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

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

Part Number: STL9RGB
In Stock
$37.46
Trailer Lights
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In Use/Installed

5-1/4" x 4-3/4" Square. Waterproof trailer light serves 7 functions: stop, turn, tail, rear reflex, side marker, side reflex, and license plate light. Stud mount on 2" centers. 2-Wire self-grounding design with 15" leads. Great Prices for the best trailer lights from Optronics. Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side part number STL9RGB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (1304)
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  • Videos (2)
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Optronics Trailer Lights - STL9RGB

Highlights

  • One Light, 7 Functions: Stop, turn, tail, side marker, rear reflex, side reflex, and license plate in one.
  • Reliable In Any Weather: Sealed, waterproof, and submersible design keeps water out and light working.
  • Fewer Replacements Needed: 14 LEDs last 50 times longer than bulbs and use less power.
  • Built to Withstand Vibration: Surface-mount technology protects the circuit board and improves heat control.
  • Simple Grounding Setup: 2-wire self-grounding design connects through hardware for easy wiring.
  • Exact Fit Mounting: Stud mount on 2" centers with included hardware for a secure install.

Features to know about

Brighter and More Efficient Lighting: 14-Diode LED Design

This LED trailer tail light uses 14 bright diodes that deliver sharp, clean light with less power draw. At 12.8V, it only uses 0.259 amps for the stop function and 0.062 amps for the side marker, making it far more efficient than incandescent bulbs. With no fragile filaments to burn out and a lifetime warranty on the LEDs, you’ll get dependable brightness every time you hit the road.

Optronics STL9RGB driver-side combination LED trailer tail light with red lens and built-in license plate illuminator, submersible square design.

Built for the Elements: Fully Sealed and Submersible

Water and moisture can destroy a trailer light fast, but this one is built to handle it. The sealed, waterproof housing is completely submersible, so it stays protected even when launching boats or driving through rain. The molded plastic body and durable acrylic lens keep out dirt and water while standing up to years of vibration and shock.

All-in-One Functionality: Seven Lighting Roles in One Unit

No need for extra parts or add-ons. This single light handles seven functions—stop, turn, tail, rear reflex marker, side marker, side reflex reflector, and license plate illumination. The built-in reflex reflector means you don’t have to install a separate one, keeping your setup simple while staying fully visible from all angles.

Simple Mounting and Wiring: 2" Stud Centers with Self-Grounding Design

Installation is straightforward thanks to the stud mount spaced on 2" centers and a 2-wire pigtail with 15" leads. The self-grounding design means it grounds through the mounting hardware itself—no extra grounding wire needed. That makes wiring cleaner and helps ensure a solid connection every time.

Durable Build That Lasts: SMT Circuit Board Construction

The LED circuit board uses surface-mount technology (SMT), which improves heat distribution and resists shock and vibration better than traditional setups. That solid construction helps keep your lights running smoothly in rough conditions while maintaining consistent performance over time.

Specs

Configuration

  • Configuration: driver's side
  • Passenger's side: STL8RGB (sold separately)

Dimensions

  • Overall dimensions: 5-1/4" wide x 4-3/4" tall x 2-11/16" deep
  • Light face: 4-3/4" wide x 4-3/4" tall
  • Distance between mounting studs (center on center): 2"
  • Wire length: 15"

Electrical

  • Power draw at 12.8V (Stop light): 0.259 amps
  • Power draw at 12.8V (Side marker light): 0.062 amps

Lighting

  • Diodes: 14
  • Functions: stop, turn, tail, rear reflex, side marker, side reflex, and license plate light
  • Lens color: red
  • LED color: white

Warranty

  • LED warranty: Lifetime

STL9RGB Optronics Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side - 15" Lead - Self Grounding





Video of Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side
Video Thumbnail Video Player Dialog

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




Video Transcript for Combination LED Trailer Tail Light: The Breakdown

Randy: Hey guys, Randy here at etrailer.com. Today we're going to be taking a look at the Optronics led trailer light. Now these are available in driver and passenger. The driver's side has our license plate light here on the bottom to illuminate that. The passenger side is not going to have that clear panel on the bottom. We use 14 LEDs over here on the driver, and you're going to have 11 on the passenger.

