bing tracking image
  1. Trailer Lights
  2. Optronics
  3. Tail Lights
  4. Oval
  5. Incandescent Light
  6. Red
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
lowest price pledge
Our Price: $5.65
You Save: 62%
Trailer Lights
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.27 lbs
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

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

Need help with installation?
Locate installers near me
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 1-636-306-4830 for expert service.
  • All Info
  • Reviews (1116)
  • Q & A (0)
  • Photos
  • Why etrailer?

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 Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (1116 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.


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..


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!


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


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.


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


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!


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..


Excellent support and service! Got exactly what I needed


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 !


What great service. The purchase to the delivery was flawless. I never expected to purchase this own for such a reasonable price. When it arrived it was exactly what I was looking for

Thank you


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


Worked right out of the box and has been working for a year now on the road or when putting boat in the water. Great product at a great price with quick service.


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


These are 17 dollars at [online} and the most common trailer light I need to replace on trailers. Excellent deal which makes me a very happy customer I bought 20 of them and saved a fortune thank you etrailer for being priced reasonably.


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


Great product, fit perfectly.


Great product. As described with no is sues.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • 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...
    view full answer...
  • 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...
    view full answer...
  • 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.
    view full answer...
  • 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.
    view full answer...
  • Trailer Lights Not Working After Cleaning Grounds and Making Fresh Wiring Connections
    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...
    view full answer...
  • 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...
    view full answer...
  • 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...
    view full answer...
  • 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...
    view full answer...
  • 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...
    view full answer...
    Image 1 for
  • Replacing Flush-Mount Trailer Tail Lights
    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...
    view full answer...
  • 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.
    view full answer...
  • 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.
    view full answer...
  • 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.
    view full answer...
  • Can the Bulb in Sealed, 6-1/2 Inch Oval Trailer Stop, Turn and Tail Light, # ST70RB be Replaced
    Because Sealed, 6-1/2 Inch Oval Trailer Stop, Turn and Tail Light, # ST70RB, is a sealed tail light, the bulb cannot be replaced. You would need to replace the whole tail light if the bulb needs to be replaced.
    view full answer...
  • 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,...
    view full answer...
  • 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...
    view full answer...
  • 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...
    view full answer...
  • 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...
    view full answer...
  • 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.
    view full answer...
  • Replacing Truck-Lite Stop/Turn Light on Horse Trailer
    That light looks to be very similar to the Optronics light part # ST70RB. This light is 6-1/2" L x 2-1/4" W x 2-3/8" D which is a very common trailer light size so there is a good chance it's what you'd need.
    view full answer...
    Image 1 for
  • 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...
    view full answer...
    Image 1 for
  • 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...
    view full answer...
  • 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...
    view full answer...
  • Can Trailer Taillights All Ground Back to the Trailer Connector
    Yes, what you did is definitely okay. The ideal ground setup for a trailer's wiring is to run each of the wires back to the ground wire of the trailer connector. Since this can be somewhat time consuming (and wire consuming), most trailer lights will just ground through the mounting hardware. Either way can work well, but what you did is actually the better route.
    view full answer...

< Previous
123. . .6

Do you have a question about this Trailer Light?

  • Why

    At we guarantee:
  • Highest quality trailer lights for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer light information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Joe V
Installed by:
Joe V
Employee Cole B
Installed by:
Cole B
Employee Shane H
Installed by:
Shane H
Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Patrick B
Expert Research:
Patrick B
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Reno H
Expert Research:
Reno H
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Victoria B
Expert Research:
Victoria B
Employee Andrew K
Video by:
Andrew K
Employee Jacob H
Video by:
Jacob H
Employee Joshua S
Video Edited:
Joshua S
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T

At 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.

Product Experts Available Now!
Call 1-636-306-4830