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ThinLine Mini LED Side Marker or Clearance Light w/ Bracket - Submersible - 3 DIodes - Amber Lens
Optronics

ThinLine Mini LED Side Marker or Clearance Light w/ Bracket - Submersible - 3 DIodes - Amber Lens

Part Number: MCL-91AK
In Stock
$12.54
Trailer Lights
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2-1/2" x 1-3/16". Waterproof mini trailer light functions as a clearance light or side marker light when properly mounted. Durable polycarbonate lens. Surface mount with self-grounding bracket and hardware. 1-Wire design. P2 rated. Great Prices for the best trailer lights from Optronics. ThinLine Mini LED Side Marker or Clearance Light w/ Bracket - Submersible - 3 DIodes - Amber Lens part number MCL-91AK can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (223)
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Optronics Trailer Lights - MCL-91AK

Highlights

  • Reliable In Any Weather: Sonically sealed housing keeps water out for true submersible use.
  • Fewer Replacements Needed: LEDs last 50 times longer and draw just 0.051 amps at 12.8V.
  • Compact, Bright Design: 2-1/2" x 1-3/16" size with 3 diodes gives strong light in a small footprint.
  • Simple Install: Surface mounts with self-grounding bracket and single-wire hookup.
  • Durable Build: Polycarbonate lens and housing resist impact and corrosion.
  • Clear, Legal Performance: P2 rating provides 90° light coverage for clearance or side marking.

Features to know about

Brighter Light and Less Power Draw: Efficient 3-Diode LED Design

Older incandescent bulbs tend to fade, draw too much power, and burn out quickly. This compact light fixes all that with three white LEDs behind an amber lens that shine brighter while keeping the draw low—just 0.051 amps at 12.8V. The LEDs last up to 50 times longer than bulbs, and because there are no filaments, there’s nothing fragile to break. Once it’s mounted, you can forget about swapping bulbs or dealing with dim light again.

Built for Wet Conditions: Fully Submersible and Sonically Sealed

If your trailer ever gets dunked in the water or runs through heavy rain, this light is ready for it. The housing and lens are sonically sealed into a single piece so water can’t sneak in and damage the diodes or circuit board. That waterproof, submersible design makes it a solid choice for any job where moisture or spray is part of the routine.

Compact Size Without Compromise: Simple Surface Mount Setup

Space is often tight around trailer corners, but this light fits neatly anywhere. The light itself measures 2-1/2" wide x 1-3/16" tall x 7/8" deep, or 2-7/8" long x 1-1/2" wide x 1-1/4" deep with the included bracket. A surface-mount setup keeps things smooth, and the self-grounding bracket with hardware makes installation quick—just one power wire to hook up and you’re done.

Reliable Coverage Where You Need It: P2-Rated Beam Pattern

Visibility matters for safety, especially at night. This P2-rated light casts a focused beam that spreads 45 degrees to either side for a total of 90 degrees of coverage. Mounted properly, it works as either a clearance light or a side marker light to keep your trailer visible from the front or rear. That dependable pattern helps other drivers see you clearly when it counts most.

Durable Build That Lasts: Polycarbonate Lens and Lifetime LED Warranty

Road debris and vibration can be tough on lights, but this one holds up thanks to its polycarbonate lens and housing that resist cracking and impact. The LEDs are backed by a lifetime warranty, giving you long-term reliability without extra maintenance or worry down the road.

Specs

Dimensions

  • Dimensions: 2-1/2" wide x 1-3/16" tall x 7/8" deep
  • Dimensions with bracket: 2-7/8" long x 1-1/2" wide x 1-1/4" deep
  • Distance between mounting holes (center on center): 2"

Technical diagram of Optronics ThinLine Mini LED Side Marker or Clearance Light MCL-91AK showing rectangular amber lens, surface-mount bracket, and dimension labels for width, height, and mounting hole distance.

Electrical

  • Power draw at 12.8V: 0.051 amps

Lighting

  • Diodes: 3
  • Rated: P2

Warranty

  • Lifetime warranty: on LEDs

MCL91AK Optronics Thin Line Mini LED Side Marker and Clearance Light with Bracket - Submersible - 3 DIodes - Amber Lens

Alternate part number: MCL-91AK





Customer Satisfaction Score:

Ratings & Reviews

4.8

223 reviews
Review sort icon
2-1/2" x 1-3/16". Waterproof mini trailer light functions as a clearance light or side marker light when properly mounted. Durable polycarbonate lens. Surface mount with self-grounding bracket and hardware. 1-Wire design. P2 rated.

by:

