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Optronics Clearance and Side Marker Trailer Light - Submersible - Incandescent - Round - Red Lens

Optronics Clearance and Side Marker Trailer Light - Submersible - Incandescent - Round - Red Lens

Item # MC55RB
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Optronics Clearance Lights - MC55RB
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2-1/2" Diameter round. Waterproof, incandescent trailer light functions as a clearance and side marker light when properly mounted. Durable polycarbonate housing and lens. Multiple mounting options. Accepts standard 2-prong plug. PC rated. Great Prices for the best trailer lights from Optronics. Optronics Clearance and Side Marker Trailer Light - Submersible - Incandescent - Round - Red Lens part number MC55RB can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (43)
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Optronics Trailer Lights - MC55RB

  • Clearance Lights
  • Round
  • Incandescent Light
  • Red
  • 2-1/2 Inch Diameter
  • Recessed Mount
  • Rear Clearance
  • Side Marker
  • Submersible Lights
  • Optronics

2-1/2" Diameter round. Waterproof, incandescent trailer light functions as a clearance and side marker light when properly mounted. Durable polycarbonate housing and lens. Multiple mounting options. Accepts standard 2-prong plug. PC rated.


  • Incandescent trailer light functions as a clearance and side marker light when properly mounted
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Incandescent bulb can be easily replaced
  • Durable ABS housing with snap-on lens
  • Red lens over incandescent bulb
  • Compatible with 12V DC systems
  • Recessed mount with grommet (A55GB or A56GB - sold separately)
    • Surface mount with cam-on mounting bracket (BK5557GB - sold separately)
  • Accepts industry standard 2-prong plug (A46PB or A86PB - sold separately)
  • PC rated


  • Dimensions: 2-1/2" diameter x 11/16" thick
  • Bulb type: incandescent
  • Power draw at 12.8V: 0.2 amps
  • 3-Year warranty

Manufacturer Cross Reference
Light will work as an exact replacement for:
Uni Bond # SE2500R
Truck Lite # 10202R
Grote # 45812
Peterson # 142R
Bargman # 40-31-001

Optronics MC55 Series 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.

PC-Rated Lights

Diagram of light spread for PC rated light

A PC-rated light produces a 90-degree angle of light to either side of its centerline for a total of 180 degrees of coverage. This beam pattern can be clearly seen when you are standing directly in front of the light, as well as when you are standing on either side of the light. When properly installed, this type of light can function as both a front clearance light and a side marker light or as a rear clearance light and side marker light.

MC55RB Optronics Clearance and Side Marker Trailer Light - Submersible - Incandescent - Round - Red Lens - PC Rated

Alternate part number: MC-55RB

California residents: click here

Video of Optronics Clearance and Side Marker Trailer Light - Submersible - Incandescent - Round - Red Lens

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

Video Transcript for Optronics Clearance and Side Marker Trailer Light Review and Installation

Hi there, safety conscious haulers. Today we're going to be taking a look at Optronics' submersible incandescent side marker lights. These are available in either amber or red depending on where you need them installed in your trailer. Just remember that amber is for the front and red's for the rear. This light will make a great replacement light. So if your trailer already has incandescent lights and you've just got some damaged lights and you want to replace those, this will make a great drop in replacement so that way everything's going to remain incandescent.

It's a standard two and a half inch size. So it'll poke right in where your old lights used to go. Go on ahead and turn the lights off so you can see that it is an amber lens and the bulb inside is just your typical incandescent bulb. The entire assembly is going to be sonically sealed. So it's completely waterproof and submersible.This is going to be great if you're planning on putting this on a trailer that typically sees a lot of inclement weather or maybe a boat trailer where you back it down to load and unload your boat and the lights get submerged under the water.

