bing tracking image
  1. Tow Bar Wiring
  2. Hopkins
  3. Wiring Harness
  4. Plugs into Vehicle Wiring
  5. Tail Light Mount
  6. Custom
Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Item # HM56009
Our Price: $95.34
You Save: 9%
Tow Bar Wiring

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Shipping Weight: 1.32 lbs
Add to cart
In Stock
HM56009 - Custom Hopkins Tow Bar Wiring
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Need help with installation?
Locate installers near me
Wire your vehicle and get the signal lights required for flat towing without having to splice into your wiring with this custom, plug-in harness. Integrated diodes prevent feedback from RV for safe operation. Wires as combined lighting system. Great Prices for the best tow bar wiring from Hopkins. Hopkins Custom Tail Light Wiring Kit for Towed Vehicles part number HM56009 can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (104)
  • Q & A (0)
  • Photos

Hopkins Tow Bar Wiring - HM56009

  • Wiring Harness
  • Plugs into Vehicle Wiring
  • Tail Light Mount
  • Custom
  • Hopkins

Wire your vehicle and get the signal lights required for flat towing without having to splice into your wiring with this custom, plug-in harness. Integrated diodes prevent feedback from RV for safe operation. Wires as combined lighting system.


  • Lets you wire your vehicle to accept your RV's tail, brake, and turn signal lights for flat towing
    • Wires towed car as combined system so that brake and turn signals travel along same wire
    • Provides 4-way flat plug at front of towed car to connect to motor home
  • Plugs in quickly and easily - no cutting or splicing of wires
    • Connection points are located near rear bumper
  • Prevents electrical feedback to safeguard towed car's electrical system
    • Weatherproof box keeps built-in diodes protected
  • Won't interfere with electrical system when towed car is not hooked up to RV
  • Custom designed for your vehicle
  • Includes wiring harness, mounting bracket, and installation hardware
    • Extension loop for connecting towed car to RV is sold separately
    • Brake light relay (RM-88400 - sold separately) may be required if used with supplemental braking system
  • 90-Day warranty

Wiring Your Towed Car with Hopkins

Wiring your car for flat towing has never been easier. No more testing wires or splicing into your electrical system. No need to painstakingly position multiple diodes beneath your vehicle. No worries about voiding your warranty. With this custom-fit towed vehicle wiring kit from Hopkins, all you have to do is plug the harness into your vehicle's existing wiring, which is located at the rear of the vehicle. No cutting, tapping, or splicing is required.

After plugging in the wiring harness, use the included bracket to mount the 4-way flat connector at the front of your towed car. An extension loop (sold separately) is required to connect your towed car to your RV.

Separate vs. Combined Lighting Systems

Some automobiles operate on a 3-wire system, wherein the brake signal and the turn signals travel along different wires to illuminate different lights. (Typically, these vehicles have amber turn signals.) This is referred to as a "separate lighting system." When you hook up for flat towing using this harness, your towed car's lighting system will operate in a combined fashion regardless of whether it typically has combined or separate lighting. This means that the brake and turn signals sent by your RV to your towed car will be carried on a single wire. As a result, your car's brake lights will do the flashing for the turn signals. Your vehicle will still function as designed when not hooked up to your RV.

Do You Need a Brake Light Relay?

Because this harness wires your vehicle as a combined system, a brake light relay (RM-88400 - sold separately) may be required if you use a supplemental braking system with your towing setup. A supplemental braking system depresses the brake pedal in your towed car every time you apply the brakes in your RV. So, if your towed car's brake lights illuminate when the brake pedal is pressed and the engine is off - as is the case when towing - then you need to install a relay to ensure that the lights on your towed car always act in accordance with the signals sent by your RV via the wiring harness. Without a relay, the brake signal from your towed car will override the turn signal sent by your RV when you slow down to make turns, creating a potential hazard.

56009 Hopkins Plug-In Simple Dinghy Towing Harness

Installation Details HM56009 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles - HM56009

Average Customer Rating:  4.8 out of 5 stars   (104 Customer Reviews)

Wire your vehicle and get the signal lights required for flat towing without having to splice into your wiring with this custom, plug-in harness. Integrated diodes prevent feedback from RV for safe operation. Wires as combined lighting system.


These are well made and stronger than I thought they would be. With the installation video I feel I can do the job easily.

2018 Ford F-150

This tail light wiring system worked perfectly as described in the instructions. I would definitely suggest the HM56009 for anyone with a 2018 F150. It makes life so much simpler than wiring in separate diodes.


Was exactly as described. Perfect plug and play for my 2018 F150

2019 Ford F-150

This was pretty easy to install, and it works great! The only hard part was the tight connection where the truck harness is mounted to the frame. I suggest cleaning with a pressure washer or something before you start to keep dirt from falling in your eyes while trying to disconnect your truck wire harness.

Ford F-150

Awesome kit. So much easier than having to remove taillight and splice into my F-150 wiring. Just plugs into existing wiring harness.

James R.


