bing tracking image
  1. Trailer Lights
  2. Optronics
  3. Tail Lights
  4. Round
  5. LED Light
  6. Red
Optronics LED Trailer Light - Brake, Tail, Turn - Submersible - Round - Red
Optronics

Optronics LED Trailer Light - Brake, Tail, Turn - Submersible - Round - Red

Part Number: STL43RB
In Stock
$13.94
Retail:$17.59
You Save: 21%
Trailer Lights
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.
By submitting this form, you understand and agree to our Terms of Sale, Website Terms of Use and Privacy Policy.

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

4-5/16" Waterproof light displays brake, tail, and turn signals on your trailer. Mounts in a cutout with a grommet (sold separately) and works with 3-prong plugs. Great Prices for the best trailer lights from Optronics. Optronics LED Trailer Light - Brake, Tail, Turn - Submersible - Round - Red part number STL43RB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (1756)
  • Q & A (0)
  • Photos

Optronics Trailer Lights - STL43RB

Highlights

  • One Light, 3 Functions: Displays stop, turn, and tail signals for clear communication on the road.
  • Reliable In Any Weather: Waterproof design keeps moisture out—ideal for boat or utility trailers.
  • Fewer Replacements Needed: Ten long-lasting LEDs use less power and outlast bulbs.
  • Quick Plug-In Setup: Standard 3-prong PL-3 connector works with A45PB or A47PB pigtails.
  • Simple Mounting Options: Installs in a grommet cutout or bracket for a clean, recessed fit.
  • Direct OEM Match: Replaces Truck-Lite #44302R, Grote #53252, and Peterson #M417R-2.

Features to know about

Brighter, More Efficient Lighting: 10-Diode LED Design

This 4-5/16" round Optronics LED light puts out a crisp red glow that grabs attention fast. Ten white LEDs shine through the red lens to handle tail, brake, and turn functions—all while drawing a fraction of the power of old bulbs. At 12.8V, it pulls just 0.360 amps on stop/turn and 0.030 amps on tail, so it’s easy on your wiring and battery. No filaments to burn out, no weak spots—just strong, consistent light every time you hit the brakes or turn signal.

Built for the Elements: Fully Waterproof and Submersible

If your trailer sees wet roads or boat ramps, this light is ready. The polycarbonate lens and housing are sealed tight to keep water out and protect the LEDs inside. It’s fully submersible, so it won’t fog or short even with repeated dunking. For saltwater use, a bead of silicone sealant and a dab of marine grease at the plug connection keep everything watertight and corrosion-free.

Clean, Simple Hookup: Standard PL-3 Connector

Wiring couldn’t be easier thanks to the built-in PL-3 connection that mates with common 3-prong pigtails like part #A45PB or #A47PB (sold separately). Plug it in, connect your ground and signal wires, and you're set. The low amp draw means you won’t overload circuits designed for incandescent lights, and you can add an optional load resistor kit (#ALEDRST1B) if your system needs to mimic higher draw to prevent hyper-flashing.

Quick Mount Options: Grommet or Bracket Setup

This light installs cleanly in a recessed cutout using the rubber grommet #A45GB (sold separately). If you’d rather not cut into the trailer body, mount it using the optional bracket #BK45BB along with the same grommet. Either way, the fit is snug and solid with no rattle or leaks. The round face sits flush at just 1-15/16" thick for a professional finish that looks right at home on any setup.

Dependable Performance That Lasts

The LEDs are backed by a lifetime warranty and designed for long service life without dimming or failure. With its sealed housing, efficient electronics, and simple wiring interface, this Optronics 4-inch round LED tail light is a reliable upgrade that keeps performing season after season—no bulb swaps needed.

Specs

Dimensions

  • Overall diameter: 4-5/16"
  • Thickness: 1-15/16"

Dimensional diagram of Optronics STL43RB round red LED trailer tail light showing measurements and mounting depth for recessed installation.

Electrical

  • Compatible systems: 12V DC
  • Diodes: 10
  • Power draw at 12.8V (Stop/Turn): 0.360 amps
  • Power draw at 12.8V (Tail): 0.030 amps

Close-up of Optronics PL-3 three-prong wiring connector used with STL43RB round LED trailer light, showing plug orientation and connection points.

