Under the hood fuse no. 15 keeps blowing

ABODI

MEMBER
1990 MERCEDES BENZ 300SE
180,000 MILES

As soon as we put the fuse in it blows. Do you have a wiring schematic that shows where the ground is or how do I find the short. I cant find a wiring schematic on line. Can you please help asap. I dont know what else to say here. It says my details are too short. But why drag it out. Make it short and to the point right?

Friday, October 4th, 2013 AT 12:07 AM

1 Reply

CARADIODOC

MECHANIC
34,178 POSTS

You could have added which circuit(s) are dead. I can't get into the service manuals but there are many circuits that have common places to look for shorts and corroded connections.

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.

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Friday, October 4th, 2013 AT 1:13 AM