Now I really like these lights. They have a very durable housing, not a whole lot of give to it. The acrylic lens both here and on the side, really quite durable. Other than like backing into something, I really don't think you'll have to worry about these too much. Something I do also like about these, they serve more than just the lighting functions.

These are going to have built in reflectors here that go around.Of course, we're going to have our tail lights, going to have our turn signals. We're going to have our brakes, but also when our trailer's not in use or when it's parked, those reflectors are going to stand out. Same here on our light on the side, got the reflectorized lens there. So not going to need any additional reflectors on our trailer. Now this is a two wire design light.

So we just need to connect it to a good ground through our mounting studs, then our running light signal, and our turn and brake signal. It's going to give us all of those as we head down the road. I think it's going to be a really good addition to just about any type trailer under 80 inches. It is a submersible light. So even in marine applications and things like that, I think it's going to work out really well.You do want to unplug your lights.

I always recommend unplugging your lights. Some people do, some people don't, but I just don't like water getting in there when we're making electrical connections. The LEDs though, they are going to burn a lot brighter. They burn a lot cooler. They don't use near as much energy as what an incandescent bulb does, and they tend to last a lot longer. So more and more when working with customers, I typically see them going with LED lights when they're replacing lights on their trailer. If you had some incandescent lights up front, you don't really want to mix and match, that's up to you, but I would certainly recommend upgrading. You're going to do a lot less of chasing those bulbs or chasing the wiring to figure out what's gone wrong. Generally, it's going to be in that bulb socket.You got some kind of corrosion there. I think they're going to be a really good addition. Our customers, when working with them, they seem to be really pleased with them. They like the way they work. They like the way they look. I do too. I think by adding these to your trailer, you can solve a lot of the issues that we used to have with those incandescent bulbs and still keep it looking pretty traditional.To begin our installation of course, you'll need your old light removed from the trailer. The first thing we like to do, this light grounds through your mounting bracket. So it's a good idea to take a wire brush and really clean both surfaces of this off to make sure you don't have any scaly rust or anything like that. That can cause you issues down the road. You'll notice there's this little gap here, right where the wiring comes out. You want your wiring to be stored down and in there as we slide it into our bracket here. We're just going to take the provided hardware. Got a flat washer and flange nut there. We'll use our seven sixteenths. It's going to get that snugged down. No need to over-tighten these, but you do want them to be good and snug.We are looking at a two wire design that comes off of our light. This is my preferred style. Some of them will have three wires, which is a ground wire that comes off. I like grounding them right through the attachment points. We'll strip those back where we want them and I like to twist it up really well. You notice we're using heat shrink butt connectors here. I definitely think this is the way to go. This is going to ensure that you're going to have a good corrosion resistant connection here because moisture can't get in. Then we just need to connect it to the running light signal for our brown wire coming back from our trailer connector upfront. Generally, that's going to be the brown or darker wire, place that in and get it crimped down.Then for our yellow wire, which is going to be our turn and brake signal, it'll just need to go to the other. We'll use a heat source to get that shrink down. Here of course we're using a heat gun. Now with those connections made, I just like to tidy it up here. I like leaving excess, especially when we have something like this where we can get it tucked up and zip tie it off. In some cases you might want to trim it a little bit shorter, but remember if you ever have a problem with your wiring, you'll need to get it from somewhere. So if you didn't store any extra upfront, make sure you have some back here.Now that takes care of the driver's side here. That's the one that has that clear lens we talked about. Now you'll just head over to the passenger side and just repeat that same process. Only you're going to do green to green rather than yellow to yellow. All right, now we'll just test them out and make sure everything's working properly. We're going to use our trailer tester here, but you could just as easily plug it into your towing vehicle. You would start by turning on the running lights, make sure they both come on. Then we can check our left turn signal, check our right turn signal, and also our brakes. It looks like everything's working properly. All in all guys, I really like this light. I think it's going to be very durable and very sturdy. I think it's going to last for an extremely long time, especially if you're used to incandescent lights. These LEDs are really the way to go. All in all, this is definitely what I would put on my trailer and definitely one I would own.

