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Thinline LED Trailer Clearance or Side Marker Light w/ Bracket - Submersible - 3 Diodes - Amber Lens

Thinline LED Trailer Clearance or Side Marker Light w/ Bracket - Submersible - 3 Diodes - Amber Lens

Item # MCL67AB
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Optronics Surface Mount Trailer Lights - MCL67AB
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4-1/8" x 1-1/4" Rectangle. Waterproof, LED trailer light serves as either a side marker light or clearance light. Durable polycarbonate housing and lens. Surface mount with bracket. Single wire grounds through mounting hardware. P2 rated. Lowest Prices for the best trailer lights from Optronics. Thinline LED Trailer Clearance or Side Marker Light w/ Bracket - Submersible - 3 Diodes - Amber Lens part number MCL67AB can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (2105)
  • Q & A (13)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - MCL67AB

  • Clearance Lights
  • Rectangle
  • LED Light
  • Amber
  • 4L x 1W Inch
  • Surface Mount
  • Rear Clearance
  • Side Marker
  • Submersible Lights
  • Optronics

4-1/8" x 1-1/4" Rectangle. Waterproof, LED trailer light serves as either a side marker light or clearance light. Durable polycarbonate housing and lens. Surface mount with bracket. Single wire grounds through mounting hardware. P2 rated.


  • LED trailer light functions as a clearance light or side marker light when properly mounted
  • Thinline Series has a low profile so that light can fit in tight spaces
  • Sonically sealed, waterproof housing and lens unit is submersible
  • 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
  • Amber lens over white LEDs
  • Compatible with 12V DC systems
  • Surface mount on trailer with included black bracket
  • Single wire design ground through mounting hardware
  • P2 rated


  • Dimensions: 4-1/8" long x 1-1/4" tall x 1-3/16" deep
  • Mounting holes: 3" apart on center
  • Diodes: 3
  • Power draw at 12.8V: 0.048 amps
  • Lifetime warranty on LEDs

Optronics MCL67AB ThinLine LED Clearance Marker Light Dimensions

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.

P2-Rated Lights

Diagram of light spread for P2 rated light

A P2-rated light produces a 45-degree angle of light to either side of its centerline for a total of 90 degrees of coverage. This beam pattern can be seen straight on, but it cannot be seen clearly from the side. So this type of light can be used as either a side marker light or a clearance light, but it cannot function as both. If you need both functions, then you must install 2 separate lights on your trailer - one as a front or rear clearance light and one as a side marker light.

Surface-Mount Light

Surface Mount Trailer Light Installation Diagram

Surface-mount trailer lights install using a flange or bracket with mounting holes. These lights lay flat against the trailer surface and only require a small, often pre-existing hole, for wiring. Mounting hardware is used to secure the light to the trailer.

MCL67AB Optronics Thinline LED Clearance or Side Marker Trailer Light w/ Black Bracket - Submersible - 3 Diodes - Rectangle - Amber Lens - P2 Rated

California residents: click here

Customer Reviews

Thinline LED Trailer Clearance or Side Marker Light w/ Bracket - Submersible - 3 Diodes - Amber Lens - MCL67AB

Average Customer Rating:  4.9 out of 5 stars   (2101 Customer Reviews)

4-1/8" x 1-1/4" Rectangle. Waterproof, LED trailer light serves as either a side marker light or clearance light. Durable polycarbonate housing and lens. Surface mount with bracket. Single wire grounds through mounting hardware. P2 rated.


I recently replaced my trailer lights with the thinline LED's. I like that they are completely sealed and they're very bright for the size.


These lights went in nicely and have proven to be reliable. Thank you.


It works lime its supposed to. Ga e it a lower rating because the housing on 3 out of 7 were cracked when I opened them. Didn't have to time go through all the BS with return and waiting for new ones, they all work bit for how long Idk.


They worked out perfect as a replacement to my old lights. Had to do a little bit of customization to fit them to my trailer but I expected that I would. They look great and give off some nice light. I would for sure buy them again.


Going to be a good replacement for the light I had on my trailer.


Folks, I decided to completely revitalize/upgrade my 20 year old bass boat trailer and found that not only could i find all the updated parts i needed, (led lights and urethane bow rollers, etc), at one location, additionally itrailer.com has a video for just about each part, where they share different measurements etc that may not be on the standard part description. These videos provided me with all the information i needed while configuring my retrofit. Additionally, when I placed my order, I received a personal email from the guy who packed my shipment., confirming that all the parts i ordered where in stock and now on the way. I typically never write these type of endorsements, but I felt compelled to write this one. Great service and all the parts I purchased have met my expectations. I'll be back when I need additional trailer parts.