Warranty

  • LEDs: Lifetime warranty

Manufacturer Cross Reference

  • Truck Lite #: 44302R
  • Grote #: 53252
  • Peterson #: M417R-2

STL43RB Optronics LED 12V Combination Trailer Tail Light - Stop, Tail, Turn - Waterproof - 10 Diodes - Round - Grommet Mount - Red Lens

Alternate part number: STL-43RB





Customer Satisfaction Score:

Ratings & Reviews

4.8

1753 reviews
5 Stars
(1532)
4 Stars
(143)
3 Stars
(36)
2 Stars
(17)
1 Star
(25)
Review sort icon
4-5/16" Waterproof light displays brake, tail, and turn signals on your trailer. Mounts in a cutout with a grommet (sold separately) and works with 3-prong plugs.

by:

Extremely pleased with my purchase. I have a set of tow light, needed to replace the LED housing. The manufacturer of my lights did not sell the housing. I would have to purchase the whole thing again. So glad I found etrailer in my search. Housing was just like my OEM housing, and worked perfectly.



by:

I checked with several RV parts locations in our area including CW and this product was not available. Etrailer.com made ordering so easy and what service! I received an immediate order confirmation and the shipping confirmation arrived very quickly too. I just received my delivery and the installation has been completed. Thanks guys for such great customer service!



by:

Good brake and turn signal light. Gave my old trailer some style. etrailer.com has great customer service and will take care of you.



by:

We had a trailer that had old Grote anti-theft incandescent lights. The holes for them were right around 4.450” so there weren’t a lot of products we could find that would fit without major modifications. The Optronics lights with the thinner plastic flange mount did the trick! Thanks for stocking this product!



by:

We have been changing out the brake lights on all of our trucks with these led brake lights over the years. They are easy to see during the day and the lenses do not oxidize and wear out like the normal fixtures do. Plus you don't get the melted section in the middle of the light from the bulbs getting hot. Love these bad boys!



by:

Tail light assembly for Yakima Rack and Roll trailer. This is a relatively low cost item which includes light bulb sealed in a waterproofed unit. Item was delivered very quickly.



by:

I got two of these because one of the lights on my trailer had been cracked when I lent it out and subsequently the running light no longer worked. The lights that they replaced were standard incandescent bulbs and I didn't like the fact that I couldn't just replace the bulb as they were sealed units like these. Because these are led's I expect them to last quite a bit longer so the fact that they are sealed also is not as much of a problem and in reality should help them last longer.



by:

Was exactly what I needed and fit perfectly. Shipped very quickly too.



by:

While I haven't actually used them on a trip yet, I have to say that installing the LED stop/turn/tail lights was almost a no-brainer. Once I figured out the correct sequence, the lights easily slipped into the existing rubber housings. I plugged in the electrical connectors and they worked perfectly. Knowing that they'll never burn out is comforting.



by:

eTrailer.com did a Terrific Job for us! We needed tail lights for the Dune Buggy we're building in three different collors (red, amber & clear), and eTrailer was able to provide these for us in otherwise identical lights. We received everything we needed (all of the right appurtanances) and they look great! We were also impressed with the timeliness of etrailer.com's shipping and delivery, as we received our order far more quickly than promised or anticipated. The License Plate Holder and Light also look great! (Although the light is a little dim.) Overall high marks, and I would use eTrailer.com and Optronics again.



by:

Excellent so far. Great fit and no leaks



by:

These lights are perfect! They have more LED's than the lights that came on my trailer and it looks better and is safer when towing at night.

Perfect parts and at a great price!
Thank you!
Scott C.

Scott C. profile picture

Scott C.

11/1/2017

Perfect part and now a year later still perfect! These are a lot brighter than the old ones for sure and still look great! Excellent value, great service! What a great combination in a supplier! Order with confidence!



by:

These are extra in case my taillight goes out



by:

Although UPS is a little rough on packages, everything arrived unbroken. The only thing I didn't realize was that there was not any pigtails for these tail lights. Everything else was great. I'll see about chasing down the pig-tails from the local trailer dealer.

J.l. profile picture

J.l.

7/28/2020

Have had 0 problems since installed. Much brighter appearance. Have since replaced tail and marker lights with 3 other trailers. Great job guys and gals.



by:

These light are great quality and shipping was extremely fast. I only needed one but purchased 4 and changed all my brake lights over to LED. I also appreciate the plethora of information with regard to issues installing this item. I had a little trouble fitting them back in my existing grommet, but your videos were very helpful. We have used etrailer several times. It's our go-to. Thanks again!

Megan profile picture

Megan

1/19/2020

After about a year of using these brake lights, they are all working well! I took a trip about 600 miles away, and they worked extremely well allowing other vehicles to see my horse trailer and keeping us safe! I would definitely recommend this product to others!



by:

Ordered two, one had misguided plugs and would not work with my installed 3 prong male plug, the second finally plugged in
with difficulty, but the light worked when installed. Glad I ordered two as just needed one now, and the second was a spare for
future use. All through the order process the company offered great service and very quick shipping. Probably will use them again
in the future for needed parts in a hurry.

