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Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles

Item # HM56100

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Tow Bar Wiring

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Hopkins Plugs into Vehicle Wiring - HM56100
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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. Lowest Prices for the best tow bar wiring from Hopkins. Hopkins Custom Tail Light Wiring Kit for Towed Vehicles part number HM56100 can be ordered online at or call 800-298-8924 for expert service.

  • All Info
  • Reviews (14)
  • Q & A (14)
  • Videos (2)
  • Photos
  • Why etrailer?

Hopkins Tow Bar Wiring - HM56100

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.


  • Lets you wire your vehicle to accept your RV's tail, brake, and turn signal lights for flat towing
    • 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.

Do You Need a Brake Light Relay?

Because your vehicle has a combined lighting system - wherein the brake signals and the turn signals are carried on a single wire - 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.

11156100 Hopkins Plug-In Simple Dinghy Towing Harness

Replaces 56100

This Product Fits The Following Vehicles

2006 - 2006 Pontiac G5 Pursuit

2006 - 2010 Chevrolet HHR

2005 - 2010 Chevrolet Cobalt Coupe

2007 - 2010 Pontiac G5 Coupe

2005 - 2006 Pontiac Pursuit Coupe

California residents: click here

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 - HM56100 Review

Today we're going to review part number HM56100. This is the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles. This is a custom fit part, it is designed to fit the 2005 to 2010 Chevrolet Cobalt and HHR, the Pontiac Pursuit, the G5 and the G5 Pursuit, all of those vehicles. Now, on any custom fit product, what I always recommend is to go to our website. Use our fit guide, put in your year and model of vehicle and it'll show you if this will work for your application. Now, this part will let you wire your vehicle to accept your RV's tail break and turn signals for flat towing.

It provides this 4-way flat plug at front of towed car to connect to your motor home. It does plug in quickly and easily, there's no cutting or splicing of wires. Basically, just use these t-connectors right here, locate your connection points which are usually located behind your vehicle's tail lights. Plug them in, mount your ground wire, and you'd be all ready to go. Now this does prevents electrical feedback to safeguard your towed car's electrical system. This box right here is a weatherproof box that helps keeps the built-in diodes protected.

Now this won't interfere with your electrical system when the towed car is not hooked up to the RV. Again, it is custom designed for your vehicle. It includes everything showing here on the table. Basically, when you go to install this, what you'll do is go to the back of the vehicle and access behind the tail lights. You'll start of on the driver's side and you'll take this t-connector here with the yellow wire in it.

This will attach to the unplug the wiring harness on the tail light on the driver side, plug this in on that way. Then this t-connector with the length of wire, with the green wiring, that's for the passenger side. You'll run this over to the passenger side. Then again, disconnect the harness from the tail light, plug this t does into it, and you have that all connected in the back. Now, what they do recommend on this converter, you can see there's slots right here. They do recommend to mount this so it doesn't move around.

You don't want that bouncing around. You do want to mount that to keep it from moving. Then you'll have this 4-way, with this long length of wire in a white wire on it, this you need to run from the back of the vehicle all the way to the front. You're going to mount this 4-way at the front, to make it to be able to plug in to the RV that you're hooking your towed vehicle up to. Now, there is an extension loop that you probably need to use for connecting the towed car to the RV, we do sell those separately. They are listed on this product pages, related products. One other thing, also a break light relay might be required if you use this with a supplemental breaking system. You need to look on your vehicle's owner manual to see, but if you do use a supplemental breaking system, sometimes a break light relay is required. Again, we do sell those separately, they are listed on this product page as a related product. It's part number RM-88400. Once it's all connected in that back, run this to the front, they'd give you some cable ties to take up any slack in the wiring. Once you get to the front of the vehicle and you run this out the front, this white wire has an eyelet on it. You do want to connect this to a good ground. It gives you a grounding screw that you can drill a hole and connect the good ground. Then you'll notice it comes with a nice dust cap, that when you're not plugged in to your RV, it'll keep your terminals protected from any damage or from the elements themselves. The other nice thing is they do include, you can see this mounting bracket that you can mount with the mounting screws. What this will do is you can put your 4-way in this just like that on your dust cap out the side. Push that together, now you can see you can use this mounting screws to mount this to the front. Then just put your dust cap over that just like that. The last thing they include is this package of dielectric grease and that's good to use on any of your terminals or electrical connections to keep any rust or corrosion from forming on those terminals. That should do it for the review on part number HM56100. This is the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles.

Customer Reviews

Hopkins Custom Tail Light Wiring Kit for Towed Vehicles - HM56100

Average Customer Rating:  4.4 out of 5 stars   (14 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.

