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Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Item # HM56008
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Tow Bar Wiring

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Hopkins Plugs into Vehicle Wiring - HM56008
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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 HM56008 can be ordered online at or call 1-833-496-1390 for expert service.
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  • Reviews (6)
  • Q & A (0)
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Hopkins Tow Bar Wiring - HM56008

  • 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.

56008 Hopkins Plug-In Simple Dinghy Towing Harness

This Product Fits The Following Vehicles

  • 2012 - 2014 Ford Focus Hatchback - Automatic transmission
  • 2012 - 2014 Ford Focus Hatchback - Manual transmission

Customer Reviews

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles - HM56008

Average Customer Rating:  5.0 out of 5 stars   (6 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.


Easily installed works great.

2013 Ford Focus

I chose not to follow the etrailer video installation for this because I did not want to cut holes in the factory grommets. There is plenty of room to run the wires under the rear bumper cover. Hardest part is running the 4 pole connector back to the front of the vehicle. The Focus is very low and without a lift, its a challenge. It is also nearly impossible to run the 4 pole wires to the middle of the vehicle with the front bumper cover on after the tow bar has been installed. I tried for about 30 minutes before giving up and taking the front bumper cover off again.

2014 Ford Focus

Why pay $225 for this item at the base plate company, This item fit perfectly, has a great install video and is 1/3 the price!!!

2012 Ford Focus

The customer service representative was knowledgeable about the product.

Thank you for supplying the product and the video. The video was quite helpful.
Ken K - 11/12/2017

2014 Ford Focus

It was a breeze to install! Working great so far.

2016 Ford Focus

Very Good Service - Good Pricing


See what our Experts say about this Hopkins Tow Bar Wiring

  • Flat Towing Wiring Connections for 2014 Ford Focus with Automatic Transmission
    The white ground wire on a flat-towing harness like # HM56007 or # HM56008 will attach to the towed vehicle's frame or battery negative terminal. This will not have any effect on your Focus' transmission nor will it cause any issues with battery drain. When connected in this manner the ground will still eventually route back to the RV but you do not have to wire it as you describe. Do be sure to follow all of the steps outlined in your Focus owner's manuals for making the car ready for...
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  • Coiled Tow Bar Wiring Extension to Go from a 7-Way to a 4-Way Flat
    Yes, the tow bar wiring harness # HM56008 will work as a combined system, with the brake lights and turn signals on the same circuits. You could use ta 7-Way to 4-Way adapter either directly in the 7-Way on the RV or at the end of a coiled extension. But I was able to find a nice long coiled cable to go from a 7-Way to a 4-Way, # 787196.
    view full answer...
  • Tow Bar Lighting Recommendation for a 2016 Ford Focus
    For tow bar lighting for your 2016 Ford Focus hatchback you can use the diode kit, # RM-15267, and not have to worry about cutting into the taillight housing. This will splice into your taillight wiring to allow your tow vehicle to control the taillight assemblies of the towed vehicle. This comes with a round 6-way connector that you will install on the front of your towed vehicle and enough coiled wire to go from there to the RV. Since this is a hardwire kit it would not have any fitment...
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  • Tow Bar Wiring that Plugs into Tail Light Wiring on a 2014 Ford Focus
    If your 2014 Ford Focus ST is the 5-door model then you could use Hopkins tow bar wiring harness # HM56008. It also looks like the battery has to be disconnected on your Focus to flat tow it. Consult the owners manual to confirm. To keep a maintenance charge on the battery I recommend using a harness such as # BX88206 with the tow bar wiring you will be using so that you can run a wire from the connector at the front of the truck to the vehicle battery. There are a couple of ways to do...
    view full answer...
  • Will the Hopkins Taillight Wiring Kit for Flat Towing Work on a Vehicle with Disconnected Battery
    The Hopkins Taillight Wiring Kit for Flat Towing part # HM56008 that you referenced and watched the install video for does not draw power from the vehicle it is installed on so the battery being disconnected on your vehicle would not be an issue at all. All of the power it draws comes from the tow vehicle.
    view full answer...
  • Plug and Play Tow Bar Wiring Harness for a 2012 Ford Focus SE Hatchback
    Trailer wiring harness # 118549 gets the signals it needs through the tail light wiring on your 2012 Ford Focus hatchback. The power for the trailer lights comes from the connection to the vehicle battery. This wiring harness is if the Focus is towing a trailer and will not work in reverse (towing the Focus behind a motor home). For a similar harness that is set up to work as tow bar wiring and that plugs inline with the tail light wiring use # HM56008. The harness gets its power from...
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  • Recommended Wiring Extension to Connect 2012 Ford Focus Wiring Harness to Motor Home 7-Way
    To provide a permanent lighting connector on the front of your 2012 Ford Focus and a coiled wiring extension for flat towing I recommend the Blue Ox 7-Wire to 6-Wire, Coiled Electrical Cord # BX88206. This extension includes a 6-Pin socket connector that will mount to the Blue Ox # BX2633 base plate that you referenced, and the connector is black to help remain inconspicuous on the front of your Focus. This connector will require the 4-Way Flat connector that comes with the # HM56008...
    view full answer...
  • What Items Are Needed to Flat Tow a 2014 Ford Focus ST Behind a Motorhome
    Flat towing a vehicle behind a motor home requires a number of components: a tow bar, safety cables, a wiring/lighting kit, and base plates and a supplementary braking system for the towed car. Often a wiring extension between the MH and car and a high/low hitch adapter are also needed. The linked article covers each of these in detail and explains the options available. I recommend using one brand of tow bar and base plate since this will avoid the added cost and complexity of using adapters....
    view full answer...
  • Base Plate Recommendation For a 2015 Ford Focus SE Hatchback
    Good news, I can help you pick out the right base plate kit for your 2015 Ford Focus. Staying in the Roadmaster family since you have a Falcon # RM-520, the Roadmaster # RM-524443-5 and the Roadmaster # RM-524443-4 are both great fits for your 2015 Ford Focus SE Hatchback. Both will be compatible with your tow bar, just depends on how you would like the front of the vehicle to look after the install. The difference of the EZ4 and EZ5 is the mounting arms. The EZ5 has the arms that will...
    view full answer...

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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Victoria B
Expert Research:
Victoria B
Employee Laura H
Written by:
Laura H
Employee Alan C
Video by:
Alan C

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