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Old 05-05-2015, 08:03 PM   #1
Nor'easters Club
Ford Super Duty Owner
Join Date: Feb 2014
Posts: 39
Short circuit... Help!

I have an '89 Cobra Newport (john deere chassis - ford motortrain) and my 15a horn fuse keeps blowing.

I traced the wires and the cig lighter, map lights (on a dash switch) backup power for the radio, and the horn are the only things on the circuit. I traced the wires back from each device to the fuse box to a red wire plugging into a separate slot on the box than the fuse. I have a power probe and it reads ground and when I put power to it it pops the breaker on the probe. I cut the wire just before the fuse box and when I put power to the wire to the items, they all work fine but when I put power to the end to the box it pops the breaker. How can I find the short?? It seems to be in or before the fuse box but I don't understand how that could be. There are other slots on the fuse box that also pop the breaker when I put power to them but it's inconsistent. I've spent 8+hrs now tracing wires and I'm at a loss for what to do next. Please help.

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Old 05-05-2015, 10:55 PM   #2
Senior Member
Join Date: Mar 2015
Posts: 143
Sounds like a ground fault in the box to me. Check the connections in the box to ground. Going to be time consuming. You'll have to pull all the fuses, and check all the connections. Good luck.
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