Mini Cooper S 2003: Battery drain
I have a curious battery drain problem and am unable to locate the fault. I have a low mileage Mini Cooper S (2003).
The original BMW battery died (went flat) and didn't want to hold charge, so I bought another. The new battery subsequently failed so I exchanged it for another and that fails. I have therefore concluded that the battery probably isn't at fault.
I've used some of the super information on this forum to locate the fuse boxes in the passenger foot well and engine bay to carry out a drain test. I measured the amps flowing from the battery whilst pulling out each fuse. The following was noted:
1. With the interior lights on, 1.6A is measured.
2. When the interior lights dim to off, the current reduces to 0.6A. Removing the lighting fuse at this point does not reduce the current any further.
3. After a while, there's a drop to 0.2A.
4. Any activity that caused the car to 'think', opening a door, caused an increase to 0.6A for a minute, before dropping back to 0.2A.
5. The voltage across the battery is 12V, and 15v whilst charging (engine running).
6. No fuse was located in the foot well or under bonnet box that caused the 0.2A to disappear.
I suspect there is a third fuse box which is apparently in the boot, but I can't find it.
Is there anyone with some information on what may be causing the 0.2A constant drain and why I couldn't find the fuse on that circuit?
Last edited by jmb; Dec 19th, 2011 at 10:36 PM.
Reason: Correction to voltage.