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Combination LED Trailer Tail Light - Submersible - 6 Function - 11 Diodes - Passenger Side

Combination LED Trailer Tail Light - Submersible - 6 Function - 11 Diodes - Passenger Side

Item # STL8RB
Our Price: $18.94
Trailer Lights
Shipping Weight: 0.55 lbs
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5-1/16" x 4-9/16" Square. Waterproof trailer light serves 6 functions: stop, turn, tail, rear reflex, side marker, and side reflex. 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 - 6 Function - 11 Diodes - Passenger Side part number STL8RB can be ordered online at or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - STL8RB

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

5-1/16" x 4-9/16" Square. Waterproof trailer light serves 6 functions: stop, turn, tail, rear reflex, side marker, and side reflex. Durable plastic housing. Stud mount on 2" centers. 3-Wire design.


  • Square trailer light serves 6 functions
    • Stop light, turn signal light, tail light, rear reflex reflector, side marker light, and side reflex reflector
  • 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: passenger's side
    • Driver's side: STL9RB (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: 11
  • 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.

STL8RB Optronics Combination LED Taillight for Trailers Under 80" - Red lens - 11 Diodes

Replaces STL8R3B

Alternate part number: STL8-RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Combination LED Trailer Tail Light - Submersible - 6 Function - 11 Diodes - Passenger Side - STL8RB

Average Customer Rating:  4.8 out of 5 stars   (523 Customer Reviews)

5-1/16" x 4-9/16" Square. Waterproof trailer light serves 6 functions: stop, turn, tail, rear reflex, side marker, and side reflex. Durable plastic housing. Stud mount on 2" centers. 3-Wire design.


So far so good I have had these lights on for over a year now and have forgotten several times to unplug when launch or retrieving the boat it doesn't seem to effect the lights as they still work fine. Stop and signal is not that bright in daylight but shows up fine in dusk or night. It could be my angle of the trailer that causes this.


E trailer always gets my orders shipped quickly and correctly.


Great product for my flatbed l.e.d upgrade lights feel of good quality .easy ordering and shipping


This LED trailer light has performed flawlessly over the year its been installed. The LED'S are bright day or night, and the lense has held up well in the SW desert environment its exposed to. Highly recommended.



The trailer light has been installed for 2 years now, and continues to functions flawlessly. The trailer is out in the SW desert environment and has shown no negative effect from the weather at all. A great product that works well.


As usual, good variety, good prices, good product and fast delivery.



It is nice to have them come on every time I plug in. No corroded bulbs to mess with.


have not needed to install yet; decent price; was available


etrailer has always been good to me
on returns


fine light, just as advertised, works g reat


Very Happy with this Item.


Great lights! Nice and bright


My Phone call to etrailer answered all my questions on these lights before I placed my order. shipping was right on time.(5days)

This light is a great up grade to the stocks lights that came with my new "Trailer in a Bag". I am looking forward to these LED's working well with all the bouncing road punishment a small trailer has.
I will report again once I have put on 500 trailer miles

I will report again once I have put on 500 trailer miles " />


These lights were very easy to install,they look and work great,would recommend them for your trailer lights.


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


Sending you a pic of my lights I got from you and the hitch with the full wiring system. All works great. Thank you so much. Now it's time to go riding!!


Great quality for the money, easy insta l.


Still working great after one year on my off-road trailer.


Bought a set of these for my boat trailer. install was easy and look great


This is the second pair that I have purchased for a PWC and dirt bike trailer. They are excellent. One of the lenses in the first pair was defective. I called Optronics and they immediately shipped me another. Excellent Tech Support. The lights are very bright and so easy to install. Be sure and secure the ground wire to the trailer frame against raw metal (un-painted and freshly ground), or the lights will not perform properly. Also, the washer provided goes on the fixture side of the trailer mount. Locking nuts secure the light on the opposite side with no washer.

Steve W.


I have since bought two more for my dirt bike trailer. These taillights are exceptional. They are very well made, easy to install and provide BRIGHT red light. I did have to return one of the lights which was defectivenew. You replaced it right away and I have had no further issues. I would highly recommend. Wish you had lights for my Toy FJ40LandCruiser.....


