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Tail Light for Trailers Over 80" Wide - 7 Function - Incandescent - Square - Passenger Side

Tail Light for Trailers Over 80" Wide - 7 Function - Incandescent - Square - Passenger Side

Item # ST2RB
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Optronics Stop/Turn/Tail,Side Marker,Rear Clearance,Side Reflector,Rear Reflector Trailer Lights - ST2RB
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6-1/8" x 4-9/16". Incandescent light acts as brake, tail, turn, side marker, side reflector, rear clearance, and rear reflector for trailers wider than 80". Stud mount. Quick connect wiring. 2 bulbs. Lowest Prices for the best trailer lights from Optronics. Tail Light for Trailers Over 80" Wide - 7 Function - Incandescent - Square - Passenger Side part number ST2RB can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (60)
  • Q & A (7)
  • Videos (2)
  • Photos
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Optronics Trailer Lights - ST2RB

  • Tail Lights
  • Square
  • Incandescent Light
  • Red
  • Surface Mount
  • 6L x 4-1/2W Inch
  • Non-Submersible Lights
  • Optronics
  • Stop/Turn/Tail
  • Side Marker
  • Rear Clearance
  • Side Reflector
  • Rear Reflector

6-1/8" x 4-9/16". Incandescent light acts as brake, tail, turn, side marker, side reflector, rear clearance, and rear reflector for trailers wider than 80". Stud mount. Quick connect wiring. 2 bulbs.


  • Square trailer light serves 7 functions for trailers more than 80" wide
    • Stop, Turn, Tail, Rear Clearance, Rear Reflex, Side Marker, and Side Reflex
  • Built-in reflector removes the need for a separate reflector
  • Incandescent bulbs are easy to replace
  • Shockproof socket protects bulbs against damage
  • Durable plastic housing with screw-on lens
  • Red lens covers incandescent bulbs
  • Compatible with 12V DC systems
  • Stud mount to trailer with included studs
  • Quick connect wiring - simply insert stripped wire into holes for a secure connection
    • Light grounds through mounting studs
  • DOT compliant


  • Configuration: passenger side
    • Driver side: ST3RB (sold separately)
  • Dimensions: 6-1/8" long x 4-9/16" tall x 2-7/8" thick
  • Distance between mounting studs (center on center): 2"
  • Bulb type; 1157
  • Number of bulbs: 2
  • Power draw at 12.8V:
    • Stop/turn: 2.5 amps
    • Tail: 1.0 amps
  • 3-Year warranty

Manufacturer Cross Reference
Light will work as an exact replacement for:
Uni Bond # TL4440
Wesbar # 423062
Peterson # M444

Optronics ST2 Series Universal Tail Light Dimensions

Combination Lights for Trailers Over 80" Wide

Flatbed trailer over 80" wide with combination tail lights

If a trailer is 80" or wider at its widest point, then it requires rear clearance lights in addition to basic trailer lights. These clearance lights indicate the width of the trailer when it is viewed from the back.

To meet these requirements on a flatbed utility trailer where the bed extends past the wheels, you can install combination trailer lights that include the rear clearance function. For proper mounting, the lights must be installed at the widest points on the rear of the trailer - one on each corner.

ST2RB Optronics Combination Tail Light for Trailers Over 80" Wide - 7 Function - Incandescent - Square - Passenger Side - Right Hand

Alternate part number: ST-2RB

California residents: click here

Video of Tail Light for Trailers Over 80" Wide - 7 Function - Incandescent - Square - Passenger Side

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Optronics Trailer Lights - Tail Lights - ST2RB Review

Today, we're going to be reviewing part number ST2RB. This is the square trailer light for the right hand side of your trailer, from Optronics. The red square light is going to serve 7 functions for trailers more than 80 inches wide, such as your stop, turn, tail, rear clearance, rear reflex, side marker, and side reflex indicators. It's got a corrosion-resistant design featuring a replaceable lens, as well as replaceable incandescent bulbs. The bulbs are going to use a shock-proof socket, so it's going to guarantee a long bulb life. The stud mounts on the right side of the the trailer with 2 studs. It's inaudible 00:00:33 on the back of the housing. Taking a measurement, the distance between the two, center on center, is going to measure right around 2 inches. This is designed for quick-connect wiring.

You can see here at the top that it's got the exposed portion for the wiring. Wiring is going to be sold separately, or you can use your pre-existing wiring. All you have to do is simply insert the stripped wire into the holes for a secure connection. The light is going to ground through the connection points there on the studs. You can ground straight through that. It's got the nice star-shaped washer there on one side of the nut.

That way, it can get into the surface really well for a nice ground connection. Taking a look at the overall measurements, it's going to give us an overall length of about 6 and 1/8 of an inch, an overall width of about 4 and 9/16 of an inch, and then, measuring the depth, it's going to give us a measurement of about 2 and 7/8 of an inch. We're going to go and connect it to our external power source. That way, you can see what it looks like with power running to it, and with our overhead lights turned off. We're going to go and connect the ground wire. Then, we're going to take our tail lights and hook them in. Then, we'll do the same thing for the stop and turn signal. You can see here that it's going to provide a nice, consistent signal for the tail light function, and then when we apply our brakes, it's going to illuminate a little bit brighter for a nice, consistent brake signal, as well as our turn signal. That's going to do it for today's review of part number ST2RB.

This is the square trailer light for the right hand side of our trailer, from Optronics. .

Customer Reviews

Tail Light for Trailers Over 80" Wide - 7 Function - Incandescent - Square - Passenger Side - ST2RB

Average Customer Rating:  4.8 out of 5 stars   (60 Customer Reviews)

6-1/8" x 4-9/16". Incandescent light acts as brake, tail, turn, side marker, side reflector, rear clearance, and rear reflector for trailers wider than 80". Stud mount. Quick connect wiring. 2 bulbs.


Fast delivery and exactly what I needed. 679704


Works great and easy to install used to replace broken trailer light. 528945


Exactly what I needed and Easy to insta ll. 599834


Unfortunately, I just replaced this light, so it did not make the one year mark. The base where the bulb is supposed to lock into failed and did not keep the bulb tight against the contacts. 575016


Perfect fit as a replacement tail light. Packaging was phenomenal and the light was wrapped in plastic to protect it in shipping. The ordering ease and service provided by etrailer were world-class. I highly recommend their products & services. 111894

Thanks for the follow up. Im very satisfied with the trailer light.
George W - 01/05/2015



no instructions. There were no wires coming out of the unit to attach to the existing trailer wires. I took off the cover and saw that it is quite a poor design. it's really no wonder why they are only $6. When I went on your site to look at the "instructions" in the link you have. I got this message: "The instructions you requested are not currently available from the manufacturer. We apologize for any inconvenience" I got only ONE light wired with some head scratching and soldering. Hopefully you'll do better next time. Everything you've sent me to date has been excellent. But... :( 576139

The lamps install using the spring terminals on the rear of the lamp. Simply the stripped wires into the square holes, as mentioned in the video linked above.
-- Mike L - 10/23/2018



The product, ST2RB trailer taillight, works as advertised; which is good. I backed into a tree that jumped in my way while turning around on our farm. Since the trailer has to be inspected to register, I have to repair the taillight. After searching the Internet for a replacement, I found etrailer had the correct part and I was fortunate they also have great service. I recommend this part AND this company for great customer service and rapid response to get me the product quickly. Thank you etrailer. 473830

The product, ST2RB, trailer tail light is still going strong. Happy I worked with etrailer to replace my broken tail light. The light is on a 20’ trailer and I do not use it that much anymore but I can take it on the road if I need too!
Charlie - 02/08/2019



Couldn’t find this where I purchase my trailer, all they had was flat lights....... I’m so glad I found you guys 728627


hard to find this taillite locally your site was very helpful product was just what I needed thank you etrailer 711072


etrailer made the experience of replacing a set of trailer lights smooth and cost effective. Thank you etrailer. I worked in main frame information systems for thirty five years and I must say your user interface is perfect and your product is cost effective. Thanks again. 703785


Good product exactly what I ordered 679684


Just what we needed ... pricing was reasonable only issue was the tracking information was not clears or up to date. But the product itself fit like a gem 669829


