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Optronics Combination Trailer Tail Light - 6 Function - Incandescent - Red Lens - Passenger Side

Optronics Combination Trailer Tail Light - 6 Function - Incandescent - Red Lens - Passenger Side

Item # ST8RB
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Optronics Combination Trailer Tail Light - 6 Function - Incandescent - Red Lens - Passenger Side Red ST8RB
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5-5/16" x 4-9/16" Square. Incandescent trailer tail light serves 6 functions on trailers under 80" wide: brake, tail, turn, side marker, side reflector, and rear reflector. Shock proof sockets. Stud mount. Quick connect wiring. Lowest Prices for the best trailer lights from Optronics. Optronics Combination Trailer Tail Light - 6 Function - Incandescent - Red Lens - Passenger Side part number ST8RB can be ordered online at or call 1-636-306-4830 for expert service.
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  • Reviews (497)
  • Q & A (0)
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  • Why etrailer?

Optronics Trailer Lights - ST8RB

  • Tail Lights
  • Square
  • Incandescent Light
  • Red
  • 5L x 5W Inch
  • Surface Mount
  • Stop/Turn/Tail
  • Side Marker
  • Side Reflector
  • Rear Reflector
  • Non-Submersible Lights
  • Optronics

5-5/16" x 4-9/16" Square. Incandescent trailer tail light serves 6 functions on trailers under 80" wide: brake, tail, turn, side marker, side reflector, and rear reflector. Shock proof sockets. Stud mount. Quick connect wiring.


  • Trailer tail light serves 6 functions on trailers less than 80" wide
    • Stop, Turn, Tail, Rear Reflex, Side Marker, and Side Reflex
  • Built-in reflex reflectors remove the need for a separate reflector
  • Shock-proof socket protects the bulb
  • Incandescent bulb can be easily replaced
  • Red lens over 2 bulbs
  • Durable polycarbonate housing and acrylic lens
  • Stud mounts on trailer with included studs
  • Quick connect wiring - simply insert stripped wire into holes for a secure connection
    • Light grounds through mounting studs


  • Configuration: passenger side
    • Driver side: ST9RB (sold separately)
  • Dimensions: 5-5/16" long x 4-9/16" wide x 2-7/8" deep
  • Distance between mounting studs (center on center): 2"
  • Power draw at 12.8V:
    • Stop/turn: 2.5 amps
    • Tail: 1 amp
  • 3-Year warranty

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

  • Uni Bond # TL4400
  • Wesbar # 3060
  • Graote # 52302
  • Peterson # 440

Optronics ST8 Series Universal Mount Combination Tail Light Diagram

ST8RB Optronics Universal Combination Tail Light for Trailers Under 80" - 6 Function - Incandescent - 2 Bulbs - Right Hand

Alternate part number: ST-8RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Optronics Combination Trailer Tail Light - 6 Function - Incandescent - Red Lens - Passenger Side - ST8RB

Average Customer Rating:  4.8 out of 5 stars   (497 Customer Reviews)

5-5/16" x 4-9/16" Square. Incandescent trailer tail light serves 6 functions on trailers under 80" wide: brake, tail, turn, side marker, side reflector, and rear reflector. Shock proof sockets. Stud mount. Quick connect wiring.


Since the bolts were sticking out, packaging should have been paid arrention to! The bolts scraped the adjacent lenses during transport. Otherwise, the product is what I wanted. I could have bought it elsewhere for $1 extra, no shipping costs, but they were out of the product. The prices was not that great, adding the shipping cost. But overall, I’m pleased.


Jeezy way the wires are installed. Bid I put a bunch of dialectic grease around them hopefully they stay dry for a long time period


A just right replacement for a broken trailer taillight. Attractively priced, reasonable shipping cost, and quick delivery.


These light were a good replacement set for my Home Depot Snowbear trailer taillights. Best price I found for this or similar was here at

Pic is not of my own trailer but is the same model. You can see the configuration of the taillights.


The tail lights are exactly what I needed. Thank you


This was an exact replacement for the one I replaced and everything worked perfectly.


Products that I purchase from etrailer are great. Have never had any issues with anything that I purchased from etrailer.


I reveived the trailer lights in a couple of days, as you indicated when I placed the ordered.
The construction of lights were better than the lights I had on the trailer and at a better cost.

