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Incandescent Tail Light for Trailers over 80" Wide - Submersible - 8 Function - Driver Side

Incandescent Tail Light for Trailers over 80" Wide - Submersible - 8 Function - Driver Side

Item # ST57RS
Our Price: $11.74
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Shipping Weight: 0.77 lbs
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6-1/16" x 3-3/4". Waterproof, incandescent light serves 8 functions on trailers over 80" wide: brake, tail, turn, side marker, side reflector, rear clearance, rear reflector, and license plate light. Stud mount. 3-Wire design. Great Prices for the best trailer lights from Optronics. Incandescent Tail Light for Trailers over 80" Wide - Submersible - 8 Function - Driver Side part number ST57RS can be ordered online at or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - ST57RS

  • Tail Lights
  • Rectangle
  • Incandescent Light
  • Red
  • 6-1/16L x 3-3/4W Inch
  • Surface Mount
  • License Plate
  • Rear Clearance
  • Rear Reflector
  • Side Marker
  • Side Reflector
  • Stop/Turn/Tail
  • Submersible Lights
  • Optronics

6-1/16" x 3-3/4". Waterproof, incandescent light serves 8 functions on trailers over 80" wide: brake, tail, turn, side marker, side reflector, rear clearance, rear reflector, and license plate light. Stud mount. 3-Wire design.


  • Red, rectangular trailer light serves 8 functions for trailers more than 80" wide
    • Stop, Turn, Tail, Rear Clearance, Rear Reflex, Side Marker, Side Reflex
    • Built-in license plate light illuminates trailer license plate
  • Sealed, waterproof housing and lens unit is submersible
  • Incandescent bulbs are easy to replace
  • Shock-proof sockets protect 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: driver side
    • Passenger sider: ST56RS (sold separately)
  • Dimensions: 6-1/16" long x 3-3/4" tall x 2-1/4" thick
  • 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

Manufacturer Cross Reference
Light will work as an exact replacement for:
Wesbar # 3025

Optronics ST57 Series Combination 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.

ST57RS Optronics Incandescent Tail Light for Marine Trailers over 80" Wide - Submersible - 8 Function - Rectangle - Driver Side - Left Hand

Alternate part number: ST-57RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Incandescent Tail Light for Trailers over 80" Wide - Submersible - 8 Function - Driver Side - ST57RS

Average Customer Rating:  4.8 out of 5 stars   (125 Customer Reviews)

6-1/16" x 3-3/4". Waterproof, incandescent light serves 8 functions on trailers over 80" wide: brake, tail, turn, side marker, side reflector, rear clearance, rear reflector, and license plate light. Stud mount. 3-Wire design.


Etrailer accidentlly sent me an LED light assembly instead of what I bought
which was the equivalent incandescent assembly. I needed the incandescent
version in order to share parts with an existing light that had partially
broken. I called their technical support. They understood the problem very
quickly. They then quickly sent me the incandescent version. So although
they made a mistake, they recovered very quickly and professionally. I was
pleased and impressed.


Great product! Customer service is number one!! I will definitely purchase all my needed products from E Trailer....


We are very satisfied with our trailer light. Great job etrailer!


perfect replacement for me...Exact light as was broken..THANKS


Perfect fit for an old 1999 boat trailer. Worth waiting for


Great light hooked up easily over the license plate worked like a charm


I just installed it on my trailer. Don't know if it works yet as I still have to test it. It looks like it is built good. It bolted right on without having to make alterations..


Received two days after I ordered it and two days early! My tail light was exactly as described, easy to install, and works perfectly. This was a perfect transaction. I will be back for my future needs. Thank you very much.


Second time I bought one of these lights. Both times the lens was gone when I got to my destination on the first tow. Granted it was on a dirt road but have towed many trailers on it over the years with no problems. Going to look for a better quality this time.

Etrailer Expert

Jenny N.


I reached out to the manufacturer and it is not common for the lenses to go missing however the lights to do have a three year warranty. We also carry replacement lenses, part # ST56RS.


Will buy from these guys again.


Great product. Better fit and look than OEM tail light it replaced.


replaced tail light on my sea lander boat trailer , fit good and works well.


the product was a replacement for a broken one on a trailer and i wanted matching replacement. I was very impressed by the price and speed of the arrival of product from etrailer. I checked other vendors on line and found etrailer to be the cheapest and reasonable for product and shipping . I will definetly return and recommend etrailer. thank you

Joseph L.




Never disappointed when ordering from
Exactly what was needed



Still going strong


This light fit just like the reginal and very easy to install.


Perfect fit to replace a broken tail light on jet ski trailer.


The rack is very well built and it holds both of my ebikes. It was easy to build and the rack is easy to load. The seller’s employee was was very friendly, very knowledgeable and great to order from.
Thanks for a great rack!

Jeff H.


A year later the rack is still great and doing everything it’s supposed to. We ride a lot and see many bike racks on SUV’s and none of them come close to out performing this rack. Again thanks for a great rack!


Product as described and received timel y!


Received order sooner than expected.


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.


Excellent light, and a good value.



These lights work great after a year. Very reliable product.


Easy to shop and find the exact fit, quick delivery!
My second purchase here and both were good.


Easy to install and just what I needed


Used this light to replace one I cracked on my Lowe trailer driving over a pipe. Other than some minor wire connection modifications, it fits and works like new. My trailer has plug-in lights, so I used waterproof butt connectors to join the old plugs to the new lights.


