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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 11-26-2013, 04:49 PM
Leekay07 Leekay07 is offline
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Location: Stillwater NY
 
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Mein Auto: X5 35D, Former X1 and 335
Alternator dying on my 08 at 159,000



I had them check the battery last week they said its fine they registered the Battery again @ $55 and still my battery is drained to the point its dead.

I replaced the pulleys as preventative measure 18 months ago.
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Last edited by Leekay07; 11-26-2013 at 04:50 PM.
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  #2  
Old 11-26-2013, 05:05 PM
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fun2drive fun2drive is offline
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Location: Panhandle of Florida
 
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Mein Auto: 335 vert//M3/4/ 13Outback
First of all get a DMM and measure the voltage with engine off. Should be 12.6VDC for a fully charged battery. Once the engine is started monitor the voltage going to the battery using the battery terminals. It should gradually ramp up to 14.5VDC. This would demonstrate you have a properly working alternator and that the IBS is giving good information to the DME to modulate the power going to the battery. If these don't check out and the voltage isn't ramping up you do have an issue. However the other real possible is a parasitic draw on your battery. Also how was the battery checked and determined to be fine? The only way I know to test a battery is to put a load tester on it.

Parasitic drag
Use the DMM in the amp setting and disconnect the battery post. One lead on the post and one lead on the battery cable. Set the DMM to milli-amps. It takes a while for the car to settle down and you will need to unplug the rear lights in the trunk. Once the car goes to sleep it should not draw more than 0.040 A or you have a draw coming from someplace else that should not pull power..
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Old 11-26-2013, 05:07 PM
Leekay07 Leekay07 is offline
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Location: Stillwater NY
 
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Mein Auto: X5 35D, Former X1 and 335
Well BMW pulled the battery put it on a tester and said the cells are good and it was charging fine.

My problem is I work nights and because its winter my im driving with lights, heater and what not on so I know my alternator is probably the issue here. Not putting out enough power I have removed all none car attached power draws. including ipod charger, phone charger and radar detector.
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Last edited by Leekay07; 11-26-2013 at 05:10 PM.
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Old 11-26-2013, 07:06 PM
Pilgrim Pilgrim is offline
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Mein Auto: 2009 328iX Coupe
Then have your charging system tested to assure it's performing correctly. You should be able to have evry electrical device on the car going full blast and never exceed the capacity of the alternator.
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Old 11-27-2013, 12:57 AM
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sptt144 sptt144 is offline
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Mein Auto: 2009 335i
Is it not starting easily? If battery is OK and not dying, it could be your starter getting weak...Original Alternator at 160K is pretty good. I've gone through 2 or 3 in my other vehicles by then but usually have to replace a starter here and there. BTW...PIA job on these cars but a doable DIY.
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Old 11-27-2013, 04:32 AM
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CALWATERBOY CALWATERBOY is offline
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Mein Auto: 2009 E93 N54
Quote:
Originally Posted by Leekay07 View Post


I had them check the battery last week they said its fine they registered the Battery again @ $55 and still my battery is drained to the point its dead.

I replaced the pulleys as preventative measure 18 months ago.



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