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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 Clearance 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 (749)
  • Q & A (10)
  • Videos (1)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - AL91AB

  • Clearance Lights
  • Rectangle
  • LED Light
  • Amber
  • Surface Mount
  • 2-1/2L x 1W Inch
  • Optronics
  • Submersible Lights
  • 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

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

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

Video Transcript for Optronics Trailer Lights - Clearance Lights - AL91AB Review

Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (749 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

Lights are a direct replacement for my trailer lights. Lights are much brighter than the original were. 124433

Lights still working great after a year of use.
George W - 04/12/2015


- AL91AB

fast service great product good price t hanks 553817

- AL91AB

Great fit and optics works good 546158

- 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

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

- 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

Much brighter light from all viewing angles than the OEM lights. Easy snap in replacement if it ever fails. The self grounding one-wire base would have made my install easier. The two prong plug I ordered was a tight fit but it worked. I would recommend etrailer. 256594

- AL91AB

I cant tell you how disappointed I am...........that I did not find out about etrailer.com until now. The LED marker lights that I installed on my Haulmark Lowhauler are simply amazing. They are brighter than the big name companies truck lites out there that I had bought. It is too late for me to return my other lites but I went ahead and changed all the lights on my Nautique boat trailer with your products. It is the difference between night and day. Thanks for the great products. You have gained a NEW LOYAL customer. Speaking of that... I placed another order today. Thanks again!! 73760

- AL91AB

everything was as expected great service 739319

- AL91AB

Exact fit and upgrade to old dim lighti ng. 735828

- AL91AB

Very informative and the service and follow ups after the sale are amazing. 729021

- AL91AB

Super bright, at a great price. Easy to install, and exchange if they get damaged. 722868

- AL91AB

Very bright great upgrade from the old lights 721674

- AL91AB

Nearly finished with my gooseneck 18,000 GVWR trailer. All my etrailer parts arrived promptly and are of excellent quality. 720764

- AL91AB

Super bright and clean lines. Very plea sed. 720081

- AL91AB

Received my new lights and harness on time and nicely packaged. There was a mix-up with the harness and Stacey took care of it immediately. Thanks for great customer service! 715266

- AL91AB

I needed help with an address problem & Carol is the women who helped me with it. I received my order and wanted to say I will be doing more business with them as needed. Very happy with my experience with them. 715103

- AL91AB

Quality lights. 704767

- AL91AB

Excellent quality! 704589

- AL91AB

Love them. Nice and bright 703658

- AL91AB

Products ordered and delivered were exactly what I needed. Ordering parts was easy. Etrailer provides ample info describing parts listed on their website. Delivery was quick. I will order from them again. 706838

- AL91AB

parts ordered where as stated and quick delivery for my shorelander trailer marker lights and harness 703370

- AL91AB

Nice product! As advertised!! 699832

- AL91AB

I bought this to replace one that I only bought about 2 years ago. These are supposed to last 30,000 hours but the previous one didn't come close. Hopefully, this one will. The service from retailer is great! 697563

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...
  • 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 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...

Do you have a question about this Trailer Light?

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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
Updated by:
Laura H
Updated by:
Amy B
Updated by:
Sarah W
Updated by:
Brian T
Updated by:
Hannah L
Installed by:
Cole B

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