bing tracking image
  1. Trailer Lights
  2. Optronics
  3. Tail Lights
  4. Square
  5. Incandescent Light
  6. Red
Combination Trailer Tail Light - 7 Function - Incandescent - Square - Red Lens - Driver Side

Combination Trailer Tail Light - 7 Function - Incandescent - Square - Red Lens - Driver Side

Item # ST9RB
Our Price: $12.39
You Save: 55%
Trailer Lights
Shipping Weight: 0.46 lbs
Add to cart
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
5-3/16" x 4-9/16". Incandescent trailer tail light serves 7 functions: stop, turn, tail, rear reflex, side marker, side reflex, and license light. Shock-proof sockets protect bulbs. Stud mount on trailer. Quick connect wiring. 2 bulbs. Great Prices for the best trailer lights from Optronics. Combination Trailer Tail Light - 7 Function - Incandescent - Square - Red Lens - Driver Side part number ST9RB can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (1278)
  • Q & A (0)
  • Photos

Optronics Trailer Lights - ST9RB

  • Tail Lights
  • Square
  • Incandescent Light
  • Red
  • 5-3/16L x 4-9/16W Inch
  • Surface Mount
  • License Plate
  • Rear Reflector
  • Side Marker
  • Side Reflector
  • Stop/Turn/Tail
  • Non-Submersible Lights
  • Optronics

5-3/16" x 4-9/16". Incandescent trailer tail light serves 7 functions: stop, turn, tail, rear reflex, side marker, side reflex, and license light. Shock-proof sockets protect bulbs. Stud mount on trailer. Quick connect wiring. 2 bulbs.


  • Square incandescent trailer light serves 7 functions for trailers less than 80" wide
    • Stop, Turn, Tail, Rear Reflex, Side Marker, Side Reflex and License Plate Illuminator
  • Built-in reflector removes the need for a separate reflector
  • Shock-proof sockets protect bulb against damage
  • Incandescent bulbs are easy to replace
  • Durable plastic housing with screw-on lens
  • Red lens over incandescent bulbs
  • Compatible with 12V DC systems
  • Stud mounts to trailer - hardware included
  • Quick connect wiring: simply insert stripped wire into holes for a secure connection
    • Light grounds through mounting studs
  • DOT compliant


  • Configuration: driver side
    • Passenger side: ST8RB (sold separately)
  • Dimensions: 5-3/16" long x 4-9/16" tall x 2-7/8" thick
  • Distance between mounting studs (center on center): 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 # TL4400L

Wesbar # 3010

Grote # 52312

Peterson # M440L

Optronics ST9RB Series Universal Combination Tail Light Dimensions

ST9RB Optronics Tail Light for Trailers Under 80" Wide - 7 Function - Incandescent - Square - Red Lens - Driver Side - Left Hand

Alternate part number: ST-9RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Combination Trailer Tail Light - 7 Function - Incandescent - Square - Red Lens - Driver Side - ST9RB

Average Customer Rating:  4.8 out of 5 stars   (1278 Customer Reviews)

5-3/16" x 4-9/16". Incandescent trailer tail light serves 7 functions: stop, turn, tail, rear reflex, side marker, side reflex, and license light. Shock-proof sockets protect bulbs. Stud mount on trailer. Quick connect wiring. 2 bulbs.


The Igor worked great. I had a heck of a time trying to order lights for the trailer - either not getting the ones I intended getting or mismatched lights. But you came through like me a champ. Thanks.



They are still on and I assume they are still working. Parked the trailer in storage after I put the lights on and have only been out to put the new license plate sticker on.


This one is for the “driver” side. It has the lens on the bottom for lighting the license plate. (It does not include the license plate holder. I like this one because you just push in the wires. I recommend this light.



No worries


Great Product, it's good quality and will fit perfectly for the trailer I use in my Air Conditioning, Heating & Refrigeration Business. The only problem is I ordered the wrong side. Wasn't sure if by the which one was the left or the right? I was looking at the trailer form the front when I determined it was the left one but it appears your suppose to look at the back of the trailer when you do that. Guess I will be ordering the otherside here shortly. Maybe I can get an exchange or if not then I will have a spare and hope if it does get broken again it's the other side. Etrailer has some really good quality stuff at a very good price. I got my hidden hitch from them at a Great Price. They even had a video that showed me how to install it. A couple of the local places here wanted 3 times the amount of what I paid to provide the hitch and install it for me. Will never go anywhere else for any trailer parts or accessories.


