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Incandescent Tail Light for Trailers over 80" Wide - Submersible - 7 Function - Passenger Side

Incandescent Tail Light for Trailers over 80" Wide - Submersible - 7 Function - Passenger Side

Item # ST56RS
Our Price: $11.95
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Trailer Lights
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Shipping Weight: 0.76 lbs
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Optronics Tail Lights - ST56RS
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6-1/16" x 3-3/4". Waterproof, incandescent light serves 7 functions on trailers over 80" wide: brake, tail, turn, side marker, side reflector, rear clearance, and rear reflector. Stud mount. 3-Wire design. Great Prices for the best trailer lights from Optronics. Incandescent Tail Light for Trailers over 80" Wide - Submersible - 7 Function - Passenger Side part number ST56RS can be ordered online at or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - ST56RS

  • Tail Lights
  • Rectangle
  • Incandescent Light
  • Red
  • 6L x 3-1/2W Inch
  • Surface Mount
  • Stop/Turn/Tail
  • Side Marker
  • Rear Clearance
  • Side Reflector
  • Rear Reflector
  • Submersible Lights
  • Optronics

6-1/16" x 3-3/4". Waterproof, incandescent light serves 7 functions on trailers over 80" wide: brake, tail, turn, side marker, side reflector, rear clearance, and rear reflector. Stud mount. 3-Wire design.


  • Red, rectangular trailer light serves 7 functions for trailers more than 80" wide
    • Stop, turn, tail, rear clearance, rear reflex, side marker, and side reflex
  • Sealed, waterproof housing and lens unit is submersible
  • Incandescent bulbs are easy to replace
  • Shock-proof sockets prtect bulbs against damage
  • Durable plastic housing with snap-on lens
  • Red lens over incandescent bulbs
  • Compatible with 12V DC systems
  • Stud mount to trailer with included studs
  • 3-Wire design hardwires to trailer
  • DOT compliant


  • Configuration: passenger side
    • Driver side: ST57RS (sold separately)
  • Distance between mounting studs (center on center): 2"
  • Bulb type: 1157 and 194
  • Number of bulbs: 2
  • Power draw at 12.8V:
    • Stop/turn: 2.3 amps
    • Tail: 0.9 amps
  • 3-Year warranty

Optronics ST56 Series Trailer Tail Light Dimensions

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 circuit board is sealed, which means that water will not damage the diodes or circuit board.

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.

ST56RS Optronics Incandescent Tail Light for Trailers over 80" Wide - Submersible - 7 Function - Passenger Side - Right Hand

ST-56RS Submersible Over 80" Tail Light - Right Hand Passenger Side

Alternate part number: ST-56RS

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Incandescent Tail Light for Trailers over 80" Wide - Submersible - 7 Function - Passenger Side - ST56RS

Average Customer Rating:  4.7 out of 5 stars   (103 Customer Reviews)

6-1/16" x 3-3/4". Waterproof, incandescent light serves 7 functions on trailers over 80" wide: brake, tail, turn, side marker, side reflector, rear clearance, and rear reflector. Stud mount. 3-Wire design.


Solid product (replacement tail light for boat trailer). Reasonable price. "Pretty good" delivery time (considering [online] has spoiled me). The tracking information was spot on. etrailer even sent a notification email to let me know my package had been delivered. Well done! You're now my go-to source.

After a year of light use no pun intended the tail light continues to working flawlessly. remains my go to resource.
dave - 11/06/2022


I'm a happy guy. This is not my first trailer part order from etrailer, and each order has been serviced and received very promptly.
My trailer entertains many "issues" and obstacles during duck hunting season, and etrailer has kept me operating in very timely fashion. Word.
Michael Donnelly


The tail light fit perfectly.
Still in
great use.
Thank you for all your help great product.


Worked great until the trailer bottomed out and destroyed it. It was a perfect fit for my Karavan trailer, but the light bracket is too low and not protected on the underside, so it is easily damaged. I'd buy 2 in the future if I ever redesign the taillight brackets.


Fit well on utility trailer, just had to splice wiring ends from old light onto it.

After a year its still working fine! It fit like original and looks the same!
Dean Y - 05/16/2022


I finally got around to installing the light. I must say I like how it looks. Its a better fit than the original. A few things to make it better would be higher quality hardware. Stainless would be great. At least include a flat washer. The tiny little nut wasn't a standard size 1/4-20 nut; it was smaller. So the nut and lock washer wanted to slip partially into the hole on the mounting plate. Better hardware would cost only pennies more. Another improvement would be including wire splicers and shrink tubing to make a water proof splice. Attached is a picture of the left side.


The tail light was delivered in short order and in perfect condition. It was an exact fit for the broken one it was replacing. Installation complete in just a few minutes. I then built hard covers so I don't smash the lights with my riding lawn mower again.


It fit perfectly, just what I needed. Speedy shipping.


Plug and play! Quick delivery and excellent pricing!


light was what I orderd and it got to me in 4 days after ordering with no special delivery order.


Perfectly replaced my old one and was simple to install.


just received trailer lights today-shipping was great-packaging was great--product is not what I have experienced from etrailer in the past. These are supposed to be submersible trailer lights but the bottom is open so water will get in and corrode the sockets and the info on the package says that to replace the bulbs to unscrew the lens but there are no screws(the cover only snaps into place). The wiring comes out of the bottom of the light without the usual ability to reroute around the back without pinching the wires. These are not a good choice for a boat trailer

The light casing is designed with holes for moisture and rain to escape. The circuit board is sealed on the inside.
-- Etrailer Expert Heather A - 01/09/2019


Exactly what I needed at a great price.Same product as described.


