1. Tow Bar Wiring
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  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 # HM56002
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Tow Bar Wiring

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HM56002 - Wiring Harness Hopkins Plugs into Vehicle Wiring
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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 HM56002 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (7)
  • Q & A (10)
  • Videos (2)
  • Photos
  • Why etrailer?

Hopkins Tow Bar Wiring - HM56002

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

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.

11156002 Hopkins Plug-In Simple Dinghy Towing Harness

Replaces 56002

This Product Fits The Following Vehicles

Video of Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Hopkins Tow Bar Wiring - Plugs into Vehicle Wiring - HM56002 Review

Speaker 1: Today we're going to be taking a look at the Hopkins Custom Tail Light Wiring Kit for towed vehicles. Now this product is designed to fit a 2011 to 2015 Lincoln MKX. To ensure or double check that this is a fit for your vehicle, you can use the vehicle fit guide at etrailer.com. This unit lets you wire your vehicle to accept your RV's tail, brake and turn signal lights for flat towing situations. It provides a four way flat plug at the front of your towed vehicle to easily connect to the RV. It does come with a dust cap for that connection point, that way you cover up the connectors when the plugs not in use.This box right here is a dinghy/diode converter, this prevents electrical feedback to safeguard the towed vehicles electrical system.

This is a weatherproof box that keeps a built in diode to protect it. Now this system will not interfere with the electrical system when you're towed vehicle is not hooked up to the RV, and it's designed to connect quickly and easily, all you got to do is locate connection points behind your vehicles tail lights and plug in your connectors. And then you'll need to mount the converter box to a safe, out of the way location, run the four way all the way up to the front of the vehicle, and then use the included bracket to mount the four way in an area that's easily accessible.It does come with the hardware to get that bracket mounted. This four way simply just goes in between here, clamps, and then it's always easily accessible at the front of the towed vehicle. Once you have that done, you'll need to make a ground connection, that's your white wire with the ring terminal attached to it.

You want to get that grounded to a suitable grounding location with the included grounding screw. And then you can secure any slack or excess wiring with the included cable ties. It does come with terminal grease, so you can apply this to all the connectors. This grease is specifically designed to help prevent corrosion to the connection points.The unit also comes with detailed installation instructions to help walk you through that whole process step by step. But that's going to do it for today's look at the Hopkins Wiring Harness for towed vehicles..

Customer Reviews

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles - HM56002

Average Customer Rating:  4.3 out of 5 stars   (7 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.

- HM56002

Easy installation and fast delivery. 721736

- HM56002
2012 Lincoln MKX

This is a very well designed wiring harness. Frankly I had more trepidation doing the wiring for our new toad than installing the tow plate hardware. Other kits required splicing into existing wiring. This one was so simple to plug in between the existing plugs and the tail lights. Etrailer's how-to install videos make this a very simple install. 511405

- HM56002
2014 Lincoln MKX

Need to add instructions to add a body ground to battery or body somewhere. Mine did not work! After hours of trouble shooting found it barely lit my test light! A typical ground problem, added another ground to battery every thing works fine now. Please pass this on.will save someone a lot of head aches! 505647

- HM56002

Fast delivery, correct parts, THANKS! 391448

- HM56002
2013 Lincoln MKX

This is one of the easiest installations of a wiring harness I have ever done. I have recommended it to all my friends. Great product. 365174

- HM56002
2015 Lincoln MKX

Wiring harness was easy to install. Harness was well made 353176

- HM56002
2013 Lincoln MKX

did not fit across the back of our MKX so had to add some wire and splice it in but it did work when it was done 136443


