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Old 11-23-2012, 04:12 PM   #27
Banned User
Join Date: Apr 2008
Location: Dallas, TX
Posts: 2,217
My Ride: E30-E46-E90-E90M-F30
you need to find out whether you have a bad battery or alternator. finding out is very easy. all you need is a voltmeter.

crank the car. with engine running....measure the battery. the battery should read anything about 13-14volts. if so then your alternator is good. turn off car....measure battery. if battery is below 12 volt then you have a bad battery.

hope this helps. good lucj
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