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1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

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Old 08-10-2009, 01:15 PM   #1 (permalink)
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What's draining my battery?

After 1 Week at teh beach, I come back and my battery was almost dead, it wouldn't turn the engine over. I don't have any aftermarket "stuff" and the radio alarm is the only thing blinking. The Battery is 6 months old and tested "good". Any Idea what may be pulling juice?
1993 740 IL.
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Old 08-10-2009, 03:02 PM   #2 (permalink)
OMFG another one!?
 
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You sure there's no interior or trunk light stuck on?
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Old 08-10-2009, 03:26 PM   #3 (permalink)
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Yep, no light on anywhere. I actually turned the switch off so no light comes on at all when I open a door. Only the trunk light comes on and I'm pretty sure it goes off when the trunk is closed. I peeped through the backseat armrest and could not see any light. I am not too worried about it, but it is puzzling.
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Old 08-15-2009, 10:58 AM   #4 (permalink)
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my 740iL does the same thing.

any suggestions?
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Old 08-18-2009, 03:15 AM   #5 (permalink)
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Wink

when u shut-off ignition... listen for any abnormal sounds ticking, knocking humming...

Try the same thing with doors ajar, and yet again;
with doors locked.

in a darkrooms try the same thing and observe any lights that may be still on.

I have had bimmer cases where the injectors were clicking away the whole night. Ignition OFF, KEY OUT, doors locked.

a faulty fuel relay circuit was the culprit... took me MONTHS! to figure out why ;-)

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Old 08-18-2009, 09:02 AM   #6 (permalink)
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^^ Thanks for the info and I'll try your suggestions. When I turn off the ignition I sometimes hear a rhythmic buzz. The "buzz" lasts for maybe a 1/2 second and repeats every 3 seconds or so, then stops. WTF? The longest my 740 IL would sit without being cranked is maybe a weekend. It took a 10 day vacation for the battery to drain to the point it would not turn over the engine. If I never find the "gremlin" causing this it may not be an issue. It is puzzling though. Thanks again!!!
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