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Thinline LED Clearance and Side Marker Light - Submersible - 3 Diodes - Rectangle - Red

Thinline LED Clearance and Side Marker Light - Submersible - 3 Diodes - Rectangle - Red

Item # AL91RB
Our Price: $4.57
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Trailer Lights
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Optronics LED Light Trailer Lights - AL91RB
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2-1/2" x 1-3/16" Rectangle. Waterproof trailer light functions as both a clearance light and a side marker light when properly mounted. Requires mounting bracket and plug (both sold separately) for installation. Red lens. PC rated. Great Prices for the best trailer lights from Optronics. Thinline LED Clearance and Side Marker Light - Submersible - 3 Diodes - Rectangle - Red part number AL91RB can be ordered online at or call 1-800-496-5010 for expert service.
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  • Reviews (1378)
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  • Why etrailer?

Optronics Trailer Lights - AL91RB

  • Clearance Lights
  • Rectangle
  • LED Light
  • Red
  • 2-1/2L x 1W Inch
  • Surface Mount
  • Rear Clearance
  • Side Marker
  • Submersible Lights
  • Optronics

2-1/2" x 1-3/16" Rectangle. Waterproof trailer light functions as both a clearance light and a side marker light when properly mounted. Requires mounting bracket and plug (both sold separately) for installation. Red lens. PC rated.


  • Small, rectangular trailer light functions as both a clearance light and a side marker light 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
  • Polycarbonate lens and housing
  • Red lens
  • Multiple mounting options
    • Surface mount with open-back or self-grounding bracket (sold separately)
    • Recessed mount with grommet (sold separately)
  • Accepts industry-standard 2-prong plug (sold separately)
    • Requires single-prong plug (sold separately) for installation with self-grounding bracket
  • DOT compliant
  • PC rated


  • Dimensions: 2-1/2" long x 1-3/16" wide x 7/8" deep
  • Diodes: 3
  • Power draw at 12.8 volts: 0.051 amps
  • Lifetime warranty on LEDs

Optronics light dimensions

Trailer light is a direct replacement for:

  • Uni Bond LED1225-3R
  • Truck Lite 15250R
  • Grote 47082
  • Peterson M153R
  • Maxxima M20320R
  • Wesbar/Bargman 40-37-002

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 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 a side marker light.

AL91RB Optronics Thin Line Mini LED Side Marker/Clearance Trailer Taillight - PC Rated - Red

Alternate part number: AL-91RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Thinline LED Clearance and Side Marker Light - Submersible - 3 Diodes - Rectangle - Red - AL91RB

Average Customer Rating:  4.9 out of 5 stars   (1378 Customer Reviews)

2-1/2" x 1-3/16" Rectangle. Waterproof trailer light functions as both a clearance light and a side marker light when properly mounted. Requires mounting bracket and plug (both sold separately) for installation. Red lens. PC rated.


Install them on my trailer they were replacements for the old ones that did not work ,nice and bright three diode‘s

Very good on my boat trailer, salt water is so crossive but so far so good.
Ron - 11/09/2022


These Thinline led lights replaced my incandescent ones perfectly as id lights for my boat trailerl. etrailer has great pricing and the item was in stock. These are brighter than oem and should outlive the original lights. This decision was made easily to upgrade to these. Friends of mine as well as myself have made purchases from etrailer before and have been very satisfied with our purchase. Customer service is good. No reason to look anywhere else.


Once these work they are great but some more quality control could really be used. I bought two of these and one of them had an issue with the pigtail connection on the back, it was too small to accept the pigtail. Some modification had to be made to get it to work plus some more dielectric grease. We will see how long this one light works. They are bright and they are exact replacements for the existing lights on my EZ Loader boat trailer.


The initial shipment had the wrong light fixture but etrailer was very quick and helpful in getting the problem rectified, and expeditiously sent the correct light fixture to me. Thanks etrailer staff!


Doesn't fit. Want to return but etrailer wants to charge me $XX.00 to ship back an item that weighs less and one lb and ships in a paper envelope. No thanks. Next time I'll just use [online]. So much for my attempt to support a smaller business.

You are not required to use the label that we send to return the lights. You can use any method that you find that is less expensive. We just ask that you print out the paper work and include it with your return. It is best to use a method that is traceable.
-- Etrailer Expert Jenny N - 03/04/2022


Fits but making adjustments now to retrofit onto the truck fender.


