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#1
07-24-2011, 06:05 AM
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4.6IS Battery Drain Problem
I have a 2002 4.6is with 60k miles. I have recently bought the car and in the service history there is evidence that there has had dead battery trouble in the past. All work was carried out by main BMW dealers. The battery was replaced with a Bosch standard one back in August 2010 and then the FSR/Hedgehog was replaced in December 2010. Since owning the car for the last 2 months the problem seems to be getting worse. The battery will go flat within in a few days sometimes 1-2 days which is quite annoying. I have been doing some reading on here about the FSR's being the problem and since this has been changed 7 months ago I thought maybe this should still be ok?? Do you think this would go again? Also the latest problems which has happened since the battery keeps going flat, is the ABS/DSC light coming on when the car is started and not going out someone on here kindly told me to turn the steering wheel boths ways which thankfully clears the lights! BUT the latest problem is the fuel guage light is on and displays its empty and doesnt move the needle and the computer range displays ---- miles Also to add to this the outside temperature displays -48c!!! which even for English weather is beyond a joke! Please help me guys I really don't want to fork out loads of money at the stealers for them to not even fix the problem! Thanks! James 
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#2
07-24-2011, 01:32 PM
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I had the same issue with my battery going flat, three batteries to be exact! Had the dealer diagnosed the car and it was the alternator going south. Replaced the alternator to the tune of $1725.61 including tax. Do you have the battery light on?
__________________
03 E53 X5 4.6is Sapphire Black on Black 08 e65 750i Alpine white, Sport Package
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#4
07-25-2011, 02:40 PM
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Thanks for the info! I do hope it isn't the alternator at that that price tag!!
No the battery light isn't on. I will get the multi metre out and see what voltage I am getting. Am I right in saying when the car is running I should be getting a reading of about 14v and when the engine isn't running around 12v? Cheers James
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#5
07-25-2011, 03:37 PM
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Quote:
__________________
03 E53 X5 4.6is Sapphire Black on Black 08 e65 750i Alpine white, Sport Package
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#6
07-25-2011, 05:13 PM
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Same problem here, just rectified two or three weeks ago. The retail price on the OEM alternator was $1100 my cost, i get jobber pricing. I found one aftermarket for less then half the price. Turns out it was a rebuilt factory unit, so don't hesitate to go aftermarket. I paid $477 CDN after the return of the core.
The job itself is 100% doable as a DIY job. I did it myself using only the printout of the DIY instructions from this site. If you have some patience, some tools and basic mechanical ability, you can absolutely do it on your own.
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