$129.95 $119.00

This trailer wiring kit fits Harley touring bikes from 1997 to 2013 including the Electra Glide, Road Glide, Road King, Street Glide and Tri Glide. It also fits the Softail from 1997 to 2017.

A relay-isolation harness is a good investment if you're planning to pull a trailer. This setup allows you to drive a set of trailer lights (standard bulbs or LEDs) without affecting or loading the bike's signal circuits. In the event that a short develops in the trailer wiring (typically in the plug area), an inline fuse in the relay package protects both the bike and trailer. Your bike's lights will remain unaffected and continue to work. 

Trailer lights can be wired in one of two ways:

4-wire: Brake and turn signals are combined. Usually the plug on the trailer is a "flat four."

5-wire: In this setup, the trailer has a separate set of lights that act as the brake lights. Turn signals appear on a separate pair of lights.

Choose the kit that matches the way your trailer lights are set up. If you're not sure, get the 4-wire kit. It can be used for both 4 and 5 wire applications.

Current Stock:
$129.95 $119.00


Reviews Hide Reviews

Better than expected - Happy Customer!

John Gregory on Apr 14th 2020

The wiring harness showed up 2 days earlier than expected, well packaged and protected. Installation was a breeze because the instructions are well written. As the instructions explain, don't depend on wire color. Confirm function of the trailer's tail/running, brake, and turn signals wiring first before completing any connections. Go slow and everything will be ok. Even the length of the harness was perfect requiring no trimming to get the length right. Well done Dale! PS - I'm glad he kept the price lower by not including "standard" connectors because my old trailer is a 5 wire but with a rare square 6 connector.

Harley Wiring Harness + 4 flat converter

Sam Piper on Mar 25th 2019

I received the wiring harness and converter very promptly.. There are instructions with each component. The most important instruction is to "read the instructions." Following the instructions resulted in a 100% successful install on the first try. The only surprise is that a 4-flat (vehicle side) connector is not included in the converter. The connector is easily available at most auto parts stores. I've used the trailer a few times now and everything is perfect. Thanks Dale for all you support as I got through my trailer purchase and wiring processes.