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Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 3 Diodes - Amber Lens
Optronics

Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 3 Diodes - Amber Lens

Part Number: MCL65AB
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$11.38
Retail:$19.32
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In Use/Installed

3-15/16" x 1-1/4" Rectangle. Waterproof, LED trailer light serves as either a clearance or side marker light. Durable polycarbonate housing and lens. Surface mount to trailer. Accepts standard 1-prong or 2-prong plugs. P2 rated. Great Prices for the best trailer lights from Optronics. Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 3 Diodes - Amber Lens part number MCL65AB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - MCL65AB

Highlights

  • Reliable In Any Weather: Sonically sealed, waterproof housing keeps water out for lasting performance.
  • Slim Fit Anywhere: Thinline 3-15/16" x 1-1/4" design fits tight trailer spots.
  • Fewer Replacements Needed: LEDs last 50 times longer and draw only 0.048 amps at 12.8V.
  • Simple Power Hookup: Accepts standard 1-prong or 2-prong plugs for easy wiring.
  • Dual Purpose Light: Works as a clearance or side marker light when properly mounted.
  • Road Legal: DOT compliant and P2 rated for safe, visible trailer lighting.

Features to know about

Brighter, Longer-Lasting Lighting: 3-Diode LED Performance

Old incandescent bulbs fade fast, but this thinline light keeps shining. Its three white LEDs shine through an amber lens for efficient, long-life operation that’s up to 50 times longer than traditional bulbs. With only a 0.048-amp draw at 12.8V, it’s bright and dependable while keeping power demands low. No filaments to break, no bulbs to replace—just consistent illumination every time you tow.

Confident in the Rain or Water: Sonically Sealed and Submersible Design

Water intrusion can ruin a light fast, but not this one. The polycarbonate housing and lens are sonically sealed into one waterproof unit that’s fully submersible. Whether your trailer is exposed to heavy rain or goes beneath the surface at the ramp, the diodes and wiring stay dry and protected. It’s built for reliability in wet or harsh conditions.

Fits Where Others Don’t: Slim Thinline Profile

Tight mounting spots don’t mean you have to compromise on lighting. Measuring just 3-15/16" long, 1-1/4" wide, and 7/8" thick, this low-profile thinline series light tucks neatly along surfaces without sticking out. It surface mounts with a bracket (A65B – sold separately) and accepts standard 1-prong or 2-prong plugs for quick hookups.

Meets Safety Standards: DOT Compliant P2 Rating

For dependable performance you can trust on the road, this light is DOT compliant and P2 rated. Its beam projects at a 45-degree angle on each side of centerline, covering a total of 90 degrees—ideal for use as either a clearance or side marker light when properly mounted. That means it meets visibility requirements where it matters most.

Durable Build That Stays Strong: Polycarbonate Housing and Lens

Every part of this light is made to handle real-world use. The tough polycarbonate housing resists impact, cracks, and wear from UV exposure. The amber lens stays clear and bright over time, ensuring your trailer lights remain visible trip after trip without fading or fogging.

Specs

Dimensions

  • Length: 3-15/16"
  • Width: 1-1/4"
  • Thickness: 7/8"

Dimensional diagram of Optronics MCL65AB Thinline amber LED trailer clearance and side marker light showing length, width, and thickness measurements.

Electrical

  • Power draw at 12.8V: 0.048 amps
  • Voltage: 12V DC electrical systems

Lighting

  • Diodes: 3
  • Lens color: Amber
  • LED color: White
  • Function: Clearance light or side marker (when properly mounted)
  • Rating: P2 rated

Construction

  • Shape: Rectangle
  • Mount type: Surface mount
  • Housing and lens material: Polycarbonate
  • Waterproof: Yes (sonically sealed, submersible unit)

Compatibility

  • Plug type: Accepts standard 1-prong or 2-prong plugs
  • Bracket compatibility: A65B (sold separately)

Compliance

  • DOT compliant: Yes

Warranty

  • LEDs: Lifetime warranty

Manufacturer Cross Reference

  • Uni Bond #: LED1040-6A
  • Truck Lite #: 19250Y
  • Grote #: 47093
  • Peterson #: M161A
  • Maxxima #: M20350Y

MCL65AB Optronics Thinline 12V LED Trailer Clearance or Side Marker Light - Submersible - 3 Diodes - Rectangle - Amber Lens - P2 Rated

Alternate part number: MCL-65AB





Customer Satisfaction Score:

