1. Trailer Lights
  2. Optronics
  3. Clearance Lights
  4. Rectangle
  5. LED Light
  6. Red
Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 4 Diodes - Red Lens

Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 4 Diodes - Red Lens

Item # MCL75RB
lowest price pledge
Our Price: $8.23
Trailer Lights
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.07 lbs
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

3-15/16" x 1-1/4". Waterproof, LED trailer light serves as either a side marker light or clearance light. Durable polycarbonate housing and lens. Multiple mounting options. Accepts standard 1-prong or 2-prong plugs. P2 rated. Lowest Prices for the best trailer lights from Optronics. Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 4 Diodes - Red Lens part number MCL75RB can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (1855)
  • Q & A (15)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - MCL75RB

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

3-15/16" x 1-1/4". Waterproof, LED trailer light serves as either a side marker light or clearance light. Durable polycarbonate housing and lens. Multiple mounting options. Accepts standard 1-prong or 2-prong plugs. 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
  • Red lens over white LEDs
  • Compatible with 12V DC systems
  • Multiple mounting options
    • Surface mount with open-back or self-grounding bracket (sold separately)
  • Accepts industry standard 1-prong and 2-prong plugs
  • P2 rated


  • Dimensions: 3-15/16" long x 1-1/4" tall x 7/8" deep
  • Mounting holes: 3" apart on center
  • 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 # 19250R
Grote # 47492

Optronics Thinline MCL75 Series Red LED Marker Clearance 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.

MCL75RB Optronics Thinline LED Clearance or Side Marker Trailer Light - Submersible - 4 Diodes - Rectangle - Red Lens - P2 Rated

Alternate part number: MCL-75RB

California residents: click here

Customer Reviews

Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 4 Diodes - Red Lens - MCL75RB

Average Customer Rating:  4.9 out of 5 stars   (1855 Customer Reviews)

3-15/16" x 1-1/4". Waterproof, LED trailer light serves as either a side marker light or clearance light. Durable polycarbonate housing and lens. Multiple mounting options. Accepts standard 1-prong or 2-prong plugs. P2 rated.


Nice lights works great 937521


The product was a perfect fit and was delivered earlier than promised. 935378



by: 09/21/2020

works well, easy to install, 884621


As always, amazing level of service and communication, second to none. The product arrived very quickly (shipped to Canada as well), in excellent condition and exactly as pictured. It was a simple and perfect replacement for the defective ones on my horse trailer! 870184


easy web site to browse. Prices are good and timely delivery The web site let me look at the items from different angles which let me confirm that the product was what I needed. 868716


just what I ordered 817670


Direct replacement for the lights on my Haulmark enclosed car trailer. MUCH brighter than the stock incandescent. 804629


Great replacement and update for my 2005 Haulmark Edge. 800914


Still new looking held up great 1 year later 803139


Lights still work Cannot beat the price. 796117


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. 794392


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! 791565


Easy way to switch over to LED. Same ba se. 783616


Better than original! 775257


I replaced a broken light on my horse trailer. it is working well 769811


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. 758632


Website is definitely user friendly. The process of finding the correct part from beginning to end is easy and stress free. 696907


Great lights. Look good, easy to insta ll. 692709


Replacement trailer marker lights seem to be good. Don't know for sure as we only use the trailer occasionally. 691599


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 682931


Nice sealed led slimline light. 677707


Poor/incomplete product description. These are obviously replacement lamps for some type of fixture. These are not meant to stand alone with wire pigtails that you can use to replace existing trailer lights. I'll have to return these now. 672633

As mentioned in the product description above, the lamps are mounted using the pigtails and surface or grommet mounts which are sold separately. These items arent included because the mount and pigtail needed will depend on how youre mounting the lamp.
-- Mike L - 07/22/2019



