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Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Item # HM56204
Our Price: $70.43
Tow Bar Wiring

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Tow Bar Wiring HM56204 - Custom - Hopkins
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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. Great Prices for the best tow bar wiring from Hopkins. Hopkins Custom Tail Light Wiring Kit for Towed Vehicles part number HM56204 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (28)
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Hopkins Tow Bar Wiring - HM56204

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

11156204 Hopkins Plug-In Simple Dinghy Towing Harness

Replaces Tow Daddy 3008 and Hopkins 56204

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles - HM56204

Average Customer Rating:  4.8 out of 5 stars   (28 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.


Great product and easy to install. Would recommend this wiring kit.


The technical support was right on the money for this wiring kit. It works and performs exactly as described; another reason for my return to etrailer for accessories for my RV and other vehicles.

Ron J.


Working great and was easy to install. I have also towed my sons cargo trailer and all lights worked fine. Many thanks to your customer service techs for steering me in the appropriate direction.


We were on the road for four months and 10,000 miles, everything good! Easy hook-up and no problems.

2011 Jeep Liberty

The Hopkins kit worked perfectly, no surprises or modifications needed. Made electrical hook up to my motorhome seamless, 2003 National RV Seabreeze and 2011 Jeep Liberty. I highly recommend this wiring kit for the Jeep Liberty.

2012 Jeep Liberty

I purchased this harness for our 2012 Jeep Liberty so we could tow it behind our motorhome using the jeeps own tail lights for brake and turn signals. The harness works perfect and was a easy plug and play install with the exception of having to install one self-tapping screw for the ground (included). It also comes with a plastic bracket to in install the 4 flat connector on the front of the jeep which also works well! My only dislike is the wires of the harness are not incased in any form of wire loom to protect them from the elements or rubbing on other parts of the jeep which could easily damage the wires so I purchased some 3/8 and 1/2" wire loom and installed it my self but other than that it seems to be a great harness!

Jeep Liberty

I recently purchased a Blue Ox tow bar, towed vehicle brake system and three wiring harnesses for towing my Jeep Liberty with our motorhome. was my first choice for the purchase for these items worth almost two thousand dollars. Even though these prices were set by the manufacturer, I knew I could trust these folks. Their salesmen, (in this case Wayne H.), are more than just order-takers. They know what they are selling and are a good source of information on a variety of related products. When Wayne wasn't available for follow-up discussions, the operator took my cell number. Surprisingly, Wayne got back with me right away and supplied me with his direct line in case I had any questions. I've had experience with others dealers who don't get back for hours if at all. Bottom line: will continue to be my first choice for RV and other related items.

2012 Jeep Liberty

The kit was a Hopkins kit. These are all generally well make with good instructions. What makes the difference is where you purchase it from. Etrailer and Nicky K is who gets the five stars. These folks could not be easier to deal with. They stay in touch from the moment of the sale until after the sale and then even ask you how the install went. In todays online market I'm not sure how etrailer has put together the team and website that they have but they have done a great job of it. I now start to look at them as a complete store not just trailer stuff. If you want the right stuff, quality goods and, excellent service shop here. Thanks etrailer,


Follow instructions and you will have no problem installing

2012 Jeep Liberty

order called in at 3:20 one day, and received order by 5:00 pm the next day . Wow that was fast. Keep up the good work. I will use you guys every time I need anything. as a matter of fact I am working on another order as of today. Thank you all. Jerry A in NE MO.


Excellent product for the price. Installation was straight forward with no issues. Very satisfied!


On time delivery, The instructions are in very small print, but they are very easy
to understand.

2009 Jeep Liberty

Plug and play very easy

2011 Jeep Liberty

Fast & reliable


Great Product



Thank You for the follow up that means a lot about you company in how youcare, another reason why I like to deal with your company. GREATCUSTOMER SERVICE! ! ! ! Still love them all working GREAT!!!




Pretty well, but the adhesive backing for, rectifier block, Ithink its called, didnt hold too well.


Works great! Easy to install.


Very well made, so easy to install. Thank You


easy to install and looks great...


Exactly what I needed. Very fast shipping!

