Hi everyone, just a quick update,
Everything in the trailer now works. I towed it out to my mechanic who had an electrician fix it. They did it in an hour or two. Rewired the 7-way and, in the rear of the trailer there were wires that were unplugged or broken. I think the mice had chewed through them. But now I have working lights, turn signals and electric brakes. Now all I have left to do before our first trip out is to get new tires, repack the bearings and fix two broken copper lines.
I appreciate all the help that everyone provided!