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  1. Tow Bar Wiring
  2. Optronics
  3. Removable Tail Light Kit
  4. Bypasses Vehicle Wiring
  5. Magnetic Mount
  6. Universal
Magnetic LED Tow Light Kit - Weatherproof - Red Lens - 20' Wiring Harness - Qty 2

Magnetic LED Tow Light Kit - Weatherproof - Red Lens - 20' Wiring Harness - Qty 2

Item # TLL21RK
Our Price: $60.23
You Save: 25%
Tow Bar Wiring

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TLL21RK - Removable Tail Light Kit Optronics Bypasses Vehicle Wiring
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(2) 4" Diameter magnetic LED tow lights provide stop, tail, and turn signals for your towed car without splicing into its wiring. Heavy-duty magnetic bases provide a secure hold. 20-Ft harness with 4-Flat plug connects to RV. Great Prices for the best tow bar wiring from Optronics. Magnetic LED Tow Light Kit - Weatherproof - Red Lens - 20' Wiring Harness - Qty 2 part number TLL21RK can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (24)
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Optronics Tow Bar Wiring - TLL21RK

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

(2) 4" Diameter magnetic LED tow lights provide stop, tail, and turn signals for your towed car without splicing into its wiring. Heavy-duty magnetic bases provide a secure hold. 20-Ft harness with 4-Flat plug connects to RV.


  • Removable LED lights provide stop, tail, and turn signal functions for your trailer or towed car
    • Designed for cars and trailers no wider than 80"
  • Sonically sealed, waterproof housing and lens unit
  • Durable surface-mount technology (SMT) construction of LED circuit board
    • Better withstands shock and vibration
    • Allows improved heat distribution and thinner construction
  • LEDs make great replacements for incandescent lights
    • Last 50 times longer
    • More efficient - provide brighter light with less power output
    • No bulbs to replace - no brittle filaments
  • Durable polycarbonate housing and lens
  • Red lens over white LEDs
  • Heavy-duty magnetic bases allow lights to quickly secure on a vehicle's trunk or roof
    • 20' Wiring harness can be easily routed beneath the towed vehicle
  • 4-Pole flat connector hooks up to trailer connector at rear of RV
    • Additional wire with 4-pole flat connector included for wiring an RV without an existing trailer connector
  • DOT compliant


  • Light diameter: 4-1/4"
  • Overall dimensions: 3-7/8" long x 5-15/16" tall x 2-3/16" wide
  • Tow light harness length: 245"
  • Wiring length between lights: 63"
  • Length of additional wiring harness for RV: 35"
  • Diodes (per light): 6
  • Power draw at 12.8 volts
    • Stop/turn signal light: 0.36 amps
    • Tail light: 0.03 amps
  • Lifetime warranty on LEDs

Magnetic LED Tow Lights

A towed vehicle is required by law to have functional brake and signal lights that illuminate at the same time as the brake and signal lights on the motorhome or RV that is towing it. These removable tow lights make it easy to add running lights, brake lights, and turn signals to your towed car or trailer.

Simply mount the lights on your vehicle's trunk or roof with the heavy-duty magnetic bases. A 63" long section of wiring connects the tow lights, giving you enough slack to position the lights where you want them. Then run the 245" long wiring harness up to the front of your towed vehicle and across your tow bar and connect it to the 4-way flat on your RV.

If your RV doesn't have a trailer connector, then you can wire the extra 35" long 4-way harness that comes with this kit to your RV. And if your RV has a 6-way or 7-way trailer connector, an adapter (sold separately) will be required to connect the tow lights to your RV.

Sonically Sealed, Waterproof Trailer Light

The waterproof construction of this light makes it ideal for use on trailers that may be submerged, like a boat trailer. The housing and lens are sonically sealed together to create a single unit, which means that water will not get into the light and damage the diodes or circuit board.

TLL21RK Optronics Magnetic Mount LED Towing Light Kit w 20' Wiring Harness - Red Lens - Waterproof

This Product Fits The Following Vehicles

California residents: click here

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Customer Reviews

Magnetic LED Tow Light Kit - Weatherproof - Red Lens - 20' Wiring Harness - Qty 2 - TLL21RK

Average Customer Rating:  4.8 out of 5 stars   (24 Customer Reviews)

(2) 4" Diameter magnetic LED tow lights provide stop, tail, and turn signals for your towed car without splicing into its wiring. Heavy-duty magnetic bases provide a secure hold. 20-Ft harness with 4-Flat plug connects to RV.


