Check for something electric that may be staying on. Trunk light, perhaps?
Radar detector? Turn the car off and open all doors, hood and trunk and look
for a light(s) that shouldn't be on. Maybe an audio amplifier? Powered
subwoofer? I've done that one! :)
Had this problem before.
Disconnect the battery on one side and connect a voltmeter to bridge the gap
from the battery to the cable.
Start pulling fuses to see when the voltage drop stops. (be logical about
It's safe to have the fuse diagram handy to get the right amp fuses where
Mine was a radio that was in "stand-by mode" instead of "off". I just popped
the faceplate loose each time I left the car and it was fine.
Bill in Omaha
Some devices are always 'live' on a modern car, so this test wouldn't be
conclusive. Use an ammeter and look for a total in excess of about 50mA
which is the normal 'resting' current. Anything which takes out a good
battery overnight will be drawing several amps and this isn't normal.
*Ambition is a poor excuse for not having enough sense to be lazy *
Dave Plowman firstname.lastname@example.org London SW
I thought these models were designed so that the car goes to "sleep"
after a certain period of being shut off? I had on occasion left a
light on in my e46 and never found the battery to be dead. I would
think that you still have the original battery and it is time for a new
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