Battery discharge help
 

I am experiencing a battery drain on 1991 190E 2.6. Ive searched the forums and unfornately not too many had solutions.

I measured the draw at the battery by disconnecting the postive lead and connected my multimeter and found out the draw. It was .26 amps.
What should the value should be?

I then started pulling fuses until I isolated the fuse that was draining the battery. It happens to be fuse #12.

How do I go about diagnosing the problem when I have isolated it?

forgot to add BRAND NEW battery and the alternator is charging the battery.

what components are on fuse #12?

Anti theft system, central locking system, courtesy lamps, rear reading lamps, power seats

Why don't you ...
 

check all of the functions associated with that fuse for normal operation with ignition on and then off and report back.

ok so after looking at the wiring diargams I disconnected 1 by 1 all the power consumers on fuse 12.

antitheft control module
central locking supply pump+ground
antitheft door switches
power seats
power seat motors
trunk lamp+coutsey lamp
checked configuration of radio
diode at x42

I had someone crawl in the trunk and i closed it and the light went out as soon I closed it. The aftermarket radio is hooked up right. I cleaned up corrison on some connectors. Still didnt drop the 200ma draw on the battery with the key off.

I was going to check the ground connections next. Any other ideas?

I am guessing if you disconnect the radio the draw will go away.

already tried that still doesnt change the amp draw

checked all the grounds at w1 and nothing out of the ordinary. I found a really warm relay which happens to control the power seats.