Easy install and works great


I ordered the trailer lights on Mon and received them on Thursday. It took about a half hour to install them only because I had to drill holes for the ground wires that the other lights did not have. They are brighter than anticipated and work great. The old ones worked, but you could barely see them except at night. I am very pleased with the product and service (as usual). I have ordered a number of items from e-trailer and will continue to do so. The only problem was that I couldn't find the left hand light. When I called, they had the number for it instantly. Great service and speedy delivery. What more can you ask for. Thanks again.

Don K.


These lights still work just like new I buy all my parts from etrailer and will continue to do so. The prices are cheaper than from my local big box hardware store.


These led's are better than several others I have tried, which all failed in a matter of weeks when exposed to saltwater. It has been about a year and all 20 of the main LED's (10 each light) are still working. However, the side marker lights both failed within a month or two. The lights should probably get 3 stars since the side marker lights failed quickly. Considering that 2 other sets (different brands) began failing one LED at a time immediately upon saltwater exposure, these have been far better, hence the 4 stars.



After one year all 20 of the main LEDs 10 each light still work. The side marker lights failed quickly. In total, these have held up much better to regular saltwater exposure than other brands.


easy installation. led, gotta love the brightness!!


Excellent product at a great price.


Product is just as described. Fast economy shipping with tracking. This was my first experience ordering with etrailer. It is very nice to know that there are companies still in this world that make customer service a priority. Etrailer has definitely won my business and I will be ordering more from them.



Still working great. Still look brand new.


A great replacement light for standard incandescent tail lights at a reasonable price and these are so much brighter than stock. Installation was a no brainer and took less than a half hour as the bolt pattern is standard and the wires are as well.
Customer service is what sets this retailer apart from the rest!



After a year and 5000 mi. I had forgotten about these lights. Thats what a good light should be, something you never have to worry about. These lights are just that!