Ratings & Reviews

4.8

2627 reviews
5 Stars
(2356)
4 Stars
(188)
3 Stars
(38)
2 Stars
(18)
1 Star
(27)
Review sort icon
3-15/16" x 1-1/4" Rectangle. Waterproof, LED trailer light serves as either a clearance or side marker light. Durable polycarbonate housing and lens. Surface mount to trailer. Accepts standard 1-prong or 2-prong plugs. P2 rated.

by:

Replaces OEM perfectly. Good



by:

First of all, the part I needed was in stock and was shipped promptly. When I received it, it was easy to install and it worked perfectly! Crossed off my to-do list!



by:

Quality product, still working great to this day. They have endured some unfavorable conditions along the way.



by:

Second order from this company. Once again, great service, fast delivery and a
quality product.



by:

These lights are the best because change out is soooo easy and the initial ones lasted 9 years. They are removed with a small flat head screw driver and you snap in the new one. Great product



by:

The CSR Terri was awesome!
I will continue
to utilize this site for all my trailer needs.



by:

My old lights had faded badly and the new ones are bright and clear. Improved the look of my enclosed car hauler.



by:

The lights and bases were exactly what we were looking for to convert from the old style to the new snap-in type.



by:

Product was exactly as stated on their website and delivery time was great. No complaints at all.

Davis profile picture

Davis

1/17/2018

Thank you for the follow up. They are still working like a champ. I will definitely reach out to your company when I need something in the future.



by:

Mounted these on my boat trailer and these are bright and easy to mount with the A65PB bracket. Have not submersed them yet so I can not comment on how well sealed the LEDs are. Ordered on a Saturday evening, received on the following Wednesday.



by:

These have been on my box trailer for 1 year now. Still working great. For the price these can’t be beat. I will buy again when needed. Very good product. And a great company to deal with.



by:

Great replacement for old faded bulb style lights.



by:

Mounted amber and red light on the side marker on our trailer
Big improvement over the old bulb style.



by:

I like dealing with etrailer corporation. You get exactly what you ordered. It arrives quickly. And I’ve never found anything that didn’t work out exactly what way is they said it would



by:

Excellent product. If buying for the first time don’t forget to buy the mounting bracket!



by:

Profesional and friendly customer service. I had a great experience ordering from etrailer.



by:

My order came quickly and was complete. Lights installed quickly.

David profile picture

David

10/2/2021

No more blown fuses. Quick and easy to install. Brighter than the original. I am extremely happy with them!



by:

The led trailer clearance lights were a perfect replacement. They just snapped into place.



by:

Ordered new LED marker lights for my trailer, they were exact fit & work great. Would buy from etrailer again in a heartbeat.



by:

Great products and fast delivery



by:

Needed to get trailer inspected. I have a hard time sometimes finding these light assemblies in my local area. Had to replace one assembly and base as ground contact was corroded away. Order arrived as promised and trailer is ready to go now. Thinking about ordering connection box and trailer cable assembly to make connections easier. Wires on trailers do not always match standard wiring colors. Need to label connections box with functions as colors do not always match.



by:

Quality product!
The LEDs light up brightly.
They're brighter than i expected! I bought enough to change out all my trailer lights, it worked out well. So far they've been through some extreme weather. I've used the trailer in heavy rain, high heat, through winter and freezing temps, and many washes. They haven't leaked and lenses still look great. It's only been a year and I'm hoping these will last many many more.



by:

Hard to find replacement lights. Amazing communication and fast shipping highly recommend



by:

The replacement lights that I ordered for my Haulmark trailer were an exact fit. Your website is easy to use and your service in delivery is quick! I will continue to use etrailer.com for future needs as they arise.

John52 profile picture

John52

6/13/2020

After one year, the replacement parts have performed perfectly. The LED clearance lights and tail lights are bright which is definitely an added safety feature on the highways and around town. Great product, easy to use website and quick response to deliver purchased products.



by:

I have a 2006 Brenderup Horse Trailer. My side markers were destroyed by the sun and intermittently working. I found what I thought would be an exact match on etrailer after looking high and low on the internet everywhere else. Normally I'd get an out of stock message. etrailer's model 19 lamps worked perfectly. Best thing was I did not have to buy and replace the base (also hard to find online). I just had to snap the old ones out and snap these in. Now our trailer and horses are as safe as can be, barring unsafe and stupid drivers on the road, who seem to be unsafe and stupid no matter whether or not my lights are working. LOL. Just sayin.

Brooke M. profile picture
Etrailer Expert

Brooke M.

