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Optronics Trailer Tail Light - Stop, Turn, Tail - Submersible - Incandescent - Oval - Red Lens

Optronics Trailer Tail Light - Stop, Turn, Tail - Submersible - Incandescent - Oval - Red Lens

Item # ST70RB
Our Price: $8.11
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6-1/2" x 2-1/4" Oval. Waterproof trailer light functions as a stop, tail, and turn signal light when properly mounted. Shock-proof socket protects incandescent bulb. Flush mount with grommet (sold separately). Accepts 3-prong plug. Lowest Prices for the best trailer lights from Optronics. Optronics Trailer Tail Light - Stop, Turn, Tail - Submersible - Incandescent - Oval - Red Lens part number ST70RB can be ordered online at or call 1-833-496-1390 for expert service.
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Optronics Trailer Lights - ST70RB

  • Tail Lights
  • Oval
  • Incandescent Light
  • Red
  • 6-1/2L x 2W Inch
  • Recessed Mount
  • Stop/Turn/Tail
  • Submersible Lights
  • Optronics

6-1/2" x 2-1/4" Oval. Waterproof trailer light functions as a stop, tail, and turn signal light when properly mounted. Shock-proof socket protects incandescent bulb. Flush mount with grommet (sold separately). Accepts 3-prong plug.


  • Red trailer light serves 3 functions when properly mounted
    • Stop light
    • Tail light
    • Turn signal light
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Shock-proof socket protects the incandescent bulb
  • Durable polycarbonate lens and housing
  • Red lens
  • Compatible with 12V DC systems
  • Flush mount with grommet (A70GB - sold separately)
  • Accepts industry standard 3-prong plug (A45PB or A47PB - both sold separately)
  • DOT compliant


  • Dimensions: 6-1/2" long x 2-1/4" tall x 2-3/8" thick
  • Power draw at 12.8V:
    • Stop/turn: 2.4 amps
    • Tail: 0.50 amps
  • 3-Year warranty

Manufacturer Cross Reference
Light will work as an exact replacement for:

  • Uni Bond # SE2238R
  • Wesbar # 203561
  • Truck Lite # 60202R
  • Grote # 52182
  • Peterson # 421R
  • Bargman # 40-06-001

Optronics ST70RB Oval Sealed Tail Light Diagram

Sonically 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 housing and lens are sonically sealed together to create a single unit, which means that water will not get into the light and damage the diodes or circuit board.

Recessed-Mount Light

Recessed mount light

Recessed-mount trailer lights install underneath a housing or a grommet (A70GB - sold separately). These lights will extend into the mounting surface and require that a hole be cut into your trailer.

ST70RB Optronics Trailer Tail Light - Stop,Turn,Tail - Submerisble - Incandescent - Oval - Red Lens

Alternate part number: ST-70RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Optronics Trailer Tail Light - Stop, Turn, Tail - Submersible - Incandescent - Oval - Red Lens - ST70RB

Average Customer Rating:  4.9 out of 5 stars   (1132 Customer Reviews)

6-1/2" x 2-1/4" Oval. Waterproof trailer light functions as a stop, tail, and turn signal light when properly mounted. Shock-proof socket protects incandescent bulb. Flush mount with grommet (sold separately). Accepts 3-prong plug.


I thought a replacement for our GMC 5500 Topkick was going to be something I had to order from eBay. Just by searching the information on the light I was directed to your site. Easy to install, and our company will order from etrailer again. Next day delivery was super fast and had it the next morning.


Replaced the old tail light on my Karavan snowmobile trailer perfectly and took less than a minute to swap the old one out with this one.


You knew exactly what trailer tail light I needed for my 20 year old horse trailer. This one works superbly, it was easy to install, and your directions were perfect! I can't thank you enough (also I received it in a very timely manner) so for now on if I ever need lights for anything you'll be the only one I order from !!!!


Excellent response time for the exact replacement trailer tail light. The product will fit with the 3-pin plug for easy swapping old for new. Unfortunately the old bezel must be used and superglue or other securement is necessary complicating the replacement process. I would have preferred a product replacement LED that would directly fit the mounting screw location for the bezel taillight and bezel assembly, but that doesn’t appear to. E available..