These lights where bought as replacements for the same lights I bought 11 years ago. They go on the running boards of my Ford F250. 3 had gone dim so I replaced all 6 and these where exactly like the originals. Easy install and they are bright. Hope I get 11 more years out of these.



by:

The lights are excellent, a direct replacement. i ordered lights with the chrome frames but not really thinking I would actually use the frames, however trying to get the old lights out required either breaking them or the old plastic frames. Only 4 stars because the new frames require drilling new holes. I went through many websites and even yours I wasn't completely sure I was getting the right lights until they arrived.



by:

Great product snapped right into my existing frame. If I were to mount the light the mounting holes are on the small side. My existing holes are 1/4" and these are smaller. Not an issue just need a button head bolt and nut on the back for replacement. Very bright look great.



by:

The product is exactly what I ordered.
My
only question is;

My application is a surface mount? The wiring will need to be external of the bezel. If it were notched to allow this it would complete my application.

Thanks for your interest after the sale.

Ed M. profile picture

Ed M.

10/18/2014

The LED Markers are excellent. Bright and low voltage, just what I needed.The center BrakeStop light still is not installed. I live in a retirement community with lots of electronic experience and we cant figure it out. It will bench test but will not work with my golf cart wiring??? We think it is a ground problem that could be resolved with a new harness....but I would have to give up a day of golf ...choices choices choices.Thanks for your continued interest and I promise the next rainy day we will run a new harness.Ed McNamara



by:

Replacing incandescent for LEDs, on my boat trailer. I liked the chrome housing, same as my old ones. Have yet to put them on, will update review after that.

Swisher 1. profile picture

Swisher 1.

4/25/2014

Put them on finally, workslooks better than expected! Lights are soooooo much brighter than the old ones! Fantastic product!



by:

The LED lights are very good - very bright - but the mounting hardware to fit on a plastic boat fender is far from satisfactory. Two screws came with the lights which just won't work on pre-drilled holes from the previous lights. So a trip to the hardware store was my next step to purchase nuts, bolts and washers.



by:

I have an older Shorelander boat trailer and the running lights on the fenders were one missing and one cracked. I ordered these due to having the same dimensions and being LED. Installed them today and all holes lined up perfectly so no drilling needed and lights accepted original single wire plugs. Another successful project completed with parts from etrailer. Thank You etrailer!



by:

Bought a brand new trailer and from the get go some of the regular lights were intermittent. Finally had enough and ordered LED's to replace them all; have not had a single light issue over a year later. All were direct drop in replacements, fit and look great. Thanks etrailer.com!



by:

I love the LED lights!! They give me a brighter lighting around the trailer assisting me in attaching tie downs at night, I can clearly see the corners on my trailer while backing up. They look great and fit nicely on the my trailer.
Extremely pleased with etrailer.com and this product.



by:

Arrived fast and in good condition just as described and as shown in the picture



by:

These lights are still working flawlessly after one year of use. etrailer sells great products and their customer service is awesome !!!

Scott R. profile picture

Scott R.

5/18/2018

After 2 years these lights are still working without issue. Recommend this products!!



by:

Perfect fit a nd great price



by:

The lights work, BUT i had a major issue with the design.
The wire that provides 12V to the light has the potential to ground against the frame and documentation makes no mention of this. i blew every fuse in my truck because of this light direct shorting to frame ground and couldnt figure it out at first. upon taping the connection and replacing fuse it became clear. BE CAREFUL on how you install these connectors! a rather poor design to have so much wire sticking out of the back that can contact trailer frame! (having said that you tape them up right they work just fine.)



by:

Thank you for getting to me quickly. Great product and easy to install. Works great and bright. I might switch the other side out with one of these.



by:

The product performed as expected. It was easy to install and worked out of the box.
I was looking for a light that would provide a bright light and not consume a large amount of electrical current. These lights were installed on a boat trailer and I wanted something I did not have to worry about getting submerged when on.
They work great.

Barry W. profile picture

Barry W.

10/17/2017

Lights are still working great.



by:

Received as described.



by:

They are fast and great prices! Will buy from here again!



by:

Didn't like desing of lights.



by:

Replacement for my boat trailer. Exact fit for the original. Couldn't ask for better



by:

Ordering was a breeze, great price, and the got here pretty quick!



by:

Great replacements for my trailer, very bright and direct fit



by:

Worked well, very bright and easy to install. Lastly, shipping was extremely fast and it was well packed. Thanks Paula for your assistance.



by:

An exact replacement for the burned out side marker light.



by:

Great item perfect fi



by:

I had to provide other fasteners. My trailer fenders are composite so it had to be thru-bolted with #8 flat head machine screws. The extra wire to provide a ground was helpful.


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