These are tons better than the 9 year old leds I had. 671526


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. 671109

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • 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 LED Clearance Lights for 2000 Sundowner Trailer
    The Sealed, Thin Line LED Trailer Clearance, Side Marker Light, 4 Diode - Red # MCL75RB will mount to your 2000 Sundowner as long as the base it connects to is 4-1/16" L x 1-1/16" W x 1/2" D. If you need to replace that bracket, I recommend the Black Bracket and Single Wire Plug for Thin Line Series Trailer Clearance and Side Marker Lights # A65PB or chrome # A67CB. We don't have a spec sheet of each trailer, but you can definitely make these work and the dimensions should help you...
    view full answer...
  • Can I Use Optronics LED Light # MCL75RB in the Same Base as Light # MC65RB
    Yes, both the Optronics lights # MC65RB and MCL75RB use the same mounting base, so the # MCL75RB lights will snap into your old bases. You will then need to wire in the lights, with a power and ground connection. Part # MCL75RB is a sealed LED light light and will burn brighter but draw less power than part # MC65RB. Both lights use either base # A65PB or # A67CB. See the video that I shot showing both lights.
    view full answer...
  • How Does the Optronics Clearance Light # MCL75RB Mount to a Trailer
    For a mounting bracket for the Optronics Trailer Light # MCL75RB that you referenced you would want an Optronics Black Mounting Bracket # A65PB. How it will mount will depend on your trailer, but basically you will need to use a screw or bolt with a diameter less than 1/4 inches to attach it to the surface of your trailer. The mounting holes are 3 inches apart on center. Grounding the light circuit through the mounting bracket should not cause a short circuit. Just make sure the metal...
    view full answer...
  • Diameter Fasteners to Use to Install Clearance Light MCL75RB
    The mounting hole diameters of the install bracket # A65PB for the Thinline light part # MCL75RB are 3/16 inch in diameter. 1/8 inch diameter screws or rivets would work well. Aluminum isn't going to be as strong as steel but if the light assembly is pretty lightweight so it would still be held on securely with a aluminum screws or rivets.
    view full answer...
  • What Brackets Are Used To Mount The Sealed, Thin Line LED Trailer Clearance Light Part # MCL75RB
    The correct mounting bracket for the Sealed, Thin Line LED Trailer Clearance part # MCL75RB is the Single Wire Plug for Thin Line Series Trailer Clearance and Side Marker Lights part # A65PB for black and part # A67CB for chrome.
    view full answer...
  • How Does the Optronics Light # MCL75RB Install on a Two Wire Lighting System
    When installing the Optronics Sealed, Thin Line LED Light, # MCL75RB, you will use the # A65PB Bracket for Single Wire Thin Line Light. The bracket has a black wire that the power wire on your trailer will connect. The light will ground to the trailer through the light bracket. If you are mounting to a steel frame then you will not need to install the trailers ground wire.
    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...
  • Height of the Thin Line LED Trailer Clearance Light # MCL75RB When Installed in Mounting Bracket
    The Thin Line LED Trailer Clearance Light # MCL75RB is 7/8 inch deep and the install bracket part # A65B would add 1/4 inch of depth to the overall height of the light setup. That means that overall it would 1-1/8 inches tall.
    view full answer...
  • Lights for a 7 Foot x 10 Foot Cargo Trailer
    It is imperative you check your local laws for lighting requirements in regards to your specific trailer, though I can tell you you no matter what you'll need stop lights, tail lights, turn signals and reflectors. There are other factors, including your trailer's GVWR that you need to take into consideration; I have added a link to a help article on trailer lighting requirements which I highly recommend checking out. That said, a 7' wide x 10' long cargo trailer is almost certain to...
    view full answer...
  • Trailer Clearance Light Replacement
    Those part numbers are for trailer clearance lights, and the main difference between 1a-v-1240R and 1a-v-1260r is that the 1240R is a led light, and the 1260r is a incandescent light. Both lights have red lenses and are 3 7/8 inches long, by 1 1/4 inch wide. We do have replacement lights that will work in both styles. For an led red marker light you can use Optronics Thinline LED Trailer Clearance or Side Marker Light # MCL75RB. For an incandescent light use Optronics Incandescent...
    view full answer...
  • Base Recommendation for the LED Clearance Light MCL75RB
    The black base that the part # MCL75RB attaches to is part # A65PB.
    view full answer...
  • Which is Brighter? The Optronics Light # MCL65RB or # MCL75RB
    The Optronics Trailer Lights # MCL75RB would be brighter than the Optronics Trailer Lights # MCL65RB as it has 4 LEDs and the # MCL65RB only has 3. The # MCL75RB actually draws 0.06 amps at 12.8 volts. Check out the review videos I attached for each light.
    view full answer...
  • Replacing Optronics Thin Line Incandescent Trailer Light with Thin Line LED Trailer Light
    You are exactly right. Changing out your # MC65RB incandescent lights for new # MCL75RB lights will simply require removing the existing light and snapping a new light into the same housing. Both of these lights use the # A65PB bracket. If any of the brackets on your trailer need replaced you can use the # A65PB as a replacement, but the LED lights will not require any different base than the incandescent lights. I have attached an installation video of the # MCL75RB light for you.
    view full answer...
  • Does Optronics Side Marker Light # MCL63RB have to be Mounted a Specific Way
    Lights that have to be mounted in a specific orientation will have TOP printed on them somewhere which I do not see on light # MCL63RB. The lens is designed to direct the light straight outward so that is likely why it is harder to see them if they are mounted high and you are close to the trailer. A lens design like that found on # MCL75RB would be a little easier to see at steeper angles. I have included a help article on trailer lighting requirements for you.
    view full answer...

  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality trailer lights for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer light information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

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

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.

Product Experts Available Now!
Call 800-298-8924