Trailer Connection Issue

[Bob Rosadini]

I'm posting this on this thread as it might apply to more Fords with towing packages. Couple of weeks ago I was hooking up my '23 F-150 to my skid steer trailer.  Never had a problem with it before but was getting a "trailer not connected" message and a "Trailer brake module fault message".  No lights, no brakes.  I was  pulling my JD 4720 cab tractor with bucket on it and a set of HD forks.  Tractor has loaded R-4 tires and a concrete weight block that is between 400 and 500 pounds.  Did not want to chance pulling if at least brakes worked it as I  have a steep downward grade on my route and did not want trailer steering the truck.

 

 Since then same trailer has been pulled by a Ram and an f-350 and lights and brakes work fine.  Last week take truck to dealer-and by the way, tested my 7 pin connector and it is fine. Dealer has been screwing around and says..we need the trailer to test it.  I say,  "no way-look at fault code"!  So to prove my point beyond two other trucks towing same trailer with no issues I tested trailer one more time with my son's '24 150 and everything works fine.

 

Any opinions.?  Must be some tech assistance dealer can access i hope.

By the way truck has a 7050 GVWR, 3.73 locking rear, "Trailer Tow Package Integrated Trailer Brake Cont." 

[Captainp4]

We used to have issues with corrosion on the older super dutys that were plow trucks (pre 2011 or so), sometimes just needed to clean the pins to get a solid contract. Fuses and relays in the trailer circuit was always a problem too, had stacks in the glove boxes. Not sure if that helps you any (or if the newer trucks would just tell you on the dash if something was burnt out), but worth checking out if not. Could also be on the trailer side, almost bad ground or something that the other trucks aren't picking up, but doubt that if you tried 3 other trucks.