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Optronics ThinLine LED Trailer Clearance and Side Marker Light - Submersible - 4 Diodes - Amber Lens

Optronics ThinLine LED Trailer Clearance and Side Marker Light - Submersible - 4 Diodes - Amber Lens

Item # MCL75AB
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3-15/16" x 1-1/4" Rectangle. Waterproof LED trailer light functions as a clearance light or side marker light when properly mounted. Surface mount - hardware not included. Accepts standard 1-prong or 2-prong plugs. P2 rated. Lowest Prices for the best trailer lights from Optronics. Optronics ThinLine LED Trailer Clearance and Side Marker Light - Submersible - 4 Diodes - Amber Lens part number MCL75AB can be ordered online at or call 1-833-496-1390 for expert service.
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Optronics Trailer Lights - MCL75AB

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

3-15/16" x 1-1/4" Rectangle. Waterproof LED trailer light functions as a clearance light or side marker light when properly mounted. Surface mount - hardware not included. Accepts standard 1-prong or 2-prong plugs. P2 rated.


  • Dimensions: 3-15/16" long x 1-1/4" tall x 7/8" thick
  • Distance between mounting holes (center on center): 3"
  • Diodes: 4
  • Power draw at 12.8V: 0.06 amps
  • LIfetime warranty on LEDs


  • Rectangular LED trailer light functions as both a clearance light and a side marker when properly mounted
  • 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
  • Amber lens over white LEDs
  • Durable ABS housing and acrylic lens
  • Compatible with 12V electrical systems
  • Surface mounts on trailer - hardware not included
    • Requires mounting bracket (A65B - sold separately)
  • Accepts industry standard 1-prong or 2-prong plug (sold separately)
  • P2 rated

Manufacturer Cross Reference
Light will work as an exact replacement for:

  • Truck Lite # 19250Y
  • Grote # 47493

Optronics MCL75 Series LED Marker Clearance Light Diagram

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.

MCL75AB Optronics Thin Line LED Trailer Clearance and Side Marker Light - Submersible - 4 LEDs - Amber Lens

Alternate part number: MCL-75AB

California residents: click here

Customer Reviews

Optronics ThinLine LED Trailer Clearance and Side Marker Light - Submersible - 4 Diodes - Amber Lens - MCL75AB

Average Customer Rating:  4.9 out of 5 stars   (1163 Customer Reviews)

3-15/16" x 1-1/4" Rectangle. Waterproof LED trailer light functions as a clearance light or side marker light when properly mounted. Surface mount - hardware not included. Accepts standard 1-prong or 2-prong plugs. P2 rated.


Worked exactly as intended! Converted entire trailer to LED


Great to know I've got spares in the Tool Kit should one ever go out while on the road. Super easy to change. Nice YouTube demonstrating that.


I bought my Haulmark 12'x6' Enclosed trailer used a few months back. The trailer was in good shape but the sun faded out the marker lamps. Since I use the trailer as a landscape equipment trailer I'm usually not working at night but now with the daylight savings hour change I find myself getting home when it's dark and now those faded lamps were bugging me. Since I've had great experience in the past with I decided to take the plunge and change out the 14 marker lights to their LED versions...Wow what a difference. Not only are my lamps no longer sun faded but they are bright! Definitely was worth the money and the installation was quick since they simply snap into place.


I decided it was time to repair the lighting on a 15 year old trailer due to several being broken, and the rest being very faded. I spent quite a bit of time on etrailer comparing options I finally settled on the 4 diode led's. I was excited to see the difference but was ultimately dissapointed with my decision to swap out the old incandescent with more costly led's as the new led lights put out significantly less light. As u can see in the pictures I did the passenger side first, then I took pics halfway thru. If u look at the driver side with old lights it has alot more light even though it only has only 2 working lights, compared to the 4 on the new side! In the front shot u can see the old on the right is casting 10 times the amount of light on the ground. On the plus side at least the orange is now orange, and the red is red instead of almost clear.

I will say the shipping was very fast, and the the customer service was awsome as always.


Very bright and work great! Excellent upgrade for a 2009 CargoMate Blazer 6 x 12.


These made swapping my horse trailer over to led lights a breeze! Arrived quickly and as usual great customer service from etrailer Staff!


