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Old 01-14-2013, 07:27 PM   #2
dmax
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Join Date: Aug 2006
Location: NJ
Posts: 23,292
My Ride: '99 328i 300K miles
Use cluster test to see if it's battery, alt, or both. The alt isn't a charger, so if you've had a bad battery for a while, the alt could go bad.

Voltage off should be around 12 V and on around 14V.

Your starter isn't an issue at all.

I'm thinking just battery, but you need to check the voltage to begin.

Search Cluster test.
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