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LED Combination Tail Light Kit for Trailers under 80" Wide - Submersible - Driver and Passenger

LED Combination Tail Light Kit for Trailers under 80" Wide - Submersible - Driver and Passenger

Item # TLL9RK
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TLL9RK - Submersible Lights Optronics Tail Lights
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Waterproof trailer light kit includes 2 combination tail lights that serve 7 functions on trailers under 80" wide. Stud mount with stainless steel hardware and included license plate bracket. 25' wiring harness with 4-pole connector. Lowest Prices for the best trailer lights from Optronics. LED Combination Tail Light Kit for Trailers under 80" Wide - Submersible - Driver and Passenger part number TLL9RK can be ordered online at or call 1-800-496-5010 for expert service.
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Optronics Trailer Lights - TLL9RK

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

Waterproof trailer light kit includes 2 combination tail lights that serve 7 functions on trailers under 80" wide. Stud mount with stainless steel hardware and included license plate bracket. 25' wiring harness with 4-pole connector.


  • Square combination tail lights serve 7 functions when properly mounted on trailers under 80" wide
    • Stop, turn, tail, side marker, side reflector, rear reflector, and license plate light
    • Built-in license plate light on driver's side light
  • Sealed, waterproof construction is submersible
  • Durable surface-mount diode (SMD) construction of LED circuit board
    • Better withstands shock and vibration
    • Allows for improved heat distribution
  • LEDs make great replacements for incandescent lights
    • No bulbs to replace
    • No brittle filaments
  • Corrosion-resistant license plate bracket
  • Durable polycarbonate housing and acrylic lens
  • Red lens over clear LEDs
  • Stud mount
    • Stainless steel mounting hardware included
  • 25' Wiring harness with 4-pole connector
  • DOT approved


  • Application: trailers under 80" wide
    • Driver side: STL9RB
    • Passenger side: STL8RB
  • Light dimensions: 5-1/16" long x 4-9/16" tall x 2-5/8" deep
    • Light face: 4-9/16" x 4-9/16"
  • Distance between mounting studs (center on center): 2"
  • Diodes:
    • Driver's side: 14
    • Passenger's side: 11
  • Power draw at 12.8 volts:
    • Stop and turn lights: 0.259 amps
    • Side marker lights: 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.

TLL9RK Optronics LED Combination Tail Light Kit for Trailers under 80" Wide - Submersible - Driver and Passenger - 25 Ft Harness - Stud Mount

Alternate part number: TLL-9RK

California residents: click here

Customer Reviews

LED Combination Tail Light Kit for Trailers under 80" Wide - Submersible - Driver and Passenger - TLL9RK

Average Customer Rating:  4.8 out of 5 stars   (376 Customer Reviews)

Waterproof trailer light kit includes 2 combination tail lights that serve 7 functions on trailers under 80" wide. Stud mount with stainless steel hardware and included license plate bracket. 25' wiring harness with 4-pole connector.


All went well except the ground wire was short on the trailer harness, had to splice a piece in.
Manufacture should consider making it another 12-18 inches longer.

Working great!
Charles - 11/15/2021


The TLL9RK Optronics LED Combination Tail Light Kit fit my old 4 foot by seven foot utility trailer perfectly. The lights are much brighter than the OEM incandescent units. I used crimp connectors instead of those supplied in the kit. I like the plugs that came with the new wiring harness, as they appear to seal much better when the trailer is connected to the tow vehicle. I only wish the kit included a blanking seal for each plug to help keep them clean and dry when not connected, as they spend most of their time unplugged and open to the weather.


Love the lights. I would give them five stars all day long. The wiring harness is a bit chintzy. More like 2.5 stars. It feels like if the manufacturer spent another .02 on it the quality would be better. If you paint your trailer, you need to grind away the paint beneath the ground wire, otherwise they will not work.


