"Trailer Fault - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 02-20-2014, 05:46 PM Thread Starter
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"Trailer Fault

Sorry I have not been able to find exactly what I was looking for but here is my problem. The truck I drive for work is an 06 F550 with a flatbed on it. Recently it has been giving the Trailer Fault warning, but I have no trailer hooked up. It has a 6 pole round connector and a 7 pin wire connector. I have blown both out and checked connections. It also only does it when you press the brakes and when the left turn signal is on, but not the right turn signal. This makes me think it is something in either the wire or the fuse for the left turn signal and brake light. Does anyone else have an idea, its pretty annoying to drive through town.

Thanks
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post #2 of 8 Old 02-20-2014, 10:31 PM
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Try spraying the trailer connector out with some brake cleaner n it'll chase any moisture out, and wipe out any old electrical grease with a q tip. Mine was doing the same thing. Itdd say "tbc" fault when I applied the brakes. Doing this fixed it.

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post #3 of 8 Old 02-21-2014, 06:25 AM
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Clean the square inboard connector real good too. Its about 2 feet of wires from the bumper connector.


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post #4 of 8 Old 02-21-2014, 06:34 AM
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That double plug harness is a short pig tail that connects to another plug in the main harness, you may want to clean it as well. Also look at the harness it self for chafe spots not just to ground but wire to wire as well.


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post #5 of 8 Old 02-21-2014, 06:57 AM
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It could be you break sensor, it is located on your break pedal. I was getting the tbc fault until I changed the sensor, the beeping drove me nuts. I think the sensor is 27 bucks from ford.
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post #6 of 8 Old 02-21-2014, 07:14 AM
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Quote:
Originally Posted by FORDDIESEL276 View Post
. It has a 6 pole round connector and a 7 pin wire connector.
thats not factory unless you meant 5 pin flat and a round 7 pin blade

but agreed most issues are at the connections


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Last edited by ZMANN; 02-21-2014 at 07:20 AM. Reason: 4to 5
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post #7 of 8 Old 02-21-2014, 05:18 PM Thread Starter
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Thanks for the help I will try the suggestions. The truck has a flatbed on it that a local company put on so the 6 pole round connector is not factory. Does anybody know of a fuse that would at least stop the beeping. We mainly use the truck to haul not tow, but the beeping will drive you crazy.

Thanks for the help
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post #8 of 8 Old 02-21-2014, 08:53 PM
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Try pulling the trailer relays if they run on a secondary brake/ turn signal relay.
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