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X5 E53 (1999 - 2006)
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Old 08-10-2011, 01:09 PM
Jersey C.I X5 Jersey C.I X5 is offline
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Location: Jersey CI
Join Date: Aug 2011
Posts: 2
Mein Auto: United Kingdom
battery drain and Hi from new member from Jersey Channel Islands!

Hello, I wonder if anyone can help with this?......2004 X5 4.4i model, Love the car and have a few BM's over the years, I have a problem with the battery draining over the course of 7-10 when being used?, my mechanic has replaced the battery and checked the alternator and says its fine, I'm guessing there is a 'drain' on the battery from somewhere and its not charging up when driving, it started with the radio going off for a few seconds and culminates in the car going into 'trans safe mode' and limping home with a flat battery? HELP! thanks.
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Old 08-10-2011, 01:19 PM
BimmerNutX5 BimmerNutX5 is offline
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Location: Michigan
Join Date: Aug 2011
Posts: 33
Mein Auto: 2002 X5, 1995 525i
Sounds like your mechanic has misdiagnosed the alternator. If your driving and it is not charging then for some reason the alternator is not charging the battery.

1981 320i (sold)
1986 635csi (sold)
1995 525i (Daughter's car)
2002 X5 3.0i (Wifes Car)
2006 Jeep Grand Cherokee Limited, 5.7L Hemi, Quadradrive II, KYB Suspension, Magnaflow exhaust, Cold Air Intake. This is my current vehicle.
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Old 08-12-2011, 12:53 PM
Milesoffshore Milesoffshore is offline
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Location: MAryland
Join Date: Jun 2011
Posts: 26
Mein Auto: BMW X5
Put a volt meter on your battery while it is running. A working alternator should give you a voltage reading anywhere between 13 and 14.5. I think if it is over 15, there is something wrong w battery. No mechanic here, just passing info told to me.....
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