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Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Item # HM56300
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Tow Bar Wiring

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Hopkins Wiring Harness Tow Bar Wiring - HM56300
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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 HM56300 can be ordered online at or call 1-800-496-5010 for expert service.
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  • Reviews (25)
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Hopkins Tow Bar Wiring - HM56300

  • 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.

Changing from a Separate to a Combined Lighting System

Your vehicle ordinarily operates on a 3-wire system, wherein the brake signal and the turn signals travel along different wires to illuminate different lights. (Typically, this means that your vehicle will have amber turn signals.) This is referred to as a "separate lighting system." When you hook up for flat towing using this harness, however, your towed car's lighting system will operate in a combined fashion. 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 - with separate lighting - 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.

11156300 Hopkins Plug-In Simple Dinghy Towing Harness

Replaces 56300

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles - HM56300

Average Customer Rating:  4.8 out of 5 stars   (25 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.


Very easy to install getting the wire to the front is the hardest part


Plug and play beats scotch locks everyday. 4 way ops simple 6pin to 4pin adapter, tested and operated successfully with only one follow up due to bulb failure.


Tammie P was very helpful and knew the products. Everything I needed was available and shipped very quickly. Order arrived in 3 days.


Having installed a diode kit on my previous toad. I wasn't looking forward to the business of cutting into the vehicle wiring harness and crimping in the 4 diodes and cramming all the wiring back into the taillight cavity and hoping I did it right.
While looking for videos on installing the kit I came across a video for installing the Hopkins kit.
I was able to return the do it yourself kit to etrailer without any problems and ordered the Hopkins kit.
It took longer to open up the panels in the cargo hatch than it did to hook up the preassembled kit. Probably the easiest chore in the making our 2007 Honda CRV into a towable vehicle. As close to plug and play as you can get .


Products that were purchased were as advertise and directions were very helpful to hooking up. It’s nice that you could find some helpful hints to your project through etrailer. When ordering products all the people are very knowledgeable friendly and helpful to make sure you get the right product for your project.


The wiring is working just fine advice to all people installing make sure you planned your wiring Route before you install that way you will have no issues or chasing wires On something you did not see.
John - 12/03/2018


My wiring kit arrived today, it was three days late but no fault of E trailer. I watched the online video several times and was able to install it in about 2 hours. The hard parts were getting the taillight plugs to release. Then as I have no lift I had to do the routing laying on the garage floor. Since the Honda CR-V is pretty low slung it was definitely difficult, the fact that I am 76 and not as spry as I was some years ago didn’t make it any easier. Bottom line, once it was done and plugged into my motorhome it worked perfectly. I would definitely recommend the plug and tow to anyone who wants to tow behind a motor home.

2015 Saturn Relay

Took 15 min to install. Should have done it months ago. No more magnetic lights. (Added brake relay which tool longer but still pretty easy)

2017 Jeep Wrangler

The service in delivering the Hopkins custom tail light wiring kit for my 2007 Honda CRV was very good except E-trailer sent me kit for a 2007-2010 Saturn Outlook! I called customer service the next day around 8:00 AM and Erin , who took my call, was very friendly and helpful in making the correction. Within 1 hour by e-mail she had the return UPS label for the Saturn kit sent to me and about 4-5 hours later I had a notice from E-trailer that the correct kit had shipped. I've purchased several items from E-trailer over the past 8-9 years, including a similar kit for my 2017 Jeep Wrangler 2 months ago, and this is the first error I've encountered. E-trailer quickly corrects any errors on their part so I'll probably continue to be a customer with them.

2009 Honda CR-V

I bought this item over a year ago, an it has done a great job, I would recommend, etrailer,on sales and products, and for a fair price

2010 Honda CR-V

Received the wiring kit on time and it was exactly what I wanted/expected. Thanks

Hi, did you install this yourself? If so, how difficult? Was it for a 2011 CRV?
-- comment by: Bruce N - 02/05/2016


Product well-built and a complete kit was furnished. My brother-in-law and I put it on our 2010 Honda CRV. It took most of the day to do it. Instructions were clear but it just takes sometime. Took the car and the motorhome out for a test drive yesterday and everything was working great. I would tell my friends about the product and encourage them to buy it if they are in the market for this.


All the products I ordered arrived on time and were exactly what I needed. The online ordering was easy and fast. They followed up with me and updated my order status to let me know everything. Great pricing as well.


Easy to install Good iinstructions


Steve T - 08/04/2022
Steve T - 08/04/2022


Works great, easy to install, quick del ivery


It's been a year and happy to report all is still working fine! No issues!


Easy to install and works as intended.



