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Optronics Combination Trailer Tail Light - Submersible - 7 Function - Incandescent - Passenger Side
Optronics

Optronics Combination Trailer Tail Light - Submersible - 7 Function - Incandescent - Passenger Side

Part Number: ST16RB
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$16.94
Retail:$43.22
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8-1/16" x 2-7/8" Rectangle. Waterproof incandescent light acts as brake, tail, turn, side marker, side reflector, rear clearance, and rear reflector for trailers over 80" wide. Stud mount - includes hardware. Great Prices for the best trailer lights from Optronics. Optronics Combination Trailer Tail Light - Submersible - 7 Function - Incandescent - Passenger Side part number ST16RB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Optronics Trailer Lights - ST16RB

Highlights

  • One Light, 7 Functions: Acts as stop, tail, turn, side marker, side reflector, rear clearance, and rear reflector.
  • Reliable In Any Weather: Sealed, waterproof housing is fully submersible to prevent water damage.
  • Quick Replacement Fit: Exact match for Wesbar #3554 and Peterson #M456—no rewiring needed.
  • Built-In Reflector: Eliminates need for separate reflector to meet lighting requirements.
  • Simple Mounting: 2" stud spacing with included bolts and lock nuts for secure install.
  • Easy Bulb Changes: Uses replaceable 2057 bulbs; twist-to-remove design saves time.

Features to know about

Brighter and Safer Towing: 7-Function Incandescent Tail Light

One light handles it all. This Optronics combination tail light covers seven functions—stop, tail, turn, side marker, side reflector, rear clearance, and rear reflector—so you stay visible and compliant. It’s built for trailers over 80" wide and uses a 2057 incandescent bulb that’s easy to replace when needed. At 12.8V, it draws 2.3 amps on stop/turn and 0.9 amps on tail, giving you bright performance that’s simple and reliable.

Flatbed utility trailer over 80 inches wide with red combination tail lights installed at rear corners for clearance lighting compliance

Keeping Water Out: Fully Sealed and Submersible

Don’t let water ruin your wiring or bulbs. The circuit board of this rectangular 8-1/16" x 2-7/8" light is sealed inside the housing, making it waterproof and submersible. That means it holds up when launching at the ramp or towing through rain without letting moisture corrode the socket or blow a fuse.

A Fit That Just Works: Stud Mount with Included Hardware

Mounting is straightforward thanks to two integrated studs spaced 2" apart (center to center). The hardware is included, so you can bolt it up securely without hunting for the right bolts or nuts. The durable plastic housing with a red acrylic lens keeps everything solid once mounted.

Wiring Without Guesswork: Pre-Wired Power and Ground

You don’t have to figure out which wire does what. The pre-wired design includes clearly identified leads—white for ground, green for right turn and brake, and brown for running lights. This setup makes connecting simple even when trailer wiring colors vary.

Built Tough for Everyday Use: Shockproof Socket and Long Bulb Life

Frequent bumps and vibrations won’t shake this light apart. Its shockproof socket helps extend bulb life by absorbing jolts instead of transferring them straight to the filament. That means less downtime replacing bulbs and more dependable lighting every time you tow.

Specs

Configuration

  • Passenger side
  • Driver side: ST17RB (sold separately)

Dimensions

  • Overall dimensions: 8-1/16" long x 2-7/8" tall x 2-13/16" deep
  • Distance between mounting studs (center on center): 2"

Technical dimension diagram of Optronics ST16RB submersible trailer tail light showing rectangular shape, red lens, and mounting stud spacing

Electrical Specifications

  • Bulb type: 2057
  • Power draw at 12.8V: Stop/turn: 2.3 amps; Tail: 0.9 amps
  • Compatible system voltage: 12V DC systems

Warranty

  • 3-Year warranty

Manufacturer Cross Reference

  • Wesbar #: 3554
  • Peterson #: M456

ST16RB Optronics Combination Trailer Tail Light - Submersible - 7 Function - Incandescent - Passenger Side - Right Hand