- HM56100

Harness did not work on the driver's side. The good news is Etrailer customer support is shipping me a replacement. Sometimes things don't work, but a good customer service overtakes that. 327984

- HM56100

It works great 638823

- HM56100
2008 Chevrolet HHR

The wiring kit was very easy to install and the instructions were very helpful. Works just like it should. 608072

- HM56100

Thank you. 575685

- HM56100

Everything as ordered would buy again 547152

- HM56100
2007 Chevrolet HHR

Product was wadded up in a small box with no instructions. Looked used. The last one I purchased was in a nice blister pack. If I Hadn't already done an install on my friends HHR I would have needed the instructions. I'm sure this was a fluke. I've never had a problem with their products in the past and I will purchase again. It works just as it should. 375074


Thanks for leaving a review Captain Ron. This should have come to you in a blister pack. I apologize for the mistake and suggest that if this ever happens again that you call customer service and they will resolve this problem.

Hopkins C from - 05/03/2017


- HM56100
2008 Chevrolet HHR

had good experience with the wiring kit. everything connected perfectly and worked as designed. good product. 371857


Thanks for taking the time to write a review and rate the HM56100 wiring kit, Wilson !!! We are pleased that it met your wiring needs.

Hopkins C from - 04/26/2017


- HM56100
2007 Chevrolet HHR

Tow wire kit HM56100 was a direct fit for my 2007 Chevy HHR which will be flat towed behind my motor home. Shipment was delivered on time. etrailer is a great company to do business with. 359378

- HM56100

Fantastic unit. Easy to install and makes for a professional look. 317672

- HM56100
2007 Chevrolet HHR

Quick shipping and communications. Easy to install 284841

- HM56100

I was very happy to see the wiring kit on webpage. It couldn't be any simpler to place my order and then have it in my hand in 2 1/2 days. Installation could not have been any easier with the direction that came with the kit. I have to say etrailer ranks in my top companies to buy from on the internet. Thanks etrailer. 254046


I have not had any problems with the product. I love things that work as it should.

Robert S - 05/30/2017


- HM56100
2006 Chevrolet HHR

received harness on Tuesday the 4th, installed it on Wed. took about an hour. hardest part is running wires to front of car., but that part would be difficult with any product.. 216892

- HM56100
2007 Chevy HHR

the product i bought kooks great I have the wiring set up for a 2007 hhrI received the package wensday 5/15/15 . it took 3 hrs to put every thing to gather , your inst. was a great help. thanks i will with out a doubt use your co more. robert rasmussen sorry no pics. 212015


Does your license plate lights work?

-- comment by: Phil - 02/15/2016


- HM56100
2007 Chevrolet Cobalt

Easy to hook up and install the wiring. Ran mine inside the car behind the molding on the floor below the door and through the firewall. 168363


Ask the Experts about this Hopkins Tow Bar Wiring
Do you have a question about this Tow Bar Wiring?

  • How To Flat-Tow a Chevrolet HHR SS
  • Yes, the Chevrolet HHR SS is flat-towable with all four wheels down. In order to do so 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 options the vehicle is equipped with. For a tow bar, I recommend the Roadmaster Falcon 2 Tow Bar part # RM-520. The Falcon is one very nice tow bar. It has a non-binding...
    view full answer...

  • Compatibility of Hopkins Towing Wiring Harness HM56100 with Brake Buddy Braking System
  • The built-on diodes on your Hopkins # HM56100 will work just fine. We've found that this harness isn't compatible with some braking systems, but your Brake Buddy is of the type that is compatible. Everything will work together well. I'll link you to some FAQ articles that I hope you'll find helpful.
    view full answer...

  • Parts Needed to Flat Tow a 2009 Chevy HHR Behind a Motor Home
  • This has actually come up before and Roadmaster explained that they have not tested their base plates with the EAZ Lift tow bars so I cannot say if they will fit or not. You would need to contact EAZ Lift to determine if they have tested it with Roadmaster or Blue Ox base plates. What I recommend is using the Roadmaster base plates, # 3141-1, and using a tow bar that you know is compatible like the Falcon 2, # RM-520. You will also need safety cables like # RM-643. Next you will need...
    view full answer...

  • How to Use the Lights of My 2006 Chevrolet HHR on a Tow Dolly Behind an RV
  • It sounds like you want to use the lights on your 2006 Chevrolet HHR instead of the lights on your tow dolly when towing your vehicle. If this is the case, you will need the Hopkins Tail Light Custom Wiring Kit # HM56100. This will allow you to connect the HHR directly to your motorhome and power the lights instead of the dolly. The Curt T-Connector Wiring Harness # C55432 you asked about is what you would use if you were towing a trailer with the HHR. I've attached a video showing...
    view full answer...

  • How to Flat Tow a 2007 Chevy HHR Behind a Motor Home with a Blue Ox Aventa Tow Bar
  • Yes, the Aventa tow bar is compatible with the Blue Ox base plates # BX1692 on your Chevy HHR. In addition to the tow bar and base plates, you will need safety cables, # BX88196, if you do not already have some. For lighting you can use a simple magnetic kit such as # C-ATL20A. Or you can use a kit that plugs in line with the vehicle tail light wiring, # HM56100. It looks like you will need to pull fuses to flat tow your HHR. Check the owners manual to confirm. To make this process...
    view full answer...

