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#1
11-29-2013, 03:40 AM
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battery light on the dash comes for one reason and one reason only - disbalance of the regulator's bridge... this is how the battery light wired, not much of electronics here here, just plain electricity... however, the disbalance can be caused by several reasons... something out of balance on alt side, or something out of balance on car/battery side...
while the readings give 14V from the battery, the internal system can measure 11V, which matters more, as that is the reading taken where it matters... i repeat myself here... lol... anyways, check the alt again, and then check the battery, as bad alt can ruin an otherwise good battery...
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E53 X5 4.6iS 147K mi - Sold May 2013 Tireprints left in: USA, Nicaragua, Costa Rica, Panama, Russia  E53 X5 4.8iS built 2005-10-17 66200 mi - June 2012 96000 mi - June 2013 112000 mi - June 2014 OEM fire extinguisher OE first aid kit OE tow hitch OE TV module OE aspheric mirror K&N air filter black/white badges rear camera 4-channel video recorder Here is the list of things I have done to the X 
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#2
11-29-2013, 03:04 PM
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Update 2: I can't get in anywhere until Monday but the consensus of everyone I spoke to is that if the battery reads 14v at idle (regardless of amps) the alternator is not likely at fault and if the battery didn't lose charge overnight it likely isn't the battery either. Everyone thinks we're looking for a bad ground somewhere as others have alluded to in this thread. Guess I know what I'm doing this weekend. Will be taking it in Monday regardless to have everything load tested.
tl;dr: Search for the bad ground.
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2001 E53 4.4i M62 [10/2000] Topaz Blue / Montana Grey Sport Package / Aero Kit Winter: 255/55/18 Toyo Observe GSI-5 on Touren TR9 Summer: 255/50/19 + 285/45/19 Bald Rubber on Style 132
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#3
11-29-2013, 10:11 PM
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Problem resolved! Heading out tonight, will post full update with details for everyone soon.
Short version: Main positive connection from battery terminal was shorting. Connection arcing and was actually a pretty big fire hazard. OBC reading 13.7v now and a happy SAV!
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2001 E53 4.4i M62 [10/2000] Topaz Blue / Montana Grey Sport Package / Aero Kit Winter: 255/55/18 Toyo Observe GSI-5 on Touren TR9 Summer: 255/50/19 + 285/45/19 Bald Rubber on Style 132
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#4
11-30-2013, 10:56 AM
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I had a similar issue. Replaced my alternator 3 times in one week before I got a good one that actually put out steady voltage. The first one I installed was great for 3 days, then the battery light, followed by the ABS, Brake, 4x4 and Self Level inactive. Replaced it under warranty and the second one held a great power output, but whined severely. Replaced it again under warranty and so far so good.
Also, have you looked in the area of the alternator for fluid leakage? If you have a power steering leak (can spray on to alternator) or oil leak near the alternator the power steering fluid or engine oil can cause the alternator to go haywire. edit: oops, guess I should have looked on page 2 before posting.
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Current Bimmer 2004 X5 4.4i Sterling Grey Sport/Premium Past Bimmers 1991 318I Alpine White 1995 740I Alpine White 1991 525I Schwartz 1998 323IS Scwartz 2004 330CI Cabrio Titanium Silver Metallic 1995 540I Schwartz 2000 Z4 3.0 Titanium Silver 2000 330ci Coupe Titanium Silver
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