Installation of Trailer Wiring Harness Through Frame or Conduit on 6x12 Trailer

Expert Reply:

It sounds like your current wiring is run through either conduit or the frame of the trailer. If this is the case, then I recommend utilizing the current wiring as a pull wire to bring the new wiring into place. You can simply use electrical tape like # DW04367 to connect the new wires to the old wires with a tight wrap to give you the connection to pull the old wire from tail light end allowing the new wire to pull from the coupler end through the metal tube into position.

I recommend using the 20 ft. Wishbone 4-Way Trailer Wiring Harness with 30" Ground Wire # A20WB to give you the separate running light wire on each side of the trailer.