2011 Jeep Liberty






Show More Reviews

See what our Experts say about this Hopkins Tow Bar Wiring

  • Recommended Parts To Flat-Tow a 2012 Jeep Liberty
    In regards to flat-towing components, there are a few different brands such as Roadmaster, Blue Ox, or Demco to choose from. If you prefer one over another then that is fine but I think each excel in certain areas so I recommend mixing and matching. The Roadmaster tow bars for example have a torque multiplier system that makes disengaging the arms much easier than other options such as Blue Ox. The Demco braking systems tend to be easier to install and perform better than other options...
    view full answer...
  • Parts Needed to Flat Tow a 2012 Jeep Liberty Sport Latitude with Falcon 5250 Tow Bar
    The Roadmaster Falcon 5250 is compatible with the quick disconnects and all Roadmaster base plate kits. There are a few options for your 2012 Jeep Liberty depending on how it is equipped. If it does not have a rockguard or skid plate then use # 521433-1. If it does have a rockguard or skid plate use # 521434-1. I have included links to the instructions for the first set and a video install of the second set. In addition to the base plates and tow bar you will also need safety chains like...
    view full answer...
  • Recommended Best Parts for Flat Towing a 2012 Jeep Liberty
    For your 2012 Jeep Liberty, I recommend starting with the Roadmaster EZ Base Plate Kit - Removable Arms # 521434-1 because the system is almost invisible when not in use. It will provide a solid connection to your vehicle for the Roadmaster Sterling All Terrain Tow Bar # RM-576. This tow bar will give you the safety cables and the wiring connection you need in a really nice integrated part. For your vehicle wiring I recommend the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles...
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  • Parts Needed to Flat Tow a 2012 Jeep Liberty Behind a Motor Home
    Flat towing a vehicle requires specific equipment to tow the vehicle safely and in accordance with local, state, and federal laws. A front mount hitch is not suitable for use to flat tow a vehicle behind an RV but I can tell you all of the parts that you will need. There are at least 5 items you will need to flat tow your 2012 Jeep Liberty: base plates, tow bar, safety cables, lighting, and supplemental braking. But the first thing to check is the vehicle owners manual to make sure your...
    view full answer...
  • Can Tow Wiring Harness And 4-Way T-One Harness Both Be Installed At The Same Time
    You should have no problem installing both the Hopkins Custom Taillight Wiring Kit, part # HM56204, and the T-One Vehicle Wiring Harness, part # 118554 at the same time. It should make no difference which one is installed first, but you will want to make sure you have plenty of room behind the taillight for both harness connectors, and make sure you test the first installation with a circuit tester like part # PTW2993 before wiring the second harness. This way you will know all of the...
    view full answer...
  • How To Use Roadmaster Falcon Tow Bar On 2011 Jeep Liberty
    In order to use a Roadmaster Falcon Tow Bar on a 2011 Jeep Liberty (Without Rockguard or Skid Plate) you'll have to go with the Roadmaster EZ Base Plate Kit part # 521433-1 which requires the Quick Disconnect Crossbar Assembly part # 910021-00 if you don't already have it as that's the only option. In regards to a flat-tow wiring harness, it's hard to make a case against the Hopkins Custom Tail Light Wiring Kit part # HM56204 since it's both plug-in-play and cost effective. It also comes...
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  • Recommended Taillight Wiring Harness for Flat Towing 2012 Jeep Liberty Behind Motorhome
    The Hopkins # HM56204 is a plug-and-play wiring harness that contain diodes to prevent feedback into the tow vehicle's wiring system. The harness would use the taillights of your Liberty like a combined system. When the vehicle's being flat towed, the red taillights will act as the stop, turn and brake lamps. When the Liberty is unplugged from the RV and driven normally, the taillight system will operate as usual.
    view full answer...
  • Are Roadmaster Base Plates Compatible with a Reese Tow Bar for a 2012 Jeep Liberty
    The Roadmaster base plates, # 521434-1, will work with a Reese tow bar as long as it is Reese model 74950 and you use adapter # RM-025 with quick disconnects # RM-201. If it is a different model tow bar then it will not work. based on my research I found that the compatible Reese tow bar is only rated for 5,000 pounds so it is not likely the base plates will be compatible. For a compatible tow bar you can use the Tracker # RM-020 and you will also need the quick disconnects # RM-201. You...
    view full answer...
  • Tow Bar Wiring Recommendation for a 2007 Jeep Liberty
    For your 2007 Jeep Liberty the tow bar wiring harness is the # HM56203, the # HM56204 is for the newer generation Liberty that starts in 2008. To determine if you would also need the brake light relay part # RM-88400 (price at link below) you will need to 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...
    view full answer...
  • Recommended Flat Towing Parts for a 2012 Jeep Liberty
    You will need to purchase the parts separately there isn't one giant flat towing kit that can be purchased. There are just way too many options and combinations. We all tend to recommend different products so my choice in parts will be different but not necessarily better. The question you looked at is a few years old but they stopped making new parts for 2012 Liberty's awhile ago. To flat tow your 2012 Jeep Liberty you will need the following parts: Tow Bar and Safety Chains - etrailer...
    view full answer...
  • Parts Recommendations For Flat Towing 2012 Jeep Liberty Sport Behind A Motorhome