Capt T. profile picture

Capt T.

9/12/2020

As stated, the one didnt work at all and was trashed. The other worked with difficulty plug in was mismatched but is still working.



by:

I ordered a number of LED replacement components for my motorcycle trailer as well as a locking hitch pin and ball covers. I was very pleased with the shipment, product quality, and the attention to customer service (which came into play to make sure I did not incur shipping fees). Plus, the LED lights look great on my aluminum trailer. I will happily continue to do business with etrailer!

Jim B. profile picture

Jim B.

8/8/2017

Excellent



by:

Great response time. Exactly what I ordered and had shipped to my destination. Thanks for the follow up William!



by:

fast shipping and very well priced. works all the time.



by:

Quick and easy order process parts are exactly what it showed & fit perfectly



by:

I am in the process of renovating a 1966 Airstream. I wanted to upgrade the tail lights and the clearance lights. I found etrailer.com on a web search. I ordered the round 4" LED, rubber 4" grommet, and Oval LED clearance light. The round stop with grommet adapeted perfectly into the lens on the Airstream. I will feel so much safer now with the added visability. The lights are stellar.

" />

by:

Easy to order online, Items arrived during the expected delivery date. Have always had good luck with Optronics products. Just waiting for the truck to get back to the shop so I can replace the old incandescnt lights with the new LED lights.



by:

They work great and we're fairly easy to install as a replacement for the old style brake lights with bulbs....



by:

Bought these LED Stop/Tail lights for my new dump trailer. The factory stop/tails are mounted very low, and any car directly behind me blocks my lights from the 2nd or 3rd car behind me. So I mounted these new ones up as high as I could to let people know I am stopping or turning. I also mounted a side marker light so I could see where the trailer was while backing up at night. The factory marker lights are so low I can’t see them in my mirrors because they are blocked by the step on the drivers side and the spare tire on the passenger side. I am a retired 18 wheeler driver of 47 years.



by:

We are looking for a supplier of trailer parts .. they had what we needed.
We build aprox 60 trailers a year. I am going to take a good look to see what else we can get from them.