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Difficulty Replacing Lens on Optronics LED Tail Lights
    I contacted our representative at Optronics about replacing the tail light lens on your Optronics LED tail light lens. Optronics has made a change in the way the # STL8RB and # STL9RB LED Lights are made, now the lens and the LED diodes are all one piece. You would need to replace the entire light assembly as you can no longer replace the lens. The smaller sidemarker lens on the tail light assembly is replaceable, but the main tail light lens is not.
    view full answer...
  • Installing New 4-Way on Trailer that Uses Non-Standard Colors
    Best option is going to be to take a jumper wire from a positive battery post and jump 12 volts to each of the wires you have on your trailer and note what functions turn on and then wire the new 4-way accordingly as it sounds like your trailer uses non-standard colors which is making things difficult. If one sparks it's the ground circuit. So the white of the new 4-way goes to ground, brown to running lights, yellow to left turn/stop, and green to right turn/stop. I also attached a link...
    view full answer...
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  • Can RV with LED Taillights Tow Trailer with Incandescent Bulbs
    Yes, your RV that has LED taillights will work fine towing a trailer that has incandescent bulbs. The trailer wiring setup of your RV was designed to be able to handle the higher amperage load of incandescent bulbs as it would not draw power from the taillight circuits. Instead it uses the taillight circuits for signal wires and then draws power directly from the battery.
    view full answer...
  • Trailer Lights Flicker After Installing New LED Lights and Rewiring a Car Hauler Trailer
    You have definitely taken all of the correct steps so far. Since you are still experiencing problems after the rewire and installing new lights, I would suspect a ground problem. Especially since you were careful not to pinch or damage any of the new wires. Rust and corrosion can often show up at ground locations where the wires make contact with the metal. If you used any of the original ground screw holes, I recommend moving them to a clean bare surface on the trailer frame and scrape...
    view full answer...
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  • Will the LED Submersible Trailer Stop, Turn and Tail Light # STL8RB work on a EZ Load Boat Trailer
    It sounds like the two wires on your trailer wiring are for the stop/turn and tail light functions and the ground is through the mounting hardware of the light assemblies. The # STL9RB and the # STL8RB should still work well for you. You will just need to ground the white wire so that everything will function. Check out the review video for this video I attached and the FAQ article on trailer wiring.
    view full answer...
  • How to Ground the LED Submersible Light part # STL8RB
    The LED Submersible Light part # STL8RB that you referenced would work perfectly for you. You would match the brown and green color wires of the assembly to the brown and green wires of your trailer and then would run the white wire to a clean metal surface that touches your trailer frame. This is the ground circuit. Your old light assemblies probably grounded through the mounting hardware. If so, you could just put the ring terminal of the white wire on one of the mounting studs of the...
    view full answer...
  • Troubleshooting Running Light Circuit of Trailer Blinking with Turn Signal
    Running lights should not be affected by the blinkers or stoplights of the trailer. What you described sounds like a weak trailer wiring ground which you can improve by cleaning up the ground circuit of each of the light assemblies or even running a jumper wire for the ground circuit back to the main harness of the trailer. You also can try cleaning the pins of the trailer wiring connectors as well. I also attache a really helpful link to a trailer wiring troubleshooting article.
    view full answer...
  • Turn Signals on Trailer Work Opposite of Truck With Brake Applied
    What you describe is a classic symptom of a insufficient ground connection. Then there is minimal amperage running through the system, everything works fine but with the brake signal thrown in, more power is running through which is when the problem will rear its head. Make sure that the trailer connector's ground point which is usually on the trailer tongue is secure and not corroded, and is making direct contact to clean metal on the trailer tongue or frame. Check each lamp to make...
    view full answer...
  • Both Trailer Turn Signals Flash When Tow Vehicle Headlights are On
    What you describe is a classic symptom of a poor ground connection. Everything works okay until you turn on the vehicle's headlights or running lights, then things get interesting. When the headlights are on, the wiring for the lighting on the trailer is under full load which is when a problem will show itself. The trailer connector ground should be securely attached to the trailer tongue, to clean bare metal. Remove the ground screw or bolt and sand down a dime-sized area around the hole...
    view full answer...
  • Are Load Resistors Required When Converting Trailer to LED Lights
    Converting trailer lights from incandescent bulbs to LED does not require the use of a load resistor. For example, the part # STL8RB would fit and work well without any type of load resistor.
    view full answer...
  • Trailer Taillights Act Up When Vehicle Headlights are Turned On
    It sounds as if you're experiencing a classic symptom of a poor ground connection. A ground connection problem can make a taillight system do all sorts of things, but the dead giveaway in your case is that the problems get worse when the vehicle headlights are turned on which is when the maximum amperage draw occurs. Locate the white wire that extends rearward toward the rear of the trailer from the connector. This wire will ground to the trailer frame, usually on the trailer tongue and...
    view full answer...
  • Troubleshooting Trailer Light Assembly that Doesn't Get Brighter with Blinker/Stop Light
    Sounds like the brighter stoplight/turn signal function of your taillight isn't working. This is typically caused by the running light circuit of the trailer wiring being ran to the stop/turn circuit of the light wiring. Make sure the stop/turn circuit is ran to the green wire (if you have the STL8RB) and not the brown wire which would be the running light circuit. Also verify that the stop/turn circuit is making it back to the assembly and that a short isn't taking preventing the circuit...