Very pleased with this purchase,I will order from etrailer again when I need more items for my farm/business.


Needed to replace the taillights on my stock trailer. Great dealing with the good folks at The taillights I got from etrailer were easy to install and are very bright. I will do business with these folks again!!

Great! Good product!
Charles S - 08/13/2020


I’m 100% satisfied with the product. Tracking and time to deliver is greatly lacking. I would not order from this company again because of those two reasons

Still holding up great !
Eric - 03/17/2022


I have ordered a couple different lighting options for a trailer I was going to sell and these people really took care of me in a timely manner and will continue to use them in the future. Thanks y'all!


Perfect fitment along with fast shipping.Great value so I bought two.

Still lighting the way on my wave runner trailer after 6 trips to the lake this year and bought a spare when other side goes out.
Bryce - 11/04/2022


Needed sled trailer replacements. Didn't know the model number or anything. These were exact replacement and etrailer always comes through!

Still working fine!
CH - 03/28/2022


Good quality. Good match. BUT - The width of the product seems ever so slightly wider than the original but it fits - just squeezes and pushes the metal trim slightly.


Lost light and rubber grommet on road trip with motorcycle trailer. The replacement light and grommet ordered fit well and works great. Easy ordering and delivery as expected. Video was very helpful. Only issue I see is the rubber grommet is not as snug as original, however fit fine.

Put 5000 miles on a trip and long winter storage, light still works great this spring.. Thank you
GS - 05/16/2020


I wish I had a picture of the signal
light flashing.

Attached is a picture of my 1958 Alumniacrafet w/Linex inside, Powdercoat outside, and new oak seats.

I was going to take it on the maiden voyage and realized the lights on the trailer had burned out. Luckily etrailer's website was very easy to use and offered a plug and play replacement.

The parts arrived to NW Montana on time. My wife and I were able to see the Arctic Grayling spawning up Rogers Creek from Lake Rogers in NW Montana. Thousands of fish in a four foot wide, ice cold stream, narrowly escaping a sow black bear that was eating only the cheek fat and leaving the rest for the bald eagles.


I bought a trailer a year ago and it had some lights out, i tried going locally for replacements but couldn't find what i needed, tried etrailer online and they had the lights for my particular trailer that were exact replacements, i ended up going with the led option and they are still going strong today! etrailer is now my go to site for anything and everything trailer, Thank You etrailer!


as described


I am very satisfied with this product, everything is going well with the my lights


Impressive quality and fast shipment! Highly recommend.


Exact replacement for my sure trac trai ler..


Your replacement lights are even brighter than the original equipment!! I was selling this trailer and just had to get the lights on time to work out with the buyers plan of seeing it. Well, thet came exactly when you said and were the perfect item that sold the trailer!
Thanks for your quick turnaround,
Dennis Mc


Excellent support and service! Got exactly what I needed


etrailer is a great company . I use them for all my trailer needs . They always have what I need and it always is shipped fast and is packaged great and arrives in great condition.This time I needed hard to find tail lights for my 20 year old boat trailer etrailer has got em. Thanks guys keep up the good work


Perfect replacement fit, great price and excellent service as well.


Perfect fit - coming back to buy another for other side!


Not only is this product perfect but you did an excellent job in delivering it to me in a very timely manner ! I also love the video you sent to help me install it properly. I will always order from you for now on- nobody else is as good as you !


great service great product. thought the video showing how to install was great idea

