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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

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Optronics Stop/Turn/Tail,Side Marker,Rear Clearance,Side Reflector,Rear Reflector,License Plate Trailer Lights - ST57RS
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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. Lowest 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 etrailer.com or call 800-298-1624 for expert service.
  • All Info
  • Reviews (70)
  • Q & A (16)
  • Photos
  • Why etrailer?

Optronics Trailer Lights

  • 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
  • License Plate
  • 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

Item # ST57RS

California residents: click here

Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (70 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.

- ST57RS

Never disappointed when ordering from etrailer.com. Exactly what was needed

- ST57RS

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 C - 09/10/2019

- ST57RS

So far so good. A lot easier to install than other lights.

- ST57RS

etrailer has everything you need for your trailer. Great inventory and fast shipping!

- ST57RS

Easy to install, work perfect!

- ST57RS

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.

- ST57RS

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!

- ST57RS

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

- ST57RS

No problem

- ST57RS

it came on time and fit great. no compl aints

- ST57RS

Product exactly as advertised.

- ST57RS

Installation was easy. Product works fine. I ended up ordering two drivers side lights, but you can wire them so they work on driver side and passenger side.

- ST57RS

Trailer light problems are the bane of anyone (like me) who has a number of toys, all of them on trailers. This time fixing the lights on my Shorelander PWC trailer was fast and trouble free. I replaced the rear drivers side assembly (backed into something) with this item from etrailer. The price was very good, fast shipping and the light fit with no modifications necessary. Oh, and it worked ! Thank you etrailer for a trouble free trailer light fixing experience.

- ST57RS

Great product!! Quick service! My end customer was happy to get his trailer up and running!! Highly recommend this company to everyone!! Thanks!!!

- ST57RS

Quality lights 40% less than available locally. Added a stainless steel flat washer as the base washer beneath the lock washer on installation. Excellent customer service. Thanks etrailer!

- ST57RS

I always shop around for the best product for the price and when it comes to trailer stuff, I always end up with etrailer. AND, I am never disappointed. These guys are great.

- ST57RS

Light fit perfect and works great. Nice and bright and was super easy to mount. Service was great as it came sooner than i expected. Will definitely continue to do business with this company

- ST57RS

Product was exact replacement High Quality.....took forever to receive By mail....But All around E Z trade

- ST57RS

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.

- ST57RS

Good light, fit my trailer perfectly. Specs in ad are right on. I've bought other items from etrailer and I've always been happy with their products and the fast shipping.

- ST57RS

Exact replacement taillight I needed!

- ST57RS

the lamp was exactly what i was looking for as an OEM replacement! Thanks, will use you again in the future.

- ST57RS

Parts arrived in just a few days, fanta stic!

- ST57RS

Unbelievable customer service and super fast delivery of high quality items

- ST57RS

Great product and great price. Arrived quickly and was exactly as described. Will buy here again in the future!

Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • 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
  • 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...
    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...
  • 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...
  • 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...
    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, # 40376 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...
  • 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...
    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...
  • 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...
    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...
  • 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...
  • 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...
  • 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
  • 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...
  • 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...
  • 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...

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