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Old 03-22-2009, 10:26 PM   #1 (permalink)
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NWS Need help on 03 M3 charging sys

I have problem with the battery on my m3. car does not start after leave it overnight eventhough the battery is fully charged. please help me trouble shoot this problem. I just have this car for 1 month. I know nothing about it.
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Old 03-22-2009, 10:37 PM   #2 (permalink)
OMFG another one!?
 
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Have you checked the fuel system (pump and fuse)?
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Old 03-22-2009, 10:44 PM   #3 (permalink)
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03 m3

I think that it does not have to do with the fuel..I would think that either the battery is bad or the alternator...but I dont know what to do
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Old 03-22-2009, 10:46 PM   #4 (permalink)
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what about the fuse? which fuse?
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Old 03-22-2009, 10:53 PM   #5 (permalink)
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Well I'd just check all the fuses. Are you saying that the cranking gives out quickly? Cause a fuel good system, most cars will start with just a few cranks.
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Old 03-22-2009, 10:59 PM   #6 (permalink)
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the fuel system is working properly, but seems that the battery does not have enough power to start
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Old 03-22-2009, 11:06 PM   #7 (permalink)
OMFG another one!?
 
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Something is sapping power from the battery over time. Not an easy issue to hunt down.
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