problem with electric trailer brake

Redrum, thank you for such a complete explanation. you are right the delaer doesn't have any idea about this. I am glad that you took the time to work through it. This info will save me a lot of time. You mentioned that you had schematics and pictures. That would be great if you could e-mail them to me.jeffmess@gte.net Are the blue and red wire that are under the fuse box difficult to locate once the fuse box has ben removed?

Thank you