So it has been several days and I need to update this. I replaced my breakaway, ran new wire from breakaway thru bottom trailer, through each axle, and to each wheel. Soldered joints and tested in driveway. Pulled breakaway all 4 wheels slid.
Hooked up next morning for a 1200 mile trip and first bump got the "check trailer brakes" warning. I continued on and next bump I had brakes again. I drove the 1200 miles w/brakes 99% of time, sometimes for several hours. Only thing left is pull the wheels off, what besides the obvious like bare or broken wire should I look for?