Mercedes Benz repair: 1987 MB 420 SEL fuse #15 keeps burn out, power antenna, upper terminal


Question
The #15 fuse burned out. I unplugged the power antenna unit, the central locking vaccume unit, the seat control units (three plugs under each front seat) and there is still about 0.6 ohm (I measured with a multi-meter) between the #15 fuse upper terminal and the body ground terminal.

What else is short-circuiting the #15 fuse?

The car is running fine without the #15 fuse, except that:

- the central locking system is not working.
- the interie front overhead light is on unless I turn it off with the overhead switch.
- the overhead seatbelt warning lights keeps blinking when the engine is running.  

Answer
You have a short circuit on the positive feed line.
Best guess:
The short may be in the wires that bridge from door to body, or the dome light switches at each door.

Here is a link to basic testing, and diagnosis.
http://www.tpub.com/content/construction/14273/