Scott - 11/01/2021


I recently purchased a light from>great price, same day order filling with email update, fast shipping in normal mode... two follow up emails...thank you for great service, I'll be sure to bookmark your site.


Using computers to do almost ANYTHING is a pain in the ass!Placing this order was fast, easy and effective. I received the order a week ahead of what they told me. BRAVO etrailer. FINALLY, someone who doesn't cost me three hours work to get a part that I need. I'll BE BACK!


The light is a well built taillight and works great. The service at etrailer is always great.... as well as fast, easy and delivered quickly. What a great place to get all your trailer needs. Thank You!


It was as advertised, good price, arrived fast and worked well. All good!


Exactly what I ordered. Very fast shipping. Best price.


Fairly priced, exact replacement part, fast shipping. I definitely recommend this vendor !


perfect for my trailer


Very easy to find what i wanted on their website. Price was great and it came in a timely matter. I will shop with ETrailer again great company. Thank You


works as expected


Very easy to install.


Was delivered on time.Works perfectly and was very easy to install.

The lights were a great fit for my trailer.They work great and look nice. love your company and like doing business with you.Thanks!!
Bill - 05/05/2022


Perfect replacement


I know I'm breaking them extremely fast, so for me it is a good choice. just a few $.


Great price and fast shipping. Very easy and fast to install and look great too. Thank you!

It’s been a year and my Taillights are holding up great and still look good. Very pleased.
Rick - 03/21/2022


Product was a replacement for Carry-on trailer light that was damaged. Product was OEM (Optronics) and very reasonable in price. Product was packed well and came undamaged. Highly recommended.


I worked with a very helpful Optronics employee to determine the correct light to replace a smashed right taillight on my small utility trailer; she recommended I then order from etrailer. It's a perfect, inexpensive match for the destroyed light, and installed quickly and easily.

Still good. Thanks!
Catherine - 10/03/2019


it is the exact fit. installed it on a small trailer, wired it and it works great. I now have turn signals and brake lights.