Easy to install never a problem

2007 Honda CR-V


2007 Honda CR-V

Looks great can't wait to install it in the car.


Easy to install in my driveway and it works perfectly.


Natalie did a super job and was very polite. Great product




See what our Experts say about this Hopkins Tow Bar Wiring

  • Hopkins Tail Light Wire Harness For 2011 Honda CRV
    We have the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles # HM56300. It is a custom fit wire harness that will work with your 2011 Honda CRV and will sync your lights together.
    view full answer...
  • Installation of Hopkins Custom Tail Light Wiring Kit for Towed Vehicles on 2008 Honda CR-V
    The wires for your Hopkins Custom Tail Light Wiring Kit for Towed Vehicles, # HM56300 is be run under the vehicle. Feed it through frame components as shown in the attached installation video for a 2008 Honda CR-V.
    view full answer...
  • Hopkins HM56300 Flat Towing and Tekonsha 118427 Trailer Wiring Harnesse Be Installed at Same Time
    You can certainly install the # HM56300 for lighting when flat towing and the # 118427 for towing a trailer. Since both will not be used at the same time they will work just fine with no interference. I have linked you to install videos showing both harnesses being installed on a 2011 CR-V, as well as to some FAQ articles about flat towing that you might find helpful.
    view full answer...
  • Can Flat Tow Wiring Harness for 2011 Honda CR-V be Connected to Trailer Wiring Harness
    That is an excellent question. The difference between a trailer wiring harness like the Curt # C55106 and a flat tow wiring harness like the Hopkins # HM56300 (similar to the Curt you mentioned) for your 2011 Honda CR-V is that the trailer wiring harness sends power to trailer lights while the flat tow harness receives power from your motorhome. So even though they connect to the same circuits, they serve different purposes so they aren't interchangeable. For a complete flat towing setup...
    view full answer...
  • Can Trailer Wiring and Tow Bar Wiring be Installed at Same Time on 2011 Honda CR-V
    The trailer wiring harness you have installed with the Hopkins tow bar wiring harness part # HM56300 that you referenced is your issue. If you want the # HM56300 to be functional you'll need to remove the trailer wiring harness. Another option would be to leave the trailer wiring installed and use a temporary wiring kit for flat towing wiring like the part # C6304 which is magnetic and attaches to the top of the vehicle.
    view full answer...
  • Fuse Bypass for Flat Towing 2009 Honda CR-V Equipped with Hopkins Harness HM56300
    When using Hopkins tow bar wiring harness # HM56300 you can use Roadmaster Fuse Bypass # RM76511 if you do not want to have to pull fuses when towing the car. It is not essential but it will make life easier. Please see the linked installation video.
    view full answer...
  • Installing A Tail Light Wiring Harness With A Brake-Lite Relay Kit On A 2009 Honda CR-V
    The Roadmaster Brake-Lite Relay Kit for Towed Vehicles Item # RM-88400 with splice into your stop light switch under your dash and into your fuse box. So no, you will not have to attach this to your brake light signal coming from the motorhome. The Hopkins Custom Tail Light Wiring Kit for Towed Vehicles Item # HM56300 will connect to your vehicle's tail light wiring and up to the motorhome using the 4-pole connector.
    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...
  • Is a Brake Light Relay Required when Using a Trailermate Wiring Harness on a 2007 Honda CR-V
    The proper Hopkins tow bar wiring harness for a 2007 Honda CR-V is # HM56300. The one that you referenced is for a Jeep Liberty and will not fit your CR-V. Because this harness wires your Honda CR-V as a combined system, a brake light relay # RM-88400 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 cars brake lights illuminate...
    view full answer...
  • Difference Between Hopkins # HM56300 and Tow Ready # TR118821 Flat Towing Wiring for 2010 CRV
    Both the Tow Ready # TR118821 and the Hopkins # HM56300 serve the same purpose, allowing the lights on your flat towed vehicle to operate in tandem with those of the the RV. The difference is that the Hopkins wiring harness is a plug and play installation, while the Tow Ready harness would require cutting and splicing into the existing factory taillight wiring harnesses. Because this harness wires your Honda CR-V as a combined system, a brake light relay (RM-88400 - sold separately) may...
    view full answer...
  • Is Brake Light Relay Required When Using Hopkins Tail Light Wiring # HM56300 in 2010 Honda CR-V
    The Hopkins Custom Tail Light Wiring Kit # HM56300 that fits your 2010 Honda CR-V does require a brake light relay # RM-88400 when used with a supplemental braking system like the Blue Ox Patriot # BLU37TR.
    view full answer...