Easy to install. There was plenty of length of wire to make the connections. Work great and looks great. Thank you.


etrailer needs better info on mounting hole matching brackets and the components meant to be mounted


It was easy to determine from the catalog what product I needed. The product met expectations- with the exception that the grounding wire was 1-1.5" too short. The problem was solved by adding more wire. Delivery was timely.


They work as advertised. My trailer sees regular use and is stored outside year round in the midwest. I haven't had any issues.

Lights are still working great over a year later!
Brandon - 05/21/2022


Rebuilt an old boat trailer. Had it powder coated and I needed a whole new light harness. This worked really well and looks good too.


The fenders I ordered were exactly what they said they would be. The dimensions were right on the money. They were solid and sturdy with great craftsmanship and looked great after paint was applied. I also ordered the square light kit and was of good quality.


Very neatly packaged. Ground wire should have been twice the length that it was. Otherwise a good product


I’ve used etrailer before and was pleased. This time was no different. Excellent service and quality.


Easy to install and works very well. I just wish the grounding screws were bolts instead of self tapping screws. They would not work on my trailer frame so I just used some other bolts I had and they worked fine.


Great LED lights!


Lights work great, look great,


Still performing well, no issues from the lights. No problems with initial install or operation on trailer. Etrailer is excellent source for all towing and truck accessories.


The product is exactly what was listed on the website and the quality is great. I looked at Walmart, a local marina and a local part store for trailer lights. These lights I got from are better quality and a better price including shipping. It was delivered faster than expected. I was so pleased, I purchased more product from etrailer the next day.


Bought this product to replace my incandescent lights on my boat trailer with led lights. Price was right. I have not installed them yet but I'm sure they will work fine as with anything I've purchased from etrailer so far.

I installed the Led Lights on my Trailer and they work Great.. The led lights are much brighter then the incandescent lights. I placed my lights on the back of the trailer where they do not get submerged when ping off my 17 FT Boston Whaler.. I do not need the back my trailer in the water all the way.. I usually back the trailer where the water is just below the hub bearing..Will definitely recommend this trailer light kit to anyone looking to replace their lights led lights and wiring.
Joseph P - 06/27/2019


Seamless transaction and gorilla-with-a-crayon installation instructions. Simple and smooth... doesn't get better than that. Phooey, I even got to talk to a real-live-helpful person!. And the box arrived like magic on my porch like a package under the Christmas tree. Would I do it again.... I already did, with another order. And I'm talking to others about my good experience.


I purchased this kit to replace the existing setup on my 4' x 8' utility trailer that had served me well for about 15 years. I was having problems with blown fuses when I turned the vehicle headlights on, and then when I used the turn signals as well. It was pretty clear that my problems were coming from the old light fixtures, but I decided to go ahead and replace the whole wiring harness at the same time since the extra expense was nearly insignificant. This kit came with almost everything needed to complete the job. I added some 1/4" corrugated wire wrap to help protect the wires from abrasion, and a few waterproof heat shrink tubes to seal the connections (2 for each light, & 1 for the ground wire). I chose to solder my connections and then seal them with the waterproof heat shrink tubes. There was enough room inside the light fixtures to enclose the connections and keep them out of the weather. The whole process of removing the old lights and wiring, and then installing the new components took about two hours of leisurely work in the back yard. It was an easy process, and the new lights are much brighter and more reliable now. No more blown fuses. They have the added advantage of drawing very few amps as compared to my old incandescent fixtures. I think it was well worth the little extra cash to invest in the LED lights. The kit included a flat 4 wiring harness to connect to the vehicle, which made my neighbor happy when I gave it to him - my truck was already wired for a 4 flat connection. In all, this was the most recent of my 3 or 4 purchases from, and I will certainly be back for more. The prices are good, shipping is fast, and there is wealth of instructional information to consume.


After struggling with corroded connections on the original lights, it's was time to redo them from one end to the other on my utility trailer. This kit did the trick!
Bright lamps! No more faulty contacts or replacing bulbs! Clean wiring throughout!
Tip: Squirt some silicone or RTV in the crimp connectors for a water tight seal.