Ratings & Reviews

4.8

1303 reviews
Review sort icon
5-1/4" x 4-3/4" Square. Waterproof trailer light serves 7 functions: stop, turn, tail, rear reflex, side marker, side reflex, and license plate light. Stud mount on 2" centers. 2-Wire self-grounding design with 15" leads.

by:

I ordered this as a replacement for an older trailer light that I had damaged. It is so much better than the old one, I had to order one for the driver's side as well! The LED lights are much brighter than the older, conventional bulb lights I had. Also, the side light does not extend out as far and will be completely protected by the light frame. I had rubbed the old light against a post and torn off the side light. This is a much better design!



by:

Installed the new lights today. Easy peasy. I grew up on a farm, in the country, and have been fixin' and futchin' with trailer lights since I was 6, it seems (I'm 74 now). Hopefully this is the last time I'll need to fix the lights on this particular trailer.



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Unlike my previous lights, these are really waterproof and work great. Funny thing- someone just backed into my trailer and took out my passenger side light last weekend so I'm ordering a new one as I type this.



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Quality product



by:

SAME AS STL8RGB JUST REVIEWED.



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Just as described. Worked great



by:

they are working great



by:

Very easy to install. Very bright



by:

Good light, not what I needed and was very easy to return.



by:

Easy to install, worked perfectly the first time. Still working.



by:

Everything was fantastic.



by:

Great for my lighting upgrade project for my trailer.

Marvin profile picture

Marvin

1/28/2020

GREAT PRODUCT, NO ISSUES WOULD FOR SURE BUY AGAIN.



by:

Good quality product connector is well made. Plenty of wire came for my installation (fairly short trailer) and instructions were clear. Still working after a year.



by:

Lights installed easily on trailer. After a year they look and work like new. Lights are highly visible and durable.



by:

Easy to install.



by:

They are well made and work well
Already
wired
Great


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See what our Experts say about this Optronics Trailer Lights

  • Replacement Light for a Wesbar 101535
    Hey Bryan. I couldn't find an exact replacement for your older Wesbar 101535. The closest option I did find is the Combination LED Trailer Tail Light item # STL9RGB driver's side and item # STL8RGB passenger side. These lights measure 5-1/4" wide x 4-3/4" tall x 2-11/16" deep. I attached a diagram below with that shows the dimensions we have for these lights. Can you widen out the cutout for the side lights?
    view full answer...
  • Are Taillights STL8RGB and STL9RGB a Set? What Butt Connectors and Shrink Wrap do I Need?
    Hello Dave, Yes, the Combination LED Trailer Tail Light - Submersible - 6 Function - 11 Diodes - Passenger Side # STL8RGB is the better half to the Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side # STL9RGB. The lights use 20 gauge wire, so you will need a pack of the Deka Heat Shrink Butt Connector - 22-18 Gauge - Nylon Insulation - Red - Qty 5 # DW05743-5. When I rewired my boat trailer I went ahead and put Primary Wire Heat-Shrinkable Tubing...
    view full answer...
  • Parts Needed To Install A Trailer Tail Light That Has 4 Wires
    I am unable find any lights like these that have the 4 wires for attaching to the light. You should be able to test each of the wires for their function using a 12 volt battery and connecting the wires directly to the terminals. My only concern is that your lights were set up to have separate brake light functions and that is why you have 4 wires. If that is the case and you want the lights to function properly you will have to run additional wiring and components as opposed to just using...
    view full answer...
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  • Compatiblity of STL9RGB and STL8RGB LED Lights with Trailer With Physical Ground Wire
    The Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side # STL9RGB and # STL8RGB for the passenger side will work well for you. When installing the light you can ground your current wire to the mounting hardware post with a ring terminal which will ensure a quality ground.
    view full answer...
  • LED Trailer Taillights with 2 inch Between Mounting Holes and 2 Wire Design
    For a 2-wire trailer taillight with 2 inches between the mounting studs and is also LED you'd want the part # STL8RGB for the passenger side and part # STL9RGB for the driver side. The two wires you have to your current taillights will carry the running light circuit on one wire and the stop/turn on the other. So you'd need to use your circuit tester to test both wire by function when connected to a tow vehicle.
    view full answer...

Do you have a question about this Trailer Light?


Info for this part was:

Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee Randy B
Installed by:
Randy B
Employee Daron K
Edited by:
Daron K
Employee Zach D
Video by:
Zach D
Employee Michael B
Video by:
Michael B
Employee Shane H
Test Fit:
Shane H
Employee Brian T
Written by:
Brian T
Employee Matthew E
Updated by:
Matthew E

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