bing tracking image
  1. Trailer Lights
  2. Optronics
  3. Tail Lights
  4. Square
  5. LED Light
  6. Red
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: $19.94
You Save: 36%
Trailer Lights
Add to cart
In Stock
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

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
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.
  • All Info
  • Reviews (432)
  • Q & A (0)
  • Photos

Optronics Trailer Lights - STL9RB

  • Tail Lights
  • Square
  • LED Light
  • Red
  • 5L x 5W Inch
  • Surface Mount
  • Submersible Lights
  • License Plate
  • Rear Reflector
  • Side Marker
  • Side Reflector
  • Stop/Turn/Tail
  • 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   (432 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.


Beautiful tail light. Very bright for the brake and turn signal. Fitted it on the back of my trailer with an L bracket.


Rebuilding a used trailer with no idea what axles it had. Contacted customer service and they walked me through getting the right brake kits, bearings, and hubs..excellent customer service


All new wiring on a trailer rebuild. These junction boxes make the job so much easier and faster. Now when i troubleshoot wiring issues im chasing one wire at a time. Oh and now the wiring goes in a location that works for me


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.


Tired of dealing with corroded bulbs so bought these LED units. Same 2" bolt spacing as old one so easily mounted. Spliced wire connections and works great. Super bright! Will see how it holds up to weather. Hopefully will never have to touch it again.


First set of submersible trailer light that have lasted the rigors of salt water. Highly recommend this product


Easy to install, bright, and didn't come with extra hardware that I wasn't going to use.


This was a direct replacement for broken (by me) part. The part was exactly as expected. Very easy to order. The delivery time was great ---ordered on Thurs and delivered on Saturday (vs. estimate of Tuesday.) Thank you.


My mistake, thinking they were identical and reversible. That is why they specify drivers and passenger side. Ordered another one and will be all set.


Very slow delivery.


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 . . . . . :-


Good products. Fast shipping.


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.


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


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.


still the wrong part, your picture of this part shows a base (where the hole is) shows 3" the one you sent is 2". confusing. need 3" base.




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.


Exactly what I ordered, very simple and bright!