Part was delivered quickly and was as ordered.

Great job!


We purchased a replacement combo tail light. It arrived on time, in good condition and was the exact replacement.
Although it does not really show on our trailer, we have attached a picture since the trailer has a unique use. It's a small landscaper's trailer converted to a mobile radio broadcasting studio.


Last project built. Used etrailer for almost all parts, including the taillight. Friend wants one now so started another one. I will be getting all the parts from etrailer...


Just what I ordered and shipped quickly! Thank you!


These are a great replacement light


Just as described. They fit and work perfect - Thank You


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 item I ordered came quickly and was exactly what was ordered and was an exact fit to replace the damaged light on my camper. etrailer filled my order quickly and shipped the item promptly and followed up with tracing information. I wouldn't hesitate to purchase products from them again.


I ordered both the ST9RB and ST8RB. After years of use, my other boat trailer lights were starting to cause me problems. I decided to order new ones for each side. These are a different make, but the connections were the same as were the mounting holes. Just took minutes to mount and both worked great. Nice bright lights again! Good price and fast shipping. I would definitely order again.



Other than changing a bulb, they are still working like new! Money well spent.


Lights were a perfect replacement for existing (busted) trailer lights. These lights did not contain wires, but had well-marked jacks to insert existing wires into. Installed in less than 30 minutes, tested - working great.

Jim B.


After a year, lights still working great. They stay out in elements year-round.

by: had exactly what I needed. I bought a replacement for a broken trailer stop, turn, tail and license plate light for my bar-b-que trailer and it matched the other side perfectly. It was packaged very well. I'll be a repeat customer.

Larry H.


I am still very happy with my light.


Normal etrailer transaction...what I needed, good price, fast delivery


Good product. As advertised. Great pric e.


Great company!
I received my order
promptly, unfortunately the box and contents had been smashed during shipping. After contacting customer service via e-mail, e-trailer arranged for a replacement in no time. I will definitely buy from you again when I'm in the market for trailer parts.

Thanks e-trailer!

Rick H.


After a year of use of our trailer hauling hay, we moved and used our trailer for some of our belongings, 1700 miles in the rain, and all the trailer lighting still works perfectly. Thanks again etrailer.


Great selection and perfect match to the original equipment.


Great replacement


Exactly what I needed to replace broken tail light on my trailer. It was an exact match so was able to salvage some parts from old one ... just in case. As I recall, the price was fair and delivered in good time.

I have no complaints ... only praise.

Would highly recommend.

Bob R.


Last I used the trailer the signal lights were good as new. Should I need quality replacement parts in the future I would not hesitate to place my order with etrailer again.Thanks for making it affordable and easy.


Item arrived quickly and was well packaged. It is an easy install, simply strip the end of your trailer wires and feed them into the appropriately labeled spring contact (Stop / Turn or Tail ) that will automatically seat the wire in place. Removal of wire is done by using something like a toothpick to push on the spring contact thru a small hole below the wire to relieve tension and slip the wire back out. Like some speaker connections. Both lights worked first time.


product was shipped and arrived on time. lights were a match for the ones replaced. oem lights had problem with sockets , bulbs would lose contact.
after a year these have work and held up great. I give etrailer a a+ rateing.
web site, price, service and a good company to use AND I WILL CONUINE TO.
Mr Jewell

Mr C.




Quite happy. Ordered trailer lights. However the supplied wireing was to short end after installation came apart requiering takedown and 're do
If your supplier could add 1 or 2 inches to the wires would make a great difference


They WORK!! After trying to retro-fit some old taillights I had laying around, I bought and installed these on my trailer. I should have my head examined for not starting out with these lights for the solution to my situation.


Great service. I am a diy er. Was refurbishing an old trailer. Never done that before. Rewired but could not get lights to turn on when the car brakes Applied And car lights on. Took me forever to figure it out but FYI...if you have a tilt trailer...the tilting part needs to be connected to the main part with a ground..... :)..... Learned that on this site. Also bought lights here. Great service. Love the videos on specs. Very helpful. Will look and buy here first next time.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

< Previous

Do you have a question about this Trailer Light?

Info for this part was:

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

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 1-800-940-8924