11-16-2012, 08:37 PM
Humble E34 lover
Location: Asheboro, NC
Join Date: Dec 2008
Mein Auto: 1992 525i
I have saved this for my personal use should I need it in the future. Very nice succinct and to the point directions
Originally Posted by paperplane94
The way to check for battery drain is as follows, get an ammeter, or a DMM that has an ammeter setting.
Remove the backseat bottom and roll down your rear windows so you can access the fusebox without opening the door.
Remove the negative cable.
connect the ammeter between the neg. cable and the negative battery post.
Wait a few seconds for all the electronics and check control to shut down.
There should be a small battery drain that is used for the clock, about less than .03 amps
Anything more than that value....begin by pulling fuses in the front, then rear fusebox while watching the ammeter for a drop in current drawn.
If the current comes down to less than .03 amps you have found the circuit draining the car!
ID and fix circuit accordingly.
Calypso Red 1992 525i with 170K miles
1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold