1. Tow Bar Wiring
  2. Roadmaster
  3. Removable Tail Light Kit
  4. Bypasses Vehicle Wiring
  5. Universal
  6. Magnetic Mount
Roadmaster Standard Magnetic Tow Lights

Roadmaster Standard Magnetic Tow Lights

Item # RM-2120
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Tow Bar Wiring

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RM-2120 - Magnetic Mount Roadmaster Tow Bar Wiring
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Avoid tapping into your towed vehicle's electrical system by using these self-contained tow lights. Heavy-duty magnets keep lights securely in place on your towed car. Lowest Prices for the best tow bar wiring from Roadmaster. Roadmaster Standard Magnetic Tow Lights part number RM-2120 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (15)
  • Q & A (820)
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Roadmaster Tow Bar Wiring - RM-2120

  • Removable Tail Light Kit
  • Bypasses Vehicle Wiring
  • Universal
  • Magnetic Mount
  • Roadmaster
  • 20 Foot Long Harness

Avoid tapping into your towed vehicle's electrical system by using these self-contained tow lights. Heavy-duty magnets keep lights securely in place on your towed car.


  • Allows you to legally tow your car without having to tap into its wiring
  • Eliminates risk of electrical damage to towed car
  • Attaches securely with magnets
  • Connects directly to motor home wiring, bypassing towed vehicle completely
  • Has heavy-duty vinyl casing for superior protection of wiring
  • Meets Department of Transportation standards
  • Fits all vehicles
  • Includes 2 lights and wiring harness with 4-pole flat trailer connector
  • Length of wire:
    • Wire that connects the lights: 53-1/2"
    • Wire that extends out the back of the light: 243"
    • Wire with 4-pole connector: 35-1/2"
  • Limited Lifetime Warranty

The law requires that all towed cars have functional signal and brake lights in sync with the RV towing them. Most wiring kits require you to splice into your vehicle's electrical system, but doing this can void your manufacturer's warranty. Magnetic tow lights avoid this problem by having the wiring run underneath your car and plug into your power source.

2120 RoadMaster Standard Magnetic Tow Lights

This Product Fits The Following Vehicles

Customer Reviews

Roadmaster Standard Magnetic Tow Lights - RM-2120

Average Customer Rating:  4.7 out of 5 stars   (15 Customer Reviews)

Avoid tapping into your towed vehicle's electrical system by using these self-contained tow lights. Heavy-duty magnets keep lights securely in place on your towed car.

- RM-2120
2005 Subaru Forester

I like these lights, nice strong magets hold them securely to car roof. I use them because my bikes in bags cover my tail lights. I added LED bulbs because when I tow the car with my RV these additional lights put to much load causing voltage drop and dim lights.

These lights are still working well only improvement I could suggest is if they could somehow maybe put up plastic layer between the magnets and the roof because they’re taking paint off, if they could still make the magnet is strong.
Jay C - 08/03/2018

- RM-2120
2011 Mazda MX-5 Miata

Very strong magnets and plenty of length on the cord for a car in tow.

- RM-2120
Jeep Wrangler

I purchased the Curt Tow Bar with Adjustable-Width Arms - Car Mount - 2" Ball - 5,000 lbs. initially I was Leary of the product because of its low price compared to other tow bars. I now can say my concerns were needless because after flat towing my Wrangler over 5,000 trouble-free miles I have nothing negative but only positives to report. The best thing I like about the tow At is that it only takes 5 minutes to attach and unhook.

- RM-2120
2010 Mini Cooper

Everything delivered even faster than expected - Thank you.

- RM-2120

Very simple product. Exactly what I wanted. I need to do something more permanent but this worked for our trip. The most important thing was I needed it fast and I got it in time. Friendly and informative people on the phone were knowledgeable and new their product. I will shop here again.

- RM-2120
2010 Chevrolet Silverado

Everything was delivered on time and worked perfectly. This solved my concerns about towing my car with my RV with a car dolly.

- RM-2120

Fast delivery. Did a test as soon as I received the light kit. Flawless. Magnets very strong but safe for car finish.

