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

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

Part Number: ST8RB
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$5.55
Retail:$17.98
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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. Great 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 etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - ST8RB

Highlights

  • One Light, 6 Functions: Provides stop, turn, tail, rear reflex, side marker, and side reflex lighting.
  • Quick Wiring Setup: Stripped wires lock into back ports for a clean, tool-free connection.
  • Solid Mount and Ground: Two 2-inch spaced studs secure the light and provide grounding.
  • Easy Bulb Replacement: Standard 1157 bulb installs behind a shock-proof socket.
  • Built-In Reflectors: Reflex lens design removes need for separate reflector pieces.
  • Durable Build: Polycarbonate housing and acrylic lens withstand road vibration and use.

Features to know about

Brighter and Safer on the Road: Six-Function Incandescent Lighting

This 5-5/16" x 4-9/16" Optronics combination tail light is built to handle all six lighting functions trailers under 80" wide need—stop, turn, tail, rear reflex, side marker, and side reflex. With a red lens over dual incandescent bulbs, it gives off bright and clear signals so other drivers can see you from all angles. Built-in reflectors take care of visibility even when the lights aren’t on, so there’s no need for separate reflector mounts.

Simple Electrical Hookup: Quick Connect Wiring

Wiring couldn’t be easier. The back of the housing has quick connect ports—just strip your wires, push them into place, and you’re done. The two mounting studs do double duty by grounding the light through the trailer frame, which means fewer wires to fuss with and no extra ground wire to run.

Built to Last: Shock-Proof Socket and Tough Housing

Rough roads can take a toll on trailer lights, but this one’s ready for it. The socket inside is shock-proof to protect the bulb from bumps and vibration. Its durable polycarbonate housing and acrylic lens stand up well to impact, keeping the light sealed and protecting the components inside for long-term reliability.

Easy Replacement Fit: Standard Stud Mount Design

Measuring 5-5/16" long x 4-9/16" wide x 2-7/8" deep, this square light mounts using two studs spaced 2" apart on center. That standard spacing makes it an easy direct-fit replacement for Uni Bond #TL4400, Wesbar #3060, Grote #52302, and Peterson #440 lights. It installs securely without extra brackets and is ready for the passenger side position.

Low Power Draw with Dependable Output

At 12.8V, it draws just 2.5 amps for stop/turn and 1 amp for tail light operation—plenty of brightness without overloading your trailer circuit. The design keeps power use modest while delivering consistent illumination every time you tow.

Specs

Configuration

  • Configuration: passenger side
  • Driver side: ST9RB (sold separately)

Dimensions

  • Overall dimensions: 5-5/16" long x 4-9/16" wide x 2-7/8" deep
  • Distance between mounting studs (center on center): 2"

Technical diagram of Optronics ST8RB combination trailer tail light showing labeled dimensions, mounting points, and wiring connections for the right-hand passenger side light.


Electrical

  • Power draw at 12.8V (Stop/turn): 2.5 amps
  • Power draw at 12.8V (Tail): 1 amp

Warranty

  • Warranty: 3-Year warranty

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

Alternate part number: ST-8RB





Customer Satisfaction Score:

Ratings & Reviews

4.8

1289 reviews
Review sort icon
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.

by:

The trailer lamp I purchased from etrailer is exactly what I needed to replace
a broken lamp on my carry on trailer. The replacement part is exactly the
same part that is currently on the trailer. Very easy to install and works
properly. Thanks etrailer.

Larry profile picture

Larry

6/5/2019

The lamp is still working fine. Thanks



by:

Ordered and delivered in 3 days. Trying to give my business to someone other than Amazon.



by:

Very good trailer light. Easy to install, self clamping wire inserts sped up the installation.

Folks at etrailer.com were prompt at shipping and kept me informed through emails.

Robert R. profile picture

Robert R.

2/2/2015

Working great after one year. If I need to change the other light, Ill order another from your website.



by:

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.

Terrell P. profile picture

Terrell P.

7/8/2020

Still working great. No problems at all



by:

Good part / Fast Shipping



by:

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.

Catherine profile picture

Catherine

10/3/2019

Still good. Thanks!



by:

My order came very fast, and I was very satisfied with the lights.



by:

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



by:

Good replacement lights



by:

Products were as advertised. Easy to work with. Thanks Etrailer!



by:

Good price and quality



by:

Perfect match to my original but broken tailight



by:

What we needed.



by:

Looks good. Unfortunately it is a oassenger side taillight, and I need a driver’s side. I did not under show to differentiate on the purchase order.



by:

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!



by:

I recently purchased a light from etrailer.com-->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.



by:

product was what was ordered



by:

Perfect fit. Ten minutes from arrival to fully installed. Exact replacement.

Randall profile picture

Randall

8/24/2025

Those trailer lights never work right. The bulbs comes loose and it’s nearly as impossible to get the oriented correctly after come out of the socket. I switched to LED lights.



by:

Works perfect



by:

Finding this replacement part was a God send. The original was impossible to repair and work.



by:

Great product. Works wonderfully well. Thanks



by:

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 etrailer.com.

