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Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Item # HM56304
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Tow Bar Wiring

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HM56304 - Tail Light Mount 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 HM56304 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (92)
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Hopkins Tow Bar Wiring - HM56304

  • 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.

11156304 Hopkins Plug-In Simple Dinghy Towing Harness

Replaces 56304

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles - HM56304

Average Customer Rating:  4.8 out of 5 stars   (92 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.


I was not sure that I would be able to do this installation by myself until I looked at your videos. With your help, I had the installations along with the wiring completed in two days. Thank you for providing the video instructions for us. I would highly recommend to anyone who wants to have a hitch or baseplate installed, but thinks the cost of installation is to high right now. I saved nearly $1000.00 doing it myself, and I know that it was done the correctly. I received the items in good condition and in a timely manner. Thank You!


Great wiring kit for my Honda CRV rv tow vehicle. Matched perfect the 6 pin adapter I ordered also.

2012 Honda CR-V

Very easy installation with perfect ins tructions.


Easy install after viewing install vide o.

2013 Honda CR-V

However I am quite pleased with what I got and it was easily installed.

2014 Honda CR-V

Base plate video was very helpful, did in less than 3hours. Wiring for Honda CRV was easy to install.
All products were delivered on time. Would order any other products needed from etrailer.


I can't emphasize how much I appreciate that this kit is a true Plug-and-Play part! The hardest part was safely routing the wires around moving and/or hot vehicle components. I ended up ordering some plastic wire loom to further protect the wires. I had about one foot of excess wire length at the connector end after routing the wire from the driver's rear corner, underneath near the left rocker panel, up the driver's side of firewall near the brake booster, around the strut tower, the fuse box, behind the headlight, next to the radiator and alongside the driver's fog light and exterior temp sensor harnesses, and finally to the 6-pole connector that's mounted on the base plate.


This wiring harness had a bad diode in it when I installed it & etrailer replaced it without a problem. The 2nd one works great


Works fine

2014 Honda CR-V

The diode wiring kit performs great on my 2017 Honda CRV.
I do continue to have a dead battery after towing because e-trailer suggested pulling the incorrect fuse.
No one seems to know which fuse keeps the battery from dying. Not #14 and not #19. Still waiting for the correct fix here.


This wiring harness works great for operating the brake and turn signal lights on my 2012 Honda CRV using the existing bulbs. This is the second one I have installed. The first one I installed had the diodes burned out when I bought a new car battery, and the installer shorted the positive to the negative with his wrench when tightening the cable to the battery post. So, be careful about that.

After a year, it still works perfectly.
Michael - 01/13/2020

Honda CR-V

Good quality product. Easy to install on my CRV. Video by etrailer was very helpful. Love the fact that all I need to do now is plug the harness in to my RV. Because my RV connection is a 7 pin connector, now I have to rewire the CARB plug to a suitable 7 pin connector to go with my Roadmaster tow bar

Great! Toad lights work every time plus I now have a 12 volt feed to my toad battery. No more worries.
Robert H - 03/22/2018

2013 Honda CR-V

This was exactly the plug and go harness for flat towing that I had hoped for! The connections were easy, but running the harness from rear to front was more challenging; just the nature of the underbody. The installation video is excellent. I have used this wiring for the past problems. Would definitely reccomend.

It has been great-no problems whatsoever. In fact, I have recommended it to others.
john F - 12/11/2017


This product is very easy to install on Honda CRV 2014 and you have access to video installation from I recommend this HM56304, I have searched a lot and this is the best. you don't need separate diodes, this is perfect and operate very well.


Watched the video for my tow vehicle and was very easy to install. Much easier than splicing wires.


I was not sure about purchasing and installing the Hopkins Tail Light Wiring Kit for Towed Vehicles until I watched the etrailer's video instructions for installation. It gave me confidence to do it myself. Works as advertised for the last 8 months.

Works great. No problems.
Charles E - 03/06/2019


Easy install and works great.

Still working great. Great product.
Mark A - 10/08/2021


Bought this for my 2014 Honda CR-V toad. Nice clean installation with no need to cut wires to install. Good instructions included plus good installation video on etrailer.


Installed without any problems. Works great. No problems since installing.