Easy to install and delivery was timely. Thank you. 655634


Product was exactly as described and worked perfectly for me. Wiring was super easy 616768


They arrived in good shape ! I installed one the next day ,the other is a spare ! It worked great ! Thank You 570128


Replace a broken light on my trailer. This is the exact match to my others on the trailer! Great quality and superb price! Very happy! 559645


Fine help from customer service. Shop here, good people! 553648


Just what I needed and the shipping was super fast. 548933


Worked perfectly, even included bulbs! 548130

Product is still going strong 1 year later!
Ryan - 07/31/2019



Both as pictured and picture perfect. 546253


Excatly what i wanted 544023


Received in perfect condition. Easily installed/replaced, until the kids break them again taking the trailer out with their Quads. 543668


I needed a replacement tail light for my trailer after accidently breaking it and found just what I needed at etrailer.com. The online purchase was extremely simple and at a fair price. I also appreciated the fact that the shipping cost was also reasonable unlike other companies that seem to up the cost to make an additional profit. 511391


Easy to order this replacement for a broken back light on my trailer. About 5 days from order to receipt of product. 509739


Great product and fast delivery!!! 502694

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • Troubleshooting Function of Additional Trailer Side Marker/Signal Lights
    The problem you're having with your new wiring could be related to the ground, especially since it sounds like you may have added more lights than were originally on the trailer. It often happens that weird behavior from trailer lights results from a loose, corroded or insufficient ground connection. First make sure that each individual light's ground is made to clean bare metal. Some lights like # TLL12RK use a wired ground (white wire with ring terminal) while others like # ST52AA...
    view full answer...
  • Can a Side Marker Trailer light be Wired to Come On with the Blinker
    If you want to make a side marker light blink with the turn signal it will have to be tapped into the turn signal/brake light wire for that side. But then it will also come on with the brake lights. And you would not want to also attach it to the running light circuit because it would back feed and lights would come on when they should not. Trailers are made with what is called a 2 wire system. They have combined turn signals and brake lights and the running light circuit is separate. In...
    view full answer...
  • Can LED Trailer Taillight Kit TLL160RK Replace Incandescent Square Trailer Lights
    Theres no reason you couldn't upgrade your square incandescent lights to the rectangle LED trailer light kit part # TLL160RK that you referenced. LED trailer lights are a great option as they basically last forever and only draw a fraction of amperage when compared to incandescent bulbs.
    view full answer...
  • Trailer Lights Go Out When Headlights Are On
    It sounds like you could have more than one issue on your trailer but the most prevalent is a weak ground or so it seems. I recommend that you start by checking both the trailer side and vehicle side connector, by check I mean you should remove each of them, sand down the surface and then reattach with new mounting hardware. A visual inspection of the ground terminal is not sufficient to check for function. I would also run a jumper wire on the ground circuit from each tail light up to...
    view full answer...
  • Replacement Optronics Side Marker Lens Cover
    The Replacement Side Marker Lens # A2RB will simply need a screw that fits the 1/4" diameter hole and is longer than 1-1/4", so the choice is yours as there is no recommended hardware. Based on the photo you provided, I do recommend replacing the entire # ST2RB fixture because the plastic housing is pretty clearly damaged. Either way I'm sure your friend will appreciate your gesture.
    view full answer...
  • Availability of Replacement Side Marker Lens For Trailer Light PM440
    You might look at Optronics Replacement Side Marker Lens, part # A2RB. This side marker lens is the same length and width as the Peterson Replacement Lens, part # 55-15R, you have referenced, but is 1-1/2 inches tall. The # A2RB lens will fit on a trailer light like the Optronics Square Trailer Tail Light, part # ST2RB.
    view full answer...
  • Replacement Light Bulb For Optronics Square Trailer Tail Light # ST2RB
    The standard light bulbs in the # ST2RB light is part # A1157B. This bulb features 8.3 watts for the tail light function and 26.9 watts for the turn and brake light function.
    view full answer...

Do you have a question about this Trailer Light?

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Info for this part was:

Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Updated by:
Adele M
Updated by:
Laura H
Updated by:
Brian T
Video Edited:
Dustin K
Installed by:
Cole B
Installed by:
Randy B
Video by:
Zach D

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