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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 12-21-2010, 09:00 AM   #1 (permalink)
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bmw 520i 1990 flat battery

Hello,

My BMW 520i 1990 keeps getting a flat battery if I leave the car parked up for several days.

I replaced the battery but it still continues going flat. I removed one of the terminals and put an amp meter across the battery and the terminal and I can see something is pulling about 400mili-amps, I removed all the fuses and relays but its still its pulling about 400ma

anyone have any ideas what could be draining the battery while everything is supposedly turned off? How can I make further diagnosis?

Thanks
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Old 12-22-2010, 08:06 AM   #2 (permalink)
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Welcome to the Werkz.

Is it possible that you have a wire within the loom between the battery and fuse area that may have a slight breech in its insulation? Are you sure you've pulled all of the fuses?
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Old 12-22-2010, 10:03 AM   #3 (permalink)
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Originally Posted by brettski View Post
Welcome to the Werkz.

Is it possible that you have a wire within the loom between the battery and fuse area that may have a slight breech in its insulation? Are you sure you've pulled all of the fuses?

Yes I pulled out all the fuses and relays and as far as I can see the battery cables have good insulation. I even completely removed the dvd player as it was not standard.

Are there by any chance more fuses located anywhere other than the engine fuse box?

Thanks
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