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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-12-2012, 05:40 PM   #21
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Your first step should be to connect a good set of jumper cables, charge both batteries with the donor car, then turn the donor car off and try to start your car, leaving the cables connected. Even with a bad cell this should allow the car to start.

I agree with the poster that said you probably have a bad batt and alternator. Continually running the battery dead has probably damaged it. Surprised you don't even get a "wuh-wuh" after charging, though. Could also be the starter. You need to do more troubleshooting, including checking voltages with the car off and running (once you get it started).
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Old 11-12-2012, 06:30 PM   #22
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get a voltmeter. yes, an external one, not the one from your dash (if you don't know what it is, search or don't worry about it).
measure voltage at the battery with the car off. It should read at least 12v. If not your battery is done. Recharging will work but the battery likely has a broken cell. Buy a new battery.
Put it the new battery, measure voltage with the car off. Should read at least 12v. Start the car, measure again; should read at least 14v. If you do NOT see 14v, your charging system needs attention.
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Old 11-12-2012, 07:41 PM   #23
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ok so i came home and connected a car to it and tried and i got a little closer but it didn't want to crank all the way over. im going to try a volt meter next will any one do? i have small one i bought from harbor freight not to long ago. will that work?
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Old 11-12-2012, 07:50 PM   #24
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A cheap voltmeter will work just as well in this instance as an expensive one.
But Sounds like your battery has failed.
Need new battery and then make sure your alternator is charging adequately.

Last edited by Stinger9; 11-12-2012 at 07:51 PM.
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