Work as advertised. Very bright.


ordered to replace the faded lights on my trailer, fit perfectly. LED will reduce the draw on my light switch.


I replaced all the marker lights on my older enclosed trailer. Much brighter than the old bulbs.


Great replacement parts for my enclosed box trailer that was damaged in the Camp Fire in 2018. The trailer held up pretty well but the marker lights, tail lights and fender lights all melted during the fire. These were perfect replacements and mounted very easily.


Iz nice, high five!


I purchased LED lights to upgrade the lighting on my utility trailer. The lights exceeded expectations in regards to quality and I was very happy with the speed at which I received them. I have just purchased an additional used trailer and will be upgrading that one as well. You can expect another order from me soon.

Lights are still performing well after a year. No troubles here.
Tomk - 01/16/2018


Easy to install. Super bright at night and just as good during the day! Best prices hands down!


Great lights. I love the way they look on the trailer. It made a huge difference in the way it looks.


Installed these as replacements for the old incandescent lights of a similar style & they’ve been great. Brighter & clearer than the older version. I highly recommend them & strainer as a vendor…


Hello, I was able to get the Manufacturers name off of the trailer light that I needed to replace. I was a plug and play replacement,using the OPTRONICS LED light/lense MCL75B.
The price and shipping at was very reasonable!
Thanks !!!

Still working great !!!!
DAVE I - 04/28/2016


Oh my, was all a Twitter when they arrived. This was recommended by members from an RV club. I am replacing my old markers with led. First thing I noticed was the wire connection was um, not what I expected, but could work. Then I got your email, sweet. I watched the install video, oh pooh. These snap in a metal bracket, waaah, got no stinking bracket, I be old school, what a twit.

So, my question I guess is, can I buy these brackets for this light? I like the snap in place idea, the original is mounted with screws and prone to leaks. It was an oops getting these but, now that I learn more about them, I like them better.

We do indeed have the bracket youre needing, part # A65PB
Black Bracket and Single Wire Plug for Thin Line Series Trailer Clearance and Side Marker Lights
. Its also available in a chrome plated ABS as part # A67CB
Chrome Bracket and Single Wire Plug for Thin Line Trailer Clearance and Side Marker Lights
. Ill link these items below for you.
-- Etrailer Expert Mike L - 12/10/2018


Easy to install replacement still going strong


Besides etrailer being a great supplier and easy to work with, the lens was just what i needed and shipped quickly


These LED clearance lights are a great plug-in replacement for the original lights on my Featherlite horse trailer. Much brighter, which is safer.
Great service from eTrailer, ordered on Monday, received on Wednesday.

Still working great, bright lights all around.
John Y - 08/12/2016


Fast shipping!!! Great to deal with!!


The items I ordered came quickly after I placed the order. Replacing the old lights with the new LED lights was easy and it made a big difference in making the trailer easier to see not only at night but seeing the brake lights in the daylight hours. The roof hatch was a easy replacement for the original one. I know the metal one won’t crack and break like the plastic one that was original equipment. After investing in a trailer to haul the hot rod that has taken years to build, make sure the other guy that’s not paying attention can see you and your investment


EXACTLY as advertised. I called to place my order and was VERY impressed with the customer service 'attention to detail', quick product delivery, and product quality. Without a doubt, I will be ordering from in the future!

After a year, the lights still work like new!
TJ A - 09/02/2016


Excellent products. These lights work perfectly, are rugged and seem to last. The license plate lights are super bright so law enforcement have no problem reading the plate which avoids unnecessary stops. The lights are directs replacements as well so no modifications needed. Great products. I recommend etrailer to many of my friends and colleagues.


I bought the series of thin line replacement lights for my 2005 Haulmark trailer. They fit and worked perfectly, are as visible as the originals (with restored color as well - the old ones were sun-faded) while drawing much less power.

Now the 5 amp fuse that most cars have for a tail light will safely run all of the tail, clearance, and interior lights on the trailer without blowing the fuse.

The first time I plugged in the trailer with the original lights it blew the fuse (without even the interior lights on).