  • Parts Needed to Flat Tow a 2007 Chevy HHR Behind a Motor Home
  • I looked up an online version of the owners manual for a 2007 Chevy HHR and found that it can be flat towed. It gives the following steps: First set the parking brake. Then turn the ignition key to ACC to unlock the steering wheel. Next shift into neutral. Then release the parking brake. You also have to pull fuse 8 from the floor console fuse block to prevent draining the battery. The manual also states to not exceed 65 miles per hour. Any time you ever have a flat towing question, you...
    view full answer...

  • How Does the Hopkins Custom Tail Light Wiring Kit # HM56100 Install on a Vehicle
  • To answer your question simply, yes. The Hopkins Custom Tail Light Wiring Kit # HM56100 plugs in line with the taillight wiring harness of your 2007 Chevy Cobalt. You will unplug your taillight harness on your vehicle and then plug it into the corresponding connector of the # HM56100. The other connector of the # HM56100 will then plug into the connector for the vehicle's wiring and the install will be complete. When you are flat towing this vehicle you will plug the 4-way of this...
    view full answer...

  • Recommended Parts for Flat Dinghy/Recreational Towing a 2008-2010 Chevy HHR
  • To flat tow your 2008-2010 Chevy HHR you will need a base plate kit, tow bar, safety cables, vehicle tow bar wiring, a supplemental braking system, and most likely a high-low adapter. For base plates I recommend going with either Roadmaster part # 3141-1 for a Standard model or part # 523159-1 if you have an SS model. The tow bar I recommend for either of these kits is the Roadmaster Sterling All Terrain # RM-576. This is rated for 8,000 lbs and comes with safety cables that are rated...
    view full answer...

  • Parts Needed to Flat Tow 2007 Chevy HHR
  • We have everything you need to flat tow your 2007 Chevy HHR. The first thing you'll need is a base plate kit. This is what provides the connection point for the tow bar to the vehicle frame. For that we have the Roadmaster kit part # 3141-1 which is a confirmed fit. Next you'll need a tow bar. For that we have the Roadmaster Sterling # RM-576 which is very easy to use and comes with safety cables and wiring to go from the rear of the tow vehicle to the front of your HHR. For a tow bar cover...
    view full answer...

  • Plug-In Tow Bar Wiring for a 2007 Chevy HHR
  • The connectors that plug into the tail light wiring in Hopkins tow bar wiring kit # HM56100 for the 2007 Chevy HHR are not available by themselves. You would need the whole kit. Consult your owners manual because it also looks like you will need to pull a fuse to flat tow your HHR. To make this process as easy as flipping a switch you can use fuse bypass # RM76511.
    view full answer...

  • Base Plate Kit and Flat Towing Accessories for 2006 Cheverolet HHR
  • An HHR LS and LT use the same base plate kit. As long as the HHR is NOT an SS model, the Roadmaster # 3141-1 base plate kit you referenced would work just find for you. To flat tow your vehicle, you'll also need to check with your owner's manual and determine if your HHR is capable of being flat towed. To complete your towing system, you'll need a towbar, safety cables, wiring, and a supplemental braking system. For a towbar, the Roadmaster Falcon 2, part # RM-520 would be a great...
    view full answer...

  • Tail Light Wiring Kit to Tow a 2007 Chevrolet HHR Behind a Class A Coach
  • The Roadmaster Universal Hy-Power Diode Wiring Kit, # RM-154, will work with your 2007 Chevrolet HHR. I have attached an installation video of this kit on a 2011 HHR for you to check out. If you do not want to cut your vehicles tail light wiring, then you may be interested in the Hopkins Custom Tail Light Wiring Kit for Towed Vehicles, # HM56100. I prefer this wiring harness because it has a simple plug-in installation. I have attached a few help articles on tow bar wiring for you to...
    view full answer...

  • Running Lights on 2005 Toyota Avalon Not Working After Installing Trailer Wiring Harness # HM56100
  • The wiring harness that you referenced, Hopkins # HM56100, is not intended for use with a trailer. This harness is designed to operate the 2005 Toyota Avalon lights in flat-towing applications when using a tow bar behind a motor home. The correct trailer wiring harness for your car is Curt # C59236 which is a hard-wired installation that provides a flat-4-pole trailer connector to power your trailer lights. Written installation instructions as well as a video are linked at right.
    view full answer...

  • Recommended Flat Towing System Parts for 2007 Chevy HHR
  • To flat tow your 2007 Chevy HHR there are a few components you will need that all work together to give you a safe towing experience. I recommend starting with the Roadmaster XL Base Plate Kit - Removable Arms # 3141-1 and using Loctite Threadlocker # LT37420 to secure the hardware when installing. Then for your tow bar I recommend the Roadmaster Sterling All Terrain, Non-Binding Tow Bar # RM-576 which has integrated safety cables and a wiring connector to connect your motorhome to...
    view full answer...

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Info for this part was:

Edited by:
Leah B
Written by:
Lindsey S
Expert Research:
Michael H
Installed by:
Jeff D
Photos by:
Jim W
Updated by:
Sarah W
Updated by:
Alexander C

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