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Optronics LED Trailer Clearance or Side Marker Light - Submersible - 6 Diodes - Red Lens - 24V
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Optronics

Optronics LED Trailer Clearance or Side Marker Light - Submersible - 6 Diodes - Red Lens - 24V

Part Number: MCL66R24B
In Stock
$13.08
Trailer Lights
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etrailer Installation
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4" x 1" Rectangle. Waterproof, LED trailer light serves as either a side marker light or a clearance when properly mounted. Durable polycarbonate lens and housing. Surface mount on trailer - hardware not included. 2-Wire design. P2 rated. Great Prices for the best trailer lights from Optronics. Optronics LED Trailer Clearance or Side Marker Light - Submersible - 6 Diodes - Red Lens - 24V part number MCL66R24B can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - MCL66R24B

Highlights

  • Reliable In Any Weather: Sonically sealed, waterproof housing keeps water from damaging LEDs.
  • Long-Lasting Light: LEDs last 50 times longer than bulbs—no filaments to replace.
  • Energy Efficient: Bright 6-diode red light draws just 0.057 amps at 12.8V.
  • Easy Mounting: Surface-mount design with 3" hole spacing installs without brackets.
  • Dual Function Use: Works as a clearance or side marker light when mounted correctly.
  • Road Legal: DOT compliant and P2 rated for proper light coverage and visibility.

Features to know about

Brighter Light with Less Power: 6-Diode LED Efficiency

No more dim or power-hungry bulbs. This Optronics LED light runs on 24V DC and uses six bright diodes behind a red lens to create clear, consistent illumination. It’s a clean upgrade from old incandescent lights—lasting up to 50 times longer and drawing only 0.057 amps at 12.8V. That means brighter light with less power draw and zero bulbs to replace.

Built for the Elements: Sonically Sealed and Submersible

Water, dirt, or vibration won’t bother this light. The housing and lens are sonically sealed into one solid piece, making it fully waterproof and submersible. Whether it’s mounted near the ground or exposed to splash zones, moisture stays out and the internal diodes stay protected. It’s a dependable choice for trailers that see rain, road spray, or even launch ramps.

Durable by Design: Polycarbonate Housing and Lens

The 4" x 1" rectangular body is built tough with a polycarbonate housing and lens that resist cracks and impact. Even with regular use in rough conditions, the lens stays clear and the light output stays consistent. It’s DOT compliant and P2 rated, producing a 90-degree total beam spread for solid forward visibility when used as a clearance or side marker light.

Simple Mounting, Clean Look: Surface-Mount 2-Wire Setup

Installation is straightforward with its surface-mount design—no base or bracket required. Just line up the 3" center-on-center holes, connect the two wires (power lead and ground), and you’re done. The result is a low-profile marker that sits cleanly against the trailer surface without extra hardware getting in the way.

Specs

Dimensions

  • Overall dimensions: 4" long x 1" wide x 1-3/16" thick
  • Distance between mounting holes (center on center): 3"

Dimensional diagram of Optronics MCL66 red LED trailer clearance or side marker light showing 4-inch by 1-inch size, 1-3/16 inch depth, and 3-inch mounting hole spacing.

Electrical

  • Power draw at 12.8V: 0.057 amps
  • System compatibility: 24V DC electrical systems (will also work with 12V DC system but with reduced light output)

Lighting

  • Diodes: 6
  • Lens color: Red
  • LED color: White
  • Rating: P2 rated

Construction

  • Housing and lens material: Polycarbonate
  • Design: Sonically sealed, waterproof, submersible unit
  • Mount type: Surface mount (hardware not included)
  • Wiring: 2-wire design (power lead and ground wire)
  • Compliance: DOT compliant

Warranty

  • LEDs: Lifetime warranty

MCL66R24B Optronics 24V LED Trailer Clearance or Side Marker Light - Submersible - 6 Diodes - Red Lens

Alternate part number: MCL-66R24B





Ratings & Reviews

4.8

3209 reviews
5 Stars
(2786)
4 Stars
(279)
3 Stars
(59)
2 Stars
(24)
1 Star
(61)
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by:
We were looking for lights that we could use on a trailer so it could be towed by a truck with either a 12 or 24 volt electrical system. These lights answer that need. They appear to be well made and are very bright.
by:
I like the looks of the product was a ease to hook up and work great for what it is being used for. The light is being used in a MC9 tour bus that iam redoing I used it for the restroom light to let someone no the restroom is being used, the current light was in bad shape. The bus is 24 volts system and I rate it to be excelient and the fast delivery of the product to me and price

Thanks Etrailer for your product
by:
Product as described and fast shipping! Excellent supplier!
by:
Have been dealing with etrailer for a while. Always seem to have what I need to take care of my customers. Great staff that is always very helpful. Products they carry are top of the line quality and good pricing.
by:
Great Product. Great people to work with. Great customer service.
by:
Great product holds up is all weather conditions and very bright will buy again in future thank you
by:
Looks great on my tractor.
by:
Good quality and quick delivery.
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These Optronic LED lites were exactly what I was looking for my boat trailer. Easy install and very bright. Good product and quick shipping. I highly recommend this company.
Mike L. profile picture
Etrailer Expert

Mike L.

3/31/2026

That's great to hear, Jim! I'm glad to hear your marker lights are working well for you. Where's your favorite boating spot? I really like Table Rock Lake in Missouri near Branson...

by:
Thought I was buying a pair wait a week to get them installed just to find out there was only one amd now have to pay shipping again to get the second one had that been clear in the beginning I would have ordered 2 and only paid shipping once and been able to get the lights amd woring on my boat trailer finished inst3ad of now paying double shipping and now waiting another week for the other light
by:
Boat trailer lights worked great
by:
The product arrived exactly on time and it was a direct replacement for the original light. Installation was a breeze so now I am ready for my fishing trip!
by:
The light works excellent. Unfortunately after I took the old one off I realized that the original was never wired up correctly from the factory lol. New light is much brighter so I might go ahead and replace the other two. Received very quickly.
by:
Had trouble tracking these specific lights down online. I have bought a few things from etrailer before and they always deliver exactly as advertised. These are a direct replacement for the lights that I had which seemed impossible to find!
by:
Received a large bolt. I ordered a trailer side marker light.
by:
The lights went on easy with one positive wire and ground. Being led makes it brighter than my old lights
by:
Ordered the LED trailer pucks. They came really quickly, and the bonus was they already had dielectric grease on the female contacts and ready to install. I was pleasantly surprised.
by:
I thought yall were just trailers , was not aware did boat as well, thanks deliver in great shape
Raymond profile picture

Raymond

5/24/2026

At first the light was brighter than the other lites on the trailer. It has settled down so as to match the brightness of the other lights.

by:
I bought the led lights over a year ago and even with MI winters and all the road salt the are still working perfectly. Great product you won't go wrong buying them.
Victoria H. profile picture
Etrailer Expert

Victoria H.

3/26/2025

Wow, that's great to hear that these have held up so well for you Pat! Keep shining bright :)

Pat profile picture

Pat

3/27/2026

Its been a couple years of Michigan weather and winters with the most hated road salt. The LED lights are still working without any issues. I still recommend buying these lights you wont go wrong.

Heather A. profile picture
Etrailer Expert

Heather A.

3/27/2026

@Pat Road salt can be brutal on lights, so it’s great to know they’ve held up that well over a couple of years without any issues. I really appreciate you sharing that kind of long term experience since that’s exactly what people are looking for when they’re deciding. What are you using the lights on?
by:
Exact fit, fast shipping!
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Info for this part was:

Employee Tyler C
Written by:
Tyler C
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
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Employee Noah M
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