1. Trailer Lights
  2. Optronics
  3. Clearance Lights
  4. Rectangle
  5. LED Light
  6. Red
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
lowest price pledge
Our Price: $9.57
You Save: 60%
Trailer Lights
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.04 lbs
In Stock
Optronics LED Light Trailer Lights - AL91RB
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

Customer Photos


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. Lowest 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 etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (889)
  • Q & A (34)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - AL91RB

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

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 Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (889 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.

- AL91RB

excellent trailer maintenance parts for the modular lights on my snowmobile trailer. Perfect fit. No issues a year later. 674388

Add another year and Im still satisfied with these marker lights.
John J - 07/24/2020


- AL91RB

Exact fit and upgrade to old dim lighti ng. 735829

- AL91RB

Excellent replacement products for the bullet bass boat trailer. Upgraded all trailer lights to LED. 569046

- AL91RB
by: 10/01/2020

always great products 899323

- AL91RB

Perfect fit and exactly what I ordered! 894001

- AL91RB


- AL91RB

Great product and a great price. 883884

- AL91RB

Excellent product and excellent customer service. Carol C helped me through a shipping snafu and got the package to me quickly. Thank you. 897462

- AL91RB

Bought these for my EZ Loader for my 2012 Skeeter TZX 190. They shipped fast, arrived quickly (with waterproof grease packed in the terminals) and I couldn’t be happier with the fit/ function! 882176

- AL91RB


- AL91RB

Product was easily installed on our boat trailer. Thanks. 875793

- AL91RB

Light fits & works great! Looks almost like the light it replaced. 869563

- AL91RB

Again, I found what I needed at etrailer that I could not find anywhere else. I am checking the battery for my breaks in my tilt trailer now. If I find that it cannot be charged I will be ordering the battery plus two more of the LED clearance lights. The turn around time from the date that I ordered to the date that I received was quicker than I expected. Thumbs UP 868293

- AL91RB
by: 08/20/2020

AWESOME 865313

- AL91RB

Great service and the product is above average. 864773

- AL91RB

Great product at a fair price. 864547

- AL91RB

Perfect replacement, very bright, easy install. 863647

- AL91RB

Thank you so much. Had to replace Trailer lights on my boat, couldn’t find lights anywhere. Was leaving in 6 days. You had everything I needed and had them shipped to me in time for my trip. And the order was correct with no issues. Thanks again 868934

- AL91RB

The parts are good quality and they arrived quickly I will use etariler again 862084

- AL91RB

A simple way to buy trailer parts without having to find a dealer with the part in stock. The shipping may take a few days, but at least you can save gas and your time and keep on working . 859295

- AL91RB
by: 08/07/2020

Staff helpful. Products are good, quick service 864315

- AL91RB
by: 08/05/2020


- AL91RB

works well 855552

- AL91RB

Great product, fast shipping 855522

- AL91RB

Received my order on time. Installed lights on my trailer, hooked to my truck and the lights are a lot brighter than the incandescent ones that were on it . Third order from etrailer and won’t be the last. Had no problems so far. 850216