2014 Honda CR-V

Product description very good and additional videos helped to install the product, shipping on time. I have installed but have not hooked to the motor-home to try it out but everything looks good no reason it should not work.

After using the Hopkins wiring kit for our 2014 CRV its has worked great and continues to be one of the best investments we have made in hooking up for flat towing. As others stated installation takes a little time but the videos that etrailer has online where very helpful.
Ray H - 05/14/2019


Easy to install, works great.


I purchased a wiring harness for our 2014 CRV so that I can use the vehicle as a dingy behind our new 2016 Thor Miramar. I installed the wiring harness myself. Been using it for a year now and have not had any problems. This is truly a plug and play device. You simply unplug the tail light connectors and insert this in-line and you're good-to-go.


2014 Honda CR-V

Product was exactly as described and matched my 2014 CR-V light system exactly. The installation video was very helpful and I was able to do the work fairly easily with only the use of 2 auto ramps on the drivers side (ds), although all 4 wheels up might have been easier. I had installed a trailer hitch earlier which hindered the crossing to the passenger side; however the porthole I had made for that installation on the ds aided in getting the wiring to the top of the ds rear wheel

Ford Flex

It was by far the easiest wiring kit to install plug it in no fuss ! Honda CR-V are not the best to work on because of the under carriage being all plastic. The VIDEO is the only way to go as far as route of harness and installing the only thing I did different was put flex tubing around harness for extra protection or peace of mind !!!
I'm telling you etrailer is the only way to go they have the best staff to get you what you need when you need it and products top of the line!!!


