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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 # STL9RGB
Our Price: $27.57
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Shipping Weight: 0.6 lbs
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Optronics Pedestal Mount Trailer Lights - STL9RGB
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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 or call 1-800-940-8924 for expert service.
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  • Reviews (17)
  • Q & A (0)
  • Videos (2)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - STL9RGB

  • Tail Lights
  • Square
  • LED Light
  • Red
  • 5L x 4-1/2W Inch
  • Pedestal Mount
  • Stop/Turn/Tail
  • Side Marker
  • Side Reflector
  • Rear Reflector
  • Submersible Lights
  • Optronics

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.


  • Square combination trailer tail light serves 7 functions
    • Stop light, turn signal light, tail light, rear reflex marker, side marker light, side reflex reflector, and license plate illuminator
  • 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
  • 2-Wire pigtail hardwires with 15" leads
    • Self-grounding design grounds through hardware


  • Configuration: driver's side
    • Passenger's side: STL8RGB (sold separately)
  • Dimensions: 5-1/4" wide x 4-3/4quot; 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"
  • Diodes: 14
  • Power draw at 12.8V:
    • Stop light: 0.259 amps
    • Side marker light: 0.062 amps
  • Wire length: 15"
  • Lifetime warranty on LEDs

Optronics STL9 Series Waterproof LED Combination Tail Lights

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

California residents: click here

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

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

Video Transcript for Optronics Combination LED Trailer Tail Light Review and Installation

Randy: Hey guys, Randy here at 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.

Customer Satisfaction Score:

Customer Reviews

Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side - STL9RGB

Average Customer Rating:  4.8 out of 5 stars   (17 Customer Reviews)

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.


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


they are working great


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.


Great for my lighting upgrade project for my trailer.

Marvin - 01/28/2020


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


Just as described. Worked great


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


Very easy to install. Very bright










Quality product



See what our Experts say about this Optronics Trailer Lights

  • 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...
  • 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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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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