Question about 2006 BMW M5

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Battery is being drain new battery replaced still losing power

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The alternator doesn't seem to be replacing charge when driving. Take the car to Autozone or similar business and have them check the alternator and the voltage to the battery (should read 13.5 volts at idle). If everything checks ok, then you need to track down whatever is pulling charge while the car if turned off. Remove the negative battery cable and rig a test light between the battery post and the cable. If you have light when everything is supposed to be off, then remove and replace each fuse until the light goes out. That will be the circuit that you need to trace for electrical leakage--look for unexpected loads like a light in the trunk, under hood, or glove box that is not being turned off. Hope this helps!

Posted on Oct 05, 2010

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SOURCE: power drain on 2001 xg300

put a noid light to the negative side of battery with it disconnected and you can one by one check to see when the light goes out to check for the drain the light will go out when you have found it connect the clamp of noid light to the battery negative post and the pointed part of it to the cable end try it works well for finding what is draining your battery

Posted on Dec 06, 2009

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SOURCE: New battery keeps losing power...

Hi!
There seems that the current is leaking frm somewhere.
Firstly put off all equipment and ignation.
Keep a multimeter in hand.
Remove all the fuses frm the fuse box.
Now..
one by one touch the pin of the multimeter(RED) to one end of fuse solket and the other (Black) pin to the other soket where the fuse sits.
There should be NO reading... keep going from one fuse point to another.... the point wher the multimeter reads while all switches OFF means from tat equiptment the current is leaking... Now check That fuse is for which equiptment e.g. for AC or for blinkers or for headlights etc etc.
Get thet unit checked / repaired / changed as the case may be.

Regards
Berry

Posted on Jul 13, 2010

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