perfect fit and function plug and play easy install

Plug and play works great no issues
g m - 06/19/2020
Show More Reviews

Ask the Experts about this Hopkins Tow Bar Wiring

  • Troubleshooting Hopkins Custom Tail Light Wiring for Towed Vehicles on 2014 Honda CR-V
    Since you've already verified you're getting power at the rear of your motorhome we know it's somewhere after that. The first thing that comes to mind is check the ground wire on the harness. Make sure the connection point is a smooth, clean, metal surface. Possibly even relocate the ground to somewhere the metal of the vehicle is overlapping to increase the metal to metal contact. The next to inspect is the wiring itself from the front 4-way all the way back. You're looking for any...
    view full answer...
  • Tow Bar Lighting Recommendation for a 2014 Honda CR-V
    For tow bar lighting for your 2014 Honda CR-V I would recommend the Hopkins kit part # HM56304 which is a confirmed fit for your vehicle and would work with your current taillight setup. I attached an install video for this product on a 2014 CR-V just like yours for you to check out as well.
    view full answer...
  • 4-Flat Connectors for Flat Towing and Towing a Trailer on a 2014 Honda CR-V
    I took a look at the instructions and installation videos for both the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles item # HM56304 and the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118561. They attach at completely separate wiring harnesses in the rear cargo area of your 2014 Honda CR-V. These parts are compatible with each other. I have attached installation videos for both products so you can confirm.
    view full answer...
  • Towed Vehicle Wiring and Wiring Extension Recommendation for 2013 Honda CR-V
    The tow bar wiring I recommend for your 2013 Honda CR-V is the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles # HM56304. This is a custom-fit wiring harness that will plug into your vehicle wiring behind the taillights. I recommend this kit because of the ease of installation and the fact that the harness will prevent electrical feedback to protect your CR-V's electrical system. I have attached an installation video of this wiring harness on a similar vehicle as yours. You are...
    view full answer...
  • Availability of Tow Bar Umbilical Style Adapter to Go From 4-Way Flat to 7-Way Blade
    Yes, for a tow bar umbilical extension adapter to go between the 4-way flat of the part # HM56304 and a 7-way socket you'd want the Wesbar adapter part # 787196. This has a 5-way flat on one end and a 7-way blade connector on other. The difference between a 5-way and a 4-way is just the extra pin on the outside of the connector. This pin would simply be left off when used with a 4-way. I attached a link to a video for this adapter that shows it in use for you to check out as well.
    view full answer...
  • 2014 Honda CR-V Tow Bar Wiring and Supplemental Brake Recommendation
    Yes, the Hopkins Tow Bar Wiring # HM56304 that you referenced has been confirmed as a fit for your 2014 Honda CR-V and would work well with the Roadmaster InvisiBrake Supplemental Braking System # RM-8700.
    view full answer...
  • Would Flat Towing Wiring Kits Void the Warranty of a Vehicle
    There is a law called the Magnussen-Moss warranty act that states, in part, that if you install an aftermarket part on your car then it will not void the warranty unless that part caused the problem. So installing tow bar wiring like the # RM-155 or # HM56304, will not void the warranty. Check out the install videos I attached as well.
    view full answer...
  • Can Both Curt Vehicle Wiring And Hopkins Tail Light Wiring For Towed Vehicles Both Be Connected?
    Yes, you can use the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56158 to tow your small trailer with your 2014 Honda CR-V. You can also use the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles # HM56304 for when you are towing this CR-V behind your motorhome. They will function correctly as they are installed in different locations. I assume that you were asking if they can be used simultaneously regarding wiring and the answer is yes, however...
    view full answer...
  • Tow Bar Lighting Recommendation for 2014 Honda CR-V
    The best tow bar lighting for your 2014 Honda CR-V will be the Hopkins Kit part # HM56304 that requires no modification. It installs by simply plugging inline with the taillight harnesses and requires no cutting or splicing. I attached an install video for more info for you to check out as well.
    view full answer...
  • Tail Lights Work On 2014 Honda CR-V While Not Connected To Motorhome But Signals Stop After
    It sounds like you are having issues with the tail light circuits on your towed vehicle. If that is the case then I will need to know exactly what components you are using in order to offer specific advice but I can tell you that although the same bulb may be used for normal operation and flat-tow operation, they are not powered by the same source so it could very well be that the turn signals work normally but not when attached to the motorhome. I again will need to know exactly what components...
    view full answer...
    Image 1 for
  • Troubleshooting 4-Way Trailer Wiring Connector that Does Not Work
    First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # PTW2993 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue. Make sure that the trailer side connector are clean...
    view full answer...
  • Tow Bar Wiring Recommendation for 2012 Honda CR-V
    I attached an install video that shows the SMI Air Force One part # SM99243 installed in a 2014 Honda CRV that is similar to your 2012 model. For lighting the easiest solution will be to use a custom fit kit like the Hopkins part # HM56304 which plugs right into the taillight harnesses of your CRV. I attached an install video that shows this installed on a similar 2014 CRV just like yours.
    view full answer...
  • Roadmaster InvisiBrake Won't Release Brakes on 2018 Jeep Cherokee
    I reached out to the manufacturer, Roadmaster, in regards to the issues you are having with the Roadmaster InvisiBrake Supplemental Braking System # RM-8700 on your 2018 Jeep Cherokee. What they told me was that "it sounds like whoever did the install forgot to add silicone to the back of the six-way socket for weather proofing. I would ask the customer if it has recently rained or if they took their vehicle through a car wash. If so they will need to empty the water from the backside...