The only CON is that there weren't really enough stainless wire clips to keep everything right sms tidy. Fortunately, I had some add'l ones. I'll bet if you asked George, he'd send some more!


Exactly as described. Quick delivery. Easy installation. Works great and very visible.


Very fast shipping & nice product.


I installed the Trailer Light Kit this past weekend on my motorcycle/utility trailer.
The good: the lights themselves seem to be of good quality and are quite bright, just what I was looking for as replacements for my existing lights. Also, the wiring seemed fine as well.
The 'bad': The hardware that came with the kit was pretty much useless. It came with some miniscule wire nuts which I found rather odd since the lights in this kit are 'submersible'. I bought some butt connectors- weather proof with heat shrink covers instead from an autoparts store. Also the clips that came with the hardware could only be used on a trailer made with angle metal as they push onto one side of the angle. My trailer is made from square tubing so I had to procure loom cushion clamps that utilize a screw to attach to the tubing. Loom clamps would work on either so I would suggest they be included in the hardware kit.
I would have given the kit a 5 had the hardware been decent as the wiring and lights seem fine.


Great light kit. Very easy to install. LEDS are crazy bright compared to my old trailer lights. Now I can use the boat ramp to unload my kayaks. Instead of dragging them to the water.

Still working great. If only the squirrels would stop chewing the wires apart. Thanks again for a great product.
Tommy N - 09/10/2018


Excellent customer service, fast accurate shipping, super price! Two new wheel tire assemblies and a light kit, delivered in two days....made pick up of my 1971 Mariner 2 + 2 in Baltimore possible! Thanks guys!