The wiring length should be increased by at least five feet. We have a small vehicle and still needed to use an extension. Otherwise it is a terrific solution.


Bought these magnetic trailer lights for my hitch-mounted e-bike rack. With two bikes on the rack, the rear car lights are partly obscured. These lights attach firmly to the rack with the magnets but I will secure them with straps as the rack surface is rounded. Plenty bright. Haven’t gone any distance yet, but I will drive reassured that the cars behind will better see my braking and turning.



Just fine!

1991 Isuzu Trooper

These work fine and are bright. I plant them behind my toad's roof rack and add a little duck tape for security. I have lost other ones before. It may be overkill on these as magnet is good.


Great product. easy to install and adj ust


Come in on the date you said it would. Thank you e trailer

2013 Fiat 500

I've seen magnetic tow lights before but not like these LED's. As soon as they arrived I opened them up, checked them out and they are very well built,the magnets seem very firm and they are BRIGHT. The video on the ETrailer site does no represent how bright these light are in my opinion. Very pleased with the quality and how visible these lights are.


Great product, just as described. I am using it on my kayak trailer to replace the original incadescent lights.


These magnetic lights are just what I need for the car that I am towing behind my RV !


Very good quality,works well, just what I was looking for.


Works as advertised!

1998 Toyota 4Runner

excellent, super easy to install and its operation super good. I recommend it 200%


A high quality product and very easy to use for safely towing.


entrails is first class from the product to the packaging shipping and customer service. Truly A+