- RM-2120

I did a mock-up set-up and this kit works as advertised. Magnetic bases are strong, it should fit my needs perfectly.

- RM-2120

These are the products that we needed and you were able to provide them.

- RM-2120


- RM-2120

lights look fine.... easy hitch is far better than I expected....very nice. I should have gotten this sooner!!!

- RM-2120
2015 Mercedes-Benz Sprinter

works great, easy application

- RM-2120

- RM-2120

- RM-2120

- RM-2120
2018 Jayco Greyhawk Motorhome

Just what I wanted


Ask the Experts about this Roadmaster Tow Bar Wiring

  • Replacement Lens for my Magnetic Towing Lights
    We offer replacement lenses for the part # RM-2120 in the red color using the Replacement Tail Light Lens Red part # A52RB. These are red lenses and to get the black out look you will have to paint it. I do not offer a blacked out version. Double check the diameter of your light to ensure this does in fact match yours. The outside diameter of the lens should be 4 5/16" for this to work out. If you have something different let me know.
    view full answer...
  • Wiring Magnetic Tow Lights to a 6-way Round Connector on a RV
    It sounds to me like your 6-Way connector has been wired for some alternate wiring situation, and that is most likely why the adapter does not work properly with the Magnetic lights. I would use a circuit tester, item # 40376 if you need one, and check all of the functions in the 6-Way connector on the RV. Draw a diagram and label each circuit. You will need the stop, turn/brake, tail and ground functions out of the 6-way connector to operate the functions on the 4-way connection of the...
    view full answer...
  • Can the Roadmaster Invisibrake be Used with Magnetic Lights on a 1997 Jeep Wrangler
    You can use the Invisibrake, # RM-8700, with a magnetic lighting system by splicing into the 4 wires on the magnetic lighting system. The only difference from the instructions is that the magnetic light ground has to grounded to the Jeep chassis rather than through the 4-Way connector. The brake switch is located above the brake pedal. On a 1997 Jeep Wrangler the wire you need on the brake switch is a white/tan wire. The easiest way to get to it is the direct approach. You may have to...
    view full answer...
  • Flat Towing Wiring Harness Options for 2012 Fiat 500
    There are two ways you could wire your Fiat 500 for flat towing. In scenario # 1, you could use a 4 diode kit like # RM-15247 which would use your tail lights as stop/turn/brake lamps. Your lights would work normally when actually driving the Fiat, but when you're flat towing, you'd only use the red bulb on the back of the Fiat for all the taillight functions. Scenario # 2, if you wanted the taillights on the Fiat to operate 'normally', that is to have the turn signals use the amber...
    view full answer...
  • Recommended Tow Bar Lighting For 1984 Jeep CJ-7
    If you are not planning on towing your Jeep really often I recommend using magnetic lighting like the RoadMaster Standard Magnetic Tow Lights part # RM-2120. Using the magnetic lights may be a better option because you would not have to work with the older wiring on your CJ-7. I called my contact at Blue Ox and they told me that you can use the Blue Ox Tail Light Wiring Kit, part # BX8811, although we do not have any information about this kit and installation on a your Jeep. When...
    view full answer...
  • What Type of 4-Way Connector is Attached to the RoadMaster Standard Magnetic Tow Light # RM-2120
    The 4-way that attaches to the RoadMaster Standard Magnetic Tow Lights # RM-2120 is a female connector. It also comes with an extension piece that has a male end as well that does have a protective cover.
    view full answer...
  • Can A Magnetic Light Kit be Used at the Same Time as a Tow Dolly Light Kit
    As long as the power draw from the lights on the tow dolly and the magnetic lights does not exceed the amperage rating of the tow package wiring on the RV then you can just tap the magnetic kit into the tow dolly wiring harness. What I recommend is to tap into the tow bar wiring using the short wiring harness in # RM-2120 that you referenced. That way when it is not needed you can just put the cap on it and secure it to the tow dolly or RV. But you must make sure that the combined power...
