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

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

Item # AL91AB
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Optronics Rear Clearance,Side Marker Trailer Lights - AL91AB
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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. Amber lens. PC rated. Lowest Prices for the best trailer lights from Optronics. Thinline LED Clearance and Side Marker Light - Submersible - 3 Diodes - Rectangle - Amber part number AL91AB can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (892)
  • Q & A (13)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - AL91AB

  • Clearance Lights
  • Rectangle
  • LED Light
  • Amber
  • 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. Amber 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
  • Amber 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 LED1225-3A
  • Truck Lite 15250Y
  • Grote 47083
  • Peterson M153A
  • Maxxima M20320Y

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.

AL91AB Optronics Thin Line Mini LED Side Marker/Clearance Trailer Taillight - PC Rated - Amber

Alternate part number: AL-91AB

California residents: click here

Customer Reviews

Thinline LED Clearance and Side Marker Light - Submersible - 3 Diodes - Rectangle - Amber - AL91AB

Average Customer Rating:  4.9 out of 5 stars   (891 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. Amber lens. PC rated.

- AL91AB

I wish there was an indication of the connects on the back along with suggestion for connectors. 557919

The lamp you purchased would use a # A46PB
Right Angle 2-Wire Pigtail for Optronics Trailer Lights - 2-Prong PL-10 Plug - 6" Lead
plug and a # A91BOB
Mounting Bracket for Optronics A91, AL82, AL90, AL91, or AL191 Series Lights - Open Back - Black
mounting base. Ive linked them below for you.
-- Mike L - 08/25/2018


- AL91AB

I had a heck of a time finding this side marker light and as it fit into a specific rubber mount (by another manufacturer) which in turn fit into a specific opening in the trailer's fender and the original light was marked by yet another manufacturer (who no longer makes this model) I was VERY glad to discover Optronics made a perfect replacement. It was exactly as described and fit perfect! The best part is it lights up beautifully! Thanks etrailer, you saved the day!! 147552

Still working fine after being submersed numerous times.
Roger B - 08/21/2015


- AL91AB

Easy to install and looks to be a exact replacement for the factory installed running lights on my boat trailer. 667856

Light is still working great, would buy again if the need arises.
Stephen L - 07/09/2020


- AL91AB

Boat Trailer: Following a highly successful conversion of the brake/tail & DOT lights, I went ahead with changing the amber running/side maker lights. Working with Hally made ordering smooth and simple. The parts arrived via USPS as expected in excellent condition. The new LEDs fit perfectly into the OEM housing, so I chose not to change them at this time. THe difference in illumination is just outstanding!!! I will definitely use eTrailer again with two great experiences on this project. Seeing the outcome, I cannot explain why it took me so long to decide to convert. 566618

After a year and around 2500 miles, the lights continue to perform flawlessly. It was a good decision to convert to LEDs and I will not wait as long should there be a next time.
John - 09/20/2019


- AL91AB

Nice bright LED marker light. Perfect f it! 903123

- AL91AB


- AL91AB
by: 10/01/2020

always great products 899322

- AL91AB

Exactly what I ordered and great delivery time! Fits the trailer perfectly. 893999

- AL91AB


- AL91AB

Lights are much more reliable then the standard bulb. 883883

- AL91AB

Easy install. Quality product. Bright l ight. 881595

- AL91AB


- AL91AB


- AL91AB


- AL91AB

Part was what I ordered. Service was great. Good experience. 873639

- AL91AB
by: 09/01/2020


- AL91AB

just what I needed 868699

- AL91AB

Excellent lights and fast shipping. thank you 867788

- AL91AB
by: 08/20/2020


- AL91AB

Great service and the product is above average. 864771

- AL91AB

First of all let me say but I was kept informed of where my package was and it arrived on time and was all complete and good condition well packed although I had made a mistake and had to return it it just took a simple phone call. I did have to wait a few minutes but it was taken more care of they even took the replacement order right then I had just ordered the wrong things and I had to replace.I’ve dealt with them before, because I have three trailers 864018

