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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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MCL75AB - Surface Mount Optronics Clearance Lights
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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 etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (1774)
  • Q & A (15)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - MCL75AB

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

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.


  • 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


  • 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

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   (1774 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.


Bought these lights to replace origianl lights on our horse trailer. Work great, look great, easy to install and would purchase again. 666351


Looks to be a quality product. Very fast delivery. The only problem was, it wasn’t clear to me, that this light did not have a mounting base. I have subsequently ordered the bases. I want to switch to LEDs on my RV. LEDs are more reliable. I haven’t received the mounting bases yet. Expect them soon. 658969


No information on how to hang or connect to 12 v. 585905

The lamp you purchased needs a mounting bracket like part # A65PB
Black Bracket and Single Wire Plug for Thin Line Series Trailer Clearance and Side Marker Lights
in order to be installed. The bracket includes sockets that receive the pins on the back of the lamp. Because there are a number of mounting options and kinds of brackets available, the bracket isnt included with the lamp. If you take a look at the links below, you can see the available brackets that are compatible with this lamp.
-- Mike L - 11/29/2018



Exact replacement for incandescent lights. Snaps right in. 873573


These made swapping my horse trailer over to led lights a breeze! Arrived quickly and as usual great customer service from etrailer Staff! 870222


These made swapping my horse trailer over to led lights a breeze! Arrived quickly and as usual great customer service from etrailer Staff! 870219


Easy snap in lens that I have in my tool box for the the new light I just installed Having a spare somehow seems to reduce the likelihood of damage to the trailer light or it burning out. 858848


I was amazed at how easy it was to install, and then for you to follow up! My that doesn't happen. You guys are the best. Thank you and God Bless You. 822341


just what I ordered 817671


Fairly easy to install would’ve liked him a little brighter 803338


Direct replacement for the lights on my Haulmark enclosed car trailer. MUCH brighter than the stock incandescent. 802555


Great product 797741


We have a 7x14 low rider trailer and replaced all lights and marker lights with LED lights. The figment was perfect and they look much better than original lights. 794393


Upgraded all lighting to LED lights on 2006 Haulmark utility trailer. The new LED lighting provides highly visible safety clearance lighting for night and day use. etrailer website is easy to use, my orders were quickly filled and promptly delivered. Good job! 791566


Nice easy way to switch over to LED. Same base as existing. 783615


I used this to replace a broken light on my horse trailer. it is working well. 768336


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. 757145


Product delivered as expected. I have a 2019 GMC truck, which is equipped with a overload relay for trailering lights. My 06 Haulmark motorcycle trailer is equipped with 18 running/side marker lights. It was pulling enough current to trip the relay. I had to remove 2 of the lights to keep it from overloading. I have repacked all 18 incandescent bulbs/lights with new LED lights & so far no more over load occurrences. New lights look good. Hopefully problem solved [thumbsd up]. 745241


Love these lights. Bright, low current draw, look good, easy to replace if they ever go bad. 692707


This lense was a great fit for a base that I selected. 686987




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 682101


lites worked fast excellent service 674877


Nice product, replacing all the lights on my horse trailer with LED 's ~ big difference,they are so bright. Love them. Easy installation ~ did it in about 15 minutes. Have stop lights coming ~ placed 2 orders. 671108


What I ordered. Got it quick. Keep up the good work. 663162

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • 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...
  • 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...
    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 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 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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,...
    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...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Jeffrey L
Video by:
Andrew K
Video Edited:
Patrick B
Video Edited:
Chad S
Installed by:
Nicholas E
Updated by:
Brian T

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