Hi,

I am having the exact same problem with the exact same fuse. My vehicle is an 87 560 SEL. I am right in the middle of figuring it out and assume I dont have near the Benz mechanical experience you do.

I will give you some of my info in the hope it helps.

I believe this all started when I charged my battery with a charger, had car positive cable hooked to the battery and used too much voltage to jump start it (200 amp quick start). I seem to have blown out a number of electronic boards in a number of parts.

With # 15 fuse pulled battery does not drain.

I noted that although my central lock pump worked, it seemed to stay on slightly. I did not hear it at first and can only assume it did so intermittantly or was tool low for me to hear. When I put it in a quieter area I noticed it. I took it out and it smelled wrong (burned) so I disconnected it.

It seems that this has slowered or stopped the drain but I am not sure yet because I want to let the car sit for a few days to see if this has fixed my problem. The drain was so slight that it would take 3-5 days before depleting battery enough not to start.

I guess a good idea might be to disconnect all known connected items, even though they seem to be working fine, and wait a X days. If battery does not drain, obviously wiring and anything else connected is all ok. Then reconnect individual items one at a time and wait a few days between each. Continue until you find the culprit. This may seem long and a hassle but I have been dealing with this problem for awhile - so if you know or find a better way PLEASE post it so I can get this headache over with.

Best Regards,

Lance