Buying these lights was the perfect solution. Now any flat 4-wire plug on any car can be used to operate the trailer.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Replacement LED Trailer Clearance Side Marker Light
    For the Thin Line LED Trailer Clearance, Side Marker Light, part # MCL75AB you can place the item in your shopping cart and and click Calculate Shipping. Then follow the prompts to see what the shipping options are for the item. Regarding vendors in Florida, I am not familiar with any stores that would carry this item. I have attached a product review video for the light you can check out.
    view full answer...
  • How to Ground an LED Trailer Light to a Trailer with a Fiberglass Body
    What you would need to do is run a jumper ground from the grounding point on light # MCL75AB to a metal location nearby. You can use the frame or a metal support structure if available. This may require some additional work because you will have to route a wire somewhere for the ground but it will work out just fine.
    view full answer...
  • How Do I Add LED Lights To My Shopping Cart?
    The Sealed, Thin Line LED Trailer Clearance, Side Marker Light, 4 Diode - Amber # MCL75AB is a really nice light. I've added a couple of videos for you so you can see the review and installation. To add these to your cart, simply scroll down until you see the yellow highlighted "add to cart" and click that with your mouse. It is a button to take you right to the cart where you can select the quantity you desire by adding it to the box. If you want to view the product again prior...
    view full answer...
  • Clearance Light Replacement Recommendation for TruckLite Model 19
    I looked up your TruckLite Model 19 and the Sealed, Thin Line LED Trailer Clearance, Side Marker Light # MCL75RB is a match for what you have and would be exactly what you would need. For amber you'd need the part # MCL75AB.
    view full answer...
  • What is Difference between Miro Flex and Thin Line Optronics Clearance Lights
    The Miro-Flex part # MCL63AB and the Thin Line part # MCL75AB are both very similar. They essentially are just visual differences for the lens. The Miro Flex has more of a Euro style look where you can see the diodes and the reflective base in the light whereas the Thin Line has the diodes obscured. Both would work well and I would recommend you pick which you like the appearance of more.
    view full answer...
  • Replacement Clearance Light for 1997 Champion Bass Boat
    The Miro-Flex Thinline LED Trailer Clearance or Side Marker Light # MCL63AB that you referenced will work great as a replacement for the clearance light on your trailer frame currently. For a mounting bracket that includes the wiring you'd want the part # A65PB and you'd be set.
    view full answer...
  • Would Sealed Thin Clearance Lights part # MCL75AB Fit a Horse Trailer
    The Sealed Thin Clearance Lights part # MCL75AB that you referenced would work great for you. They have a universal style installation so they would work well. You will need a mounting bracket for these though. For that you would want the part # A65PB. I attached an install video for this light for you to check out as well.
    view full answer...
  • How to Install the Optronics Clearance Light # MCL75AB into the Bracket Base # A65PB
    To install the Sealed, Thin Line LED Trailer Clearance, Side Marker Light # MCL75AB into the Black Bracket # A65PB it should be just a matter of lining up the light into the base and then pressing firmly to seat both sides of the light into the base. See the video I attached that shows how these two parts get installed onto a trailer for more information.
    view full answer...
  • Mounting Bracket with Wiring for Use with Optronics Trailer Light MCL75AB
    The correct mounting bracket to use with the # MCL75AB would be the part # A65PB which comes with the correct and easy way to wire up the light.
    view full answer...
  • Recommended 4" x 1" Clear Lens Side Marker Light With Amber LED Lights
    It sounds like you are looking for the Thinline LED Clearance or Side Marker Light - Submersible - 3 Diodes - Clear Lens w/ Amber LEDs # MCL65CAB which is the same dimensions of 4" long x 1" wide and style as the # MCL75AB you were looking at, but has the clear lens with amber LEDs you are looking for. If you also need the mounting bracket with the wiring connector you will need # A65PB. I included a video of the # MCL65CAB for you to take a look at.
    view full answer...
  • Can Optronics Thin Line LED Trailer Clearance Lights Fit Base Of Lights On Snowmobile Trailer