25
25

See what our Experts say about this Optronics Trailer Lights

  • Replacement Tail Light For Forest River Georgetown XL RV
    I'd be happy to assist you. It sounds like you need the Sealed, Flush Mount Tall Rectangle LED Trailer Stop, Turn and Tail Light, Grommet and Plug, 12 Diode # STL34RB but most of the pictures I see have round tail lights like the Sealed, 4" Round, LED Stop/Turn/Tail light, 21 Diode - Red # STL55RB. If this is not the correct part, then send me a photo with the measurements of the light and we will get you what you need. The numbers and letters that are actually printed on the light are...
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Complete Trailer Light Wiring and LED Light Replacement for a Towable Air Compressor
    Daniel, I'd be happy to help you put together a complete lighting setup. From your description, it sounds like your towable air compressor uses round Grote-style tail lights with a 3-pin connector. Based on that, I recommend the Optronics LED Trailer Light part # STL43RB along with the matching right-angle 3-wire pigtail part # A47PB. The STL43RB measures 4-5/16 inches in overall diameter and 1-15/16 inches deep, and it's a very common replacement size for this style of trailer light....
    view full answer...
  • Rubber Grommet for Optronics LED Trailer Light
    Hi James; are you referring to the Optronics LED Trailer Light # STL43RB you were looking at? Are you using the Rubber Grommet for 4" Round Trailer Lights # A45GB or something else? The only other option we have is the Trailer Light Mounting Bracket for 4" Trailer Lights # BK45BB but that also requires the use of the grommet.
    view full answer...
  • What Size Light Fits in a 4-1/2" Cutout?
    Hey Andrew, thanks for the information. For a 4-1/2" cutout you'll want a light with a 4-5/16" diameter like the item # STL43RB for Red or the item # STL43A24B for Amber. These will install with the Rubber Grommet for 4" Round Trailer Lights item # A45GB. That'll be a nice snug fit in your cutouts. What size are your other lights? If you could get me dimensions or part numbers I can see if we have comparable replacement options.
    view full answer...
  • Recommended Grommet for a 4-5/16" Diameter Optronics LED Trailer Light
    Hey Loren. For the Optronics LED Trailer Light item # STL43RB you'll need the Rubber Grommet for 4" Round Trailer Lights item # A45GB. We also have this same light in Amber it's item # STL43A24B. What kind of trailer do you have?
    view full answer...
  • Recommendations For Adding Tail Lights To A Kuat NV 2.0 Bike Rack
    Though you will need to have a 4 Flat on your 2001 VW Eurovan, and for this I do recommend the Curt # C56175, adding lights to your Kuat NV 2.0 is definitely a good idea. I went through all our options for adding lights to a bike rack or cargo trailer, and the Curt Auxiliary LED Indicator Lights # C53201 will be the good option, but there is a potential issue. The base of the rack is not the same length on both sides and the arm the swings up and tightens down on the wheel will give you...
    view full answer...
  • Compatibility of Optronics Trailer Tail Light # STL43RB With Trailer 4-1/2-Inch Opening
    The Optronics Trailer Light # STL43RB that you referenced can mount using rubber grommet # A45GB. But this light's overall diameter is 4-5/16-inches so this light unit would be too large to allow for grommet mounting in your trailer's 4-1/2-inch opening. However, my contact at Optronics confirmed that this mounting grommet # A45GB will fit a 4-1/2-inch rough opening and with it you can use the other light you referenced, part # STL101RB, which is 4-inches in diameter. If you need a wiring...
    view full answer...
    Image 1 for
  • Installing Trailer Tail Lights with Two Wire Connections on 4-Way Wiring
    They are single function lights, so they can be used as running lights or stop/turn but not both. So for your trailer to be legal, you will need to run two on each side, one for the running light (brown wire of your 4-way) and one for the turn/stop light (green or yellow wire of your 4-way depending on side of the trailer). You will attach the power wire (green, yellow, or brown) to the red wire of your light. The white wire on your light will go to ground, so you will attach it to the...
    view full answer...
    Image 1 for
  • Trailer Wiring and Lighting Replacement for Trailer with 4.5 inch Red and 2.5 inch Amber Light
    For a 4-1/2 inch diameter trailer taillight that can do stop/tail/turn functions we have the part # STL43RB which would work well. For a rubber grommet then we'd need the part # A45GB. Then for a pigtail harness you'd need the part # A47PB. For the 2-1/2 inch amber lights you'd want the part # MCL59AB and for a grommet for this you'd need part # A55GB. For a pigtail for this you'd want part # A46PB. Then for 4-way wiring sold by the foot you'd want the part # 16-4B-1.
    view full answer...
    Image 1 for
  • Troubleshooting 3 Wire LED Tail Light Installation
    Your old two wire lights definitely used the mounting screw as the ground. Your new LED lights with 3 wires will be easy to transition. You will connect the running light wire and the turn/stop wire just as before, and then you will run the ground wire directly to your steel frame. A bad ground is most likely the issue with your fuses blowing. Make sure your ground wire to your frame is metal on metal and your 3 wire LED lights like # STL43RB with 3 wire pigtail similar to the # A45PB....
    view full answer...
  • Tips for Installing New Trailer Clearance Light into Rubber Grommet
    Getting light assemblies into the grommets can be somewhat challenging. We have found that if you insert the grommet first (like you did), and then put a light amount of grease around the grommet edge the light will slide in easier. If you check out the video I attached you can see one of our installers walk through this process. Fast forward to the 1:45 mark.
    view full answer...
  • Is the Optronics LED # STL43RB the Correct Replacement for Peterson 426 Taillight