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Can LED and Incandescent Trailer Lights both Be Used at Same Time
    A trailer can very easily have incandescent and LED lights at the same time. There is no issue mixing the two styles of lights. If you added the trailer lighting kit part # TLL9RK that you referenced to your trailer you'd have no problems at all. I attached an install video for this kit for you to check out as well.
    view full answer...
  • Do LED Trailer Taillights Cause Issues for Dodge Ram Truck
    If you install LED trailer lights you will be just fine. The only time LEDs cause issues for vehicles is if the LEDs are getting installed on the blinker circuits of the tow vehicle or if the vehicle is a German vehicle and the trailer taillights are LED. For your situation you'd have nothing to worry about installing trailer LED lights like the # TLL9RK.
    view full answer...
  • Troubleshooting Dim LED Tail Lights On One Side Of Boat Trailer
    Many times the issue with a dim light on one side or the other is caused by a poor ground connection. You will want to inspect all of the ground locations as well as the ground wires coming from each light. Check for loose connections or pinched or bare wires. Since you said it is a submergible light, check to make sure the light housing has not been damaged and no water has managed to get inside the housing. If the lights on your trailer use a plug-in style pigtail harness look for damaged...
    view full answer...
  • Should Trailer Running Lights Be Dim
    Typically the running light circuit will be noticeably dimmer than the brake/turn signal circuit, so what you described could be normal depending on how dim the lights are. Without seeing how dim the lights are it's hard to say for certain. If you installed the # TLL9RK that you referenced you can check out the review video I attached around the 1:30 mark to see the difference in the brightness of each circuit. I also attached a picture that shows the running light circuit on the right...
    view full answer...
    Image 1 for
  • Can LED Trailer Light Kit part # TLL9RK be Backed Into Water on Boat Ramp
    The submersible LED trailer light kit part # TLL9RK is designed to be backed into water like when installed on a boat trailer. We still recommend unplugging the trailer wiring just because water and electricity don't like to mix well. We are aware that a lot of people leave them plugged in without any issue.
    view full answer...
  • Troubleshooting Right Blinker Taillight of # TLL9RK Not Functioning on Trailer
    When a single trailer taillight doesn't want to function the issue is almost always related to the ground of the assembly. What you'd want to do is check the condition of the ground and fix as needed. If you have the # TLL9RK kit that you referenced it grounds through the white wire of the assemblies that normally get ran to the trailer frame. What you can do is run that white wire either all the way back to the main ground of the trailer wiring harness or find a better place to install...
    view full answer...
  • Brakes Lights on Trailer Don't Work But All Other Light Functions Work
    The issue you are seeing with the lights on your trailer can be traced back to 2 different things; you have a weak or poor ground connection for your brake lights, or they are drawing too much power on that circuit. Check the grounds on your brake light circuit (including on your vehicle side) and make sure they are solid and connected to a clean, bare-metal surface. Even some paint can cause some issues. If that all looks good then try disconnecting the lights one by one and testing...
    view full answer...
  • Wire Gauge Used On Optronics LED Trailer Light Kit # TLL9RK
    The Optronics Submersible LED Trailer Light Kit # TLL9RK referenced in your question uses 20 gauge wire for the included 25 foot wiring harness. This is a really nice light kit that also includes two stud mount, waterproof LED tail lights and the needed mounting hardware. I have attached a couple short video demonstrations on this kit that you can also check out.
    view full answer...
  • What Type of Metal is Used for Core of LED Trailer Light Kit with 25' Wiring Harness # TLL9RK
    The core of the Submersible, Under 80" LED Trailer Light Kit with 25' Wiring Harness # TLL9RK is stranded copper and would work well for you.
    view full answer...
  • Troubleshooting Trailer Taillights that Dont Blink When Running Lights are On
    What it sounds like is going on is that you have the wires from your trailer run backwards to the two illumination circuits of your trailer. This would explain why when the running lights are on the blinkers and stop lights aren't functioning. Since the harness of the lights has three wires you will need to make sure you are using all three of the wires. The running lights of your trailer should run to the wire on the lights that activates the lower intensity and the stop/turn circuit...
    view full answer...
  • Trailer Light Recommendation for a 1984 Skeeter Wrangler Bass Boat
    Since you have a boat trailer you are going to need trailer lights that are submersible. For a light kit that would work well on your trailer that has LED lights I would recommend the part # TLL9RK. I attached an install video for you to check out as well. If you are looking for any other specific accessories for you trailer e-mail me back and I will help you pick them out.
    view full answer...
  • How Does the Submersible, Under 80" LED Trailer Light Kit part # TLL9RK Wire to Trailer
    For the assemblies that come with the Submersible, Under 80" LED Trailer Light Kit part # TLL9RK that you referenced the white wires will need to be grounded, the brown wires will run to the running lights circuit, the green wire will run to the right stop/turn circuit and the yellow wire will run to the left stop/turn circuit. I attached a picture that has a standard trailer wiring diagram that should be helpful for you. The distance between the mounting studs is 2 inches.