    I was not able to find the truck Lite 2303 or 2294 lights on their website. You may want to consider replacing most if not all of the incandescent lights on your snowmobile trailer. Since LEDs draw about 1/10 of the power, you can certainly get the draw down a lot more than what you are doing now. We do not have a converter box for a 10-amp load as you described. The # MCL75RB and # MCL75AB lights measure 3-15/16 inches L x 1-1/4 inches W x 7/8 inch D. and require the black base, part...
    view full answer...
  • Replacement Clearance Lights 1-1/4" Tall, 3-15/16" Long and 7/8" Deep With 2 Prong Connectors
    We have the Optronics Incandescent # MC65RB and Optronics Thinline LED # MCL75RB that use a red lens. The Optronics Incandescent # MC65AB and Optronics ThinLine LED # MCL75AB have an amber lens. A Optronics ThinLine LED # UCL65CB uses a clear lens with red LED's, and the Optronics ThinLine LED # MCL65CAB is a clear lens with amber LED's. We will not have any with a white light and clear cover.
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Is a Base Required for Mounting the # MCL63AB and # MCL75AB Trailer Side Marker Lights
    Yes, a mounting base is necessary for the # MCL63AB, you will need to use either the Black Bracket and Single Wire Plug, item # A65PB, or the Chrome Bracket and Single Wire Plug, item # A67CB with this light. The # MCL75AB, Thin Line Trailer lights also require a mounting base. Brackets for the # MCL75AB include the # A65PB and the # A67CB bases, mentioned for the # MCL63AB light.
    view full answer...
  • Is Optronics Thin Line LED Trailer Clearance, Side Marker Light Waterproof
    The Sealed, Thin Line LED Trailer Clearance, Side Marker Light, part # MCL75AB is sealed and waterproof and would work well on your boat trailer. This light measures 3-15/16 inches long X 1-1/4 inches wide X 7/8 inch deep. The mounts are spaced 3 inches apart. You will also need the bracket with plug for installing the # MCL75AB. For the black bracket base you would need to order part # A65PB, and for the chrome finish bracket you can order part # A67CB. I have also attached an installation...
    view full answer...
  • Replacing Existing Marker Lights on 2012 Haulmark Race Trailer with LEDs
    You can certainly replace your existing incandescent marker/clearance lamps with LED models. LEDs have many advantages over incandescent lamps. They have a much longer life, they draw a fraction of the amperage and are brighter. The Optronics LED Clearance and Side Marker Light you mentioned, part # MCL75AB uses a chrome # A67CB or black # A65PB mounting bracket. The lamp is fully waterproof. If you are looking for something that is a close replacement for your existing lights, I can...
    view full answer...
  • Availability of LED Replacement for Trailer Clearance Light Part # MC65AB
    The LED equivalent to the # MC65AB you mentioned is part # MCL75AB. We also offer the mounting bracket, which is available in black, part # A65PB or chrome, part # A67CB. To view a product demonstration video of the Optronics LED Clearance Light, click on the provided link.
    view full answer...
  • Power Draw of Optronics Trailer Clearance/ Marker Light # MC65AB
    According to my Optronics representative, the Optronics Sealed Trailer Clearance and Marker Light, part # MC65AB draws a total of 0.6 amps at 12.8-volts. An LED version is also available, part # MCL75AB which draws a fraction of that, 0.06 amps at 12.8-volts. Either lamp is used with a base, part # A65PB in black or # A67CB in chrome plated plastic. The lamp base has a single power wire, and picks up its grounding connection by its mounting hardware being connected directly to the trailer frame.
    view full answer...
  • How To Install The Optronics Side Marker Light # MCL75AB And Optronics Chrome Bracket # A67CB
    The Optronics Sealed, Thin Line LED Trailer Clearance, Side Marker Light, part # MCL75AB, has the tabs on the end that will snap into the open slots on the ends of the Optronics Chrome Bracket and Single Wire Plug, part # A67CB. See the picture to the right that will show the light snapped into the mounting bracket. The chrome bracket has two mounting holes that are spaced 3 inches apart (industry standard). These holes are where two screws will go through and attach the bracket to the...
    view full answer...
    Image 1 for

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Info for this part was:

Employee Mike L
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Mike L
Employee Michael H
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Michael H
Employee Jameson C
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Employee Jeffrey L
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Jeffrey L
Employee Andrew K
Video by:
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Employee Nicholas E
Installed by:
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Updated by:
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