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Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side

Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side

Item # STL9RB
Our Price: $25.67
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Shipping Weight: 0.58 lbs
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5-1/16" x 4-9/16" Square. Waterproof trailer light serves 7 functions: stop, turn, tail, rear reflex, side marker, side reflex, and license plate light. Durable plastic housing. Stud mount on 2" centers. 3-Wire design. Great Prices for the best trailer lights from Optronics. Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side part number STL9RB can be ordered online at or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - STL9RB

  • Tail Lights
  • Square
  • LED Light
  • Red
  • 5L x 5W Inch
  • Surface Mount
  • License Plate
  • Rear Reflector
  • Side Marker
  • Side Reflector
  • Stop/Turn/Tail
  • Submersible Lights
  • Optronics

5-1/16" x 4-9/16" Square. Waterproof trailer light serves 7 functions: stop, turn, tail, rear reflex, side marker, side reflex, and license plate light. Durable plastic housing. Stud mount on 2" centers. 3-Wire design.


  • Square trailer light serves 7 functions
    • Stop light, turn signal light, tail light, rear reflex reflector, side marker light, side reflex reflector, license plate light
  • Built-in reflex reflector removes the need for a separate reflector
  • Sealed, waterproof construction is submersible
  • Durable surface-mount technology (SMT) construction of LED circuit board
    • Better withstands shock and vibration
    • Allows for improved heat distribution
  • LEDs make great replacements for incandescent lights
    • Last 50 times longer
    • More efficient - provide better light with less power output
    • No bulbs to replace - no brittle filaments
  • Molded plastic housing and durable acrylic lens
  • Red lens over white LEDs
  • Stud mount with included hardware
  • 3-Wire pigtail
    • White wire is the ground
    • Brown wire is for the tail lights
    • Yellow wire is for the stop and turn lights


  • Configuration: driver's side
    • Passenger's side: STL8RB (sold separately)
  • Dimensions: 5-1/16" wide x 4-9/16" tall x 2-5/8" deep
    • Light face: 4-9/16" wide x 4-9/16" tall
  • Distance between mounting studs (center on center): 2"
  • Diodes: 14
  • Power draw at 12.8V:
    • Stop light: 0.259 amps
    • Side marker light: 0.062 amps
  • Lifetime warranty on LEDS

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 circuit board is sealed, which means that water will not damage the diodes or circuit board.

STL9RB Optronics Combination LED Taillight with License Plate Illuminator for Trailers Under 80" - Red lens - 14 Diodes

Alternate part number: STL-9RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side - STL9RB

Average Customer Rating:  4.8 out of 5 stars   (391 Customer Reviews)

5-1/16" x 4-9/16" Square. Waterproof trailer light serves 7 functions: stop, turn, tail, rear reflex, side marker, side reflex, and license plate light. Durable plastic housing. Stud mount on 2" centers. 3-Wire design.


Perfect replacement for factory installed lights.
Was able to use factory drilled mounting holes.
Installed in less than 45 minutes. Much brighter than original lights. I believe that they should provide many years of trouble free use.



Its been about a year, the lights have gone through all four seasons here in Minnesota and continue to function flawlessly. They have been a great investment saving me the time and effort needed to replace light bulbs.


The trailer light assembly is exactly the one needed to replace the one on my 19 year old boat trailer.

The assembly arrived in a timely manner and is the one shown on the company web site.


Nice and bright , worked great for my flatbed upgrade .easy website and easy shipping. Ordered from this company for a few years and have never had an issue


Very impressed! Ordered the STL9RB and the other side twin STL8RB. Etrailer shipped the wrong twin. One phone call and 5 minutes later, the correct part was shipped!

The LED tail lights and side markers (MCL82ADB Optronics LED Surface Mount Marker/Clearance Lights with Reflex) are for a home-built cargo trailer. Decent build, waterproof, and the plastic is of a heavy gauge to last a long time in the Arizona sun. These units are equipped with LED's, and should last a long time.

Thanks etrailer!

Robert B.


One year in, and tail lights are still holding up well in the Arizona sun . . . . . :-


I installed lights on boat trailer in May 2019...
Launched boat several times with water covering lights.
Stored boat and trailer outdoors all winter of 2019/2020.
April 19, 2020 I took boat and trailer to marine shop for maintenance.


Thank you for selling a reliable, quality product!

David V.


Lights still work perfectly after heavy snows during 2020 2021 winter outdoor storage.


They work as intended. Have to make sure of proper ground.


Had to replace the tail light on my motorcycle trailer that vibrated and broke on my last trip (different manufacturer). Just completed a 500 mile trip, including periods of rain. No problems at all. Grat product.


Excellent product at a great price.


Very nice lights for the price. They were easy to install and the mounting bolts fit right into my existing holes from my "different brand" lights that were damaged. They are very bright! Not sure if they are "truly" submersible like the add says, as the wires simply go through a manufactured hole in the back of the case, so the wiring inside must be sealed. Either way, I just filled this hole with some regular silicone caulk. As with all trailer lights I would recommend buying or making light guards, as these lights can break easily. Overall I am happy and would definitely recommend!

John R.


