Just got an electrical problem and wondered if anybody had hints about
where to look.

It's a 1984 318i.  The radio (a recent one from the previous owner),
clock, glove compartment light (there is one, right?) and dome light
on the driver's door are out.
So I checked the fuse and it was blown.  Tried a new one and it blew
immediately as it went in.  So I'm not sure about where to start on
this.

Some other info that should be unrelated.  I had taken off the fuse
cover a few days earlier and the catch on the cover snapped, so I had
driven briefly without the cover, but it all looks clean and dry.
Next, the trunk had been left up overnight just before this situation
happened.
Speedometer has been intermittent for some time.