WHAT WOULD CAUSE THE TRUCKS EGNITION FUSES TO ...

  • Tiny
  • Anonymous
  • 1994 Dodge Ram
  • 100,000 miles

What would cause the trucks egnition fuses to keep blowing

Monday, March 18th, 2013 AT 11:28 PM

1 Reply

  • Tiny
  • caradiodoc
  • Expert
  • 25,635 posts

Too much current. Depending on which fuse it is, you might check for an oxygen sensor wiring harness that fell onto hot exhaust parts.

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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Tuesday, March 19th, 2013 AT 12:16 AM

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