Looking for Replacement Trailer Wiring Harness for Heavy Duty Equipment Trailer

Updated 08/04/2026 | Published 07/30/2026

Products Featured in This Question

etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector

(446)

$62.99

14 Gauge, 7 Conductor Jacketed Wire - Per Foot

(145)

$5.54

Question:

Hello, I’m looking to rewire my 16’ heavy duty equipment trailer do you see a harness?

asked by: Thomas C

Expert Reply:

Hey Thomas, so we don't have exactly what you are looking for but we can help. If most of the trailer wiring is in good shape you can use the etrailer junction box part # e99011 to add the 7-way to the trailer. Basically you match all of the wiring of your trailer to the correct posts of the junction box, mount the box on the trailer, and then run the 7-way to your tow vehicle.

Otherwise you could use the junction box as the starting point and then run the wires for each circuit from there as a way to make it nice and clean.

We also sell 7-way jacketed wire with the part # DK74FR which would make the rest of the wiring easy. It's sold by the foot so the quantity you'd need to order is the number of feet you'd need.

expert reply by: Jameson C