Your OEM wiring is a daisy-chained parallel configuration. The wires are fed to one brake location and then proceed to each following location. The best remediation is to rewire the brakes in a Star configuration, a pair of wires or at least one power wire to each brake location. You can terminate the star wiring at a terminal strip in the front of the trailer and lead your umbilical wire to this terminal strip. If you install a pair of wires to each brake, and install the terminal strip, diagnosing an electrical brake problem becomes very easy. It can all be done from that forward terminal strip.
