The_Real_Santa

Yes we actually took it to Ford and they said the 7 pin had a loose wire they fixed it and still didn't fix the problem.

Yes it is a Ford F-250. The problem is it does not do it all the time. I can hookup and town 2 hours before it will do it. Other times I get 1/2 a mile down the road and it starts doing it. 

I saw a post from back in 2016 about this same issue. I have an issue that is the same and can not figure it out. 2018 F250 with OEM brake controller. 2018 jayco travel trailer. This is an intermittent issue. I can be driving 10 min or sometimes 2 hours and then I will get the message Trailer wire fault as I start to press the brake pedal. The trailer brakes go out. I press deeping into the pedal and they sometimes come back on and very hard. Sometimes they don't come back on. I have had the 7 pin checked, I have replaced the pig tail from the trailer, I have cleaned up the wiring in the box on the front of the trailer. I have had new brakes and pads and hub replaced 4 times. I have pulled the break away and re seated it. Still never know what the brakes are going to do until I start towing. Sometimes it never happens, then the next time I go out 30 min down the road all the sudden without even pressing the brakes I will get the error message. It seems to happen a lot when coming off the highway on an exit ramp and you have to slow down faster than normal, or get deeper into the brake. RV dealer said trailer is fine, Ford dealer said truck is fine. HELP