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Old 01-30-2013, 07:51 PM   #1
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"Wiring fault on trailer"

Anyone run across this? I have a 2010 F-150 with an integrated brake control. A "Wiring fault on trailer" alert popped up on my dash, with an annoying chime. I haven't had a trailer on in a while, this just came up out of the blue. 4 pin and 7 pin connectors look good, I always use dielectric grease. I has been rainy here lately. Anyone have any thought?
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Old 01-30-2013, 07:54 PM   #2
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Bad ground on trailer is a good possibility !
Ground for the trailer brakes that is.


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Old 01-30-2013, 07:57 PM   #3
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I don't have a trailer hooked up. Bob tailing, this just came out of nowhere.
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Old 01-30-2013, 08:01 PM   #4
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Sounds like water got into the rear of your pigtail socket.

You could try WD-40 to flush it out or find the fuses for your trailer's socket and yank them till things dry out.
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Old 01-30-2013, 08:15 PM   #5
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I had the same problem on my 2008 F-250. It could be water like Herk said, but mine ended up being a bare spot on one of the wires in the pigtail that was intermittently grounding out against the truck. The dealer replaced the pigtail under warranty and I haven't had that problem since.
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Old 01-30-2013, 10:43 PM   #6
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sorry ! I just assumed when you had said you hadn't had a trailer hooked up in awhile that you had just hooked it up .

Try pulling your "trailer brake" fuse and see if the "wiring fault" goes away .
I would assume that the integrated controller has a separate fuse so don't pull that one.
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Old 01-31-2013, 08:40 PM   #7
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Looks like it may be water in the socket. It got cold here last night, everything froze solid. No fault codes today. I'll dig a little deeper when it warms ups a bit. Hopefully it's that easy.
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