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • 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...
  • Replacement Tailgate Marker Lights for 1984 GMC C-Series Dually Pickup
    Yes, from what I found, you can use # AL91RB LED lights to replace the five original incandescent tailgate lights on your 1984 GMC C-Series Dually Pickup. These are standard size clearance lights (2-1/2 x 1-3/16) that were used on a variety of different trailer and some truck OEM applications and were sold under a number of brand names. Keep in mind that these lights don't have wires coming out the back, so in order to install them you'll also need a mounting bracket # A91BB to provide...
    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...
  • Incandescent Trailer Clearance Light that Uses 2 Wires
    In red you'd want the part # AL91RB or in amber you'd want # AL91AB for the submersible incandescent lights. For a two wire harness like you need you'd want the part # A46PB with grommet part # A91GB or bracket # A91BOB.
    view full answer...
  • 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...
  • Looking for Boat Trailer Clearance Light to Replace Signal Stat 1500
    According to my Optronics representative, the # AL91RB marker/clearance light you mentioned is a direct replacement for the Truck-Lite 15 series. The Signal Stat 1500 is how Truck-Lite refers to the same lamp in its LED version. A mounting bezel is available, part # A91BB for black or # A91CB for chrome plated ABS. If either one of these self-grounding bezels is used, use a # A91LW pigtail. If a non grounding bezel or bracket is used, a two wire pigtail like part # A46PB would be needed.
    view full answer...
  • Troubleshooting LED Single Wire Clearance Lights
    The reason your single wire LEDs aren't working is because you aren't using a ground. Most single wire lights like the Amber Clearance Light with Stainless Steel Hardware # 47-99-006 will have a separate ground like in the mounting hardware. The Thinline LED Clearance and Side Marker Light # AL91RB you asked from will ground through the mounting bracket # A91BB. The mounting with butyl tape is the issue. You need to have a ground connection for your clearance lights to work.
    view full answer...
  • How Does the Red Side Marker Trailer Light # AL91RB Install and what Parts are Needed to Install
    For the clearance light # AL91RB and the matching amber light you would install the lights in the appropriate bases like # A91BB and then use 2-wire pigtail # A46PB, plug it into the backs of the lights and attach the wires to the existing trailer wiring. The ground wire can be attached directly to the trailer frame. I have included a link to a video review of the clearance light for you.
    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...
    view full answer...
  • Hyperflashing On Trailer Lighting with a 2013 Ford Escape Troubleshooting
    Typically hyperflashing is a problem with LED's being installed on a vehicle that had incandescent bulbs. That problem usually does not occur with trailer wiring. Unless in your case the tow package wiring has it's own flasher unit separate from the vehicle taillights. Which if it does then you would need to replace all of the taillights of the trailer with incandescent bulbs or install load resistors on all of the taillight circuits on the trailer. For a load resistor you would want...
    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...
  • 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...
  • 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...
  • 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...
  • 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...
  • Troubleshooting Running Lights Blowing Fuse With Trailer Connected
    If you have been continually blowing the same running light fuse on your truck ever since it was new, and just with the trailer plugged in, then it sounds like the issue is that you have an overload, which means the amperage draw is too high. This is a pretty common problem when it comes to running lights - so common in fact that we have a section dedicated to it in our help article on wiring troubleshooting. You can see this in the section I cut out as well as the link I provided. The...
    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...
  • 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 # P230004A-2 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...
  • 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...
  • 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...
  • Recommended Amber, Red, And Clear Lens LED Clearance Lights For Karavan Boat Trailer
    The clearance lights we offer are not exactly the size you mentioned but these may work well for your trailer. I recommend part # AL82AB for the amber lights. These are LED lights and are submersible. These measure 2-1/2 inches long and 1-3/16 inches wide and 7/8 inch deep. For a red clearance light I recommend part # AL91RB. The clearance lights with a clear lens has amber colored diodes. We do not have a clear I recommend part # AL91CAB. All three of these lights have the...
    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...
  • 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...
  • 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...
  • 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...
    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...
  • Troubleshooting LED Identification Light Bar With Lenses Easily Knocked Off
    The LED Identification Light Bar for Trailers over 80" Wide - Submersible - 9 Diodes - Red Lens # MCL93RB has the wiring and housing for the individual sealed lights # AL91RB to fit. The only way to help them stay in place a little better is to add silicone around the edges to just add an additional seal that will hold up to vibration and water. An alternative option is to use the LED Identification Light for Trailers Over 80" Wide - 3 Diode - Sealed - Rectangular - Red # MCL98RB...
    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:

Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Reno H
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Jeffrey L
Video Edited:
Patrick B
Updated by:
Laura H
Updated by:
Amy B
Updated by:
Brian T
Updated by:
Noah M
Installed by:
Cole B

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.