Why do I keep blowing the 30 amp fuse when I turn the key to the on position. On a 1992 e350 diesel?
Friday, October 26th, 2012 AT 6:41 PM
You have a short circuit. 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. 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.