    view full answer...
  • Tow Bar Wiring and Fuse Bypass to Flat Tow a 2012 Honda CR-V Behind a Motor Home
    For your 2012 Honda CR-V and tow bar wiring the correct Hopkins part is # HM56304. the other harness you mentioned, # HM56300, fits 2007 to 2011 Honda CR-Vs. It also looks like you may need to pull a fuse to flat tow your CR-V. Check the owners manual to confirm. To make disconnecting power from a fuse as easy as flipping a switch you can use fuse bypass # RM76511. I have linked videos showing installations of the wiring harness and fuse bypass for you.
    view full answer...
  • 2014 Honda CR-V Brake Light On All The Time When Tow Vehicle's Runnings Lights On
    It sounds like you may have a short or a bad ground somewhere in your wiring. What you'll want to do first is inspect both the towed vehicle, and the tow vehicle's connectors. Make sure there is no corrosion or rust buildup in the connectors. Next, check your ground connections. Ensure that your ground connections are on a good, clean, part of the vehicle's frame. If the connections are loose, or corroded/rusted, the issue is most likely here. If your grounds check out, you'll then want...
    view full answer...
  • Does Hopkins Tow Bar Wiring have to be Unplugged for 2014 Honda CR-V Tail Lights to Work
    You would not have to reverse the installation of Hopkins tow bar wiring harness # HM56304 for the vehicle lights to work on your 2014 Honda CR-V when it is not being flat towed. The harness plugs in line with the tail light wiring so when you are not connected to the RV the lights will function like normal. And when you are connected to the RV the lights will get power to function from the RV. The wiring harness isn't available with a 4-Way round connector but you could use adapter #...
    view full answer...
  • Flat Towing Lighting Options for a 2016 Honda CR-V That Is Being Towed on a Trailer
    I have a solution for you. Since you have both a 7-way and 4-flat on your tow vehicle your best option would be to use one of the magnetic tow bar lighting kits we carry. I recommend the Optronics Magnetic Tow Lights, # TL21RK. Using this kit will eliminate wiring into your Honda's wiring. Both magnetic lights will have tail, turn, and brake light functions. The lights will plug in to the tow vehicle's 4-flat connector and the lights magnetic base can mount on the trailer or the vehicle....
    view full answer...
  • Base Plate Kit and Tow Bar Lighting Recommendation for 2014 Honda CR-V
    The 2014 Honda CR-V would need the base plate kit part # RM-521567-4 and you'd be able to connect to your Roadmaster tow bar setup. The trailer wiring of the Honda could not be used as tow bar wiring though. For that instead you'd want the part # HM56304 which plugs in line with your taillight connectors.
    view full answer...
  • Kit to Allow Battery Charge to Flat Towed Vehicle
    Roadmaster offers a kit that can be used to deliver a maintenance-level charge to a towed car's battery while it is being flat towed. Kit # RM-156-25 includes 14-gauge wire, a wire loom, circuit breaker, and hardware that allow a 15-amp charge to reach your battery. Please refer to the linked review and install videos.
    view full answer...
  • Recommended Option For Hauling A 475lb Scooter On A Flat Towed 2014 Honda CR-V
    You would need to install a high enough rated hitch on your 2014 Honda CR-V and use a high enough rated cargo carrier with a ramp to be able to also haul your 475lb scooter. For the hitch I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver # 75742, which has a 675lb tongue weight capacity. You'll need to also check your owner's manual to ensure that the vehicle is rated to handle this amount of tongue weight. For the cargo carrier I recommend the 30x50 Curt Cargo Carrier w/ 48"...
    view full answer...
  • Tow Bar Wiring Harnesses to Flat Tow a 2014 Honda CR-V Behind a Motor Home
    We have several tow bar wiring harnesses for the 2014 Honda CR-V. I have included a link to the options that will fit. A brake light relay should not be required if you use the SMI Air Force One. It does look like you will need to pull a fuse to flat tow the CR-V. Consult the owners manual to confirm. To make this as easy as flipping a switch you can use fuse bypass # RM76511.
    view full answer...
  • Where to Install Diodes when Installing Roadmaster Invisibrake with Tow Bar Lighting
    If you check out the picture I attached you will see where to install the diodes on your vehicle to install both the Roadmaster InvisiBrake Supplemental Braking System # RM-8700 and the part # HM56304 that you referenced. For a diode kit you would want the part # RM-794.
    view full answer...
    Image 1 for
  • Tow Bar Wiring Recommendation for a 2002 Chevy Tracker
    What you need for your 2002 Chevy Tracker is tow bar wiring to allow a tow vehicle to control it's taillights as it is being towed. For that you would want the Roadmaster diode kit part # 154-792-118158 that has been confirmed as a fit for your Tracker. I attached an install video for you to check out as well.
    view full answer...
  • 2012 Honda CR-V Flat Tow Fuse Bypass Switch And Wiring Between RV And Vehicle
    For your 2012 Honda CR-V, I double checked everything in your owners manual and have confirmed the Blue Ox Fuse ByPass Switch for Towed Vehicles - 2 ATM Mini-Fuse, # BX88273 is the switch you want for the two 7.5 amp fuses. They are in fact mini fuses. For your connection from your RV to your CR-V, I recommend cutting off the 4 way of your # HM56304 at the front of your CR-V and using the Blue Ox 6-Pole, Round Pin, Trailer Wiring Socket - Vehicle End, # BX294-0902. I've attached a video...
    view full answer...

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Info for this part was:

Employee Joe V
Test Fit:
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Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
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Employee Laura H
Written by:
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Employee Cole B
Installed by:
Cole B
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