Volvo Repair: Door Ajar, aftermarket radio, dome light

Question
Robert, I have a 1992 Volvo Gl and the door ajar warning keeps going off even
as the car is running.  Every time I try to replace the fuse (15) it pops.  One day
it just started to happen.  The radio, dome light, and antenna are all connected
to the same fuse.  There has been anything new added or replaced.   It just
started to happen.  Is there a switch I don't know about?

Answer
You have a short in the system.You will have to isolate the systems to locate the short.Should be relatively easy. Try turning off the dome light as a possible quick solution.But oft times there has been a aftermarket radio installed and the wiring installation is to blame.