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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 01-04-2013, 08:36 AM   #1
bryan64
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Join Date: Jan 2013
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My Ride: 318 compact
Battery drain

Hu
Have a 318 compact e46 & bat keeps going flat is there a common fault i can check have checked and disconneted all like lights and and checked current drain whitch is at most 30 ma
help
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Old 01-04-2013, 11:39 AM   #2
zhenkaaaM3
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Are you always jump starting it? Maybe alternator is..check voltage while the car is running. With a good alternator you should be getting 13.5-14.2v
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Old 01-04-2013, 11:43 AM   #3
WDE46
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I have heard that the final stage resistor can cause this phnomenon. If yours is original, then you probably need a new one anyway. Does your climate fan act strange at all?
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Old 01-04-2013, 01:49 PM   #4
shovelit
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3o mA won't drain the battery.
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Old 01-04-2013, 01:58 PM   #5
choxor
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Most likely the only way you're going to solve this is by grabbing a multimeter and testing for parasitic draw. Have you recently installed anything; alarm, stereo, etc...
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Old 01-04-2013, 02:11 PM   #6
WDE46
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How did you check current drain? I didn't even see that part when I first replied. You should probably just get a new battery if it's more than a few years old anyway.
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Old 01-04-2013, 02:40 PM   #7
choxor
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Quote:
Originally Posted by WDE46 View Post
How did you check current drain? I didn't even see that part when I first replied. You should probably just get a new battery if it's more than a few years old anyway.
I missed it too.

OP, search for user jfoj. Check his signature.
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