A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well in most circuits, but this one needs to pass higher current, so you might want to use a head light bulb. A brake light will limit current to one amp. A head light bulb will pass up to five to six amps. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.
Monday, December 28th, 2015 AT 7:55 PM