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

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Item # HM56109
Our Price: $62.60
You Save: 39%
Tow Bar Wiring

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Hopkins Custom Tail Light Wiring Kit for Towed Vehicles Wiring Harness HM56109
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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. Lowest Prices for the best tow bar wiring from Hopkins. Hopkins Custom Tail Light Wiring Kit for Towed Vehicles part number HM56109 can be ordered online at or call 1-800-496-5010 for expert service.
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  • Reviews (10)
  • Q & A (0)
  • Photos
  • Why etrailer?

Hopkins Tow Bar Wiring - HM56109

  • Wiring Harness
  • Plugs into Vehicle Wiring
  • Custom
  • Tail Light Mount
  • 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 behind your vehicle's tail lights
  • 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 behind your car's tail light assemblies. 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.

11156109 Hopkins Plug-In Simple Dinghy Towing Harness

Replaces 56109

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles - HM56109

Average Customer Rating:  4.7 out of 5 stars   (10 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.

2010 Chevrolet Colorado

It worked out well. Clean and very easy and all my lights worked from the start with no problems. I would buy it again.


This kit is one of the rare things that actually turn out better than I expected! It fit exactly as advertised and has worked without an issue since the day I installed it. I'm really happy with this wiring kit!!


Easy to install


Ordered a wiring harness for towing a vehicle behind my motorhome. Danielle was super helpful and a pleasure to work with during the ordering process. She was able to expedite the order and it arrived when it was supposed to arrive. Installation was very easy and works as it should. Very impressed with etrailer customer service.


Easy to install


Easy just plug in and drive


Works great.



Haven't installed it yet but the customer service was great



See what our Experts say about this Hopkins Tow Bar Wiring

  • Tow Bar Lighting Recommendation for a 2005 Chevy Colorado
    Trailer wiring cannot be used in reverse to power the taillights it is connected to for tow bar lighting. You will need to go with a tow bar lighting like the part # HM56109. This will plug inline with your current taillight harnesses (most likely like your current trailer wiring), and will work to power the taillights while your 2005 Chevy Colorado is being flat towed. I attached a help article on flat towing for you to check out as well.
    view full answer...
  • Installation of Flat Towing Wiring Harness HM56109 in 2011 GMC Canyon
    Hopkins Plug-N-Tow (R) Vehicle Wiring Harness # 41165 includes a converter module that processes the lighting signals from your 2011 GMC Canyon before sending them on to your trailer. This module will be damaged if fed lighting signals from a motorhome. Before you flat tow the Canyon unplug the trailer harness # 41165 and plug in the Flat Towing harness # HM56109. You will also want to check your GMC owner's manual for any instructions regarding preparing the vehicle for flat towing....
    view full answer...
  • Will the Roadmaster Even Brake # RM-9400 Work on a 2008 GMC Canyon
    The Roadmaster Even Brake Portable Braking System, # RM-9400, will work on your 2008 GMC Canyon as long as it does not have an active power assist braking system. The need for the Brake Light Relay, # RM-88400, will depend on the tail light wiring harness you choose to use. Since your GMC Canyon has a separate tail light system, meaning the turn signal and brake lights use separate bulbs in the tail light assembly, you will only need the brake light relay if you use the Hopkins Wiring...
    view full answer...
  • Blue Ox Parts Needed to Flat-Tow a 2010 GMC Canyon
    In order to flat-tow a 2010 GMC Canyon you'll need a base plate kit, tow bar, safety cables, braking system, and lighting. I have attached for you below a list of parts using the ones you were interested in. Blue Ox Base Plate Kit part # BX1656 Blue Ox Acclaim Tow Bar part # BX4330 Blue Ox Patriot Portable Braking System part # BLU37TR Roadmaster 12 Volt Outlet Kit part # RM-9332 Hopkins Custom Tail Light Wiring Kit for Towed Vehicles part # HM56109
    view full answer...
  • Recommendations For Parts Needed to Tow 2012 GMC Canyon With Towbar Blackhawk 2 Behind Motorhome
    When towing a vehicle with a motorhome there are five components needed: baseplates for the towed vehicle, towbar, safety cables/chains, lighting system, and supplemental braking system. Starting with the baseplate, as long as your 2012 GMC Canyon is not the Z71 or Xtreme model, then RoadMaster XL Base Plate # 3122-1 will fit your truck. If your 2012 Canyon is the Z71 model then RoadMaster XL # 3164-1 is the correct baseplate kit for your truck. Both kits have removable arms and will...
    view full answer...

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Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Lindsey S
Written by:
Lindsey S
Employee Dustin K
Video by:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Bradley B
Installed by:
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