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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 08-25-2004, 03:32 PM   #1 (permalink)
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I'd be behold'n to any of your expert advice on the basic first steps to isolate a very slow battery drain problem. ('87 325)

Right now there are no obvious things like lights left on.

Thanks for the help in advance.
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Old 08-25-2004, 08:14 PM   #2 (permalink)
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Is there an alarm? Has the radio been rewired to by pass ignition switch? :wink
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Old 08-26-2004, 10:29 AM   #3 (permalink)
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i Had a simular problem but it turns out i had bad ground i am not sure if that would drain the battery but it would effect the starting of teh car
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Old 08-26-2004, 10:36 AM   #4 (permalink)
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No alarms other than the ABS light coming on after starting. What I'm looking for is whether I need to do step by step pulling of fuses, using a voltmeter, etc.
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Old 08-26-2004, 12:15 PM   #5 (permalink)
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Disconnect the negative battery lead from the battery. Take a ammeter (I use a multi meter) and hook it up between the negative battery cable clamp and the negative battery post. If you see mre than about 200ma, start removing and replacing fuses (one at a time) until the current draw drops and you now have located the offending system. I would continue the drill using all fuses to be sure there is not more than one system over drawing current.
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Old 08-26-2004, 12:55 PM   #6 (permalink)
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Fantastic Bear! I'm sure this type of info will help others besides me. Once I identify the offending fuse/systems what are the next logical steps?
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Old 08-26-2004, 04:23 PM   #7 (permalink)
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check the fuses with ... fuk i 4got wat its called...it has a lgith in side of it and looks liek a screwdriver with a really pointy tip and it has a ground wire comming off it...hmm ill try and get the name of the tool
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Old 08-26-2004, 04:24 PM   #8 (permalink)
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Quote:
Originally posted by Slvr E30iS@Aug 26 2004, 05:03 PM
check the fuses with ... fuk i 4got wat its called...it has a lgith in side of it and looks liek a screwdriver with a really pointy tip and it has a ground wire comming off it...hmm ill try and get the name of the tool
um you pull the fuse and look at it...you can tell if its blown HOMESLICE lol and its an Ohm meter BTW i doubt fuses have anything to do with this but its worth a shot
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Old 08-26-2004, 04:32 PM   #9 (permalink)
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it works :-/
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Old 08-26-2004, 04:39 PM   #10 (permalink)
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Yes, the fuses themselves are fine. It's the systems the fuse serves is the problem.

I'm really looking for the next steps to isolate the exact device causing the drain (fan, light, tach,...)
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Old 08-26-2004, 04:42 PM   #11 (permalink)
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Quote:
Originally posted by Carbarns@Aug 26 2004, 05:19 PM
Yes, the fuses themselves are fine. It's the systems the fuse serves is the problem.

I'm really looking for the next steps to isolate the exact device causing the drain (fan, light, tach,...)
yup thats the next step i would go for
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