2021 Chevrolet Equinox



2006 Ford Van



See what our Experts say about this Optronics Tow Bar Wiring

  • LED Tow Bar Lighting Kit that Could be Used on Trailer or Flat Towed Vehicle
    Sounds like you are looking for a set of LED magnetic tow lights like the part # TLL21RK that you referenced. This is only way to add temporary lights to a trailer or flat towed vehicle like you mentioned and is LED like you want as well.
    view full answer...
  • Recommended Magnetic Towing Lights For 2015 Volkswagen GTI On Tow Dolly
    I recommend using magnetic lights like part # TLL21RK. These have a 4-way harness and since these have red LEDs you have much less current draw than using incandescent. These lights have a 20 ft long harness and also a 4-way connector.
    view full answer...
  • How Strong Are The Magnets On The Optronics Magnetic LED Tow Light Kit?
    Optronics does not have a weight rating for their Magnetic LED Tow Light Kit # TLL21RK, however, this magnet is very strong and has been road tested at high speeds in varying weather conditions. This product is also made from durable polycarbonate, and is sonically sealed to waterproof the lens and housing from weather damage.
    view full answer...
  • Portable LED Lights with 4-Pole Connection
    Optronics LED Combination Tail Light Kit # TLL9RK has lights that use a separate white ground wire that normally would ground to the trailer. Then the trailer 4-pole wiring would in turn carry that ground back to the tow vehicle via its 4-pole wiring. One way or another these lights' ground must connect to the vehicle's ground. There is an easier solution for temporary lighting, a portable LED light kit like # TLL21RK. This kit includes two magnetic-base lights with a prewired 4-pole with...
    view full answer...
  • Available Magnetic Type Tow Lights for Flat Towed Vehicle
    Stop, turn and tail light functions can be provided by basic 4-pole wiring, such as by the trailer wiring harness # 118552 that fits your 2014 Patriot or a flat towing (dinghy) harness that connects the RV lighting signals to the dinghy. If you are looking to add the cargo box lights as supplements to your standard flat tow lighting you will want to consider a few things. First, additional lights will demand more power and so I suggest using high-efficiency LED type lights that will be...
    view full answer...
  • Lighting Options for Flat-Towing 1997 Jeep Wrangler With a Truck
    There are several options for lighting kits to allow flat-towing a vehicle. These range from the easiest-to-install and remove magnetic types, to independent bulb-and-socket kits that bypass the dinghy's wiring to hard-wired diode kits that require cutting into the dinghy's wiring. For ease of installation the magnetic type will be preferred as these require no alternation of the towed vehicle; they are also a cost-effective option. For example, Optronics offers their # TLL21RK 20-Foot...
    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...
  • Recommended Temporary Brake Lights For 10 Foot Box Truck
    I recommend to use Magnetic LED Tow Light Kit - Weatherproof - Red Lens - 20' Wiring Harness part # TLL21RK which plugs into a 4-way connector on the truck. The lights will act as running, brake lights and turn signals once plugged in. However, they are designed for flat towing a vehicle so you may consider checking into the laws of your state before using these on the box truck just to be safe. If you do not have a 4-way connector please let me know the year make and model of the truck...
    view full answer...
  • Interference Between Wireless Magnetic Tow Lights and Portable Proportional Braking System
    I spoke with my contact at Roadmaster and he said if you are using wireless magnetic tow lights like # NV-5164, or any other wireless device or product, there is a good chance you will get feedback or interference with the Roadmaster Even Brake Portable Proportional Braking System # RM-9400. The interference can cause false readings or false signals, therefore wireless magnetic tow lights are not recommended. As an alternative you can use a magnetic tow light set which plugs into your...
    view full answer...
  • Why Can Optronics Magnetic Tow Lights Only be Used with Vehicles Under 80 Inches
    There are certain lighting requirements for vehicles or trailers that are over 80 inches wide that magnetic lights such as # TLL21RK cannot provide. You would need front and rear clearance lamps that are mounted at a 45 degree angle (PC rated). So if the back of the vehicle was a square for example, the light would be at the corner pointed half way between the side and the rear of the vehicle. They need to be placed as high as possible. You also need rear identification lamps (3) centered...
    view full answer...
  • Lighting Options for 2016 Lincoln MKX that Is Flat-Towed Behind Motorhome
    It sounds like you need a flat-towing wiring harness to allow your motorhome to control the lights on the towed MKX. There are several options for flat-towing lighting and these vary in cost, complexity of installation and in how permanent that installation is. With a brand new vehicle like your MKX you can consider a set of magnetic lights like # TLL21RK, which uses a 4-pole flat type connector. This kind of lighting kit means you do not have to cut into the brand new car's wiring or...
    view full answer...
  • Both Turn Signals Blink on MaxxTow Tow Lights # MT70097 When Tow Vehicle Signals Are On
    If both the left and right turn signals on your MaxxTow Tow Lights MT70097 blink when either turn signal is activated on the tow vehicle the first thing to check is the condition of both connectors. Since the left- and right-turn signal circuits on a 4-pole are adjacent to each other (green and yellow wires), it is possible that corrosion in the connector can cause these two separate circuits to become bridged together. This condition could also explain the dim light output, since two...
    view full answer...
  • 4-Pole Light Kit for Use with Tow Dolly
    If you need to tow your Prius on a tow dolly that does not include built-in lighting then you can easily use a set of magnetic tow lights such as # TLL21RK or # TL21RK. Both these use a 4-pole flat type trailer connector. The Roadmaster tow dolly # RM-2050-1 has built-in lights.
    view full answer...
  • Portable Magnetic Lights Recommendation For Trailer
