DIY
6 Series Do It Yourself (DIY) forum.

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  #1  
Old 01-10-2015, 12:22 PM
BETO1984 BETO1984 is offline
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Location: ORANGE COUNTY
 
Join Date: Jun 2014
Posts: 51
Mein Auto: 2005 645CI
Alternator reading below 14.0v

Hi guys, so i think im having alternator issues, due to low voltage some lights are popping out, like the passenger air bag light and the emission light, but my dilemma is if to change the alternator or just the voltage regulator? Any advice/opinions? Thanks.
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  #2  
Old 01-10-2015, 03:32 PM
HerbP HerbP is offline
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Location: Georgia
 
Join Date: Jul 2009
Posts: 3,020
Mein Auto: 2005 645Ci & 2007 750Li
The alternator should stay around 14.24 volts. The alternator sounds like it is working, & maybe the VR is having problems. Are you getting a certain sequence of lights, & are you checking the output when the warnings start going off? The VR tends to typically overcharge when failing.
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Old 01-14-2015, 08:36 PM
BETO1984 BETO1984 is offline
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Location: ORANGE COUNTY
 
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Mein Auto: 2005 645CI
Thanks herb, i think im just going to replace the whole alternator since this cars are notorious for having alternator issues.
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