This US-made trailer wiring kit powers the lights on a trailer while protecting your bike's wiring system and, on newer bikes, the engine control module. This trailer wiring kit fits Harley touring bikes from 2014 to present including the Electra Glide, Road Glide, Road King, Street Glide and Tri-Glide. If you have a 2014-15 CVO with a pair of AMBER turn signals on the rear fender, you want our CVO kit.

Choose either the 4-wire or 5-wire kit, depending on how your trailer lights are configured. If you aren't sure which you need, check out this video that explains the differences between the two systems.


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review on the wiring harness

Marcel VanLoo on Oct 12th 2022

I recieved the wiring harness i thank you for that and thank you for being so helpful and i got it in a timely manner if i ever need anything i will be in touch thanks again

Wiring Harness review

Larry Kersich on Aug 2nd 2022

A little intimidating when you first open the package, but the directions are Clear and concise. Read them two or three times before you do anything. Very simple plug and play connections. My only comment is I wish I had not plugged in the connector between the isolator and sub harness before locating the wiring. I could not uncouple this, but it worked out ok. I would check the wires from the isolator to the trailer before hooking them up to be sure. But a great system, very easy to install.

Install on 2018 Ultra Limited

Tracy Knueven on Jul 10th 2022

This harness works flawlessly and the install was so easy! I was a little little leery of doing it myself since I’m not the best mechanic….especially with electrical items, but it really is a plug and play installation. I even have saddle bag lights and a flasher module for the brake lights installed and it still was a snap and the best part is it all works as it should. I watched the YouTube videos a couple times and followed the instructions, even texted Dale and he made sure I got the right parts. Don’t be intimidated…you can do it too!

5 wire harness for 20018 Road Glide Ultra

Dennis Revis on Mar 15th 2022

Everything worked great, my only complaint would be that the wires going to the trailer are color coded different than almost any trailer I have ever worked on, but the directions were well done so that was just a minor issue. I did keep a copy of your wiring code in the bike just in case I ever had to reference you color codes.


Richard j Coakley on Jun 2nd 2021

Product is awesome and easy to install.

Wire harnes

Steve turner on May 28th 2021

Good product but ran into 1 snafoo with the instructions. Otherwise was good.

FLHTCUTG Trailer Harness Review

Andrew on Mar 26th 2021

Harness looked great, shipped quick, and installed perfect. Worked like a champ and was very easy. Was a nice way to easily setup for a 5 wire trailer. I am sure that the 4 wire version would be just as easy and user friendly. Thanks.

Works like magic

Jeff H on Mar 25th 2021

The harness is a blessing and works awesome. I did have one issue but it was my issue with my aging eyes and little numbers on the wire labels. Once I got a bright light and cheaters I realized I had switched a couple of wires around. Once I got that ironed out, all worked beautifully. The customer service is great and fast shipping. Highly recommend for plug and play harness. Takes about an hour from start to finish and wrapping everything up neatly.