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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: $9.61
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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 1-800-940-8924 for expert service.
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  • Reviews (1740)
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Optronics Trailer Lights - AL91RB

  • Clearance Lights
  • Rectangle
  • LED Light
  • Red
  • 2-1/2L x 1-3/16W 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:  4.8 out of 5 stars   (1740 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.


I have been more than pleased with the Optronics brand lights! These are no exception!

I, like others, am amazed at the brightness of the lights. They are a huge upgrade over my existing incandescent lamps!

I really like the way them mate with the mounting brackets and wire connectors. They snap into the brackets securely and can be removed. I also like the matching connectors as they also snap into place securely.

I would buy again and I would recommend to others as well!



A year later and Ive had zero issues with the LED lights. All the individual LEDs continue to work and the brightness has not diminished over time! Im extremely happy with these!


Ordered these as future spares for the set I installed a year ago while overhauling my boat trailer with other parts purchased from Lights work great and are extremely bright at night - a big plus!!


Perfect fit for my trailer. Easy insta ll.


This company has excellent customer service! Claire corresponded via e mail and took the time to follow up with me concerning my order. You could not do business with a better group of people. Great customer service makes a great company. Thank you etrailer and thank you Claire.


Lights are great and priced fairly. I’ve ordered several things from etrailer and there products don’t disappoint


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!

Diego S.


Good. No complaints.


The lights work great as with any light they only help if the people driving around you know what there for. Helps the tralier to be seen better thank you.


Worked like a CHAMP. Direct Plug-N-Play and shipping was a breeze!
(2008 Triton 21X2 trailer)


Exact replacement. Easy install. Great service


The amber light is what I needed. The red light is useless to me no back, mounting stud, or wire connection. Discriptions of both are almost exactly the same. Very disappointed


Perfect replacement running light for my lawn trailer.


Exactly what I needed. Etrailer is very helpful and super fast shipping. Highly recommended


It was exactly as advertised, very bright and well built. If I ever need one again I will definitely reorder.


Worked perfect, never an issue with this company, A+

Dan S.


The lights work great and still look new after a year of use, etrailers customer service and quality products puts them a step ahead of the others, especially the customer service , highly recommended by me!!


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.


Another great experience with etrailer.


Lights worked great. Much brighter than the originals.


Looks and works great.


Fit great with the gasket that goes with it. Great company to work with. Thanks Etrailer.


Thanhs Dave for taking prompt care of my order.


Timely delivery. Plug and play fitment like original. Just what I needed. Working great after one year of use.


Works as advertised.


Products were as described and prompt shipping too.


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


Illuminating experience!