    You will want to check with your local DOT to make sure you can tow a vehicle with a scooter carrier and scooter attached to the rear of your 2012 Jeep Liberty Sport. I recommend the Blue Ox Base Plates, part # BX1131. This bolts to the chassis and requires no welding for installation. The tabs are easily removed for a more inconspicuous look, and includes all the necessary hardware for installation. I have attached an installation video for these base plates on a 2012 Liberty you can...
    view full answer...
  • Recommended Custom Tail Light Wiring Kit for Flat Towing 2011 Jeep Liberty
    The Hopkins Custom Tail Light Wiring Kit for Towed Vehicles # HM56204 is a confirmed fit for your 2011 Jeep Liberty. It has integrated diodes to prevent feedback for safe operation and plugs right in to your victory wiring and the tail lights of your vehicle. Your vehicle does not require a battery disconnect kit.
    view full answer...
  • Toad Vehicle Wiring Kit For A 2020 Ford Ranger
    The Hopkins Custom Tail Light Wiring Kit for Towed Vehicles # HM56204 will unfortunately not work for your 2020 Ford Ranger. However, the Roadmaster Diode 7-Wire to 4-Wire Flexo-Coil Wiring Kit # RM-15247 is confirmed to work with your vehicle. This kit includes 4 Hy-Power diodes; 30' long 4-wire harness; wire connectors; cable ties; 1 ring terminal; 3' long plastic loom, 8 ft coiled cord, vehicle mounting bracket, and a socket.
    view full answer...
  • Recommended Base Plates for 2012 Jeep Liberty to Use with Roadmaster Sterling Tow Bar
    If your 2012 Jeep Liberty doesn't have a rockguard or skid plate then I recommend the Roadmaster EZ Base Plate Kit # 521433-1. If you do have a rockguard or skid plate then you will want the Roadmaster EZ Base Plate Kit # 521434-1, which will actually replace the rockguard/skid plate. Both of these options are directly compatible with your existing Sterling Tow Bar. Your current Roadmaster InvisiBrake # RM-8700 will also work great with your Jeep Liberty. If you are using a lighting solution...
    view full answer...
  • How to Flat Tow a Second Generation Jeep Liberty 2008-2011
    In order to flat-tow a second generation (2008-2011) Jeep Liberty with all four wheels on the ground you will need a base plate kit, tow bar, flat-tow wiring harness, safety cables, supplemental braking system, and possibly a high-low adapter. I have attached my recommendations for each of these parts below. For a base plate kit I recommend the Roadmaster Base Plate Kit part # 521434-1 if you have a have rock guard or skid plate excluding Renegade, part # 521433-1 if you do NOT have a...
    view full answer...
  • How To Use Roadmaster Tow Bar On 2010 Jeep Liberty
    In order to use a Roadmaster Tow Bar On a 2010 Jeep Liberty like the Falcon 2 Tow Bar part # RM-520 you'll need the Roadmaster EZ Base Plate Kit part # 521433-1. In regards to the wiring, I recommend the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles part # HM56204.
    view full answer...
  • Preparing 2008 Jeep Liberty To Be Flat Towed Behind A Motorhome With Blue Ox Bars And Air Force One
    First you will need the Blue Ox Base Plate Kit # BX1976 to connect your 2008 Jeep Liberty to your motorhome. This will fit the Blue Ox Adventurer, Aladdin, Allure, Alpha, Avail, Aventa, and Trion tow bars. If you have a different model tow bar let me know and I will help find an adapter or replacement. The Hopkins Custom Tail Light Wiring Kit # HM56204 will plug directly into the taillights on your Liberty. This can connect directly to the motorhome via the 4-way connector that is on...
    view full answer...
  • Roadmaster Base Plates for a 2012 Jeep Liberty and BlackHawk Tow Bar
    Yes, you can use either # 521433-1 (if the Liberty does not have a rockguard or skid plate) or # 521434-1 (if it does have a rockguard or skidplate). Either set is compatible with your BlackHawk tow bar. You will also need safety cables like # RM-643. Next you will need a lighting solution. I recommend the plug and play Hopkins harness # HM56204 for the easiest installation. You will also need a supplemental braking system on the Jeep as required by law in most states. The easiest to...
    view full answer...
  • Can a 2010 Jeep Liberty Renegade Be Flat-Towed
    The 2010 Jeep Liberty could have came in either a four wheel drive or two wheel drive configuration. The four wheel drive models can be flat towed with all four wheels down whereas the two wheel drive models cannot. If you have a Renegade then you have four wheel drive so it can be flat-towed. If you take a look at page 406 of your owner's manual, this is explained for you. In order to flat tow the vehicle you are going to need a tow bar, base plate kit, safety cables, tail light wiring...
    view full answer...
  • Flat Tow a 2009 Jeep Liberty, What is Needed
    Yes it is and we can help you put together a complete package to flat-tow your 2009 Jeep Liberty. Please note the link to help article that I have attached with information listed below. You will need: - Base plate kit - Tow bar - Flat-tow wiring harness - Safety cables - Supplemental braking system - *Possibly a high-low adapter. Please links for each item below: Base plate kit, I suggest the Roadmaster Base Plate Kit # 521434-1. This is a confirmed fit for your 2009 Jeep Liberty....
    view full answer...
  • Can Tow Bar Wiring Harness be Bypassed on a 2012 Jeep Liberty
    Do you want to bypass the converter because the RV uses separate turn signals and brakes lights like the 2012 Jeep Liberty or for some other purpose? The converter box in a tow bar wiring harness such as # HM56204 takes the separate turn signals and brake lights used by the Jeep and combines them. It also offers circuit protection so bypassing it would not be a good idea. If you want the Jeep turn signals and brake lights to be separate you would need to use the 6 diode kit # 154-792-118158.
    view full answer...

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Notes: May have damaged packaging or minor cosmetic blemishes.

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