As usual, I diagnosed the problem and ordered the parts as needed. As promised, needed parts arrived as scheduled and boat trailer lights fixed in time for my fishing trip.


Perfect fit! I was extremely worried that I would have to endure a lot of modification due to the age of my trailer, but found exact replacement parts.


Great OEM replacement parts and great prices. Easy to order and fast shipping!! I have already referred friends.


Deeper, richer color, lower current draw, long lasting. Easy to install.


Great replacement light, easy order process, and reasonale shipping time.


Excellent product couldn’t find this anywhere with plug in wires exactly what I needed for my boat trailer.


I'm very pleased with these LED replacement lights for the fenders on my cargo trailer.
Before these I had the regular light bulb which I had to replace from time to time. So the last time I needed to replace a bulb about a year ago I decided to go with these LEDs.
Wow what a difference in their brightness.
Before changing to LEDs my lights on the fenders were somewhat dim. Now with the LEDs these lights are bright enough for other divers to see them in the daylight giving me some peace of mind that they see me coming.
There is however one con to them being so bright.
When I have to back my trailer into the driveway at night their brightness blinds me from seeing my wife in back of the trailer guiding me in when using my review mirrors.
But it's OK because now I will just get some LED backup lights for the trailer.
I plan on changing the entire trailer over to LED lights, someday. lol
PS. I love

Still loving them
Scott F - 02/26/2021


Exactly as advertised!


Great service


Products arrived on time and in perfect condition. I really liked the personal email communication regarding the order progress and tracking.


Installed these lights on my extend a truck, they work perfect, small and bright and you can see them from the side as well.


Fit perfectly, wired the exact same, are bight, and rugged. No bulb dropping out like the original incandescent. Very satisfied.

Still working flawlessly
Tom - 11/02/2021


Excellent replacement products for the bullet bass boat trailer. Upgraded all trailer lights to LED.


I was very concerned about getting position lights that would be a comparable replacement for those on my 20 year old car hauler. Saw these, checked the measurements, and prayed they would fit. I was very pleased to find these were the exact replacements and a simple R and R (remove and replace) had them up and running in less than 5 minutes. The LED replacements are so much brighter than my older incandescent bulbs. Ordering was simple, quick, and pain free. Great job etrailer!


Works perfect and you can't go wrong. Highly recommend

working perfect
Mark - 03/05/2022


Great, brand name products and some hard to find LED side marker lights. Refurbished an old EZ Loader boat trailer for carrying kayaks. Old incandescent lights were rotted off of the frame and the side marker lights in the fiberglass fenders were inside rubber grommets that were dry rotted. Etrailer had all the replacement lights, available in LED, and beat the price of any other option. Quality products. Delivered in 2 days under a free shipping promo. Etrailer is saved to my favorites for any trailer needs. Pic of the Yak project attached. New tail, fender and side marker LEDs!


Fits and works very well. I am now replacing the remainder of the lights to these led running lights.


Excellent product.