It is the correct item


Great lights. Nice and bright


worked great


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


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.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Lights on 1999 Magic Trail Trailer By Magic Tilt Do Not Work
    SAE is correct, it stands for Society of Automotive Engineers. The SAE followed by numbers and letters is a lens rating. LED lights are usually sealed or the LED module itself will be sealed. They can burn out but it would either take a long time or an event such as a bad short to cause them to burn out. You might actually have a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function...
    view full answer...
  • Can a Passenger Side Tail Light Be Used on the Driver Side of a Trailer
    Left side tail lights have a clear lens on the bottom to light up the license plate. Right hand side tail lights do not. If you were to use the right hand side light, # STL8RB, you would need a separate light to illuminate the license plate. The left hand side light that matches is # STL9RB. If you click on the last picture on the product page, you will see the lens.
    view full answer...
  • What are the Functions of the Wires of a Trailer Taillight that Has Red, White and Black Wires
    For trailer taillights that have the three wire colors you mentioned the white wire is the ground, the black is the taillight and the red is the turn signal/brake light.
    view full answer...
  • Recommendation For Matching Driver And Passenger LED Trailer Tail Lights
    The driver side tail light that matches Item # STL8RB is Item # STL9RB. This trailer light is the same as # STL8RB but has additional functions related to the driver's side. It has the added function of license plate light. Additional information and videos attached.
    view full answer...
  • Will My 2021 Ram 1500 Laramie With LED Lights Be Able To Tow My Trailer With Incandescent Lights
    When towing with your 2021 Ram 1500 and your trailer has incandescent lights, The LED lights require less power then the incandescent lights. With that being said I would switch out to The Combination LED Trailer Tail Light # STL8RB and The Combination LED Trailer Tail Light # STL9RB. These LED lights will make great replacements for incandescent lights. They last 50 times longer and are more efficient and provide better light with less power output. The lights have a waterproof construction...
    view full answer...
  • Installing LED Lights On Trailer Connected to 2003 Dodge Dakota with Incandescent Lights
    The 2003 Dodge Dakota does not have a converter box as a part of the trailer wiring. Here is where confusion comes in and where ambiguity comes. Some LED lights may have zero issue plugging directly into the system based on the trailer length, ground connections, and number of LED's in each light fixture. Due to enough power draw. Other trailers may not have enough power draw and may have hyperflashing issues requiring load resistors either on each line or through a converter like #...
    view full answer...
  • LED Trailer Taillight Replacement Recommendation
    LED lights are more durable and can withstand more than incandescent bulbs. Regular bulbs are pretty fragile by comparison. That is not to say that the LEDs are indestructible but they will hold up better than regular bulbs. I attached a page that has all of the LED trailer taillights we offer that could possible fit. The part # STL8RB and # STL9RB are very popular options that you might consider. I attached an install video for these lights for you to check out as well.
    view full answer...
  • Submersible Right Hand LED Trailer Tail Light Recommendation
    If you want a submersible tail light I would recommend the LED Submersible Trailer Stop, Turn and Tail Light, 6-Function, 11 Diode, Right Hand, part # STL8RB. The # STL28RB you referenced is not submersible, and I would not recommend it if you need a submersible tail light. You may also be interested in the LED Submersible Trailer Stop, Turn, Tail and License Plate Light, 7-Function, 14 Diode, Left Hand, part # STL9RB, if you needed the left hand version of the # STL8RB.
    view full answer...
    Image 1 for
  • Are The Optronics LED # STL8RB and # STL9RB Compatible With Light Guard # LG440NP?
    The Redline Light Guard - Unpainted Steel for 440 Tail Light, # LG440NP, has an inside dimension of 5-1/2 wide x 5 high x 3 inches deep. It is designed to fit the Peterson Square Trailer Tail Light, 6-Function, Right Hand, # 432200 and the Peterson Square Trailer Tail Light, 7-Function, Left Hand, # 432400, but it will fit other lights. The Trailer Tail Light - 6-Function - LED - Submersible - 11 Diodes - Red Lens - Passenger, # STL8RB and the Trailer Tail Light - 7-Function - LED - Submersible...
    view full answer...
  • Left Side Boat Trailer Tail Light Does Not Have Power when Bulb is Installed
    The most likely problem is going to be a bad ground. Without the bulb in, there is no draw on that light and ground issues normally show up when there is a load on the system. If you recently install a plastic license plate holder in between the light housing and the trailer frame, that can cause this problem (if the lights ground through the mounting studs). The solution will be to run jumper grounds (no matter how the lights ground to the frame) to the main trailer connector ground....
    view full answer...
  • Left Handed, Submersible Trailer Light and License Plate Bracket Recommendation
    What you will need is a Over 80 inch Wide, Square Submersible Trailer Tail Light with License Plate Light, 8-Function, Left, part # ST5RB. For a license plate bracket you will need a Trailer License Plate Mount Bracket, Angled, Rust Proof Polymer - Black, part # LP10SB. If you need a right handed light, you would want a Over 80 inch Wide, Square Submersible Trailer Tail Light, 7-Function, Right Hand, part # ST4RB. The reason I recommend a different Tail Light from the one you referenced...
    view full answer...
  • Driver Side Taillight to Match Optronics # STL8RB
    For the matching driver side light with the # STL8RB that you referenced we have the part # STL9RB which is the correct part. Both have 2 inches between the mounting bolt centers.