- AL91AB
by: 08/15/2020


- AL91AB

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 868933

- AL91AB

I was glad you had light in stock 858274

- AL91AB
by: 08/07/2020

Staff helpful. Products are good, quick service 864317

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • Upgrading Lights on 2000 Tracker PT175 Trailer to LED
    We do offer a wide variety of replacement lights for trailer but since trailer manufacturers don't keep a record of what they use on trailers I would need some pictures of the lights you are wanting to replace along with some measurements so I can be sure to recommend the correct parts.
    view full answer...
  • Will LED Clearance Light Work With One Wire
    Yes, the Thinline LED Clearance and Side Marker Light - Submersible # AL91AB will work with your single power wire, as it uses a 2-wire (one for power, one for ground) pigtail or 1-wire pigtail with a self-grounding bracket. To mount this light you have a couple options. The first is the Mounting Bracket # A91BOB with Right Angle 2-Wire Pigtail # A46PB; you'd also want to use the Self-Tapping Screw # 1131832. Your other option to mount this light is to use Self-Grounding Mounting...
    view full answer...
  • How to Determine if Amber Clearance Light Will Work on Trailer
    In order to determine if the Thinline LED Clearance and Side Marker Light # AL91AB will fit your trailer you simply need to measure your light and see if it matches; this light is 2-1/2" long x 1-3/16" wide x 7/8" deep. It is also a great option because it can be either recess or surface mounted. For a surface mount you will use Self-Grounding Mounting Bracket # A91BOB with Plug # A91LW. For a recess mount you will use Grommet # A91GB with Right Angle 2-Wire Pigtail # A46PB. I...
    view full answer...
  • Replacement Rectangular Amber 2-1/2 Inch Long by 1-1/2 Inch Wide Clearance Lights
    The “SAE P2PC 98” you provided is a code used by the department of transformation and will not have any bearing on the correct replacement. In order to determine the correct replacement I would need you to either A) remove the lens and find the part number inscribed on the base or B) send me a dimensional photo of the light.
    view full answer...
  • How to Select Replacement Trailer Lights
    Trailer light part numbers are usually found on the base of the light, rather than on the light lens. If you can find a part number on the base you can search our site by entering that number into our search box. The codes on a lens are often DOT numbers rather than actual manufacturer part number. We do carry many brands of trailer lights, including lots of Optronics products, and the page I linked for you will let you select the type, size, brand and color of light you want. All...
    view full answer...
  • Is the Peterson Clearance and Side Marker Trailer Light Offered with Female Terminals
    It sounds like you are looking for the Thinline LED Clearance and Side Marker Light part # AL91AB which has female terminals in the rear but a better option for you would be to just replace the pigtail with the Peterson Right Angle 2-Wire Marker Light Plug part # 153-49.
    view full answer...
  • Replacement Front Clearance Lights Needed for 1996 Tiffin Allegro
    It's kind of hard to tell exactly what lights will work for your 1996 Tiffin Allegro, but I think something like the 2-1/2" x 1-3/16" Thinline LED Clearance and Side Marker Light # AL91AB should do the trick. If your lights have different dimensions then I've linked our selection of replacement amber lights that you can filter through, or you can take some measurements and send those in with some close up pictures of the lights that I can use as a reference.
    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...
  • 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...
  • Ways to Convert Trailer to LED Type Lighting
    You can convert your RV to separate turn signals and/or LED operation in a couple of ways, depending on how much wiring modification you care to do. Any of your existing lights can be converted to LED operation by swapping out the incandescent bulbs for LED-type replacement elements. We have LED equivalents that are drop-in replacements for many popular standard bulbs. All appear on the linked page and can be selected by bulb number, such as the popular 194 type bulb # A194B that can...
    view full answer...
  • License Plate Holder and Replacement Lights for Exiss Horse Trailer
    We have a few types of license plate holders to choose from and you can see all of them on the linked page. You might prefer one design over another for your Exiss horse trailer, such as the CE Smith Tread Plate design # CE26053A As for trailer lights we have products that are direct replacements for many popular OEM lights, and we also offer both basic incandescent bulb lights as well as brighter high-efficiency LED types that draw less power. We offer tail lights like Optronics' oval...
    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...
  • Is There a Difference Between the F008584-2 and the F008594-2
    Yes. The only difference between the Fulton # F008584-2 and the Fulton # F008594-2 is the color. Both of these step fenders are designed for 14" wheels. If you need mounting brackets you can use the Mounting Brackets for Trailer Fender - 13"/14"/15" Wheels - Galvanized Steel - Qty 2 # CE26098G-2 and you can add clearance lights on these fenders with the Thinline LED Clearance and Side Marker Light - Submersible - 3 Diodes - Rectangle - Amber # AL91AB (LED) or # A91AB (incandescent). I've...
    view full answer...

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    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.
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    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.
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Info for this part was:

Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Jameson C
Expert Research:
Adam R
Video Edited:
Patrick B
Video Edited:
Jacob T
Updated by:
Laura H
Updated by:
Amy B
Updated by:
Sarah W
Updated by:
Brian T
Updated by:
Hannah L
Updated by:
Noah M
Video by:
Dustin K
Video by:
Jonathan Y
Installed by:
Cole B
Installed by:
David F
Test Fit:
Shane H

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