    view full answer...
  • Magnetic Tow Lights With Protection For Vehicle Finish
    There are a couple of magnetic tow lights that have specifically stated the anti-scratch elements of their magnets. The Roadmaster Standard Magnetic Tow Lights # RM-2120 have anti-scratch pads to protect your vehicle's finish and the Blazer Magnetic Tow Lights - Red LEDs - 4-Way Flat Connector - Wireless # C6304 have what they call non-scratch magnets. I've attached some video reviews of these products for you. With all of our magnetic lights, the magnets are strong enough that you...
    view full answer...
  • Light and Wiring Recommendations for Flat Towing a 2008 Chevrolet Avalanche
    Because the Chevrolet Avalanche vehicles have so much body trim that is plastic, like on the top of the rear bumper and the top of the bedsides, you would need to use the Standard Magnetic Tow Lights, # RM-2120, on the sides of the vehicle near the rear taillights. I believe a better option for your truck is the Hopkins Tow Bar Wiring for the 2008 Avalanche, # HM56103, which will let you connect your RV signal lights to the Avalanche lighting system. This wiring harness plugs inline...
    view full answer...
  • Adapter for a 7-Way Connector on a 2010 Toyota Tacoma and a 4-Way on Magnetic Wiring Harness
    It sounds like the magnetic kit you have uses a 4-Way flat connector and the truck has a 7-Way blade style connector. There is an adapter you can use. Several as a matter of fact. I have included a link to them for you to view. A simple option like # PK12716 is all you would need. But since you are flat towing, you may need some extra slack so going with a coiled adapter like # HM47065 may be the best way to go.
    view full answer...
  • Magnetic Flat Towing Light Recommendation that are LED and have 4-Way Flat Connector
    The bulbs of the Roadmaster Standard Magnetic Tow Lights # RM-2120 are incandescent, they are not LED. A better option would be the MaxxTow Magnetic Tow Lights # MT70097. This kit uses LEDs and comes with a 4-way flat already. I attached a review video for you to check out as well.
    view full answer...
  • Recommended Wiring Solution for Flat Towing 2020 Jeep Wrangler Unlimited
    There is an available EZ mount lamp system that you could close in the tailgate of your Wrangler Unlimited, part # EZT20B. This is basically the same setup as a magnetic mount, without the magnets. This is the kind of system that many folks start out with, because they like the simplicity of operation and how easy it is to install. However, many find they don't like the cords flapping in the wind or the time it takes to thread the wiring through the interior of the vehicle each time they...
    view full answer...
  • Can I Replace the Four Way Flat Connector on My Roadmaster Magnetic Tow Lights, # RM-2120
    Yes, you can re-wire the Roadmaster Standard Magnetic Tow Lights, part # RM-2120, to a different connector so it will connect to your motorhome. Most likely the 4 wires will be the standard colors and will wire up color to color. These colors are: Green, Right turn Yellow, Left turn White, Ground Brown, Tail/Marker Typically, the connector is wired in this way: The green wire will be on the top left, the yellow wire will be on the top right, the brown will be on the bottom left,...
    view full answer...
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  • Compatiblility Using A 7-way Trailer Connection For Tow Lights And A 4-Way For Trailer Dolly Lights
    To install the Roadmaster Standard Magnetic Tow Lights # RM-2120 you will need the Hopkins Endurance Multi-Tow Twist-Mount 7-Way RV and 4-Way Flat Trailer Connector - Vehicle End # HM40920 for your RV Connection. If you don't have the right connection when swapping your 7-way on your RV, then you will need the 4' Pigtail Wiring Harness for Pollak Replacement 7-Pole RV Socket # PK11998.
    view full answer...
  • Compatibility of Roadmaster # RM-2120 Magnetic Tow Lights with 2011 Cadillac SRX
    When the # RM-2120 lamps are installed on your vehicle, they will operate completely independently of the lights on the towed vehicle. As long as your RV has a properly installed 4-way trailer connector for the magnetic lamps to plug into, all should work just fine. You mentioned that the RV has a 'separate' lighting system, which would use an amber turn signal bulb or have an amber turn signal lens. A properly installed 4-way will be already converted so the turn signal and brake lamp...
