Last week, my trailer blew the fuse in my truck’s backup light circuit. After several diagnosis trips and blown fuses, I isolated the problem to the wiring bundle running the length of the trailer frame. There are several large washers welded along the frame that the wire bundle runs through and the bundle is zip tied to the last one near the rear fender. Much to my surprise, the wire insulation was rubbed through at this point causing the blue wire to short to the trailer frame.
This shows the abrasion at the zip tie location, but there was wear at nearly all the other washer locations.
I taped all the abrasion locations and created insulation sleeves from split wiring harness cover. I zip tied a sleeve in each washer providing an insulated tunnel for the wire bundle.
I continue to be puzzled as to how this wire could wear the insulation when it Is just lying inside the big washers. One of my friends suggested that it was the wind blowing the wire around as you travel and causing the most severe wear at the single point that was fastened.
This trailer is less than a year old and is one of the first ones produced by EZ-Loader, you may want to check your wiring bundle if you have one of these trailers.