No brakes on trailer

crazyro wrote:

Gdetrailer wrote:
If you follow the 7 pin cable back to the trailer, it will eventually terminate in a box near the trailer box on the tongue.

All grounds are supposed to terminate at that point and one ground wire from that box will run to the frame of the trailer.

I opened up that box last night looking for any stray wires or anything that didn't look right. There are no wires going out from that box to the frame. I wonder if that could be something I should add?

Which is usually the white wire , there would have to be a white wire going into the box ,as well as going out the other end for the plug. Its hard to say where exactly that white wire is connected to the frame. I have wired utility trailer trailers , with ,and without brakes . The flat four plug, the wiring harness has the white wire the same length as the rest , I just run all four back , connect them ,and ground back at the rear somewhere ,I do the same if I have brakes ,that ground wire just gets run to the rear where all the lights are getting wired.

Although I don't use a junction box on the flat four wiring ,its just ran back all the way, you buy the 4 wire harness in whatever length you need ,when I wired the one trailer with brakes , if I remember back then I just ran all the wires I needed in a wire loom , and branched off where they were needed . If I were to do it today it would be the junction box ,and a molded plug that plugs into the truck.