  • What Base Plate Kit Do I Need To Use the Roadmaster Blackhawk Tow Bar on a 2011 Honda CR-V
    I believe you are referring to the Roadmaster Blackhawk 2 All-Terrain Tow Bar part # RM-422 which is compatible with the Roadmaster Crossbar-Style Base Plate Kit part # RM-521559-4. However, so long as it is a Roadmaster Tow Bar it can be used with this kit. For a flat-tow wiring harness, I recommend the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles part # HM56300 because it's a custom fit so no splicing is required. For a supplemental braking system, I recommend the SMI Stay-IN-Play...
    view full answer...
  • Parts Needed To Flat Tow 2011 Honda CR-V Behind Diesel Pusher
    We have everything you need. You are looking at five primary components for a safe flat towing setup; a base plate kit, a tow bar, safety cables, tow bar wiring, and a supplemental braking system. - Base Plate, etrailer Invisible Base Plate Kit, # e98956 - Tow Bar, etrailer SD Non-Binding Tow Bar - 6,000 lbs, # e34ZR (This includes the needed safety cables.) - Wiring Solution, Hopkins Custom Tail Light Wiring Kit for Towed Vehicles, # HM56300 along with, Brake-Lite Relay Kit, # RM-88400 -...
    view full answer...
  • What Base Plate do I Need to use the Roadmaster StowMaster on my 2008 Honda CRV?
    We have a solution but the Roadmaster Direct-Connect Base Plate Kit part # RM-521559-5 has the direct connect attachment points that will not line up with the Roadmaster StowMaster Tow Bar part # RM-501 attachment points. Instead the Roadmaster Crossbar-Style Base Plate Kit part # RM-521559-4 has the required crossbar style connection and will allow you to attach your StowMaster without issues. For a wiring harness to operate the CR-V lights while you're towing I suggest a custom harness...
    view full answer...
  • When Flat Towing a 2007 Honda CR- V, Is Roadmaster Falcon 2 Tow Bar Compatible?
    Yes, you can use your existing tow bar, the Falcon 2 Tow Bar # RM-520, with your 2007 Honda CR-V as long as you do not have a model with a brush guard. The Falcon 2 is compatible with all Roadmaster vehicle-specific base plates. I recommend the Roadmaster EZ4 Base Plate Kit, # RM-521559-4. This kit has removable arms and the Twistlock brackets are virtually invisible, easy to mount and simple to remove. I've attached a couple of photos so that you can see what the base plates will look...
    view full answer...
  • Will Roadmaster Blackhawk 2 Tow Bar Work with Roadmaster Base Plates for a 2010 Honda CR-V
    Yes, the Blackhawk 2 All Terrain tow bar will fit the XL base plates # RM-521559-4 for the 2010 Honda CR-V. Since you have already been flat towing, you probably already have safety cables but in case you do need cables use # RM-645. These are straight cables that you can use in the cable guides on the Blackhawk tow bar. You will also need lighting for the CR-V. If you are using a magnetic kit like # RM-2120 or something similar then you can continue to use that with the CR-V. If you want...
    view full answer...
  • Parts Needed to Flat Tow 2008 Honda CR-V Behind Motorhome
    Your 2008 Honda CR-V is a popular vehicle for towing behind a motorhome and we can help you get yours all set with the items needed for safe and legal flat towing. The linked overview article has lots of helpful information and is a great place to start your planning. Let's start with a baseplate for the CR-V. For this I recommend the Roadmaster EZ5 kit # RM-521559-5. This base plate features removable arms with a handy twist-lock attachment so there are no pins to get lost. The arms can...
    view full answer...
  • Parts Needed to Flat Tow a 2007 Honda CR-V Behind a Motorhome
    Yes, I will be happy to tell you what you will need to flat tow your 2007 Honda CR-V behind your motorhome. There are 5 major components needed: base plates, tow bar, safety cables, lighting, and supplemental braking. For base plates I recommend Roadmaster EZ5 base plates # RM-521559-5. These base plates are compatible with all Roadmaster RV mounted tow bars. And when the arms are removed the base plates are basically invisible so they will have a minimal impact on the visual appearance...
    view full answer...
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  • How to Flat-Tow a 2012 - 2014 Honda CR-V with All Four Wheels Down
    In order to flat-tow a 2012 - 2014 Honda CR-V with all four wheels on the ground behind a motorhome you are going to need a tow bar, base plate kit, safety cables, tail light wiring harness, supplemental braking system, and possibly a high-low adapter. There may also be a few other smaller components that are needed depending on the options the vehicle is equipped with. For a tow bar, I recommend the Roadmaster Nighthawk All Terrain Tow Bar part # RM-676. The Nighthawk is one of the best...
    view full answer...

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