    view full answer...
  • Troubleshooting Led Light Turn Signal Flashing Both Sides Only When Headlights Are On
    With your trailer lights, the headlights changing the function of the other lights most likely means you have a ground issue on your trailer. You will want to make sure not only the trailer light # STL8RB has a bare metal to metal ground at the ring terminal on the white wire without any corrosion or debris (even paint can be an issue), but you will also want to make sure your main trailer ground is bare metal to metal with no corrosion as well. Next check the ground on your trailer wiring...
    view full answer...
  • What Could Cause LED Light Bars to Turn Off and On When Bumped
    Try jiggling the wiring that runs to the lights first. Hopefully that causes the lights to come on or off and the issue is as simple as a wiring connection that's not fully secure. If that's not it and it's an LED setup the solution will be to replace the assemblies as it's a loose wire somewhere in the diodes.
    view full answer...
  • Troubleshooting Trailer LED Turn/Stop Lights Not Working with Headlights on
    There are 2 possible reasons why your LED lights aren't working when you turn your headlights on; the first (and more likely) is that you have a bad ground or grounds, and the second is that you have too many LED lights on your trailer. Start off by checking all of the grounds connected to the lighting on your trailer. Make sure they are all securely connected to a clean, bare-metal surface. Also check the pin for the ground on your trailer connector while you're at it. I have attached...
    view full answer...
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  • Installing Clearance Lights For Both Running And Turn Signal Functions
    To have both clearance and turn signal/side marker you need to have a 3 wire light like the Miro-Flex LED Trailer Side Marker Light and Mid-Ship Turn Signal - Submersible - Amber Lens # MCL48AB. If your LED lights have two wires, you will need to choose between the turn signal or running/park lights.
    view full answer...
  • What Would Cause Trailer Wiring To Flash or Blink When Hitting Bumps in Road
    Your trailer lighting is flickering because the wiring of the trailer is grounding through the hitch ball and coupler and not through the ground wire circuit. When you hit a bump the ball intermittently stops making contact with the coupler which stops the lights from working. What you can do try improving the ground wire that comes from the main harness of the trailer to the frame and you should see it start working normally.
    view full answer...
  • With Turn Signal and Brake Lights On All Trailer Lights Flash when Connected to 2007 GMC Yukon
    It sounds like there may be a ground problem or a possible overload. Ground problems and overloads 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 like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should...
    view full answer...
  • Troubleshooting New LED Trailer Tail Lights Not Working as Running Lights
    If I understand correctly it sounds like the new red tail lights on your trailer aren't powering on with the running lights circuit, but the amber lights are. You appeared to have wired everything correctly so that the red lights function as turn/brake signals. If these functions aren't working either, please let me know. If the red tail lights also need to serve as running lights then they will need to be wired to the brown wires from the wishbone harness on each side of the trailer...
    view full answer...
  • Trailer Clearance Lights Blinking with Turn Signal
    It sounds like you might be getting some bleed-over from the turn signals occurring in the trailer connector. Take a look at the trailer connector, and check the plug for corrosion in the sockets. If you see any green or white corrosion in the sockets, then there is a good chance it has spread to the interior of the connector, to where the wires attach to the plug terminals. Once this corrosion starts building up, it can actually contact adjacent terminals and cause signal bleed-over. You...
    view full answer...
  • Replacement LED Submersible Tail Light Recommendation for One that Fell Off
    The LED Submersible Trailer Stop, Turn and Tail Light # STL8RB that you referenced would work as a replacement right-hand (passenger side) trailer light. This light attaches with the mounting studs on the back of the assembly with the included nuts. I attached a review video and an FAQ article on trailer wiring for you to check out as well. If your trailer lights look differently than the # STL8RB email me back with a picture and I'd be more than happy to help you.
    view full answer...
  • Troubleshooting Trailer Lighting on Side of Trailer that Is Much Dimmer for Stop/Turn
    The ground for the light assemblies on the left side of the truck is weak which is preventing them from being able to illuminate fully. Try improving the ground and you should see them work again. You can run a wire from the assembly back to the main ground of the trailer or you can clean where the trailer light attaches to the frame and that will help as well.
    view full answer...
  • Troubleshooting Trailer Right Blinker that Flashes All of Trailer Lights
    Sounds like your right turn/stop circuit is shorted out to your running light circuit which is causing all of your trailer lights to flash when you apply the right turn signal. Most likely this is due to exposed wire between these two circuits on the trailer wiring. You'd have to go over the wiring of the trailer looking for that and fix as needed.
    view full answer...
  • Recommendation to Add Extra Right Tail Light on Trailer
    To add an extra tail light to your trailer, I recommend using a Trailer Tail Light like the Optronics # STL8RB. This light will give you stop light, turn signal light and tail light functions and will mount to any surface using the included studs. You will simply splice the wires into the existing tail light wiring of your trailer. The white wire will be grounded, the brown wire is for the tail lights and the yellow wire is for the stop and turn lights. I have attached a video review...
    view full answer...

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