To help find a short circuit or something that's blowing a fuse, I made a test device to show me when there's an excessive load on the circuit, without blowing fuses. I used an old headlight and one of my blown fuses. Solder wires to the two terminals of the fuse, and the other ends of the wires to the good filament of the headlight.
Plug this into the offending fuse holder. When there's a normal load, the headlight will only glow. When there's an excessive load, the headlight will be bright, but nothing will be harmed by the overload!
I've even used this trick on my a/c compressor circuit. The compressor worked fine and the headlight glowed, until I found the intermittent short. Then the headlight shined brightly!