Troubleshooting Trailer Wiring Harness That Instantly Blows Fuse When Connecting to Battery

Updated 08/18/2020 | Published 08/13/2020

Products Featured in This Question

Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

(2)

$78.76

12 Gauge Wire - Black Primary - Per Foot

(30)

$2.01

Wire Loom 1/4" Diameter, 10' Long

(293)

$9.21

Question:

I followed the video step by step and everything was fine until I got to battery. It shocked me when I placed it on battery which blew the fuse. Everything I try to add a new fuse it sparks and I jump. Im not sure what I missed?? Please help

asked by: Angel B

Expert Reply:

The Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM11140395 having a spark as well as blowing a fuse is a sure sign that the ground is not connected properly or the power wire at some point is touching a metal ground. I recommend tracing that power wire to ensure there is no insulation missing where it could be touching metal. You can see with our installation of this wire we used wire loom # 7509-10 in some areas to assist with areas that have sharp edges. If you need to replace any wires, I recommend using # 12-1-1.

expert reply by: Jason S