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



by:

Very speedy service. Perfect replacement part.



by:

The product arrived in good shape and in a timely manner. The product price and shipping very reasonable. Would definitely buy from etrailer.com



by:

Exact replacement for my trailer. Website is easy to navigate. It you need a trailer light, chances are they have you covered. Shipping was quick, only took a few days. etrailer.com for the win.


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See what our Experts say about this Optronics Trailer Lights

  • 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...
  • 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...
  • 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
  • Preferred Method of Grounding Trailer Lighting Circuits
    Running a direct ground up to the trailer tongue or junction box would certainly work, but the only time I'd see that as being necessary is if the lamps were connected to a non metallic structure or a metallic structure that wasn't directly connected to the trailer frame. If the lamps aren't connected to a metal structure in direct contact with the trailer frame, you can use a short length of # DW02359-1 wire with a # DW05702-1 ring terminal on each end to serve as a jumper wire that joins...
    view full answer...
  • Removing 1157 Light Bulb from Optronics Trailer Light
    The bulb that's in the # ST8RB light is an 1157 like part # A1157B. To change the bulb remove the front lens by taking off the screws and gently prying the lens away. Then to get the bulb out you'll need to push in on it a bit and twist the bulb.
    view full answer...
  • Do LED Trailer Tail Lights Have A Ground Wire Or Do They Ground Through Mounting Hardware?
    There are two different styles of LED trailer tail lights. Some are like the Optronics LED Combination Trailer Tail Lights # TLL160RK and have a ground wire on each light which needs to be grounded to the frame, and the other two wires connected to the tail light and brake light/turn signal wires on your trailer. There are other styles of tail lights that do not have a ground wire and instead get the ground through the mounting hardware. Both styles install by wiring the tail light and...
    view full answer...
  • How to Change Light Bulb in Optronics ST8RB Trailer Taillight
    Changing the bulb is simple. Remove the screw on each corner of the front of the lens and gently pry the lens away from the housing. Be careful not to damage the gasket between the lens and the housing as doing so will allow water into the interior of the lamp. With the lens removed, you can push in on the bulb and twist it clockwise then pull the bulb free. Install the replacement # A1157B bulb in reverse order..
    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
  • Utility Trailer Light Wiring Diagram and Required Parts
    I have attached two basic trailer light wiring diagrams of utility trailers for you to check out. The difference between the two diagrams is the type of wiring harness that is being used. Diagram 1 shows a traditional wiring layout with jumper wires to provide running light functions for both sides of the trailer and Diagram 2 shows a wishbone harness. The wishbone harness has two running light wires, one for each side of the trailer. Diagram 2 is the preferred method and it is more common...
    view full answer...
    Image 1 for Image 2 for
  • 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
  • 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
  • Replacement Tail Light Assemblies for 1976 Argosy Camper
    The issue that you're going to run into here is that the lip that you removed is designed to allow you to mount lights on the back because of the curved ends. Because it's such a smooth curve there, you're not going to be able to use something like the Bargman Wraparound Clearance/Side Marker Light - 86 Series - Red - Black Base # 30-86-202. With that said, I'll mention two options for you that you could likely make work by moving the electrical wiring in a bit. First, you could use the...
    view full answer...
    Image 1 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...
  • 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...
  • Replacement for Old Trailer Square Tail Light 4-5/8" x 4-5/8"
    I might have an option for you but without more detail, like a photo, it would just be a guess. That said, the size you mentioned is pretty common more or less for square trailer tail lights like the Optronics Combination Trailer Tail Light part # ST8RB for passenger or part # ST9RB for driver. If this is what yours looks like, I recommend using these as the two stud mounting pattern is pretty standard so don't get bogged down in the small dimensional differences. In regards to a replacement...
    view full answer...
  • Installation of Bulb in Optronics Trailer Light
    The Optronics Trailer Light # ST8RB for the right hand side and # ST9RB for the left has a shockproof socket for the bulb to insert into. The replacement bulb is # A1157B.
    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
  • 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...
  • 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...
  • 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...
  • Do Trailer Taillights Light Up When Vehicle Presses Brake Pedal
    Yes, trailer brake lights are supposed to light up brighter when the tow vehicle applies the brakes. They are designed to work just like a vehicle's taillights that have the brake lights and the running lights on the same circuit. If you check out the review video link I attached you can see how a very standard trailer taillight # ST8RB lights up with the running lights and the stop/turn signal.
    view full answer...
  • Recommended Trailer Lights and Parts Needed to Install With Wesbar 4 Pole Flat Connector
    When using the Wesbar # W787274 you can just run a jumper wire for the running lights on the other side of the trailer; you're likely going to want to split the jacketing so that you can run the tail/blinker/brake light wires down each individual side of the trailer to allow for easier installation. If you need butt connectors you can use the Deka Heat Shrink Butt Connectors # DW05745-5 to make your wiring connections, and you'll need 14 gauge wiring to match the Wesbar harness. For lights...
    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...


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Info for this part was:

Employee Mike L
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Mike L
Employee Sarah L
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Sarah L
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Employee Michael H
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Michael H
Employee Jameson C
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Employee Adam R
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Adam R
Employee Adele M
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Employee Wilson B
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Employee Brian T
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Employee Dustin K
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Employee Randy B
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