Easy install, just 2 #10 x 3/4" bolts. It's self grounding. Well made, bright, and a simple snap in lens if it should burn out or get cracked. I would suggest cutting the wire off your existing light and splice it to the black wire. The black wire is a bit short if you are trying to splice directly to your main wiring. I know from experience.


This is a good replacement for my boat trailer markers...didn't even have to drill new holes.

still working
Brian K - 02/26/2020


I prefer lights that don't need an additional grounding wire. These have a metal bracket on them so when you mount them with your bolt or screw, it grounds the light. Pretty bright light, zero complaints. However I will say i was surprised they don't come with any bolt/nuts or screws. For me that was no big deal since i have both on hand, ended up using some self tapping pan head screws that were zinc plated. To lazy to get the drill set out.. I cut the tip of the connector off and ended up using a heat shrink crimp connector.


Great product, easy to install.


Have had these lights on my trailer for a year now. Still working good. Using the trailer about once a week now. Really show up at night.


Again a perfect fit for our Haulmark cargo trailer. These are the OEM equivalent with LED lighting. I installed a white 14 gauge pig-tail wire for extra grounding purposes and they work great. I would buy them again, so thanks again etrailer......


Great price and worked good. Wished could have found the light cheaper without black adapter. Rest of trailer is gray.

Thanks for the review, Phil! I have a solution for you! You can replace the black bracket with the Optronics chrome bracket A67CB, or the gray bracket A66pb. This part would better match your trailer. Hope this helps!
-- Etrailer Expert Laura E - 12/07/2016

Working great. As stated wish could have found just the light. Black adapter not being utilized.
Phil S - 01/02/2018


Replaced DZ part # 77-825 with these new led lights on my 1981 Avion camper. Looks and works great! Video of product mounting was very helpful in choosing these lights. One of the best websites I’ve ever come across. Thanks for the help from your team!


Great product quick shipping


Great product but even better customer service. etrailer is now my go to spot for all my trailer needs.


Easy to install, bright LED's, great replacement for my old incandescent fixtures.

Slill working flawlessly after one year
JW - 11/10/2019


I ordered replacement LED lights for a trailer I have . The web site was clear and easy to navigate prices are fair and delivery was prompt. What more can I say?


Great products with great service. Would definitely order from them without hesitation again.


Product was as advertised, quick shipping and good price. Thank you!


wish pig tail on light was a little longer had to use a jumper wire to make connection to trailer wire. Other then that their going to work.


Great service The LEDS look better than old lights. Easy install


I needed a replacement running light for a trailer. This one worked great as a replacement.


It is as ordered, works well.