    The Optronics LED Taillight you referred to, part # STL43RB would indeed be a correct replacement for the Peterson 426 lamp you referred to. The # A45GB would be the correct replacement grommet and for a pigtail, you'd use part # A45PB. The LED replacement would be a great option, as they use a lot less power, would last much longer and are quite a bit brighter than their incandescent counterparts.
    view full answer...
  • Can Bulb be Replaced on Peterson Red Flush Mounted Sealed Turn Signal Light 435800
    Peterson brake/turn signal light # 435800 is sealed and cannot be opened up to change out the bulb. I pulled one from the warehouse to verify this and cannot get the lens off (without breaking it) to access the bulb/interior of the light. What I recommend is to use an LED light, # STL43RB, because the LEDs will last much longer than a regular incandescent bulb. For a grommet use # A45GB and for a wiring harness use # A45PB.
    view full answer...
  • Trailer Tail Light Replacement for a Trulite model 44 LED Tail Light
    From my research it looks like the Submersible LED Optronics Trailer Light # STL43RB is a comparable replacement light. It is 4-5/16" in diameter and has 10 super diodes that function as stop, turn, and tail signals. You can install the light using a Pigtail, like part # A45PB or part # A47PB, and a Rubber Grommet # A45GB. A sample installation video has been linked for you to use as a reference.
    view full answer...
  • LED Replacement Light Recommendation For Bargman 68 Round 4-1/2 Inch Trailer Lights
    We have four different round LED stop, turn and tail lights that will fit in the 4-1/2 inch diameter holes in your rear bumper. You could use the Optronics light, # STL23RB, # STL43RB, # STL53RCB or # STL23CCRB. These are 4 inch round lights, but they require a rubber grommet, # A45GB, that allows 4 inch round lights to flush mount in a 4-1/2 inch cutout. Lights # STL43RB and # STL53RCB are sealed, submersible lights if you are adding these lights to a boat trailer. All of these lights...
    view full answer...
  • Recommended Three-Prong Wiring Plug For Optronics Sealed Round LED Trailer Light # STL43RB
    We do have the three-prong pigtail you can use with the Optronics Trailer Light # STL43RB. You will need part # A45PB. This has the three-prong plug with 10 inches of wire.
    view full answer...
  • Can Sealed 4 Round LED Trailer Light # STL43RB Be Used Underwater in Saltwater Environment
    I spoke with my contact at Optronics and in order to use the Sealed, 4" Round LED Trailer Stop, Turn and Tail Light, # STL43RB, in the saltwater environment, you will want to use marine grease like part # L54FR on the Straight 3-Wire Pigtail Plug, # A45PB, and then seal around the plug with a silicone sealant like part # 0160297. This will help to prevent any water from getting into the light housing during the constant in and out of saltwater service that your boat gets.
    view full answer...
  • Solution for Installing Optronics LED Trailer Tail Light on Trailer With Round 3-Prong Light Plug
    The Optronics LED Trailer Tail Light # STL43RB is only available with this plug style. We do not carry the GROTE brand or have any lights like this that match the round plug. However, a simple solution would be to cut off your existing plug and use the # A47PB or # A45PB.
    view full answer...
  • What is Included with Optronics 4 Inch Round LED Tail Light
    The Optronics 4 Inch Round LED Tail Light # STL43RB does not come with a pigtail. For a 3-Wire Pigtail with a 3-Prong Plug # A45PB is what you'll need. If you'd like the rubber grommet then # A45GB is what you're looking for.
    view full answer...
  • Replacement LED Tail Light For Pacific Trailer
    We have LED trailer lights available. If you have the dimensions of the light you want to replace that would help in finding the right replacement for your Pacific trailer. From my research I found that some of the Pacific trailers use part # STL42RB. This is a 4-inch round flange mount light that has 10 LEDs. It is a three function stop/turn/tail light. If you need a flush-mount light, we also have part # STL43RB. this is also a 3-function 10-LED light. If you are looking for an oval...
    view full answer...
  • 4 inch Round 24 Volt Trailer Clearance Light
    For a 24 volt version of the light you referenced you would want the part # STL23R24B as this light can be used on a 24 volt circuit.
    view full answer...
  • Recommended Load Resistor for Installing Optronics LED Trailer Light STL43RB
    When high-efficiency LED type lights are installed in place of power-hungry incandescent bulbs it is often necessary to install a load resistor. The resistor turns some of the incoming power into heat and in doing so it mimics the higher power draw of an incandescent bulb. This will prevent the hyper-flashing common when LEDs are installed in an incandescent lighting system. For the Optronics Round LED Trailer Stop, Turn and Tail Light # STL43RB you can use their load resistor kit # ALEDRST1B...
    view full answer...
  • Could Optronics GloLight Trailer Taillight STL101RB Be Wired for Stop/Turn/Tail Circuits
    The GloLight LED Trailer Tail Light # STL43RB you referenced can be used for the application you mentioned. It's a dual intensity light which means that the lower intensity would cover the running lights and the brighter one would cover the stop and turn circuits. There isn't a way to operate the ring around the outside of the light separately. You'd want the harness part # A45PB to install the light. White wire is for ground, black wire is for running lights and red would be for stop...
    view full answer...
  • Replacement 4 inch GloLight Trailer Light Recommendation
    It sounds like you are looking for the GloLight Trailer Tail Light # STL101RB which is a 4 inch diameter GloLight trailer light. I attached a review video for you to check out as well.
    view full answer...


< Previous
12



Do you have a question about this Trailer Light?


Info for this part was:

Employee Zack K
Video Edited:
Zack K
Employee Lindsey S
Updated by:
Lindsey S
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Amanda K
Updated by:
Amanda K
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R

At etrailer 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.