Just as advertised.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • LED Trailer Lights for a Lark Trailer
    Sounds like you have a T17 Torx bit that you are in need of. Your local hardware store will have this size. Try a Lowe's or a Home Depot. It is possible that you could replace your trailer light bulbs with LED bulbs, but most likely you don't have the correct housings that allow for that as most do not. I attached a page that has all of the LED trailer taillights we offer.
    view full answer...
  • Should LED Trailer Lights be Mixed with Incandescent Trailer Lights
    One main difference between LED lights and incandescents is the amount of power each one draws. I did a little research and found that if you were to have LEDs and incandescents on the same circuit, it would be too much power draw for the LEDs without using the proper resistors to compensate for the differences. It would be best to replace all the lights to one type or the other. However, if one of your stop/turn lights was LED and the other was not, that should be fine (provided both...
    view full answer...
  • Troubleshooting Trailer Taillight Setup Where LED and Incandescent Bulbs are Both Installed
    The adapter shouldn't limit current and should only add resistance to the connection so that it senses more of a load on it. I'd check to see how your lights are all wired. If they are all wired in series where the ground is connecting to the power of the next light then that is your issue as you can't mix LED and incandescent bulbs with this style of wiring. You need the lights all wired to the same power feed wire and grounding independently.
    view full answer...
  • Can LED and Incandescent Lights be Mixed, Used at the Same Time on a Trailer
    The lights don't have voltage or amperage regulators so it could potentially be an issue. However, I am in the minority around here about whether or not it would be a problem. Most others are certain that it would not be a problem so majority rules. I still believe that the potential for a problem is there if you mix LED and incandescent lights but it seems to work out for most people. But I would be remiss in my duties if I didn't at least mention the potential for a problem.
    view full answer...
  • Looking for Replacement Side Marker on 2010 Jayco Jay Flight Travel Trailer
    I wasn't able to track down a specific model number for the factory side marker your 2010 Jayco Jay Flight came equipped with (the Command number you found only relates to testing certifications), but looking at pictures of the trailer it seems like it's something similar to the Optronics # AL91RB. This particular assembly measures 2-1/2" long and 1-3/16" wide. I realize you really only need the lens itself, but it's important to keep in mind that unless you're able to find an exact replacement,...
    view full answer...
  • Replacement for Truck-Lite Signal-Stat 1500 Clearance Light
    The Thinline LED Clearance and Side Marker Light part # AL91AB for amber or part # AL91RB for red will be direct replacement options for a Truck-Lite Signal-Stat 1500. It should allow you to use the existing bezel.
    view full answer...
  • What Replacement Amber/Red Side Marker Lights Fit My Boat Trailer?
    I have a solution for you. After much research, the Optronics brand is the closest we have to the dimensions you are looking for. You are absolutely correct that the Optronics lights have a bit wider dimensions than your lights. The # AL91RB and the # AL91AB measure 2-1/2" x 1-3/16" x 7/8". With that being said, it is often much easier to replace the lights altogether than to look for an exact match of replacement lens. For the full units, I recommend the # AL82RB and the # AL82AB. These...
    view full answer...
  • Red Optronics Clearance Light Needed and Matching Chrome Mounting Bracket
    The Red version of the Sealed, Mini Rectangular LED Trailer Clearance, Side Marker Light # AL91CAB from Optronics is found as part # AL91RB on our site. The Chrome mounting bracket for both lights is part # A91CB and works with 90 Series or 91 Series Optronics lights.
    view full answer...
  • Boat Trailer Market Light Replacement Recommendation for Chaparral Boat Trailer
    Thanks for the picture of the light you are looking to replace. It looks like our closest replacement is the part # MCL-91RK which has the chrome base like what yours has.
    view full answer...
  • Will Optronics Side Marker Light # AL91RB Mount in Existing Rubber Grommets on Trailrite Trailer
    The Optronics Clearance/Side Marker Light, part # AL91RB, will mount in the rubber grommets that your Grote 4641 lights are installed in. I looked it up in the industry cross reference for lighting and it listed the # AL91RB light as fitting in your grommets. The rubber grommet we offer for the # AL91RB light is the Optronics Flush Mount Grommet, part # A91GB. This is a rubber grommet that is used when mounting the light flush to the trailer. It measures 3-5/16 inches long x 1-15/16 inches...
    view full answer...
  • Grommet To Use with Trailer Clearance Light # AL91RB
    For the clearance light part # AL91RB we have the grommet part # A91GB which is basically a hard rubber.
    view full answer...
  • How to Mounting the Mounting Bracket for A91 and AL91 Series Trailer Lights
    I would recommend using stainless steel sheet metal screws for mounting the Mounting Bracket for A91 and AL91 Series Trailer Clearance, Side Marker Lights, since the connection to the trailer needs to make a good ground connection.
    view full answer...
  • Replacement 2-1/2 Inch Long Optronics Marker Lights for Cargo Trailer
    The closest Optronics trailer light assembly we have available to your existing unit is the Optronics Thinline LED # AL91RB. This LED light measures 2-1/2 inches long and 1-3/16 inches wide. The mounting bracket # A91BOB it is used with (not included with the light) features bolt holes that measure 2 inches apart on center. Unfortunately the SAE P2 P3 number you found on the lens of your existing light doesn't indicate the actual light model but has to do with DOT regulations. If the...
