If you don't have a batteries in the trailer and the trailer breaks away from the vehicle, just where do you think it's going to get power to turn on the brakes.
I know where the break away brakes get there power, I pull a lot of differant trailers and most are heavier than my camper but my camper is the only one with break aways on it, so I am not worried about the break aways for the couple of miles I tow it to store it. Thanks for the heads up though.
What code does your brake controller display? such as: 0.9 flashing 2 times a second or a steady display indicates a bad ground to your tow vehicle battery. Your tow vehicle produces the voltage and current to your electromagnets in you trailer brakes but your electromagnets in your trailer brakes closes that current path via ground or negative of your trailer back to your tow vehicle negative(ground).
My controler shows n.c. which means no conection. I dont think it is any thing on the truck because I pulled my dads skidsteer back to his place that night and it worked fine.
Hmm, I agree with you it sounds like your trailer must have an open in the wiring or the brakes themselves. You can trouble shoot that with a volt ohm meter check the easy stuff first
Put the battery on the trailer and see if it works, but if it does it still does not make sense, and I would still check the wiring job.
I know that it was a while but if finially had time to pull my camper home to work on it. It does need the battery to run the brakes. I hooked my camper up and my controler said no conection, unhooked the truck and put the battery back in the camper and pluged the truck back in and the brakes worked fine. Thanks every one I am happy it was not a real problem and can spend my time on other projects.