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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: $5.04
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Shipping Weight: 0.27 lbs
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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. Great 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 1-800-940-8924 for expert service.
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Optronics Trailer Lights - ST70RB

  • Tail Lights
  • Oval
  • Incandescent Light
  • Red
  • 6-1/2L x 2-1/4W 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   (1258 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.


Exact replacement for my KARAVAN snowmobile trailer. Took under 20 minutes to install/hookup.
While replacing I noticed other light wiring were loose. I redid those as well, and now all lights are working!
Thnx ET
and George!


I like the Optronics Brand lights


I broke one of the lights on a 2009 Echo ATV trailer. These lights were an exact fit. The connectors were identical to the broken light which provided a quick plug and go solution. I purchased a new grommet to go along with the new light and it fit as it should. Simple and quick installation. I purchased 2 of these so that I would have a Fresh lens on both sides. The description on the website made an easy solution.


I was easily able to locate the trailer lights I required on this excellent website. Delivery was fast and the product was excellent. Thank you!


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


Exact replacement, and easy to install.


Direct replacement and easy installatio n!


Quick easy installation. Perfect fit. Less than 5 minutes start to finish. Light was reasonably priced and delivered quickly.


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!


They were the correct size. I received the order promptly


Great pricing and super quick shipping!!


great sale-just what we needed!!




I looked for this part for our trailer in several places and was the best by a land slide! The price was at least a quarter of all the rest the delivery even came a day early. I would recommend them with my eyes closed!


Excellent service, Fast shipping


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


Fats accurate service.




Perfect fit


It was the size described, so fit perfectly and is still working.
Thank you.


Hard to find part, in stock! Perfect replacement for old part with fast shipping. Keeping trailer original lighting so as to not have to rebuild electrical system.


Perfect replacement using factory wiring and connectors


Reasonable price and it plugged right in and worked.


It's been 1 year and still working perfectly. The fit on my trailer was spot on!