    view full answer...
  • Tow Bar Lighting Recommendation for a 2015 Jeep Wangler Rubicon
    For a lighting kit you can use the Roadmaster # RM-2120 kit. For a more permanent solution I would recommend the # HM56200. I attached an install video for you to check out as well. I also attached an FAQ on picking out the best tow bar lighting solution for an application.
    view full answer...
  • 4-Way Recommendation for Roadmaster Magnetic Tow Lights part # RM-2120 for Connect to Tow Vehicle
    The Roadmaster Magnetic Tow Lights part # RM-2120 that you referenced will work for you, but you will need to also purchase and wire a 4-way like part # W787264 to the blunt cut wires of the # RM-2120. The 4-way you described on the # RM-2120 plugs in to the 4-way of the light assemblies, and then the wire of that 4-way is left without a connector so that you can wire it up to match the connector of your tow vehicle. In your case you would just need to wire up the # W787264 to it and...
    view full answer...
  • Can Magnetic Light Kit # RM-2120 Wiring Be Attached Directly to the 7-Way Connector of a Tow Dolly
    You could potentially install the magnetic light kit # RM-2120 in the manner you have described. However, you would need to make sure the magnetic lights wiring is connected on the tow dolly side connector for easy installation and removal. Adding more wires to the 7-Way can increase the chances of a short circuit and there may not even be room depending on the gauge of wire used on the tow dolly. If there is no room or it looks like the wires for adjacent circuits could touch, I recommend...
    view full answer...
  • How To Install Trailer Lights On A Trailer Without Tail Lights
    The Roadmaster Deluxe Magnetic Tow Lights part # RM-2120 you are referring to are designed to be placed on the rear of the vehicle in a flat tow situation. If you are wanting to tow a trailer with your 2017 Hyundai Tucson, then you will want the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118501 as this will allow you to hook up your vehicle's tail lights to your trailer tail lights while towing. It is also a plug and play connection therefore you will not need...
    view full answer...
  • Recommended 4-Way Trailer Wiring Bracket for 2018 Toyota Tacoma
    It sounds like you are seeking a mount for your 4 way. I recommend the bracket # 18144. This can connect to the back of a vehicle, a trailer hitch using # 18140, or the front of a towed vehicle.
    view full answer...
  • Recommended Supplemental Braking System For Use With Multiple Tow Vehicles
    The best supplemental braking system for your situation is the Blue Ox Patriot 3 part # BRK2019 which is a portable braking system. The Patriot sits in the floor board of the 2007 Honda Fit and depresses the brake pedal when the motor home stops. It is compatible with power assist brakes so if you decide to switch to a hybrid tow vehicle in the future the Patriot will be compatible. However, I have checked the owner's manual for the 2007 Honda Fit and it looks like Honda does not recommend...
    view full answer...
  • Comparing Direct-Connect and Crossbar Base Plates for 2018 Jeep Wrangler JL Unlimited
    The difference between the Roadmaster Direct-Connect Base Plate Kit # RM-521453-5 and Roadmaster Crossbar-Style Base Plate Kit # RM-521453-4 is how tow bars attach. As the name suggests, you will connect your tow bar straight to the direct-connect base plates while the crossbar style will require you use your tow bar's crossbar or quick-disconnect. This makes the direct-connect the easiest base plate to connect to and disconnect from. Because of that, for your 2018 Jeep JL Wrangler Unlimited...
    view full answer...
    Image 1 for
  • Connecting Magnetic Tow Bar Lights With 4-Way to Motorhome With 7-Way
    We have some options for you to connect magnetic tow bar lights to a motorhome connector (which should be a standard RV 7-way), though there isn't an adapter to go from the 4-round on the Heavy Duty Magnetic Tow Light Set # 337TL257M. While you could do some cutting and splicing to get it to work, the much easier option is to go with a magnetic light set with a 4-flat, the Roadmaster Standard Magnetic Tow Lights # RM-2120. There is an adapter that will go from a 4-flat to a 7-way,...
