I have a '92 940 that runs great but after sitting for a few days the battery discharges. I have tested the alternator and the battery and both check out fine as far as charging goes. The battery reads about 14.5 volts when running. I also put on a DC clamp meter to the positive leads on the battery and find it drawing about 2 amps on the alternator line when the car is off and about 12 amps when the car is running. I have tried pulling each fuse to see if the load in the battery drops when a fuse is removed but there is no loss of drawn amperage with the removal of each fuse.


Can the alternator discharge the battery when the car is not running? Is this an indication of a bad diode in the alternator? How can I test to see if this is the problem?
Thanks.

 

Just disconnect it and see what happens after a few days...