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Replacement Trailer Clearance Light that Fits in Wedge Mount
    Thanks for the picture of your trailer clearance light. It's one of two options depending on how long it is. It's the part # MCL75RB if the light is 3-15/16 inches long or # AL91RB if it's 2-1/2 inches long.
    view full answer...
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  • Upgrading To LED Trailer Lights For a Heritage Trailer Carrying 2003 Lund Fisherman Boat
    The Optronics LED Combination Trailer Tail Lights # TLL160RK will replace your tail lights for LED on your Heritage trailer. If you are able to remove the clearance lights from their bases we have the following Amber/Red lights below. Thinline LED Clearance and Side Marker Light Amber # AL91AB, Red # AL91RB Miro-Flex LED Clearance or Side Marker Light Amber # AL191AB, Red # AL191RB Thinline LED Mini Clearance and Side Marker Light Clear Lens Amber # AL91CAB, Red # AL90RCB
    view full answer...
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  • Optronics Trailer Clearance Light Similar to AL 91RB that Installs With Smaller Hole Drilled
    The Optronics clearance light part # AL91RB in all of it's configurations would require a hole to be drilled for a harness like the part # A46PB to install with a grommet like the part # A91BOB. There isn't a way to mount it flush without drilling. If you used the part # AL82RB instead though it would require a much smaller hole be drilled since the entire harness of the other setup gets ran through the hole.
    view full answer...
  • Bearing Kit for 3,500 lb Trailer Axle and LED Clearance Light for Pace Utility Trailer
    The thickness is right at 1/8 of an inch for the mounting plate of the spare carrier part # FSTC1000301. For the LED version of the light in your picture you would want the part # AL91RB. Or part # MCL95RB for a version of the light that includes a base. The correct bearing kit for a 3,500 lb trailer axle is the part # BK2-100.
    view full answer...
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  • Replacement Rear Clearance Lights For a Sure-Trac Utility Trailer ST7211HST-B-030
    Based on images I could find for your Sure-Trac utility trailer model ST7211HST-B-030 it appears is uses either the Incandescent # A91RB or LED # AL91RB lights. These are held in place with the Grommet # A91GB which is 3-5/16" long x 1-15/16" wide. If you have a different style or size light please send me some images with measurements and I can verify what we have for a replacement.
    view full answer...
  • Replacement Parts for Optronics Identification Light Bar on Trucks and Trailers
    For the Identification Light Bar for Trucks and Trailers - Weatherproof - Incandescent # MC93RB you referenced we have both the Light Bar Replacement Wiring Harness MC93 and MC94 Series # A93PB and the Optronics Trailer Clearance and Side Marker Light - Submersible - Incandescent - Red Lens # A91RB. If you want the LED lights then you will use the Thinline LED Clearance and Side Marker Light - Submersible - 3 Diodes - Rectangle - Red # AL91RB.
    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...
  • Looking for LED Version of # AL91RB Mini Rectangular Clearance/Side Marker Lamp
    You bet we do! For the LED version, you'll need part # AL91RB. The lamp can be grommet mounted using # A91GB or surface mounted using a self grounding base like # A91BB for black/ # A91CB for chrome or a standard base like part # A91BOB for black/ # A91OB for chrome. If you use a self grounding base, use the single wire pigtail, part # A91LW or for the standard base, use the two wire pigtail, part # A49PB.
    view full answer...
  • Replacement Fender Solution for 2005 Crestline Trailer
    I looked up the Shorelandr fender SK0329-01 and our closest option is the Fulton fender part # F008574 which measures 9-5/8" Wide x 42-5/8" long x 12-3/4" tall. To add clearance lights to this you'd need the part # AL91AB for amber lights, part # AL91RB for red, part # A46PB for pig tails, and for grommets # A91GB.
    view full answer...
  • Availability Of White Replacement Fender For 2003 Shoreland'r Trailer W/ ST205/75R15 Tires
    I sure can! Based on the picture you provided the correct replacement fender for your trailer is going to be the Plastic, Single-Axle Trailer Fender w/ Top and Side Steps - White - 13" to 15" # PF11X35W which will work perfectly with the ST205/75R15 tires on your 2003 Shoreland'r Trailer and closely resembles your current fender. You will also need mounting brackets # PF1135-BKT-2 to mount the fender to your trailer. In regards to the clearance lights I will need to know the length...
    view full answer...
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  • Clearance and Side Marker Light With Clear Lens and Red LEDs
    We do carry a number of options for clearance lights that have a clear lens and red LEDs, but the red equivalent of the Thinline LED Mini Clearance and Side Marker Light - Clear Lens - Amber # AL91CAB has a red lens as opposed to a clear lens; it is the Thinline LED Clearance and Side Marker Light # AL91RB. If you want to go this route you can mount it with Grommet # A91GB (recessed mount) or Mounting Bracket # A91BOB (surface mount) with Right Angle 2-Wire Pigtail # A46PB. For similar...
    view full answer...
  • Are Red & Amber Square Trailer Clearance and Side Marker Light Submersible
    Hello Michael, The Square Trailer Clearance and Side Marker Light with Reflex Reflector - Amber # MC37AB and Red # MC36RB are only available in non-submersible versions. There isn't a light with the exact same 2-3/4" L x 2-1/8" W dimensions that is submersible but we do have options that are submersible like the 2-1/2" x 1-3/16" Thinline LED Clearance and Side Marker Light - Amber # AL91AB and Red # AL91RB.
    view full answer...
  • Recommended Fix for Cargo Carrier Lights That Hyperflash
    Odds are your cargo carrier's lights are the super-efficient LED type. These can cause turn signal hyperflashing as you describe. This does not cause any actual harm to anything but it can certainly be annoying. Your options are to try load resistors # DI34ZR that will simulate the resistive load of a standard incandescent bulb, or to replace the cargo carrier lights with a set of incandescent lights such as # 20174.
    view full answer...
  • 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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  • Parts Needed to Install Optronics Submersible Red LED Clearance and Side Marker Light AL91RB
    The Optronics Thinline Submersible Red LED Clearance and Side Marker Light # AL91RB installs using a base, part # A91BOB in black or part # A91OB in chrome finish. A 2-wire pigtail # A46PB will allow for electrical installation. The white wire on the pigtail is ground. If your original light used only 1 wire then its base provided the ground connection. In this case you can use the self-grounding base # A91BB in black or # A91CB in chrome finish. In this case you will use Single Wire #...
    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...
  • 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...
  • 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...
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  • 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...
  • Replacement Trailer Clearance Light for PM150
    The most similar trailer clearance lights we offer to replace the PM150 lights you have now would be the Thinline LED light part # AL91RB. For a replacement harness that would plug into this you'd need the part # A46PB and then for a grmmet part # A91GB for a flush mount or part # A91BOB for a bracket for surface mount.
    view full answer...
    Image 1 for
  • 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...
  • Stop/Turn/Tail Wiring Connection to Side Clearance Marker Light
    For your Trailer Tail Light - Stop, Tail, Turn - LED - Waterproof - 10 Diodes - Red Lens # STL72RB and Thinline LED Clearance and Side Marker Light - Submersible - 3 Diodes - Rectangle - Red # AL91RB, you will need the Wiring harness # A45PB as well as # A46PB. If you want the side marker light to only be a running light you will connect to the black wire. If you want it to be turn only, you will need to use the Vehicle to Vehicle Tail Light Converter # 118158 to isolate that function.
    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...
  • Availability Of Marker Light With Rounded Base For A 2006 EZ Loader Boat Trailer
    While we do carry a ton of red marker lights, we do not carry anything with a rounded base like you described. It may be something specific for EZ loader trailers made around that year. We do have some similar flat base lights like the Optronics # AL91RB and # A91GB for a grommet. If you are looking for a direct replacement, it might be worthwhile contacting an EZ loader dealership with your VIN. I do not have access to their database here so I am not able to reference a VIN.
    view full answer...

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