Still working great. No problems at all
Terrell P - 07/08/2020

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Do Trailer Lights have to be Grounded to the Main Trailer Connector Ground
    As long as each of the lights on your trailer are grounded to a clean, bare metal surface then you will be good to go. On aluminum trailers though sometimes a jumper ground does need to be run to the main trailer connector ground. But not with steel frames.
    view full answer...
  • Availability of Replacement Lens for Do-Ray 169
    I was not able to find any specifics about lighting products from Do-Ray, nor one for a lens with the reference number 169. If you can submit a photo of the part you need along with measurements I'll be glad to check for a replacement. If you prefer you can choose a new light fixture using the link provided. The link will take you to our main page for trailer lights where you can use the filters in the left margin to narrow the results shown based on the color, shape and type of light...
    view full answer...
  • Can the Bulb in Trailer Stop, Turn and Tail Light ST8RB Be Easily Replaced
    The bulb # ST8RB trailer tail light can definitely be replaced, and to do so is not difficult. The face of the light taken off by removing four small screws, and once this is done you have access to the bulb socket and can proceed with changing the bulb. The replacement bulb for this light would be part # A1157B.
    view full answer...
  • How Is Trailer Wiring Connected to the Optronics Trailer Lights # ST8RB
    Stripped wire get inserted into the ports on the back of the Optronics Trailer Lights # ST8RB and that is how they are connected. Fast forward to the 2:15 mark of the video I attached to see how this is done.
    view full answer...
    Image 1 for
  • Can the Optronics Tail Light # ST8RB Be Used on the Left and Right Side of a Trailer
    You should not have a problem using the Trailer Stop, Turn and Tail Light, 6-Function, Right Hand # ST8RB on the left and right hand sides of your trailer. It would be just a matter of wiring up the lights accordingly. On the # ST8RB there is an arrow that points to a wiring hole with the word Green. On the right side of your trailer this will be correct, but on the left side of the trailer you would need to install the yellow wire there.
    view full answer...
  • When Should My Trailer Lights Be Working
    When the vehicle is not running and the key is in the off position, the only functions that should be working on your vehicle and trailer will be the headlights and tail lights as they are not tied into the vehicle's ignition system. If you vehicle's brake lights come on when the brake is applied, then your trailer brake lights should come on as well. It is likely the turn signals will not function while the vehicle is not running and the key is in the off position. When the vehicle is...
    view full answer...
  • Replacement Square Stud Mount Trailer Lights for Utility Trailer
    The Combination Trailer Tail Light part # ST9RB for driver side or part # ST8RB for passenger side is just what you need to replace the tail lights on a utility trailer. The lights mount via two studs which are 2" apart so they will be a direct replacement. In regards to installation, the lights ground though the studs so you only need to attach the stop/turn and running light wires for each side.
    view full answer...
  • Is the Optronics Tail Light # ST8RB Compatible with 3 Wires for Trailer Light Functions
    The Optronics tail light part # ST8RB that you referenced actually doesn't come with any wiring at all. The back of the assembly has holes in it for quick connecting of your light functions. Simply insert the stripped wire into the appropriate slot. This is the passenger side light assembly. For the driver's side assembly you will need part # ST9RB. Attached are some reviews videos and an installation video for you to reference.
    view full answer...
  • Difference Between Optronics Left Hand # ST8RB and Right Hand # ST9RB Trailer Lights
    It sounds like you are referring to the Optronics Right Hand Trailer Light # ST8RB and the Left Hand # ST9RB. The only difference between the two assemblies is that the Left Hand/Driver's Side unit features an additional license plate light to illuminate the trailer's license plate. I have attached a couple short video demonstrations on these lights that you can also check out.
    view full answer...
  • Is Bulb Already Installed on Trailer Stop, Turn and Tail Light
    Yes, the Trailer Stop, Turn and Tail Light, 6-Function, Right Hand # ST8RB does come with the bulb installed. The matching light for the left side of your trailer is the Trailer Stop, Turn, Tail and License Plate Light, 7-Function, Left Hand # ST9RB, which also has the bult installed.
    view full answer...
  • Locating Left Side Assembly for Optronics Trailer Light # ST8RB
    The Optronics Trailer Stop, Turn, and Tail Light # ST8RB referenced in your question is for the right side of the trailer. For the corresponding Left Hand assembly, you will just need part # ST9RB, which also includes the needed license plate light. These are really nice, red square trailer lights that are corrosion resistant and feature a replaceable lens and bulb. I have attached a couple short video demonstrations on these lights, along with an installation video that you might find...
    view full answer...
  • How to Connect Trailer Wiring to Optronics # ST8RB and # ST9RB Trailer Tailllights
    If you have the Optronics # ST8RB and # ST9RB, no connector is needed. On the back of the taillight, there is a hole for the stop/turn and a hole for the running light wire. Each of these holes will have a smaller hole directly below it. Strip back the insulation on the wire by about a 1/4 inch, twist the copper strands of each wire tightly and push it into the hole in the back of the lamp as you're pushing a small screwdriver into the smaller hole. Once the wire is fully inserted, remove...
    view full answer...
    Image 1 for
  • How To Connect Optronics Trailer Lights # ST8RB and # ST9RB To a Trailer
