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Old 12-18-2019, 03:53 PM   #1
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Wiring Fault???

When pulling my 2017 VIBE with my F-150 I recently started getting intermittent
Wiring Fault notifications on my dash. I say intermittent because it would show for a couple of seconds and then disappear. Have not had this issue in the past. I think I might have caused the problem with new tires inflated more than they needed for the weight of the trailer. It caused a lot of bouncing. (I have lowered them from 85 psi to 50.) I'm guessing a connection may have jiggled somewhat loose but not totally disconnected. I am assuming that wiring fault means break lights, running lights, turn signals, etc. Since this has only happened a few times and I've been driving when it happened I have no idea of where to start looking.

Any suggestions on how to troubleshoot this intermittent problem?
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Old 12-18-2019, 04:05 PM   #2
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There have been a few reports here on folks having some intermittent connection issues and not only with Fords. I recall one being an issue where the factory 7 pin receptacle plugs into the main wiring harness underneath, up by the spare tire somewhere and another was simply a corroded 7 pin connection.

My biggest concern though is your statement of lowering the air pressures from 85 PSI to 50 PSI.

That is a HUGE difference. How have you calculated the proper air pressure to run?
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Old 12-18-2019, 04:31 PM   #3
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Tire Pressure

I did not realize you could very the tire pressure. I just inflated to the max 85 psi. Doing some research after the trip I found the attachment that gave the tire pressures for the different trailer weights.

I know that it was my fault. The inside of the trailer showed the effects of the very increased bounce too. But nothing I couldn't fix.

Thanks you for your feedback. I hope that I have properly added the attachment.
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Old 12-18-2019, 05:25 PM   #4
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Some model F-150's have a corrosion issue in the wiring harness over the rear end. You might want to check to see if yours is one of those.
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Old 12-18-2019, 05:36 PM   #5
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my F150 showed that and it was a loose 7 pin connector.
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Old 12-18-2019, 06:11 PM   #6
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I've had it occur a couple times, it's usually dirt and/or corrosion on the 7 pin connector - truck or trailer side. Try and clean it a little and put some dielectric on them to start
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