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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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In Use/Installed

  • 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. 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 or call 800-298-8924 for expert service.

  • All Info
  • Reviews (6)
  • Q & A (9)
  • Videos (2)
  • Photos
  • Why etrailer?

Hopkins Tow Bar Wiring - HM56002

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

2011 - 2015 Lincoln MKX

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 Custom Tail Light Wiring Kit Installation - 2014 Lincoln MKX

Today on this 2014 Lincoln MKX, we're going to install part number HM56002. This is a Hopkins Custom Taillight Wiring kit for towed vehicles. First off, we're going to open up the tailgate to get access to the taillights. We're going to use an 8mm socket to remove these bolts. We'll go ahead and just work our light loose, there's two pins right that's holding it in place after you unscrew it. We'll disconnect the wire harness right here, we'll push on this tab and pull it apart.

We'll repeat this for the other side. Now we can go ahead and start working with our new wire harness. Quick little tour, our 4-Pole end will be ran eventually up towards the front of the vehicle. This wire harness with the green wire will be ran over to the passenger's side. The shorter wire harness with the yellow wire will go over to your drvier's side. First off, I'm going to take our 4-Pole wire harness and we'll go ahead and drop it down between the bodywork and the bumper cover on the driver's side.

This is a really tight inaudible 00:01:21 between the bumper cover and bodywork so we're actually going to loosen up these fasteners here to give us some working room. Now these are just basically plastic rivets but you can use a Phillips head screw to back out the centers. Then loosen them up and pull out the rest of it and set it aside and put them back in later. All right, we'll use this very fine screwdriver to pull up the rest of this. We're going to pull up our bumper cover just a little bit and drop it down through. We'll take our Diode box and we'll go ahead and route it, our wires up through here and into the area right below the light.

While we're at it we'll go ahead and connect these two matching ends together until they click and the remaining end will eventually go back to our taillight. Let's just set that in there for now. Then our other half of our wire harness, we'll go ahead and hide underneath here and go over to the passenger's side. We're going to aim for our wire harness to be about right in this area here underneath our bumper cover and then our rivets will hold everything in place. Let's go ahead and make our connection back here as well. All right, we'll go ahead and bundle up our wires with some zip ties that come with the kit.

Go ahead and bundle up our wire on the passenger's side and then we'll go ahead and reinstall our rivets. Now look underneath to go ahead and check our wires that ran across and actually we can see them pretty good so we'll use that to our advantage and let's go ahead and zip tie them to the factory wire harness right here. We'll go ahead and cut off our tails to our zip ties. At this point we can go ahead and take a moment to reinstall our taillights. Our other half of our wire harness will go back into the taillight and we'll go ahead and push it back into place. Put the little plastic rivets in if you'd like. All right, at this point we can go ahead and take our wire at the 4-Pole end and we'll go ahead and route it up to the front of our vehicle. When we do that we want to stay away from anything moving like the suspension components or anything hot like the exhaust. Once we get up to the front, we want to stay away from anything moving like steering components as well. We'll go ahead and show you how we ran our wire and then we just continued on over the top here, zip tied to this line here and then we found the wire harness on top of the sub-frame for rear suspension and zip tied to it and just followed it on down. Went around the gas tank, came back over here by the parking brake cable and zip tied it and used some empty slots that's holding here for lines and just followed that on through, we zip tied as soon as we could. Next what we're going to do is take our wire and we'll go ahead and pull it up towards the top of the engine compartment because some supplemental braking systems need access to this wire. We'll go ahead and pull it up towards the top and to do that, we're using an old piece of air line tubing, this can also be any type of wire that can hold its shape and you run it down from the top to the bottom. We're going to attach our 4-Pole to our wire pull and just pull it on up. Mine's going to go around the brake lines so I'm going to guide it by hand first to go through there and that should be the only obstruction. We'll go ahead and pull the rest to the top. I'm just going to take my wire here and I'm going to route it up and around the battery and around the box here as well, maybe around the fuse panel as well. Then I'm going to go straight right back down in front of the engine and we'll come out to the front of the vehicle down by the bumper. All right, we've got it routed down for now, let's go ahead and take a few moments and we'll zip tie our wire to keep it from moving up here. Now when we pull down our wire, we made some adjustments so it wouldn't sit on the radiator hose and we hid it behind these hoses as well and we're just going to come straight down. Now we'll go ahead and route our 4-Pole wire harness to the center of our base plate on our vehicle. To help us go over a little bit, we're going to remove this plastic rivet and then put it back into place. This will also help hold our wire in place as well. Just catch the edge of the center of the rivet and just work it out. A small screwdriver works best to get it started and then a larger one or a trim panel tool will work to get the rest of it out. All right, I'm just going to move my wire past that rivet and then we'll put the rivet back in. All right, let's go ahead and route our 4-Pole on over to the center. We'll go ahead and attach our ground wire to this crossing bar using this provided self-tapping screw. Now this screw uses a 1/4 inch hex driver. Typically the sub-frame is not going to ground into the body so we just ran a jumper wire from our sub-frame assembly up to our body work right here. We just used a simple piece of 10 gauge wire, two ring terminals and some self-tapping screws, anything to get a metal connection from here to here will work. Also you could take the white wire extend it and run it up to the battery or a body ground somewhere else. Now our last connection, really, is just to go ahead and find a place to mount our 4-Pole wire harness. This is the bracket that comes with it and also comes with a cover. We'll go ahead and put the cover on first. It just slides over top and friction holds it in place and our bracket will just clamp around it, make sure you've got the cover route through this edge here, put it back over itself and just push it together. Now there are two screws that you can mount this to wherever you like on your vehicle. Again, this is going to be personal preference. It looks like it fits right in the grille here but what I think what I'll do since we don't really have any access to drill or anything, I think we'll just go ahead and use some zip ties to go through the slots and to this bar right here in the grille. Cut off our tails as close as possible. All right, once you're satisfied with the placement we'll go ahead and apply power to it to make sure the lights work in the back. All right, let's go ahead and apply power to it. First we'll go ahead and try the running light circuit. Now our right turn signal and now our left turn signal. We'll go ahead and take a look at our brake signal. All right, it looks like everything works. That will finish it for our install of the Hopkins Custom Taillight Wiring kit for towed vehicles, part number HM56002, on our 2014 Lincoln MKX. .

Customer Reviews

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles - HM56002

Average Customer Rating:  4.2 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.

- 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
Do you have a question about this Tow Bar Wiring?

  • 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 # BX7365. This tow bar has a weight capacity of 6,500 lbs and includes the safety...
    view full answer...

  • 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...

  • 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 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...

  • 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...

  • 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...

  • 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...

  • 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...

  • 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...

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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
Photos by:
Jim W
Installed by:
Cole B
Updated by:
Sarah W
Photos by:
Stacy F

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