    We do offer some magnetic lights that may work well for you. I recommend the Optronics Magnetic Tow Lights, part # TLL21RK. These have red lights which act as running lights, brake lights and turn signals. These lights have LEDs which have increased brightness and draw less power. These magnetic lights come with a 20 ft long wiring harness and the 4-way plugs.
    view full answer...
  • Do Vehicle Taillights Need to Function If Vehicle is Towed with Tow Dolly
    Generally, you don't need additional lighting when using a tow dolly that already has lights. However, it's not a bad idea to check with the local laws in the states you'll be traveling in. If you do need to have lights on the vehicle you could use the magnetic LED tow light kit part # TLL21RK and to add a 4-way to your tow vehicle's wiring you would want the part # 18252 which would wire into the current trailer wiring.
    view full answer...
  • Tow Bar Wiring Options for 2015 Chevrolet Malibu
    Since this is a universal-fit kit it will work on multiple vehicles; it will work on your 2015 Malibu. Different light styles between the 2012 and 2015 model year Chevrolet Malibu mean this harness will not fit a 2012 Malibu but it will fit your 2015, the Roadmaster 6-Diode Universal Wiring Kit # 154-792-118158. If you prefer a simpler tow bar lighting option you can instead go with easy-to-install magnetic tow lights such as the Optronics # TLL21RK. These require no modifications to your...
    view full answer...
  • Which Tow Bar Light Kit for Flat-Towing 2011GMC Acadia
    The RoadMaster Bulb and Socket Set for Tail Light Wiring Kits, part # RM-155-2, is not compatible with your Acadia lighting system. These incandescent bulbs will not fit in your tail light housing due to the presence of the circuit board that powers the Acadia's LED lights. Also, they would generate much more heat than the specified LED bulbs and might interfere with the nearby circuitry. If you will be towing your vehicle only on occasion, you may want to consider a magnetic towing light...
    view full answer...
  • Tail Lights for Motorcycle Carrier that Blocks Tow Vehicles Lights
    If a motorcycle on a hitch mounted carrier is blocking your vehicle's tail lights and turn signals then it will be illegal to use in day or night. If you have a 4-way trailer connector you can use a cargo carrier light kit, like # e98943-44LED. These are designed to be installed on a cargo carrier but they'll work for your application. You'll need to find a way to mount them though. Another option is a magnetic light kit. The Magnetic LED Tow Lights # TLL21RK plug into the vehicle's...
    view full answer...
  • Tow Bar Lighting/Wiring Options for Flat-Towing a 1994 Jeep Wrangler
    The Roadmaster Universal Hy-Power Diode Wiring Kit you referenced, part # RM-154, will work on your 1994 Jeep Wrangler. This kit includes the 4-pole connectors, diodes and wiring components for installation that will allow your Wrangler tail light bulbs to operate in tandem with your RV. This is a great option for frequent flat-towing. I have linked an install video for your reference. A simpler option, and one that does not require any alteration to your toad wiring, is to use a plug-in...
    view full answer...
  • Tail Lights Covered By Bike Rack Solution
    The lights on the Demco Tow Lights w/ Wiring Harness # DMKKLB do not adjust from the vertical 180° position. The feet on # DMKKLB do adjust positions left and right for different angles. I recommend using the Roadmaster Standard Magnetic Tow Lights # RM-2120 to alleviate your blocked tail lights. The harness plugs into your 4 way flat trailer harness and uses magnetism to secure to the back of your vehicle. If you have nothing for the magnets to stick too, you can use # 3378895404 to fix...
    view full answer...
  • Adapting 6-Pole Square RV Connector to 4-Pole Flat Connector for Use With Optronics Lights # TLL21RK
    There is no plug-in adapter available to mate a 6-pole square RV connector directly to a 4-pole flat connector, but we do offer a 6-Pole Square Trailer Wiring Connector Kit, part # 37995, that can work for you as long as you do not have a Jayco RV (which can have compatibility issues with this part). Hopkins Connector Kit # 37995 includes both male and female connectors. You can cut off the 4-pole flat connector from the MaxxTow Magnetic Light Kit and splice in the male 6-pole connector...
    view full answer...
    Image 1 for Image 2 for
  • Flat Towing Wiring Harness for 2010 Chrysler Town and Country Limited
    The options for wiring/lighting kits for towing the van behind your Beaver motor coach can be seen by clicking on the link provided. The Beaver website does not include wiring diagrams for its Class A, B, C or 5th wheel RVs but I was able to find a wiring diagram for the van by doing a Google search on the phrase '2010 Chrysler Tow and Country wiring diagram'. This may well also appear in your owner's manual. These choices include diode kits like the Roadmaster # 154-792-118158 and magnetic...
    view full answer...
  • Recommended Parts to Equip Second Vehicle for Flat Towing Behind Motor Home
    To set up a second vehicle for flat towing behind your MH you will need to get vehicle-specific base plates and possibly also a lighting solution, depending on what you're using. The same tow bar and safety cables can be used, as long as the second set of plates works with your tow bar, and possibly the supplementary braking system as well, if it is a portable type like the Blue Ox Patriot # BLU37TR. If you are using easy-install magnetic tow lights like # TLL21RK then these are easily...
    view full answer...
  • Can a 2015 Toyota Camry Be Dolly Towed?
    According to the owners manual for your 2015 Toyota Camry it can be pulled by a Tow Dolly # DM9713093 with the front wheels off the ground in an emergency situation. The only specification was to release the parking brake so your transmission can be left in park. Be sure to verify the laws where you will be towing as you may need a Tow Light Kit # TLL21RK to remain legal.
    view full answer...

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Info for this part was:

Employee Andrew K
Video by:
Andrew K
Employee Jameson C
Expert Research:
Jameson C
Employee Colin H
Installed by:
Colin H
Employee Cole B
Installed by:
Cole B
Employee Chris R
Video Edited:
Chris R
Employee Daron K
Edited by:
Daron K
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