2003 M3 Battery Problem

2003 M3 Battery Problem

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Discussion

D20903

Original Poster:

3 posts

202 months

Thursday 17th January 2008
quotequote all
Folks,

Hoping some one might be able to shed some light on a problem I'm having with a 38k mile '03 M3(FBMWSH).

Red battery light came on yesterday; drove car for ~30mins, towards the end of the journey the radio switched itself off & all dashboard warning lights came on (same as ignition). Got back to office, turned the engine off & tried to restart it; nothing there.

Manual says that the red battery warning light means theres a problem with either the 'V-belt' or the alternators charging circuit. Had a quick look under the bonnet, belt appears fine & the alternator connections are firm. Multimeter across the battery terminals with the engine running confirms that there is no charge getting to the battery (11 Volts).

Has anyone experienced a similar problem/be able to point me in the right direction? Is there a regulator/electronics that are known to fail?


E36GUY

5,906 posts

224 months

Thursday 17th January 2008
quotequote all
Alternator connections may be ok as may be the belt but it doesn't mean that the alternator is working. Maybe it's the unit at fault. Ballache