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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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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 800-298-8924 for expert service.
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Optronics Trailer Lights - MCL67AB

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

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

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

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

Video Transcript for Optronics Trailer Lights - Clearance Lights - MCL67AB Review

Today we're going to be taking a look at part number MCL67AB. This is the Optronics Thinline Trailer Clearance or Side Marker Amber LED Light. It's a rectangular light that's going to function either as a clearance light or side marker light. It is going to be sonically sealed with a waterproof lens and housing unit. It's going to feature the amber polycarbonate lens. Again, this is a LED system. It is going to contain three diodes.

LEDs are great; they're going to be great replacements for incandescent lights. They're going to last about 50 times longer. They're going to be more efficient and you don't have to worry about replacing bulbs or brittle filament. It's going to feature a multi diode design; it's going to optimize your light output. It's going to feature the molded plastic housing. These two pieces here disconnect.

This is actually your mounting base. This is going to be your ground connection. It lines up with the mount hole so it's designed to be grounded through mounting hardware. Mounting hardware is going to be sold separately. It's going to mount on the surface of your trailer.

It's got the nice single wire design. You can see on the back of the actual plug it's got the two-prong design. Plugs into the connection there on the base and then it feeds out for just a one-wire connection. This is P2 rated. We're going to take a look at the overall dimensions, including the base. It's going to give us an overall length measuring from edge-to-edge of about 4-1/8".

Measuring this direction, outside edge to outside edge of the light we're looking about 1-1/4" and then going this direction from the very back to the very front we're also looking at about 1-1/4". Here on the backside it's going to expose your mounting holes. These are going to be separated on center by 3". This light is going to draw 0.048 amps at 12.8 volts. Optronics is going to put a lifetime warranty on the LEDs. Real quick I want to go ahead and hook it up to our power source and show you what it looks like with power running to it. Since it mounts through the mounting hardware, I'm going to remove the base and just simply connect directly to the back prongs here. I'll make our ground connection and then we'll connect our power. I'll turn off our overhead light so you can get a better look at that. You can see there it's got three diode design. Produces plenty of light output, nice strong signal, consistent, again LEDs are going to be more efficient. They're going to last a lot longer and they're going to optimize your light output with a multi diode design. That's going to do it for today's review of part number MCL67AB. This is the Thinline Trailer Clearance or Side Marker Light from Optronics.

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   (1574 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.


Great price and worked good. Wished could have found the light cheaper without black adapter. Rest of trailer is gray. 321995

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!
-- 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! 553863


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? 591957


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. 505040


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. 738571


Survived a whole year of boating season. Nice and bright. 653752


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...... 638556


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. 610349


This is a good replacement for my boat trailer markers...didn't even have to drill new holes. 607994


Easy to install, bright LED's, great replacement for my old incandescent fixtures. 581434

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



Perfect size lights we wanted and fast delivery! Will definitely recommend to friends and family! 522987


Easy to use website with lots of information. I'll be back when I am in needof your products. 465856


Only took a few minutes to install. Looks and works great. GREAT price. 424794


These are very good led lights. Highly visible at night and during the day. Replaced the missing light perfectly. 423530


I needed a replacement running light for a trailer. This one worked great as a replacement. 406652


Great service The LEDS look better than old lights. Easy install 368661


Great selection. Easy to manage site. Very timely delivery. All products received as ordered. 362731


Excellent customer service, lights look to be great quality, and you cannot beat the price. Will shop here again. 350406


Had to replace broken side marker. Works great. Thanks. 287459


Works as expected. 248875


Works just as advertised. No issues. 122005


Review from a similar Optronics Thinline in Trailer Lights

Very fast deliver and products were both exactly like I expected. They were a universal fit for my exact trailer and you can't tell they were replacements, which is exactly what I wanted. 714937


Review from a similar Optronics Thinline in Trailer Lights

Bought these lights to replace on our horse trailer. They work great, easy to install and look better than the original lights we replaced. Would buy these lights again and would recommend. 666349

- MC65RB

Review from a similar Optronics Thinline in Trailer Lights

So glad to have etrailer to go to for parts and sound clear advice. It's always a good experience with etrailer. 649812


Review from a similar Optronics Thinline in Trailer Lights

Hi Ashley, Got two lights to put below the tailgate on my PU Truck, there still working very good. I sent you folks a picture. Thank You Wendell 633939

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...

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Info for this part was:

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

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