    view full answer...
    Image 1 for
  • Can I Just Trim The Shroud On The New 4-Way To Fit My Application?
    Thank you for the pictures. Yes, you can simply trim the shroud on the wiring connector to make it fit. The perimeter was only to protect the pin connections from water, but is not absolutely necessary for use or functionality of the Submersible, Under 80" LED Trailer Light Kit with 25' Wiring Harness, # TLL9RK.
    view full answer...
    Image 1 for Image 2 for
  • LED-Type Replacement Trailer Lights for Featherlite Enclosed Gooseneck Trailer
    Trailer makers do not maintain detailed specs on the smaller items like the lights they use in production of their trailers so you can refer to the linked page that displays all of our LED-type trailing lighting. Just click on the type of light you want - such as a side clearance light or a taillight - to see the products in that category. You can use the filters on the page to narrow down the items displayed to those with the shape, color and even the dimensions you need. You can also...
    view full answer...
  • Wishbone Wiring And LED Trailer Lights For Trailer
    When choosing wishbone wiring for your trailer you will want to know how long the harness needs to be. I have attached a link to our product page for the wishbone wiring and harnesses we offer you can check out. As far as the lights you need for your trailer you can take a look at the linked product page I have provided. We have LED light kits that include the wiring harness as well you can choose from. Or you can let me know what size trailer you have and I will be glad to make some...
    view full answer...
  • Should Hole Where Wires Come Out Of Submersible Trailer Light Be Sealed With Silicone
    There is a lot of confusion when folks say submersible or waterproof. The difference is that submersible lights will have a small hole that allows the water to drain out if the light has been submersed in water. Waterproof is a sealed light that will not allow water into the a light assembly. It is always a good idea to disconnect the lights before backing a trailer into the water just to make sure. You can use silicone to seal around the wires on the back of the light. Any extra...
    view full answer...
  • Are the mounting screws stainless steel on the LED Trailer Light Kit, part # TLL9RK?
    Yes, the mounting hardware included with the Waterproof, Under 80 inch LED Trailer Light Kit with 25 foot Wiring Harness, part # TLL9RK, is stainless steel and corrosion-resistant.
    view full answer...
  • How do the Taillights in the Submersible Trailer Tail Light Kit Secure to the Trailer
    Yes, the light kit has mounting studs, nuts included, that are 2 inches on center for mounting to a metal mounting bracket. The bracket must be attached securely to the trailer frame because the lights in this kit get their ground connection through the mounting studs.
    view full answer...
  • What Are the Overall Dimensions of the Optronics Under 80-Inch LED Trailer Light Kit # TLL9RK
    The Optronics stud-mounted LED Trailer Light Kit, part # TLL9RK, features left- and right-hand LED light assemblies that are DOT-approved and waterproof, and includes a 25-foot wiring harness, mounting hardware and connectors, and a license plate bracket. The driver-side light includes license plate illumination. These lights mount using two supplied steel studs (on 2-inch centers) and they use a 3-wire system for electrical connection to your trailer wiring. Each light has a white ground...
    view full answer...
    Image 1 for
  • Wire Gauge Used in Optronics Standard Trailer Light Kit # TLL9RK
    I checked with my Optronics representative, who tells me that the 25 foot long wiring harness included with the # TLL9RK Standard Trailer Light Kit is constructed of 20 gauge wire.
    view full answer...
  • LED Trailer Lights All Light Up and Blink from Side to Side with Turn Signals On
    There are several things that could cause your trailer light to behave like this. The most likely causes are a bad or weak ground connections or a dirty/corroded trailer connector. Make sure that both the truck and trailer side connectors are clean and free of corrosion. Then make sure the main trailer connector ground and the grounds for all of the lights are connected to clean and corrosion free bare metal surfaces. If the trailer has an aluminum frame, tilt bed, or folding tongue or...
    view full answer...
  • What are the Dimensions of the Optronics Trailer Lights # TLL9RK
    I went and pulled an Optronics Trailer Light Kit # TLL9RK from our warehouse to measure the dimensions for you. Check out the video to see the measurements. The horizontal width of one of the lights is 5 inches, the vertical height of the unit is 4-1/2 inches and the depth of it is 2-1/2 inches. The distance between the mounting studs is 2 inches also.
    view full answer...
  • Wiring Harness Included with # TLL9RK LED Submersible Light Kit
    There is indeed a wishbone harness included with the # TLL9RK Light Kit. The running light circuit is split into two separate circuits, one for each side of the trailer. I just got done installing this exact kit on my PWC trailer about a month ago. It was easy to install and I really like the brightness and reliability provided by LED lamps.
    view full answer...
  • Left Side Trailer Lights Not Working With New LED Trailer Lights Installed
    The first thing that I would recommend checking are the ground connections for the trailer side connector and the lights. Poor ground connections are the most common culprit of trailer wiring issues. The lights will have either a ground wire or they will ground through the mounting hardware. Each of the ground connections should be secured to a clean, bare metal surface on the trailer frame or to the negative terminal of a trailer battery if you have one. If the ground connections check...
    view full answer...

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