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

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    If you have tested the left turn/brake pin on the trailer connector on the vehicle, and found that it works correctly, then the problem is in the left turn/brake lamp circuit on your trailer. Start at the trailer connector itself, checking for excessive corrosion or damage. Clean, repair or replace as necessary. If you have a 4-pole trailer connector, the point where the wire enters the plug itself is a common failure point. Typically, the left turn/brake circuit is a yellow wire. Trace...
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  • Where is the Tow Package Wiring Located on a 2001 GMC Sierra
    The first thing I would check is a tow package wiring fuse or relay on the truck. Use the owners manual and/or legend on the under hood fuse panel to find the locations of any fuses/relays related to the tow package wiring. All of the tow package wiring should terminate under the hood. Since the turn signal is not working at the truck side trailer connector and because you have the same problem on all trailers you tow a fuse or relay is the likely culprit. I have also included some links...
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  • Troubleshooting Dim LED Tail Lights on a 1996 Dodge Ram 3500 with a Flatbed
    I recently had a similar problem with the LED lights on my flatbed that I have on my 2000 Dodge 3500, except all of the tail lights on the left side of my bed were dim. My issue was a poor ground connection and I would suspect that would be your issue as well. I recommend inspecting all of the ground locations as well as the ground wires coming from each of the lights. Look for loose connections or pinched wires. If your lights use the plug-in style pigtail harnesses (see photo), look...
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    The link provided will take you to our main page for trailer tail lights. You can use the filters at the left margin to narrow the results to those items that best match your original lights. It sounds like your existing tail lights are the flush-mount type that are usually pressure-fit to a rubberized grommet that fits inside the trailer cut out. It may be that exact drop-in replacements of the correct dimensions are no longer available. Depending on the age of the trailer (and how...
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  • Installing a Light and Grommet On Trailer Troubleshooting
    Without knowing exactly what light assemblies you have on your trailer it's a bit hard for me to say exactly how to reinstall them, but for the most part you will want to install the grommet first on the trailer and then slide the light into place after similar to the video I attached. You will see in the video that our installer used a bit of grease on the inside of the grommet to help the light slide into place easier.
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  • Replacement Trailer Light that has SAE ST1PP2 On Lens
    SAE ST1PP2 is the lens rating and not a model number for the light. If your original light 6-1/2" L x 2-1/4" W x 2-3/8" D then Optronics light # ST70RB will fit in its place. If you have different dimensions let me know what they are and I can see if we have anything that is a match.
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  • With Trailer Connected and Plugged in New LED Lights on Truck Do Not Work
    I would need to know the year, make, and model of the truck and if it has a factory trailer wiring connector or an aftermarket one. And if it is aftermarket, is it connected in anyway to the tail light wiring on the truck, either through connectors or hardwired. What could be happening is that the trailer lights are overdrawing power causing the truck lights to not work. Converting the trailer to LED lights would reduce the current draw if that is indeed the problem. It could also be...
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  • If Vehicle Headlights are Set to Auto Will It Light Up the Trailer Lights
    As long as the auto mode for the vehicle headlights energizes the same running light circuit that is used by the tow package wiring running light circuit, then yes, it will work. To check if this is the case you will need to set the vehicle lights to auto, probably at night so the head lights come on, and then use a circuit tester such as # 40376 to test the vehicle side trailer connector to see if the running light pin is energized.
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    Do not despair. I will be happy to help. This does sound like a classic ground issue but there could be some other factors involved as well. So we will start with the easy things to check and work our way from there. Testing the trailer connector on the truck was a good start. The next thing you will want to do is plug in the adapter to the 7-Way and test the pins on it. If they are incorrect, there could be a problem with the adapter. Next, you can plug in the trailer and test the wires...
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  • Will Optronics Sealed Oval Trailer Stop Light Replace the Bargman Light on my 2002 Homesteader
    It will fit Bargman part # 40-06-001. Since your light is a Bargman unit, you will just need to find the part number on it somewhere. The DOT 97 number has to do with Department of Transportation regulations and you will see similar numbers stamped on most lights. If you find 40-06-001 on the light, then this Optronics light will work as a direct replacement. If you find a different part number, please write back and I will help you find exactly which light will fit.
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    It very well could be a direct replacement. In order to find out, remove the light from your trailer and check for a part number on the back of the fixture. The Optronics light, part ST70RB, is a direct replacement for the following lights: Uni Bond # SE2238R Wesbar # 203561 Truck Lite # 60202R Grote # 52182 Peterson # 421R Bargman # 40-06-001 Check your light or contact Triton with your trailer VIN or serial number, and they should be able to tell you what light was used.
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