    view full answer...
  • Replacement Tail and Marker Lights for 1996 Ranger Trail Boat Trailer
    Excellent idea, switching to LED. They use less power, last much longer and are brighter than incandescent lamps of the same size. Win, win, win. The grommet mount lamps you reference should fit in a 6-3/4 by 2-1/2 inch rough opening, which is the typical size. I'd recommend measuring the rough opening to confirm. If that dimension checks out, the # TLL12RK LED taillight kit would work well for you. For the marker lights, if the interior of their mounting brackets measure 2-1/2 by 1-3/16...
    view full answer...
  • Troubleshooting Trailer Wiring Blowing Fuses
    While we have no specifics on wiring for any make or model of trailer and can only generalize it does sound like something very simple - you have overloaded your running light circuits which is causing the fuse to blow, and the reason for that is almost always because you are using incandescent lights as opposed to LED lights. If this is the case, which I'm guessing it is because it is the most common, you will need to switch out at least your running lights to LEDs, and can do so cost-effectively...
    view full answer...
  • Recommended Replacement Clearance Lights for Red Peterson 152 Assemblies on Trailer
    Based on my research, the Wesbar LED Waterproof Grommet Mount Clearance Side Marker Light # 47-203668 referenced in your question should provide a nice replacement for your existing Peterson 152 unit. This red clearance light measures 2-5/8 inches long, 1-1/4 inches wide and 3/4 inches in height. Another option is the Optronics Thinline LED Clearance and Side Marker Light # AL91RB. This light has very similar measurements of 2-1/2 inches long, 1-3/16 wide and 7/8 inches in height. I...
    view full answer...
  • Turn Signals Not Working on an Accessory Connected to a 1998 Dodge Ram Pickup
    There is a possibility that this problem is due to mixing incandescent lights with LEDs, but this is unlikely. More likely is this being a grounding issue with the wiring. Usually, when one function is not working while others are, this points to a problem with how the ground is connected. Check the connection point of your accessory's ground wire to ensure that it is free of corrosion or rust. If you find any, clean the area or move the connection to a cleaner spot. Check your vehicle's...
    view full answer...
  • Replacement Optronics Clearance/Marker Lamps to Replace Peterson PM152
    The Optronics # AL82RB would work as a replacement for the Peterson PM152 lamp, but from what I found on Peterson's website, the PM152 features two prongs on the back which is more like the # AL91RB from Optronics. Either would work for you, but I'd use the # AL91RB, assuming you have the 2-wire pigtail like # A46PB already wired up on your trailer.
    view full answer...
  • How to Wire up the Thinline LED Clearance and Side Marker Light to Single Wire Trailer
    To use the # AL91RB on a trailer that has one wire for the power wire and then grounds through the mounting bracket would only require the bracket part # A91BB for the bracket and then part # A91LW for a single wire connector.
    view full answer...
  • Mounting Bracket Recommendations For Optronics Thinline LED Clearance and Side Marker Light
    For the # AL91RB trailer lights we have a couple options for mounting brackets. For a self-grounding bracket where the light is grounded through the mounting hardware I recommend part # A91BB. The gasket is included. For a mounting bracket that has an open back you need part # A91BOB.
    view full answer...
  • Are Mounting Brackets Needed To Install Optronics LED Trailer Clearance Lights # AL91RB
    For installation of the Optronics LED Trailer Clearance Lights, part # AL91RB, you will need to use an Optronics Mounting Bracket. You can use either the Optronics Black Mounting Bracket, part # A91BB, or the Chrome Mounting Bracket, part # A91CB. The brackets are sold individually, so you will just need to order the same quantity as the number of lights you have. I have linked a video that show the installation of the Optronics AL91 Series Lights.
    view full answer...
  • Size of Mounting Hole Required for Installing Optronics Grommet # A91GB
    The Optronics Grommet # A91GB that you referenced, which is designed to work with the Thinline LED # AL91RB that you were looking at, will install into a mounting hole on the trailer that is 2-7/8 inches across and 1-1/2 inches tall. If you do not have this type of mounting hole on your trailer, you can use the Mounting Bracket # A91BOB instead, which will allow for a surface mount installation. I have attached a couple short video demonstrations on these products that you can also check out.
    view full answer...
  • Recommended Side Marker Lights for EZLoader Trailer
    I can help you find the correct parts for your EZ Loader trailer. Based on the photos you submitted, the # AL91RB will fit your style connector on your trailer. The amber light is # AL82AB, and the grommet you will need is # A91BOB. All these items come in quantity of 1 so you will want to adjust the quantity on the grommets page to 2. I have linked all the above products to this page for your convenience.
    view full answer...
    Image 1 for Image 2 for
  • LED Clearance Light Recommendation for Sundowner Horse Trailer
    What you have on your horse trailer is a pretty common clearance light that we do offer in red and amber as an LED. For the red you'd want the part # AL91RB and for amber part # AL91AB. You'll also need the grommet part # A91GB and the right angle pigtail part # A46PB and you'd be set.
    view full answer...
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