The only drawback here is that it is an incandescent bulb. But since it's sonically sealed, the bolt inside is not going to be replaceable. So if it does burn out, you just have to replace the entire assembly. That being said, if you are not bent on keeping all incandescents on your trailer, I would highly recommend that you upgrade to LED bulbs as they last about 50 times longer than your typical incandescents. I've got an LED version of this light installed here on our fender and you can see here that it is much brighter than the single incandescent bolt.

It's also going to draw less current.So if you wanted to add more lights to your trailer but you didn't want to increase how much current you we're drawing and upgrade those parts, you could easily add these in and still likely stay less of a current draw than what you had before with your incandescent lights. We're here back at our red incandescent light that we installed and it does share all the same features and right on the backside of this we have the LED version installed so you can see the difference in illumination. Both the amber and red side marker lights are going to be inaudible 00:01:58 rated, which means they are specifically designed for side marker lights and there'll be DOT compliant in all states as long as you install them in the correct locations. We can see our old light here and this is why we're going to be replacing it. This old one here is damaged.

Our new light is going to make a great replacement or upgrade if you've got incandescent bulbs and you're just wanting to get those out of there for something more modern, that's more efficient and maintenance free that will last longer.When you're wanting to replace it, you'll want to first remove your old light. If you can reach in the backside, pushing it out from the back's usually the easiest way. If not, you can use a screwdriver to work it out of the grommet. We can then disconnect our electrical connector on the back side. This is just a standard two prong wire. So we're going to disconnect that. If your bulb what was hardwired, you would need to cut the wires to remove it. Now this connector is going to be necessary to install our new lights. So if you do not have this connector on your trailer, you'd want to pick one of these connectors up here at so you can quickly connect your new light. We can then clean out any dirt that's inside of our grommet there just to make it easier to get our new light in. A lot of times, the easiest way to do that's just to pop the grommet out, knock the dirt out, then put it back in.If your grommet is damaged and you need a new one, we have some available here at which you can purchase along with your lights. We're now ready to take our new light and we're going to plug it into our connector. The standard two-prong connector just simply plugs right in. You will notice that your new light is prepacked with dielectric grease. So you don't really need to add any. But you can add some if you want. If you need some dielectric grease, we have some available here at The light simply just presses right on and then we can press it into our grommet. We're now ready to test it out. So you can either plug your trailer into the back of your truck or hook up a tester and verify that it's working properly. Everything's working fine here. So if you have more lights that you want to install, you can go ahead and de-power it now and then go ahead and perform the exact same procedures to replace any other lights you're replacing and that completes our look at Optronics' submersible incandescent side marker lights.

Customer Satisfaction Score:

Customer Reviews

Optronics Clearance and Side Marker Trailer Light - Submersible - Incandescent - Round - Red Lens - MC55RB

Average Customer Rating:  4.8 out of 5 stars   (43 Customer Reviews)

2-1/2" Diameter round. Waterproof, incandescent trailer light functions as a clearance and side marker light when properly mounted. Durable polycarbonate housing and lens. Multiple mounting options. Accepts standard 2-prong plug. PC rated.


The right part for my motorhome.


Direct replacement for failed lamp. Brighter than original.


Couldn't be more happy with the service


E trailer did a fantastic job.
order: Technical support / help was excellent.
Goal, conversion of a 1998 Floe snowmobile trailer from surge to electric brakes.
Problem, due to time and corrosion, I could only supply partial part numbers, spindle diameter.
etrailer did a fantastic job, researching, and getting me the correct part numbers, so I could order.
Julie did a great job.
She was very timely, communicated clearly and honestly, and just “kept me in the loop”.

I received the order came on the projected date, complete and undamaged. Excellent.
I would highly recommend etrailer, for your part needs.




hitch parts ordered very nice part, lights same , very good price.always use because of price and service its the best


My original trailer light was broken due to my fault I ordered a new replacement and the new light was a prefect fit and is working just like the original . Would definitely purchase again !!


Excellent replacement for my trailer. Fit well, priced right, and fast shipping


Exactly what I needed. The websites showed me the breakdown of the part (exact size measurements) and I was able to order the correct replacements that I needed. Shipping was also very fast.


