Have problem with brake indicator or F350 when towing a 5th wheel trailer. It is intermittent problem. Shows no brakes and then will turn green - showing brakes on trailer. Have checked all wiring and Ford dealer has checked indicator on truck end. Anybody else have this problem? What did you find?

 

I have a F250 the trailer warning lite comes on goes off then may stay on and i have no brakes at all i took it to a ford dealer several times they said it was the camper the camper store checked the trailer several times towed it with a different truck not intregated trailer brake but a f250 truck and had no problems ford said tough luck. hope you get yours fixed iam going to put a after market on mine

 

I replied to your problem once, after a complete recheck of my camper,I found out there was a short in my brake wiring inside the wheel of the camper. The truck picked it up, but to find the problem,the wheels had to be jacked up and the test box hooked up. The wheels spun by hand and the test box turned on it showed which wheel had the short. The bad part was the truck after a few beep alert's would disable the brake controller and you have no trailer brakes I did not try the slide switch manually to see if it worked it my have. Hope this helped