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • 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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  • Malfunction of Trailer Blinker Lights When Lights On Truck Are On
    It sounds like there may be a loose or bad ground on the trailer light. When the lights on your truck and trailer are on and you use the brakes or turn signal, the system is at its max load of amps and with a bad or weak ground, the light cannot support all the power of both the running lights and turn signal. I would start by checking the ground connection on both lights to make sure there is contact to a clean, rust-free metal surface. Also, if you have a plastic license plate holder,...
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  • Troubleshooting Left Turn/Brake Circuit on Trailer
    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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  • Replacement Trailer Taillight Recommendation for Bargman 4006001
    The correct replacement light you need for the Bargman 4006001 that you referenced is the part # ST70RB. 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
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  • Is 6-1/2" Oval Trailer Stop, Turn and Tail Light, 3-Function # ST70RB Sealed
    Yes, since the Sealed, 6-1/2" Oval Trailer Stop, Turn and Tail Light, 3-Function # ST70RB is sealed it does not have a replaceable bulb that you could swap out. The good news is this is a lower cost assembly so a replacement bult would be about the same price as this.
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  • Will Optronics 3-Function Tail Light ST70RB fit my 2008 Triton AUT Auluminum 14 Foot Trailer
    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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  • Troubleshooting Trailer Running Lights That Do Not Work When All Other Trailer Lights Work
    When all trailer lighting functions work correctly except for the running lights this usually means a problem with grounding. Light functions such as turn signals and brake lights do not remain on continuously so they pull less current. Running lights on the other hand remain on continuously and so they pull more current. if you main trailer ground is not strong enough there may not be enough power for the taillights. Check your main trailer ground to ensure that the white ground wire...
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  • What is the Approximate Amperage Draw of the ST70RB Sealed Oval Trailer Light
    The Sealed Oval Trailer Stop, Turn and Tail Light, item # ST70RB, uses an 1157 automotive style bulb with two filaments. The bright filament is rated at 21 watts and the dim filament is rated at 5 to 6 watts. With the filament wattage, we can determine the amp draw of the bulb. Amperage equals watt rating divided by input voltage. Assuming a 12.8 volts input in all cases, with both filaments lit, the amperage draw would be approximately 2.1 amps. With only the dim filament lit, the amp...
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  • Can the Day Time Running Lights and Automatic Headlights be Disabled on a 2000 GMC Sierra
    If you are talking about the day time running lights you can disable them by pressing the dome light override button 4 times within 6 seconds. You should hear a chime. However this has to be done every time the ignition is turned off and turned back on again. This should also disable the automatic head lights that would come on when it gets dark enough. You would then need to manually switch the headlights on when required. I found this information in the owners manual, section 2-50, for...
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  • How Would I Replace a Light Bulb on Lamps Used on Cargo Carrier Light Kit, Part Number 20174?
    The lamps used in the Cargo Carrier Light Kit, part number 20174 are submersible, and are therefore permanently sealed. The bulbs are not replaceable. The lamp assembly must be replaced. You will need part number ST70RB.
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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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  • Replacement Trailer Taillights for Echo Elite Trailer
    I looked up pictures of your Echo Elite trailer and what you need is the part # ST70RB as an exact replacement.
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  • Troubleshooting Left Side Stop and Turn Signal Light Not Working on a Flatbed Trailer
    My first reaction is a weak ground connection for the left side light. If the left turn and brake signal are on a separate circuit but a ground connection that is not sufficient, a number of things can go wrong, including one of the lights functions not working, while testing shows 12 volts power. I had this same issue on a utility trailer some time ago also, and it ended up being a frayed wire that was just barely making contact to the trailer frame. In my case the issue was intermittent...
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  • Can Bulb be Changed in a Truck Lite 60 Series Trailer Light
    It looks like there are different versions of the 60 series tail lights from Truck Lite. If you have a sealed version meaning there is no way to open up the light then the bulb cannot be replaced. If you can access the inside of the light it looks like it takes a 2057 bulb available at an automotive supply store.
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  • Trailer Brake Lights Do Not Work when Running Lights are On
    First, the 4-Way on your trailer is what is called a wishbone harness. It just has 2 wires for the running light circuit to go to each side of the trailer so that you do not have to run a jumper from one side of the trailer to the other. The issue here sounds like a ground problem. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side...
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  • After Adding New Lights and Rewiring Trailer the Lights Will Not Light Up
    This does sound like a ground problem since when you touch lights to the bumper they work. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds...
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  • How to Pick Out Replacement Hub for Wave Runner Trailer
    We don't have specific hub info for the trailer that came with your 2000 Yamaha Wave Runner, but we can help you pick out the correct replace hub. In order to pick out the correct hub assembly for a trailer you are going to need know a few key pieces of information. The first thing you will need to know is the bolt pattern of your hubs. This is so you get a hub that is compatible with your wheels. I attached an FAQ article on determining bolt pattern for you to check out. Next thing you...
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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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    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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  • 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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    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 Installing New LED Lights on Trailer and Only All Work With Headlights On
    Sounds like you have the stoplight and the running light circuits wired backwards on your new trailer lights. I'd try switching the circuits you have ran on the light assemblies to see if that helps get the lights to work again.
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  • Replacement Incandescent Tail Lights for Rockwood Pop-Up
    We can help you select replacement tail lights for your trailer. The linked page will show you all non-LED (incandescent) tail lights. You can use the filters on the page to sort the products by shape, size, etc. For example, # ST70RB is a popular red oval-shaped stop/turn/tail light. Since I don't know the model year and version of your truck I suggest you refer the question about changing out its lights to your local dealership. If the truck was made with incandescent lighting then it's...
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  • Troubleshooting No Brake Lights on 3-Wire Rear Trailer Light
    On this light the white wire is ground, the black wire is tail light, and the red wire is stop/turn signal. If you don't have the turn signal on this one light, the we assume that you don't have brake light on that light either. Since we have tail lights we can assume that the ground is not the problem. Let's first determine if this problem is on the tow vehicle side or the trailer side. The easiest way is to connect the trailer to another vehicle and see if all of the signals work...
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