2006 BMW 530xi Q&A

2006 BMW 530xi Question: Battery keeps draining

My service tech said my battery is not charging due to short drive times and low MPH avg. I charge battery to 100% w/charger and it still will go dead over 3 days. I get the feeling there is an electrical drain via the tailgate/else where. Battery load test is fine. I get about 7-8 starts before its drained. -
Answer 1
Your feelings are justified, something doesn't sound right. If the battery is good and the alternator is charging OK, then the battery shouldn't go dead from a few days of short driving. I suggest you take this to another shop or to another mechanic at the same shop, but get another person to look at this. -
Answer 2
Friend's 530 had this problem secondary to a blocked drina in the sun rood ..lleading to a shorted wiring harness -
Comment 1
530 xi wagon both sides in rear storage/battery compartments have water in them. Will look for clogged sun/moon roof drain. does any one know were they are? -