Excellent service

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Replacement Submersible Tail Lights Needed for Shorelander Boat Trailer
    Whether it be lights or lenses, to order replacements for your Shorelander boat trailer, you can either try and locate a part number on the light housing (not the lens) or take a quick measurement of the light and order by size. I have included a link to our submersible tail lights for you. From this link you can use the filters to narrow down your search. Unfortunately a collective OEM trailer parts catalog does not exist, so the best way to determine what parts you will need is to obtain...
    view full answer...
  • Removing Existing Trailer Taillight
    The procedure from removing your existing lamps will depend on the lamp itself. If your current lamp is part # ST57RS, there are bolts on the rear of the lamp that pass through the mounting bracket on the trailer. Once these bolts are loosened, the lamp will pull away from the trailer frame. If you have a different lamp, send me a photo by replying to this email.
    view full answer...
  • Can the Lens for the Incandescent Tail Light ST57RS Be Replaced
    The replacement lens for the Incandescent Tail Light part # ST57RS is not available therefore your only option is to replace the entire light assembly.
    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...
  • 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...
  • Replacement Wesbar Taillight For Shorelander Trailer
    I did a Google search on the 5110310 part number you provided, and couldn't find any reference to it. Perhaps this was Shorelander's internal part number for the lamp? If you click the provided link, you can see the Wesbar taillights we offer. I do know that the # 403025 was commonly used by Shorelander. Given the measurements you provided, # 403025 is the likely replacement. If you'd care to reply with a photo of the remaining passenger side lamp, I'd be happy to look into it further for you.
    view full answer...
  • Replacement Lens Needed for Shorelander Boat Trailer Tail Light
    To order replacement lens for your Shorelander boat trailer, you will want to try and locate a part number on the light housing or take a quick measurement of the light and order by size. I have included a link to all of our tail light replacement lenses for you. From this link you can use the filters to narrow down your search. We do know that Wesbar Submersible Trailer Tail Lights, # 403025 (left side) and # 403075 (right side) were commonly used by Shorelander but unfortunately a collective...
    view full answer...
  • Trailer Right Turn Signal Does Not Work and Left Signal Comes On Instead of Right
    The first thing you are going to want to do is isolate the issue. Disconnect the trailer from the vehicle and use a circuit tester, # PTW2993 if needed, to test the wiring on the vehicle. If you are using an aftermarket converter on the vehicle first test the wires leading into the converter box. If the signals are not correct, then there is an issue with the vehicle wiring you will need to track down. If the signals are correct going in but not coming out at the connector then that indicates...
    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...
  • 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 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...
  • Replacement Tail Lights Recommendation for a 2005 EZ Loader Boat Trailer
    Thanks for the photo, that really helps to narrow it down! For incandescent replacements you need these Optronics Lights: - Driver Side # ST57RS - Passenger Side # ST56RS Then for LED replacements you need these Optronics Lights: - Driver Side # STL57RB - Passenger Side # STL56RB
    view full answer...
    Image 1 for
  • Replacement Submersible Tail Lights for a Shorelander Boat Trailer
    First, the additional function is a license plate light. If your license plate is mounted and/or illuminated elsewhere then you could use 2 right side lights. When replacing trailer lights it is best to go with all LEDs or all incandescents. Mixing the types can result in lights not working or overdraw on the LEDs. Otherwise you can use either one. The dimensions, 6-1/16 inches long x 3-5/8 inches wide x 2-1/4 inches deep, for # STL56RB are correct. Rear reflex means that the lens also...
    view full answer...
  • Replacement License Plate Holder and Light for Shorelander Trailer
    Often the license plate holder has an integrated light that requires replacing the entire holder as well. I recommend the LED Trailer License-Plate Light w/ Mounting Bracket - 2 Wire - 5 Diodes - Clear # LPL56CB because there are no bulbs to replace and there is a lifetime warranty on the LEDs. You will need to cut the wires and reconnect the new ones. If you have something more detailed, send me a photo and we can continue to troubleshoot.
    view full answer...
  • Availability of Submersible LED Lighting for 2000 Shorelandr Classic Boat Trailer
    You can see all of our submersible LED type lighting products on the linked page. You can also refer to the linked article on trailer lighting requirements to see exactly what lighting is needed for your particular trailer. For taillights, click on that category at the top of the page; then select the shape, mounting type and dimensions most closely matching your requirements. We even offer complete LED lighting kits for trailers over 8-inches wide, part # TLL36RK from Optronics.
    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...
  • Troubleshooting Curt Wiring Harness 56320 on 2019 Ford Escape with LED Turn Signal Blinking Quickly
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56320 has not as of 05/2019 been confirmed to fit your vehicle. It is very possible that the LED lights are the issue, but because we don't have a confirmed fit wiring harness I can't give you a confirmed answer. If it were me, I'd first check the ground connection on the trailer near the tongue and then at the tail lights which is normally though the mounting hardware if there isn't a separate wire. Make...
    view full answer...
    Image 1 for
  • Boat Trailer Lights, Breakaway Cable, And Trailer Bearing Replacement Recommendations
    The Aero Pro LED Trailer Light Kit for Trailers Over 80" Wide # TLL36RK is a solution for your Shorelandr SR-V1831 boat trailer with fully sealed, waterproof construction that is fully submersible. The dimensions of combination tail lights (STL36RB and STL37RB) are 7-7/8" long x 3-1/4" wide x 2-7/8" deep. The dimensions of the clearance and side marker lights (MCL91AK) are 2-1/2" long x 1-1/4" wide x 7/8" deep and the dimensions with bracket are 2-7/8" long x 1-1/2" wide x 1-1/4" deep...
    view full answer...
    Image 1 for
  • Availability of Truck Lite Model 15 Light Base Replacement
    I looked up the Truck-Lite 15 light and found that it's basically the same as the Optronics Mini Thin Line clearance lights like the part # AL91AB. Which we have a black base part # A91BOB and a chrome base part # A91OB for but we do not have a white one.
    view full answer...

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Info for this part was:

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