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Old 09-27-2006, 08:31 PM   #1 (permalink)
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Battery Drain from fuse #9

Hi all,
I have been experiencing a dead battery after letting my 1998 540i sit for several days and did a parasitic amperage draw test to narrow it down to fuse #9. With the fuse in place I get a .91 amp draw on the battery for about 1 minute and then it drops to .64 amp. If I remove the fuse I get a .54 amp draw for 1 minute and then it drops to .17 or so.

Fuse #9 is the 'A/C Heated Washer' fuse according to the fuse panel descriptions.

Anyone have any idea what this could be? My initial thought was the FSU, but if pull the connector off the FSU with the fuse in place I get the same .91 amp reading.

Any advice greatly appreciated.

Jeff
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Old 09-27-2006, 11:46 PM   #2 (permalink)
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Make sure you are waiting 16 minutes for the bus systems to go to sleep before condemning anything. You will have high current draw until all the busses go to sleep which takes a minimum of 16 minutes. This is normal operation. if you still have excessive current draw after waiting about 20 mins to be on the safe side then let us know.
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Old 09-28-2006, 02:58 PM   #3 (permalink)
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Originally Posted by Dirty_Tool
Make sure you are waiting 16 minutes for the bus systems to go to sleep before condemning anything. You will have high current draw until all the busses go to sleep which takes a minimum of 16 minutes. This is normal operation. if you still have excessive current draw after waiting about 20 mins to be on the safe side then let us know.
Ok, will do. I did notice how pulling fuse #4 resulted in a much lower initial amperage reading, which I understood was because that fuse powers 1 or 2 of the buses. I'll recheck with all fuses for 20 minutes and then with #9 fulled for 20 minutes.

Thanks,
Jeff
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