Thank you! The lights are great, no issues at all, and tough as nails!!! I have them on a 10k 6x10 dump trailer, that I beat the snot out of, gravel logging roads, mud, snow, ice, driving through brush. I just wish my trailer tires were as tough as those lights. Thanks again, and if I ever need anything for my trailers, I will be shopping etrailer!!!


Installed this and several other lights on a new trailer. Factory lighting and wiring left a lot to be desired, and with the help of I was able to get everything fixed up like I wanted.

Lights work very well - clear and bright red tail and turn/brake lights.



All of the products I purchased its been about 2 years now are still working great. Thanks for checking in.


STL9RB & STL8RB Trailer tail-lights. Removed old standard bulb tail-lights, from my small "runaway" camper trailer, and replaced them with these LED tail-lights. The LED lights are much brighter than the old lights. Installation was easy. Followed the instruction video. It took me about twenty minutes from start to finish. They work great and look great.



Still working great.


Looks Great! Works Great! These were added to a 14' Kaufman Dump Trailer that I wanted to use as a utility trailer also, but when completely tarped, the brake/tail/turn lights were covered. So, I added these lights to the side of the frame so that they could be seen when the trailer was securely tarped.

Winsel S.


I still love the products purchased


Good product, good service, prompt delivery, personal touch with


Nice and bright


Excellent product easy installlook and work great.


Put these lights on my trailer 1 year ago. Used trailer 1/2 doz. times since the install. This weekend find that the left light running light is out. The right light 1/2 the LED's are out. I had my old $6 units on there for 16 years. Obviously got better service from them.

Etrailer Expert

Patrick B.


One of our Customer Service reps, Nikki, has sent you an email about the warranty policy. The LEDs in these lights are covered by a limited lifetime warranty. Check your email for more information on getting the bad lights to us so we can send you new ones.


Installed the submersible Led trailer taillights on my unsprung motorcycle trailer. The 4 screws mounting the led/lens to the light housing vibrated loose and lost two of the screws. I made the mistake of trying a loctite thread block on the screws--- big mistake. Loctite crazes and cracked the plastic lens. Finally used silicon sealer adhesive to mount the entire lens/led lights to the brake light housing. All is well after 1 year of longer multi-state trips .


Awesome idea! I've used them for the last several years but, unfortunately, I broke the lens when I hit something. My old ones didn't have replacement lenses, my new one do. If I break them again, it will be a lot cheaper and easier just to replace the lens instead of the whole tailight.

Ned P.


LED Submersible Trailer Stop, Turn, Tail and License Plate Light. The LH and RH taillights that Ive been using for a year now still work perfectly theyve been submerged hundreds of times! Theyre several times brighter than my old LED lights-a real safety factor! The only thing Id like to see would be a non-license-plate version of the LH unit for states like MN that dont issue trailer license plates. I had to tape over the illuminating lights on that side. A truly great product!


Appears to be of excellent quality and fit. Easy replacement of old bulb type lights. Everyone should retro their lights to LED's. Big safety improvement. Don't have a report on how submersible/water tight these lights will be yet.



Nothing to add, but.... awesome. they are bright and work fine on the boat trailer, even after several dunkings in the lake.


I purchased these lights to replace the factory lighting on my 10x6 utility trailer. The driver's side factory light had quit working and I decided I would like some better lighting. I installed them on my atv trailer which doesn't get used often but I will say these lights were easy to install and much brighter than my factory lights. I highly recommend them and enjoy shopping on etrailer.


Ordered both left and right matching pair stl9rb and stl8rb , shipping was great came neatly packaged with plenty packing material and shipping cost was excellent in comparison to other sites .
The main reason for ordering was i am using an electronic wiring harness in 2011 Hundai Sonata,the standard tail lights on the trailer were incandandesent bulbs and pulled too much current kicking the breaker in the electronic control module on wiring harness , i was aware L.E.D.s draw much less current so when these plus marker lights were replaced .PROBLEM SOLVED , THANKS E-TRAILER


My trailer lights finally work with my Nissan pickup. After much trouble-shooting and with great support from the Etrailer tech. dept., I solved my turn signal/brake lighting problem. It turned out that it wasn't my ground or trailer wiring or defective trailer harness but that my pickup couldn't handle the extra amperes for the 1157 bulbs in the lights that came on the trailer. The Etrailer technician suggested getting LED tail lights which have a much lower amperes requirement than the 1157 bulbs. Now everything works. The lights were easy to install and are very bright. The Etrailer staff was fantastic. Thanks!


Had to replace lights on my utility trailer after trying to take a 8' ft wide trailer thru a 7' ft wide gate. Figured if my neighbor could take his tractor thru my trailer would go. Glad I went with these LED lights as they were easy to wire and much brighter than the old bulb type.


Installed these vs the regular blub lights and these are much better. They are brighter and you don't have to worry about vibrating bulbs loose.



Have had them for a year and no issues. Would purchase again.


Boat trailer light, well sealed, bright, color code even matched a yacht club trailer. If you don't care about the license plate light you can order two of the right lights and save a couple bucks although the color code may no longer match - no worries - you're smart enough to sort that. If your plate doesn't hang under the light the white lens on the bottom makes no difference

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