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Do-It-Yourself H.Q.
Share your DIY projects or ask questions about how to fix something on your own. Help fellow Bimmerfest members improve your wrench turning skills! All BMW DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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  #1  
Old 10-11-2013, 10:00 AM
Alex Pappas Alex Pappas is online now
Registered User
Location: Massachusetts
 
Join Date: Oct 2013
Posts: 35
Mein Auto: '86 325e
E30 sits a few days, loses battery charge

'86 325E 5spd. I've researched this a little bit but it doesn't seem like it's always the same problem with all the people who post about it. I am planning on just installing a toggle switch in the trunk next to the battery since it'll be more of a weekend road trip/AutoX car but if there is anyone with a strong opinion about what to chase, I'm all ears. Thanks for any input.
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  #2  
Old 11-03-2013, 04:41 PM
badvlvo badvlvo is offline
Volvo guy
Location: Bakersfield, CA
 
Join Date: Mar 2009
Posts: 49
Mein Auto: 00 z3 2.5, 04 e46 2.5
Fully charge the battery and have it tested. A defective battery can die after a couple days.
Also you can check for a small draw on the battery with even the cheapest of voltmeters if it has an amp function.

If the battery is good then you need to hook the ammeter in line with the battery and pull fuses until the load is gone. Once you isolate the circuit with the load you can isolate the draw. Be sure your dome lights, trunk lights and hood lights are OFF when testing for a draw.
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2000 Z3 2.5 manual
2004 325i auto sport package
1980 Volvo 244 (the race car)
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