4/14/2025

Unsafe and stupid drivers is putting it nicely, if you ask me! I'd love to see a photo of your horse trailer [maybe with a horse in it too?] if you ever feel like sending one in ;)


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See what our Experts say about this Optronics Trailer Lights

  • Replacement Clearance Lights for 2007 Featherlite Trailer 8127
    Hey Melissa, thanks for reaching out! It looks like you have the Optronics Thinline lights on your Featherlite trailer so you'll need the following: Red - 2" # AL91RB - 4" # MCL75RB Amber - 2" # AL91AB - 4" # MCL65AB Which ones are you needing the whole assembly for?
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  • Recommended Clearance Lights for Pace America Trailer
    I recommend going with the Thin Line LED Trailer Light, # MCL65AB for amber lights and # MCL65RB for red lights. These sealed, dual-bulb lights can be used as a clearance or side marker lights. I have included a link to a video review and installation video of these lights for you. To mount the light, you will also need a bracket like # A65PB for black or # A67CB for chrome.
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  • Replacement LED Trailer Lights for Kaper KII Lights for a 2009 Haulmark Trailer
    The lights that you have referenced, # STL70RB, do have the same measurements as the Kaper lights you have with the exception that they do not stick out as far from the trailer. As for the clearance lights I do not have one that is an exact match for the dimensions you have given. A close match is # MCL65AB. It measures 3-15/16 inches long and 1-1/4 inches wide. To mount it you would need a bracket like # A65PB or # A67CB.
    view full answer...
  • Recommended Amber Clearance Light That Measures 4L x 1W and Has 2-Wires for Connection
    If you are looking for an amber clearance light, then I recommend going with the Peterson Piranha Trailer Clearance Light, part # 169A. This light measures 4-1/16 inches L x 1-1/16 inches W and comes with the black and white wiring that you are looking for. It is very similar to the Optronics # MCL65AB that you referenced in your question. You can cut off the ring terminal end of the white wire and use some Butt Connectors, like part # 05731-5, to attach your power and ground wires to...
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  • Replacement base for Fender Mounted Clearance Lights on a 2000 Shorelandr Trailer
    It sounds like you have fender mounted lights on something like A67CVB, which is gray (white isn't available). A white base is not available for light # MCL65AB. Since you are not sure if this is the correct replacement light check the lights you have now for a part number (not on the lens, on the actual housing of the light). If they are M161A then Optronics light # MCL65AB is a correct replacement.
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  • Mounting Brackets for Sealed, Thin Line LED Trailer Clearance, Side Marker Light MCL65AB
    There are a few options for brackets for trailer light # MCL65AB. None are beige or tan but we do have black, # A65PB. Chrome, # A67CB. You will need to remove the old brackets and use steel hardware to install these new brackets. The light will ground through the mounting hardware so they have to be screwed into steel.
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  • Clearance and Side Marker Light with Turn Signal Function
    If I am understanding you correctly you are wanting a side marker light like the Optronics Thinline LED Trailer Clearance or Side Marker Light - Submersible - 3 Diodes - Amber Lens item # MCL65AB to be used as a turn signal. I have a solution for you but this light can not be used for that purpose. You will want the Peterson Piranha LED Clearance and Side Marker Trailer Light w/ Turn Signal - 6 Diodes - Amber Lens item # M353A. The LED trailer light functions as a clearance and side marker...
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  • Upgrading Optronics Thinline 65 Series Clearance and Side Marker Lights To LED
    The Optronics Thinline LED Trailer Clearance or Side Marker Light # MCL65RB will fit the same Mounting Bracket # A65PB as the Optronics Incandescent Trailer Clearance and Side Marker Light # MC65RB. The only difference is the LED versus the incandescent lights. The Optronics Thinline LED Trailer Clearance or Side Marker Light # MCL65AB is also available in a amber lens if you also have them going down the sides of your band trailer.
    view full answer...
  • Trailer Wiring Amperage for 1995 Ford F-250/350
    You can ground the brakes right by the frame as long as the frame is a good electrical ground. The closer the ground is to the brake assembly the better. I do not know what the maximum amperage is for the running light circuit on your truck. But it would take quite a bit to over load the circuit. There are a lot of LED lights now available for trailers that draw very few amps. For example, one of the Optronics LED lights we carry draws .048 amps where as an incandescent may draw 4 or 5...
    view full answer...
  • Is Sealed, Thin Line Two-Bulb Trailer Clearance, Side Marker Light Available as an LED
    Yes, there is an LED version. You will need the Thin Line LED Trailer Light, # MCL65AB. I have included a link to a video review of this light for you. To mount the light, you will also need a bracket like # A65PB for black or # A67CB for chrome.
    view full answer...


Info for this part was:

Employee Michael H
Expert Research:
Michael H
Employee Jacob T
Video Edited:
Jacob T
Employee Laura H
Updated by:
Laura H
Employee Brian T
Updated by:
Brian T
Employee Cole B
Installed by:
Cole B

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