    The quick connect feature on the Optronics Light, part # ST8RB, and part # ST9RB, means that you can connect the wires by inserting them into the four holes on the back of the light. It is not referring to a separate part. The wires would be stripped about 1/4 inch and pushed into the correct hole on the back of the trailer light. The holes are marked with the tail light function that the hole provides. The wire when pushed in the hole will automatically lock in place and give you a quick...
    view full answer...
  • How to Wire Optronics Right-Hand Trailer Stop, Turn and Tail Light, Part # ST8RB
    The Optronics Right-Hand Trailer Stop, Turn and Tail Light, Part # ST8RB, connects with two wires. On the rear of the housing are holes to accept bare wire and underneath each one is a smaller hole that serves as a wire release; just insert a small pin (or something like a paper clip) to release the wires. The left-hand matching light is part # ST9RB. If you refer to the included photo illustrating a trailer-side 7-way connector you will be able to see which two wires from the connector...
    view full answer...
    Image 1 for Image 2 for
  • Comparing the Power Draw of LED Trailer Tail Light STL8RB and Incandescent Version ST8RB
    LED lights draw considerably less amperage than incandescent lights. They also run much cooler. These 2 features are why LED lights last so long. The incandescent version of # STL8RB is # ST8RB and it draws 2.5 amps for the stop/turn signal functions and 1 amp for the running light functions. And the LED version draws 0.259 amps for stop/turn functions and 0.062 amps for running light functions.
    view full answer...
  • Replacement Tail Light for 2000 TrailStar Bass Tracker Pro Boat Trailer
    I looked up some photos of a 2000 TrailStar Bass Tracker Pro Boat Trailer and it most likely uses either the Optronics Combination Trailer Tail Light part # ST16RB for passenger and part # ST17RB for driver side or the Optronics Combination Trailer Tail Light part # ST8RB for passenger side or part # ST7RB for driver. Unfortunately, you'd have to replace the entire tail light as we'd not have just the lens.
    view full answer...
  • Are the ST8RB and ST9RB Submersible Lights
    I have a solution for you, but neither the # ST8RB nor # ST9RB are submersible lights. Instead, you'll want to use the # ST6RB and # ST7RB - which are the submersible versions of those lights. These are still incandescent tail lights that look exactly the same, have the same dimensions and are the same 2 wire electrical system, they're just sealed up so that they can be safely used on boat trailers.
    view full answer...
  • Replacement Tail Light Lens for ST7RB and ST8RB Lights
    It looks like you previously purchased the Optronics Combination Trailer Tail Light - Submersilbe - 7 Function - Square - Driver Side # ST7RB, so you can use that to replace your driver's side light or the Optronics Combination Trailer Tail Light - 6 Function - Incandescent - Red Lens - Passenger Side # ST8RB for the passenger side. If you just need to replace the lens, that part is # A8RB for the front lens and # A9RB for the side lens.
    view full answer...
    Image 1 for
  • Recommended Replacement Trailer Lights With Side Lights For Small Utility Trailer
    We have just what you are looking for. I recommend the LED Submersible Trailer Stop, Turn and Tail Light, part # STL8RB. This is for the right side of the trailer and is a stud mounted LED light. It has the side marker light that illuminates when the running lights are powered. For the left side of the trailer you will want part # STL9RB. I have attached a product review video and have also attached a drawing that shows the dimension for these lights you can take a look at.
    view full answer...
    Image 1 for
  • Running Lights Function but Brake and Turn Do Not on a 2006 Carlson Utility Trailer
    It could definitely be a ground issue. Since you were able to duplicate the same result with the same trailer on two different vehicles, than it is pretty safe to say the problem is somewhere on the trailer. I would start with the trailer connector and work back. Trace the ground wire, usually white, back from the connector. Make sure it has a good clean connection to the metal of the trailer frame. Paint, rust and corrosion can insulate connections so make sure it is good metal to metal...
    view full answer...
  • Troubleshooting Trailer Running Lamp Circuit on 2005 Ford F Series
    I am assuming you are speaking of the 7-way trailer connector. Use a circuit tester like part # 40376 on the pin in the 11:00 position on the trailer connector. If you do not have voltage on that pin while the headlights or running lights are on, you most likely have a blown fuse. The lid of your fuse box should have a legend showing which fuses protect which circuit. This information should also be provided in your owners manual. The fuses might not necessarily be located in the main...
    view full answer...
  • Replacement Taillight Recommendation for Tumbleweed Cyprus Trailer
    Thanks for the picture of your trailer and taillight. From that I can tell you'd need the replacement passenger side trailer taillight part # ST8RB.
    view full answer...
  • Installation Method for Optronics 6-Function Trailer Stop, Turn and Tail Light # ST8RB
    The Optronics 6-Function Trailer Stop, Turn and Tail Light # ST8RB that you referenced does not require a bracket for installation. This light is of the type that uses the two threaded mounting studs, spaced 2-inches apart, to attach to your trailer. These mounting studs also serve a second purpose; they provide the ground connection to complete the electrical circuit. Please refer to the linked video. Certainly if you wanted to mount these with a bracket you could use a simple L-bracket...
    view full answer...
  • Is There More than One Bulb in Optronics ST8RB and ST9RB Trailer Lights
    For the trailer lights # ST8RB and # ST9RB there is only one bulb inside the housing and it is a 1157 like you mentioned. For a replacement you would want the part # A1157B. The light from the one bulb lights up the side and the front of the assembly.
    view full answer...

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