1 year out, still working great.

2018 Ford F-150

Very easy to install but watch the video on the website, the connector is not as pictured or as located in the written directions that come with it. It literly took longer to run the wires along the frame rail and zip tie them to make the connections. I used the black 4 way holder and attached it to my bumper bit i don't like it, if i was to do it over i would just hide it behind the license plate. 2018 F150 XLT 4x4



Still working great

2018 Ford F-150

The taillight wiring kit came with a 4-pin connector. I will be replacing it with a 7-pin connector. Routing the wiring from front to back is not an easy task on a 2018 F150. After installation all the lights worked an needed.

2016 Ford F-150

Works perfectly on my towed 2016 F150.


Fast delivery good product as always.


Fast shipping, good deal

2018 Ford F-150

Very happy with etrailer for the purchase of a Blue Ox tow bar with needed hook ups for lights, etc and an Air Force One Brake system for my 2018 F150. Crystal did a great job of comparing options and matching pricing from across the web. She offered free installation. The Installer, Shane was awesome, I wanted all hookups hidden by the front plate on the F150 when not towing, Shane came through and then some. Finally, the manager Robert was excellent on follow-up as we had some air leak once we got home. etrailer stood behind everything and follow was exceptional. Very pleased!

2016 Ford F-150

This kit made wiring my factory tail/turn/stop lights so simple I wish I had done this much earlier. Since my F150 had the traffic detectors in the tail light housing I didn’t want to start modifying them with diodes, etc. I already had trailer light wiring to the rear of the truck from a six way plug at the front. I used this to plug in a homemade light bar that worked ok but was not optimal to my way of thinking. The Hopkins kit that plugged directly into the factory harness was perfect. It is clean and simple and makes me happy knowing there is no unnecessary mods to the factory wiring.

by: 04/20/2022

The left turn signal on my toad stopped working. I will probably need to take the entire harness out and replace it. It was a great idea if it still worked.

Etrailer Expert

Jenny N.


I would start with testing for the left brake signal going into the black converter box and then also coming out of the black converter box. If the signal is coming through, then further testing would be needed to see where it is not. If there is not a signal, then the harness would need replacing as you have theorized.

2018 Ford F-150

This is awesome,no splicing of wires plugs into existing wire harness on 2018 F 150



Still going strong!

Ford Transit Connect

My daughter moved the package indoors while I was on vacation. I did not open the package until 9 months later when I first needed it. Part of the components were missing. The box was damaged in transit. etrailer went above and beyond to insure that I received the parts needed to use the unit. Great customer service. I am a very satisfied customer. etrailer is a pleasure to have as a supplier.
They worked with me when they were not bound to do so, which is a great quality to have these days. More companies should treat their customers like this.

2018 Ford F-150

Ordered the Hopkins tail light wiring kit for my 2018 F150, it fit OEM wiring perfectly. The order came when scheduled and am very pleased, now just need time to hook up to my RV.


Awesome experience with etrailer. They helped me get exactly what I needed. I recommend them to everyone!!!!


Light kit was delivered very fast. Went together and worked as advertised. Always had good service from etrailer.



Excellent, easy to install.


Excellent product great factory like weatherproof connects. Plug & play hardest part was to run the wiring harness to the front of the vehicle. Which really was not hard at all, I would definitely recommend this product to anyone wanting to flat tow their vehicle.

2018 Saturn Relay

Just what I needed for my 2018 F-150. My Lariat has the LED tail lights and this kit works. I added the relay kit RM-88400 as well.


I will be installing this on Friday Aug. 14th, I have looked through all of the installation videos, and will be connecting this to a 6-way round connector. Thanks for all of the online information, it is great!!

2018 Ford F-150

Ford has at least three different electrical wiring plugs all about the same size, the picture really doesn’t show what is actually there! Try them all, once you find the right plug, all works fine!


Hopkins has great products for more then half off from what the the plate makers are selling.
This is my second purchase and these kits work great, supper easy install and work as they are supposed to.
Don't buythe cheaper bulb kits when for the same price you can have a plug and play kit from Hopkins and etrailer.

2018 Ford F-150

I just installed the wiring harness (HM56009). It was very easy, just plug and play. It only took about a half hour to install.


Excellent product, great quality, insulation instruction were fantastic with great details, simple to follow, complete with actual underneath frame pictures of my make, model and year of truck, that made install quick and fool proof, it’s been installed for one year with no issues. Well worth the money.

Show More Reviews

See what our Experts say about this Hopkins Tow Bar Wiring

Do you have a question about this Tow Bar Wiring?

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Lindsey S
Edited by:
Lindsey S
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Dustin K
Video by:
Dustin K
Employee Jonathan Y
Video by:
Jonathan Y
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Hannah L
Updated by:
Hannah L
Employee Alexander C
Written by:
Alexander C
Employee Shane H
Test Fit:
Shane H
Employee David F
Test Fit:
David F
Employee Bradley B
Test Fit:
Bradley B

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-940-8924