    view full answer...
  • Parts Needed to Flat Tow 2017 Chevy Spark with Manual Transmission and Roadmaster StowMaster Tow Bar
    In order to use the Roadmaster StowMaster # RM-501 you'll want to use the Roadmaster Crossbar-Style Base Plate Kit - Removable Arms # RM-523185-4 as your compatible base plates since the EZ4 model plates are compatible with the StowMaster. For safety cables you can use the Roadmaster # RM-643, which are a nice, coiled cable to keep them from getting damaged from dragging on the ground. For tow bar wiring I recommend using a magnetic light set like the # RM-2120 because it offers the...
    view full answer...
  • Tow Bar Light that Can Fit Mini Cooper 2012 Convertible S that Bypasses Vehicle Wiring
    It doesn't look like there is a flat metal surface that the # LIW-LDTL-7B could attach to at the rear of your 2012 Mini Cooper convertible so a different light kit like the # RM-2120 would be a much better option with the TLP01 helpers would probably work for you..
    view full answer...
  • Is the E-Z Mount Tow Light Kit EZT20B Still Available
    The E-Z Mount Tow Light Kit part EZT20B has been discontinued by the manufacturer and replaced with the magnetic base style, the Magnetic Towing Light Kit part # RM-2120. I did check all of our other options but none retain this same style of mounting. The list is attached below as well.
    view full answer...
  • Base Plates, Tow Bar, Wiring, Safety Cables, Braking System to Flat Tow a 2010 Honda Civic 4 Door
    There are actually a few items you will need to safely flat tow your 2010 Honda Civic 4 Door. If your Civic is a DX, EX, or LX, you will need Roadmaster EZ Base Plates, # 521557-1. You will then need a compatible tow bar like RoadMaster Tracker Tow Bar, # RM-020 with Quick Disconnects # RM-201. I have included a link to the installation details for the tow bar for reference. To complete the towing set up for your Civic, you will need safety cables, lighting, and a supplemental braking...
    view full answer...
  • Recommendation on Wiring a 2015 Ford F-150 for Flat Towing
    On your 2015 Ford F-150, we have a couple options for you to choose when wiring your vehicle up for flat towing. The first option and most labor intensive would be to use the Roadmaster 7-Wire to 4-wire Flexo-Coil Kit # RM-15247. This kit includes the diodes and wire that will allow you to hard wire into your Ford's lighting wiring harness. You then would run the wiring to the front of the truck and install the 4- wire round plug. The 7-way to 4-way Flexo-Coil will connect your motor...
    view full answer...
  • Recommendation of a Base Plate Kit and Tow Bar for Towing a Toyota Yaris
    If your Toyota Yaris is a 2007, 2008 or 2009 model then you can use the Roadmaster EZ Base Plate Kit, item # 521181-5. If your Yaris is a 2006 model the Roadmaster EZ Base Plate Kit, item # 521181-1, will work for your vehicle. Along with a base plate kit you will need a Towbar, and with the RoadMaster EZ base plate kits you can use any of the RoadMaster tow bars. The RoadMaster Tracker Tow Bar - 5,000 lbs, item # RM-020, is recommended if you will be towing infrequently and if you...
    view full answer...
  • Will the Blue Ox Aventa II Tow Bar Fit on Blue OX BX3503 Base Plates
    Yes. The Blue Ox Aventa II tow bar will work with the Blue Ox Base Plates # BX3503 without any issues on your 1992 Geo Tracker. You may also need a lighting solution for this new setup on your Tracker, so if you need lights also, the Roadmaster Standard Magnetic Towing Lights # RM-2120 are an easy to install choice that won't break the bank. A complete flat towing setup will consist of a tow bar, base plates, safety cables, tow bar lighting, supplemental braking and possibly a high/low...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Lindsey S
Updated by:
Lindsey S
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Jeff D
Installed by:
Jeff D
Employee Shane H
Installed by:
Shane H
Employee Jacob T
Video Edited:
Jacob T
Employee Michael B
Video by:
Michael B

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