Kyle Mastropasqua Posted Monday at 03:11 PM Share Posted Monday at 03:11 PM I have had issues with trailer lights since I purchased the truck new. This summer I decided to really dig in. I replaced the exterior trailer receptacle, the trailer light / brake wiring to the receptacle, and the trailer lamp control module. Fuses are not blown. After replacing all parts truck was giving me a trailer brake connected fault randomly, and check trailer lights fault consistently. Now it gives me service trailer brake system on start up. Dealership is indicating that faults for all lights and trailer brake are showing. They only thing that has not been replaced with OEM parts, is the harness itself. What am I looking at the finally remedy this problem? Its just aggravating at this point, and borderline undrivable with a trailer due to the constant messages that are popping up while driving. Quote Link to comment Share on other sites More sharing options...
gmatx Posted Monday at 09:53 PM Share Posted Monday at 09:53 PM What have you checked on your trailer? I had some faults pop up when I had some water intrude into one of the LED brake lights on my travel trailer. It would happen off and on as the water sloshed around inside the housing. It went away once I replaced the brake light. Also have you tried using a 7 pin trailer brake tester? 1 Quote Link to comment Share on other sites More sharing options...
64BAwagon Posted Monday at 10:27 PM Share Posted Monday at 10:27 PM A lot depends on the circumstances when the faults occur. If its only when the trailer is connected you need to diagnose the trailer. The first thing I would do is replace the plug on the trailer side with a Pollack brand since thats who makes the ones on the trucks. Some info on the trailer would also help direct the diagnosis. Like @gmatx says. Find a 7 way tester (not expensive) and double check the truck. These trucks are sensitive to the janky wiring on some of the trailers. It might also be helpful to check your truck with a different trailer and your trailer with another truck. Quote Link to comment Share on other sites More sharing options...
Kyle Mastropasqua Posted Tuesday at 01:08 AM Author Share Posted Tuesday at 01:08 AM Everything has been tested, trailer works as it should, no faults no ground issues. Doesn't matter whether a trailer is connected or not now, service trailer brake system is a fault at start up. This isn't something simple those things have all been trouble shot or replaced. Quote Link to comment Share on other sites More sharing options...
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