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
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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. Lowest 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 etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (5)
  • Q & A (2)
  • Videos (2)
  • Photos
  • Why etrailer?

Optronics Tow Bar Wiring - TLL21RK

  • Removable Tail Light Kit
  • Bypasses Vehicle Wiring
  • Optronics
  • Magnetic Mount
  • Universal
  • 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

California residents: click here

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

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Optronics Tow Bar Wiring - Bypasses Vehicle Wiring - TLL21RK Review

Speaker 1: Today we're taking a look at the Optronics magnetic LED tow light kit. These removable LED lights provide stop, tail, and turn-signal functions for your trailer or towed vehicle. This is designed for cars and trailers no wider than 80 inches. It's really great for flat-tow applications, like if you're flat-towing a vehicle behind an RV, and your vehicle's not set up to receive the wiring from the RV. This is a great, non-obtrusive option to consider, because it keeps you from having to do special wiring things to your vehicle that's towed behind the RV, and it's very easy to set up.It simply routes and plugs into a 4-pole connector on the RV. Plenty of wiring here to route the lights all the way back to the rear of the flat-towed vehicle or trailer.

Then you can stick these magnetic lights directly on there, and whatever signal that's being activated on the RV will be sent back to the magnetic tow lights at the back of your flat-towed vehicle or trailer.So it's easy to use, very quick. Temporary; they're not a permanent install. You use them when you need them, and you can take them off when you don't need to use them. They do feature a sonically-sealed design, so that's a waterproof housing and lens unit. Keeps out dirt, grime, and moisture.

We're looking at durable surface-mount technology when it comes to the construction of the LED circuit board, which better withstands shock and vibration, and allows improved heat distribution and an overall thinner construction.These are LED lights. They make great replacements for incandescent lights. They last longer, they burn brighter, they're more efficient. With LEDs you don't ever have to worry about replacing bulbs, and you don't have to worry about brittle filaments.We're looking at a durable polycarbonate housing and lens unit. Nice, strong, design.

And on the base we have the heavy-duty magnetic bases that allow the lights to secure on the vehicle's trunk or roof, or on the magnetic surface of a trailer, anything that you're towing behind your RV. It does have a protective pad on it, so that way it doesn't scratch or harm or damage the contact surface.Comes with a 20-foot wiring harness that can easily be routed from the tow lights up to the connection point on the RV. And then it also has the 4-pole flat connector that hooks up to the RV connection point. Does come with additional wiring with the 4-pole flat connector for wiring an RV without an existing trailer connector.This is Department of Transportation compliant. Each light lens area has a diameter measurement of about 4-1/4".

When it comes to the overall measurements, right here, starting at the base, we're looking at about 3-7/8" by 2-3/16". And the overall height measures almost six inches. It's really 5-15/16" tall. Again, the harness, your main harness, measures 20' long. That's from the lights to the 4-way flat plug. The wiring between the lights is 5'3". So that's the wiring that connects the lights together. The length of the additional wiring harness for the RV is 35" long.We have six LEDs per light. We're going to go and hook it up to power, that way you can see what it looks like with some power running to it, and then we'll also turn off our overhead lights so you can see it in a low-light setting.Here we have the running-light function. This is the taillights. Nice, soft, light output. Again, we have six LEDs per light, so we have a total of 12. And then when we activate the turn signal or the brake, you can see how the signal output increases. It'll do that same thing when we activate the turn signal. Do the other light as well. Same design, same level of brightness.When it comes to the power draw, at 12.8 volts for the stop and turn signal, we're looking at 0.36 amps. For the tail light we're looking at 0.03 amps. Optronics also puts lifetime warranties on the LEDs.That's going to do it for today's look at the Optronics magnetic LED tow light kit.

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   (5 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.


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. 589227

by: 08/08/2020



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. 854221


excellent, super easy to install and its operation super good. I recommend it 200% 825510


Great product, just as described. I am using it on my kayak trailer to replace the original incadescent lights. 651587


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Info for this part was:

Video by:
Andrew K
Installed by:
Colin H
Installed by:
Cole B
Video Edited:
Chris R
Edited by:
Daron K
Written by:
Brian T

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