Unbelievable customer service and super fast delivery of high quality items

Easy to install and still working perfectly. Dont let the price deter you ,they are great for the money.
John - 10/24/2021


The exact product I needed and quick delivery. I can’t ask for anything else.


I just ordered another one as the first one lasted 3 months before breaking. The lens broke away from the bracket. I'll give one another chance but since it is cheap maybe you get what you pay for?


Friendly and prompt


All the parts I ordered were correct and of good quality. The customer service was outstanding!! I spent probably 30 minutes on the phone with Danielle as we tried to figure out exactly what axle was on my trailer ( wasn’t what it was supposed to be ). The parts showed up in a pretty reasonable amount of time considering the pandemic was in full swing. The prices also were very reasonable, as she searched her inventory for the best price, found a package deal for me with more than I was looking for at less cost than buying the parts individually. I will use them again for sure and definitely recommend them to anyone needing trailer parts.


I had trailer light problems (who hasn't?) and found etrailer on the web. The site was extremely well organized and made it easy to find what I was looking for.
I had a question regarding the kind of wire connector needed. It was answered promptly by E-mail.
The lights and connectors arrived as promised and the installation was straightforward thanks to the videos on the site.


This is the second time I have ordered from etrailer. Both times the part come to me quickly, the correspondence letting me know it was on its way was timely. Super friendly service. Highly recommend


Works great. Easy to install


I had to replace one tail light on an old trailer that broke off. Got this one because it matched what was already on it and it works great. Easy to install and was exactly what I needed. Would recommend etrailer to everyone needing trailer parts.


This is a replacement for my 1986 EZ Loader trailer. They sure made it easy to find the correct lights. Shipping was fast with no hassles. I would buy from them again.

Alan P.


eTrailer has an excellent web site, easy to navigate and find exactly what you are looking for. The products are top quality, competitively priced, and ship immediately. I highly recommend eTrailer.


It's an OK product, not the most durable. Rated it a 3 for value versus quality.
I bought it because it matches the other light.
I would look for a better product if outfitting a trailer with a set of new lights.

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Left Hand Side Trailer Light to Match ST56RS
    The left hand version of the part # ST56RS is actually part number # ST57RS. The biggest difference is that this one has a light for the license plate that would be mounted below it. Aside from that it's no different. Only other difference is it has a yellow wire instead of a green wire for the stop/turn signal.
    view full answer...
  • Passenger Side Version of Optronics Taillight # ST57RS
    The passenger side version of the Optronics light part # ST57RS is the part # ST56RS.
    view full answer...
  • Recommended Replacement Tail Light Assembly for 6 inch x 3 inch Tail Lights
    It sounds like you're looking for a set of submersible tail lights, and which ones you'll want to use depends on the other type of lights you currently have on your trailer-i.e. LED or incandescent. If you've got incandescent lights already on your trailer you can use something like the Optronics # ST56RS (passenger side) and # ST57RS (driver's side) and are 6" long by 3-1/2" tall. If you've got LED lights on your trailer the LED Combination Tail Light Kit for Trailers under 80" Wide...
    view full answer...
  • Recommendations for Waterproof Tail Lights for a Boat Trailer
    Optronics tail lights # ST56RS and # ST57RS are submersible assemblies. This means that water can drain out of them. What I recommend are sealed lights such as # STL57RB and # STL56RB so water cannot get in at all. Sealed lights will have far less issues than regular submersible lights.
    view full answer...
  • Is Right Hand Version of Submersible Trailer Tail Light ST57RB Available
    We do offer the right hand version of the # ST57RB light. Part # ST56RS would feature the same functions as the left tail light, but does not include a license plate illuminator. I would recommend using some electrical tape and some dielectric grease, part # 11755, to make the installation as clean and secure as possible.
    view full answer...
  • Does The Optronics Tail Light ST57RS Come With Plugs On The Ends Of The Wires?
    The Optronics Incandescent Tail Light for Trailers over 80" Wide - Submersible - 8 Function - Driver Side # ST57RS will have bare wires for the connection to a trailer and ground wire with a ring terminal, but will not have a 2 prong plug. However, if you were going to be replacing the passenger side as well ( # ST56RS), you could also get the Hopkins 2-Pole Flat # HM47965, cut it in half, and then splice it into the wires on the lights. This would give you the 2 prong connection for quick...
    view full answer...
  • Recommended Replacement Tail Light for Boat Trailer
    The Optronics ONE Series Marine LED # STL0016RB you asked about is 8 x 2-7/8 by 2-13/16 inches. I've attached a diagram to assist. The closest tail lights to your 3-3/8x5-7/8 measurements on your boat trailer are the STL57RB for the driver's side and STL56RB for the passenger side. These LED submersible lights are 6-1/16 x 3-5/8 so just slightly larger. For incandescent lights, I recommend the Optronics 6-Function Tail Light - Submersible - Passenger Side # ST56RS and driver's side...
    view full answer...
    Image 1 for Image 2 for
  • Submersible/ Boat Trailer Incandescent Light Recommendation
    The Optronics Trailer Tail Light # ST31RB is considered to be a weatherproof light, which means it can withstand the occasional rain shower, and according to my contact at Optronics, it is in fact submersible. That being said, I took a look at the light and wasn't able to really notice any type of seal surrounding the bulb, so I believe we have far better options for you. If your boat trailer is less than 80 inches wide, a similarly priced gasket sealed and waterproof incandescent light...
    view full answer...

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Info for this part was:

Employee Tricia G
Updated by:
Tricia G
Employee Brian T
Updated by:
Brian T
Employee Jameson C
Expert Research:
Jameson C

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