    view full answer...
  • Wiring And Light Recommendations For Small Utility Trailer
    If you want to install a new 4-way connector on your utility trailer I recommend using something like part # A35W42B. This is a 35 ft 4-way wiring harness. I have attached a link to a helpful article that explains trailer wiring you can check out. For trailer lights I recommend using LED lights. they are very durable and raw much less power than incandescent lighting. For the right hand side of the trailer I recommend a light like part # STL8RB. This is an 11 diode light that features...
    view full answer...
  • Replacement Driver Side Taillight Assembly for Trailer Taillight Kit TLL9RK
    For a replacement driver side taillight for the # TLL9RK you'd want the part # STL9RB which is an exact replacement.
    view full answer...
  • Driver's Side LED Tail Light That Matches Optronics Combination LED Trailer Tail Light
    The correct Combination LED Trailer Tail Light that goes with the Optronics # STL8RB is the part # STL9RB like what you were talking about. The reason why it has that extra function and the extra diodes is because there is a clear light/lens on the underside of that light which is used to illuminate a license plate. You can definitely upgrade your incandescent lights to LED. This is becoming more and more common simply because LEDs last longer and typically burn brighter so they are...
    view full answer...
    Image 1 for
  • What Gauge Wire on Optronics LED Combination Tail Lights STL9RB and STL8RB
    The Combination LED Trailer Tail Light - Submersible - 6 Function - 11 Diodes - Passenger Side # STL8RB and # STL9RB has 16 gauge wires. You will want to use connectors like the Deka Butt Connector - 16-14 Gauge - Qty 5 # 05731-5.
    view full answer...
  • How to Wire Optronics Right Hand LED Trailer Lamp # STL8RB
    The Optronics LED Trailer Stop, Turn and Taillight you referred to, part # STL8RB would install on the right or passenger side of the trailer and would wire as follows: The white wire would ground to the metal trailer frame The brown wire would connect to the running light circuit The green wire would connect to the right turn/brake lamp circuit. The # STL9RB would install on the left side of the trailer, and would wire as such: White wire grounds to trailer frame Brown wire connects...
    view full answer...
  • Recommended Replacement Trailer Lights With Side Lights For Small Utility Trailer
    We have just what you are looking for. I recommend the LED Submersible Trailer Stop, Turn and Tail Light, part # STL8RB. This is for the right side of the trailer and is a stud mounted LED light. It has the side marker light that illuminates when the running lights are powered. For the left side of the trailer you will want part # STL9RB. I have attached a product review video and have also attached a drawing that shows the dimension for these lights you can take a look at.
    view full answer...
    Image 1 for
  • Looking at LED Submersible Trailer Light # STL8RB and Need Part Number for Driver's Side Light
    When it comes to the LED Submersible Trailer Light, # STL8RB, you will need part # STL9RB for the driver's side. I have attached a short video for you.
    view full answer...
  • Availability of Stud Mounted Round LED Trailer Taillight
    Unfortunately, Peterson doesn't offer an LED version of the stud mounted # 431800 lamp you mentioned. For an LED stud mount lamp, I'd recommend the Optronics # STL9RB and # STL8RB. These lamps are a bit larger, and square, but they are a stud mounted LED taillight.
    view full answer...
  • What is the Difference Between Trailer Lights # STL9RB and # TLL9RK
    The difference between the LED Left Hand Trailer Light, # STL9RB, and the Trailer Light Kit, # TLL9RK, is the fact that one is an individual light and the other is the light set with license plate bracket. Part # STL9RB is the left hand stud mounted LED tail light. Part # TLL9RK is a packaged kit which includes 2 LED stud-mount tail lights, # STL8RB and # STL9RB, and a corrosion proof license plate bracket.
    view full answer...
  • Lens Replacement Recommendation for Optronics Light STL8RB
    Yes we carry replacement side lenses for the part # STL8RB and # STL9RB. For that you would want the part # AL9RB. For a replacement front lens you would want the part # A8RB. I was able to check your order notes to determine that you ordered the # STL8RB.
    view full answer...
  • Right Hand Tail Light Goes Out When Vehicles Headlights Are On
    I am assuming that you mean the right hand trailer tail light goes out when you turn the headlights on in the vehicle. If that is the case then this sounds like a ground issue. In order to remedy this you are going to need to reground each tail light assembly and both the vehicle side and trailer side trailer connectors. The tail light assemblies will ground via a single wire or the mounting hardware. If they ground with a single wire then you will want to remove the wire, sand down the...
    view full answer...
  • Quantity of Lamps Included with Optronics LED Trailer Taillght STL8RB
    The Optronics Trailer Taillight # STL8RB is the passenger side taillight only. The driver's side taillight is sold separately as part # STL9RB. If you click the provided link, you can see a video showing these lamps being installed.
    view full answer...

< Previous
123. . .4

Do you have a question about this Trailer Light?

Info for this part was:

Employee Robert G
Expert Research:
Robert G
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Sarah H
Expert Research:
Sarah H
Employee Adele M
Updated by:
Adele M
Employee Laura H
Updated by:
Laura H
Employee Amy B
Updated by:
Amy B
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Kathleen M
Video by:
Kathleen M
Employee Zach D
Video by:
Zach D
Employee Dustin K
Video Edited:
Dustin K
Employee Chad S
Video Edited:
Chad S
Employee Cole B
Installed by:
Cole B
Employee Randy B
Installed by:
Randy B

At 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. Let us know if anything is missing or if you have any questions.