it took a while to get here but thanks

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • Wall Adapter Compatibility with 12 Volt Clearance Light
    SInce it has a single wire, it is a clearance light. You will use the mounting bracket as your ground as you stated and run 12v power to the wire. You can use a 12v marine battery connecting the negative to the bracket and the positive to the wire. If you want to install a switch like # PK34513 in line that will work well. You can use wire like the 14 Gauge Primary Wire - Yellow - per Foot # DW02412-1. If you want a converter, you can use the # 329-GENIUS2D to connect to a standard...
    view full answer...
  • What Hardware Is Needed To Install the Thinline LED Trailer Clearance or Side Marker Light MCL67AB
    The Thinline LED Trailer Clearance or Side Marker Light part # MCL67AB is a surface mount light that has two mounting holes which you will see once the lens is removed. In order to mount this you can use pretty much any self tapping-screw like the Self-Tapping Phillips Head Screw part # 1131832. The Self-Tapping Phillips Head Screw could be used to mount most of our trailer side marker/clearance lights.
    view full answer...
  • Grounding Side Marker Lights with 1 Wire
    If your side marker lights use 1 wire like the Thinline LED Trailer Clearance or Side Marker Light # MCL67AB then you actually won't route a ground wire to them as they will ground through the mounting hardware. If you are finding a way to attached your white ground wire to these lights that only have 1 wire then that could very well be your problem. Just make sure that the 1 wire is connected to your running light circuit and that they are connected to a clean, bare-metal surface for...
    view full answer...
  • Replacement Side Marker Light for Wesbar 203260 on Boat Trailer
    To replace the Wesbar 203260 side lights on your trailer, I recommend looking at the Optronics Thinline Trailer Clearance or Side Marker Light # MCL67AB. This light measures 4-1/8 inches long x 1-1/4 inches wide x 1-3/16 inches deep, which is similar to the dimensions on the Wesbar model which is, as you mentioned, no longer in production. The LED lights will also provide a nice upgrade over the original bulbs. LEDs are brighter, draw a fraction of the power and will last much longer...
    view full answer...
  • Troubleshooting New Trailer LED Side Markers Not Working
    The issue you are having still sounds like there might be a weak or bad ground on the new LED lights. The mix between them and the incandescent assemblies at the rear of the trailer should not be causing this problem so it has to be something specific with the new lights that were installed. Many LED trailer lights feature a 2 wire design (one for ground and one for power) and don't actually use the mounting hardware for its ground like with your old assemblies. If the new lights have...
    view full answer...
  • Why Does a Marker or Clearance Light Only Have One Wire
    The marker and clearance lights you have now ground with a single wire hence why you have two wires total, one for power and one for ground. If the marker or clearance light only has one wire then this wire is for power and the light grounds though the mounting hardware. When you determine which of the two wires you have is for power, you just simply need to cap the other one off. If the new light with only one wire is installed in a rubber grommet then you will need to run a ground wire...
    view full answer...
  • How Does Light with 1 Wire Ground
    When a single function light only has 1 wire, like the Thinline LED Trailer Clearance or Side Marker Light # MCL67AB, it means that it grounds through the mounting hardware. If the mounting location doesn't have a clean, bare-metal surface then you either need to clean it for a good ground connection or find an over head light that uses 2 wires for installation.
    view full answer...
  • Dimensions of the Optronics Thin Line LED Marker Light # MCL67AB
    The Optronics Thin Line LED Marker Light, # MCL67AB, is 4 inches wide and 1-1/4 inches tall. The base measures 4-1/8 inches wide by 1-1/8 inches tall. The screw holes on this light are 3 inches apart on center. I have attached a photo showing the dimensions for you.
    view full answer...
    Image 1 for
  • Can Ground Wire Be Attached To Optronics Trailer Light When Installing
    If you wish to attach all of your lights to one dedicated ground wire that will work fine for you. Please be aware that modifying the mount in any manner will void the warranty for the light. The # MCL67AB light is designed to be grounded through the mounting hardware. You will want to make sure you do not damage the light base when soldering a ground wire.
    view full answer...
  • Length of Wire of Thinline LED Trailer Clearance or Side Marker Light With Bracket
    Thanks for the nice words! To answer your question, the wire lead of the Thinline LED Trailer Clearance or Side Marker Light w/ Bracket - Submersible - Red Lens # MCL67RB and Amber Lens # MCL67AB is approximately 5 inches. The wire is actually attached to the bracket (which the lights plug into), the Black Bracket and Single Wire Plug # A65PB. I have added links to video reviews and an install for you to check out as well.
    view full answer...
  • Can Chrome Base A67CBPG Be Used with Trailer Lights # MCL67RB and # MCL67AB
    Yes, the lights part # MCL67RB and # MCL67AB can use the chrome base part # A67CBPG that you referenced. The lights come with the black version of this base so you could easily swap it out for the chrome one if you wanted.
    view full answer...
  • Replacement Clearance Light for 1999 EZ Loader Boat Trailer
    According to Wesbar, the lamp you specified was discontinued about 5 years ago. We have several clearance/marker lights that would work for you, but one of the closest to the 4-3/4 x 1-7/16 x 1-1/4 inch size of the original lamps is part # MCL67AB from Optronics. Instead of bulbs, the lamp uses LED's, which are brighter than incandescent bulbs, but draw a fraction of the power. The lamp measures 3-15/16 in length, 1-1/4 inches height and 7/8 of an inch deep. If you click the provided...
    view full answer...
  • Amber Trailer Light that Matches the Red Light Part # MCL67RB
    The amber light you're looking for is part # MCL67AB. Both it and part # MCL67RB measure 3-15/16 inches long, 1-1/4 inches tall, and 7/8 inches deep. I've linked videos on them both for you.
    view full answer...

Do you have a question about this Trailer Light?

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Info for this part was:

Employee DeAnne T
Written by:
DeAnne T
Employee Cole B
Installed by:
Cole B
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Wilson B
Updated by:
Wilson B
Employee Samantha S
Updated by:
Samantha S
Employee Brian T
Updated by:
Brian T

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