Ask the Experts about this Hopkins Tow Bar Wiring

  • Parts Needed to Flat Tow 2016 Lincoln MKX EcoBoost, Adaptive Cruise Behind RV with Aladdin Tow Bar
    For your 2016 Lincoln MKX with EcoBoost motor and adaptive cruise control you can use Roadmaster base plates # RM-524447-4. In order to use these base plates with your Blue Ox tow bar you will need adapter # BX88178. If you do not already have safety cables I recommend # RM-643. the coiled design helps keep the cables off of the ground. For lighting you can use diode kit # RM-15267 or if you will not be towing the vehicle often I recommend a magnetic kit # C-ATL20A. You may also...
    view full answer...
  • Will Hopkins Custom Tail Light Wiring Kit HM56002 Fit 2011 Lincoln MKX
    The Hopkins Custom Tail Light Wiring Kit # HM56002 is confirmed to fit the 2011 Lincoln MKX. This wiring harness will provide you with a 4-way flat connector at the front of your vehicle to connect to your RV while flat towing. I have attached help articles on the basics of flat towing and an overview of tow bar wiring. In order to flat tow a vehicle, you will need base plates, a tow bar, safety chains, tow bar wiring, and a supplemental braking system. If you need a baseplate for...
    view full answer...
  • Is a Fuse Bypass Needed to Flat Tow a 2016 Lincoln MKX and What is the Flat Towing Procedure
    There is not a fuse bypass for the 2016 Lincoln MKX because no fuses have to be pulled to flat tow it. I confirmed this by checking the recreational towing section in the owner's manual (pages 267 to 268). The procedure outlined in the manual is as follows: Put your climate control system in recirculated air mode to prevent exhaust fumes from entering the vehicle. If you tow your vehicle with all four wheels on the ground: Tow only in the forward direction. Release the parking...
    view full answer...
  • Parts Needed to Dinghy Tow 2016 Lincoln MKZ Sedan
    Yes, you can flat tow your 2016 Lincoln MKZ with the V6 3.7L engine. The car can be put into Neutral Tow mode for flat towing by following the preparation steps outlined on page 247 of the online owner's manual. You'll need base plates, tow bar, safety cables, a wiring/lighting kit, a supplemental braking system and a high-low hitch adapter. For base plates I recommend Roadmaster Direct-Connect base plate # RM-524436-5. For a matching tow bar use Falcon All Terrain tow bar # RM-522. For...
    view full answer...
  • Are Feedback-Preventing Diodes Included in Hopkins Tail Light Wiring Kit for Towed Vehicles HM56002
    The Hopkins Custom Tail Light Wiring Kit for Towed Vehicles # HM56002 is a confirmed fit on your 2013 Lincoln MKX and when using this harness to flat tow the car the integrated diodes prevent feedback from RV for safe operation.
    view full answer...
  • Recommended Parts for Flat Towing a 2013 Lincoln MKX
    The first thing that we will want to look at for your 2013 Lincoln MKX is a base plate kit so that we can attach the tow bar to your Lincoln. I recommend using the Blue Ox Base Plate Kit # BX2625 because it is very easy to use, and when you are not towing your MKX you can remove the base plate tabs for a better look when driving it around. The tow bar that I recommend for your setup is the Blue Ox Alpha # BX7380. This tow bar has a weight capacity of 6,500 lbs and includes the safety...
    view full answer...
  • Base Plate and Flat Towing Equipment Recommendation for 2016 Lincoln MKX
    Actually, in our fit guide we list the # 524447-4 base plates as being a fit for the 2016 Lincoln MKX regardless of whether it has the EcoBoost engine or the Adaptive Cruise Control with no mention of the air shutters. The base plate is indeed a fit for vehicles with the Active Air Shutters, and I'll have that information clarified. According to my research, your 2016 Lincoln MKX is capable of being flat towed, but exceeding 65 mph is not recommended. There are very specific flat towing...
    view full answer...
  • Is a Brake Light Relay Required for Installation of Flat Towing Lighting on a 2013 Lincoln MKX
    The Hopkins Tow Bar lighting kit part # HM56002 has been confirmed as a fit for your 2013 Lincoln MKX so it would work well for you. To determine if a brake light relay # RM-88400 is needed to properly wire your vehicle to be towed, answer the following questions. Are you using a supplemental braking system that depresses the brake pedal in your towed car? No - You do not need a brake light relay. Yes - You may need a brake light relay. Continue on to the next question. Do...
    view full answer...
  • Replacing Tow Bar Wiring 4-Way Connector with a 6-Way on a 2011 Lincoln MKX
    On the Hopkins tow bar wiring harness # HM56002 on your 2011 Lincoln MKX you will have to cut off the 4-Way flat end and hardwire each of the wires to the back of the 6-Way contained in kit # RM-98146-7. I have included a link to a help article that shows how various connectors are wired including a 6-Way and 7-Way to help. Remember that the 6-Way end at the front of the Lincoln is a vehicle side and not a trailer side.
    view full answer...
  • Parts Needed To Flat-Tow a 2014 Lincoln MKX
    In order to flat tow a 2014 Lincoln MKX you will need a base plate kit, tow bar, supplemental braking system, safety cables, a flat-tow wiring harness, and a few other smaller items. Although we do not sell a complete all inclusive kit, I have attached for you below a list of all the parts that you will need. Roadmaster Base Plate Kit part # 4408-1 (Without Adaptive Cruise Control) or part # 4408-5 (With Adaptive Cruise Control) Roadmaster Nighthawk All Terrain Non-Binding Tow Bar...
    view full answer...

Do you have a question about this Tow Bar Wiring?

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Info for this part was:

Test Fit:
Joe V
Edited by:
Leah B
Video by:
Andrew K
Written by:
Lindsey S
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Installed by:
Cole B
Updated by:
Sarah W

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