Great product, Great company. I will buy no where else when it comes to keeping my trailers up!


Great product and extremely fast shipping. I have ordered from Etrailer 2 times now and am very satisfied!


Still kicking!




Just what I needed. Perfect replacement. Great service and the website made ordering easy.


Good quality. etrailer you can't go wr ong.


All items ordered were in the box to do the needed repairs -
I can't wait to get started - Parts look good - Thanks


Excellent seller....and quick to send order. Exceptional to do business with...Thanks!!!


Just as described, nice and bright.

Good quality and good price
Kevin - 04/25/2020


Outstanding customer support. Products are high quality.


Woorks great. Found out I also needed the 2 inch size too.

I recommend part # MC53RB
Optronics Trailer Clearance and Side Marker Light - Submersible - Incandescent - Round - Red Lens
. It is the 2 inch version of this light part # MC55RB.
-- Etrailer Expert Heather A - 11/15/2018


Easy install and works as it should.


I got exactly what I ordered and the description was exactly what it was. Shipped right away that day with plenty of updates along the way. Great company.


Service and delivery was as scheduled. Have installed the part and it works as intended.


Those lights were not the right ones for my camper.


Exactly what I was looking. Right price and timely delivered

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • 1990 Big Foot Slide Truck Camper Replacement Red and Amber Clearance Lights
    The red light part # MC55RB would be a 2-1/2 inch diameter light that would work well for the red lights you need to replace. For the amber version you would want the # MC55AB. The grommet needed is the part # A55GB. For a pigtail harness you would want the part # A46PB. This comes with a ground and power wire. You would need to route the white wire to a ground wire since your trailer is made of fiberglass. The black wire is the power wire. The grommet requires a 3 inch hole to be drilled...
    view full answer...
  • Wiring Pigtail Recommendation for a Trailer Clearance Light MC55RB
    The Trailer Light part # MC55RB that you referenced uses the connector part # A46PB as a pig tail harness. You would just plug the harness into the light and then run the power to the black wire and the ground to the white wire and you would be good to go.
    view full answer...
  • Can a 2-1/2 Inch Round Surface Mount Trailer Light be Mounted Using a Grommet Instead
    Technically you could use grommet # A57GB with trailer light # MC58RB. However the light was meant to be attached to a flat surface. The recessed mount version is # MC55RB and you would use grommet # A55GB. This set up actually costs a little less though the light requires pigtail # A46PB.
    view full answer...
  • Replacement 2-1/2 Inch Round Marker Light on Triton Trailers Elite WCII Personal Watercraft Trailer
    I do not have a cross reference chart for Truck-Lite trailer lights, but we have several 2-1/2 inch round clearance lights that may work for you. I have attached a link that will take you to all of our 2 inch and 2-1/2 inch round trailer lights for you to check out. I have also linked a few LED and incandescent 2-1/2 inch round clearance lights for you to checkout below. The biggest difference between many of these lights is the depth of the lens. Most of the lights are either 11/16 inches...
    view full answer...
  • Replacement Boat Trailer Lights for 2-3/4" Rough Cutout and 2-1/4" Grommet
    I have a solution for you, but we do not have any replacement lights that will fit in those grommets. Instead, you can use the LED Clearance or Side Marker Light # MCL002AXB (amber) and # MCL002RXB, which require a rough cutout dimension of 2-3/4", so they'll fit in your existing holes and provide you with the light solution you're looking for. These are waterproof LED lights so they're the perfect solution for a boat trailer as long as the rest of your lights are already LED. If your...
    view full answer...

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Info for this part was:

Employee Patrick B
Video Edited:
Patrick B
Employee Dustin K
Video Edited:
Dustin K
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Brian T
Updated by:
Brian T
Employee Cole B
Installed by:
Cole B
Employee David F
Installed by:
David F

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