Alternate part number: ST-16RB





Customer Satisfaction Score:

Ratings & Reviews

4.8

1292 reviews
Review sort icon
8-1/16" x 2-7/8" Rectangle. Waterproof incandescent light acts as brake, tail, turn, side marker, side reflector, rear clearance, and rear reflector for trailers over 80" wide. Stud mount - includes hardware.

by:

Wow this is the most amazing company I have ever dealt with on line. I ordered 2 tail light fixtures for my boat trailer and I needed them quickly so I paid the 2 day shipping fee and I didn't receive them for like 6 days. So I told them I thought I should get a refund on the freight, oh and bye the way the fixtures were perfect and exactaly what I had ordered. This sweet lady said she would refund me the difference between regular shipping and my 2 day shipping and she did. As it ended up I got them soon enough that I got the trailer ready to roll when I was supposed too afterall. So will tell everyone I know to shop etrailer for any thing they need if they like being treated great. THANKS AGAIN ETRAILER



by:

Last year I had a teenager learning how to back up with a trailer. This is how I came to need one replacement light. etrailer had a matching replacement light at a good price, and it arrived quickly and well packaged. That light is now starting its second season and is working well. I appreciated the wealth of information that is available on the website, and I found those resources very helpful. This year I have another teenager who needs to learn about trailers, so when the inevitable happens, I'll be back to etrailer!



by:

Works like its supposed to



by:

Excellent communication! Plenty of information on their products.



by:

Tail lights came quickly and are working great. They were exactly the same as the originals. Thank you etrailer!

Roger T. profile picture

Roger T.

7/5/2018

Trailer lights still working well. Like them a lot just what I needed. Thank you.



by:

The first tail light I received was broken in shipping, which does not reflect on the quality of the unit.

etrailer.com sent a replacement promptly, so I was pleased about that.

One problem I had was the mounting slot spacing is 1/4" different from the original lights I had, even though they both use the same lenses. I guess there is no industry standard for mounting holes on these. I had to re-drill the mounting holes in my bracket to make them fit.



by:

So far so good. Easy to install.



by:

Fast shipping, part arrived as predicted. The lights fit the application perfect. Great ordering experience, customer rep was very friendly and helpful. Definatly reccomend order from etrailer. *



by:

Exactly replaced my OEM light that I br oke



by:

Product a new right boat trailer light. Website easy to use, and ordering was easy. Received an email when it was shipped. My new trailer light arrived on time. Exact replacement for broken right taillight. Thanks, etrailer for your great service. Definitely order again

Brent profile picture

Brent

7/29/2020

Consistent Quality Excellent Service life.



by:

I find etrailer to have the trailer parts that are sometimes difficult to locate. Good product descriptions, with details and pictures ensure you are getting exactly what you need. Good prices, quick shipping and excellent customer service makes me always check etrailer first when I require parts for my boat trailer. I have bought several items from etrailer and have always been completely satisfied.

Stan R. profile picture

Stan R.

6/10/2016

No problems whatsoever...good as new. Keep selling quality products.



by:

Finally got my order for the tail light working with Steph. There had been some sort of ordering mix up at the time of paying thru P ay Pal. I thought that the order was just VERY slow, Steph tracked it down, and the order was never finalized - ?? She then helped me reorder - paid $2.99 for lowest shipping on 6/20, got the tail light on 6/25 (in northern Illinois) - wonder how fast the expensive delivery would have been!! Thanks the Steph for all her help!!! By the way, the light looks perfect, just like the original on the trailer from the dealer.

Curt R. profile picture

Curt R.

6/28/2020

Great - fit perfectly - still works



by:

I was looking for a replacement taillight/brake light for my boat trailer. When I clicked on etrailer.com I was impressed with the site and with all of the products and information offered. It was easy to navigate their site and the product info was great. My taillight/ brake light works great and was an exact fit. Very pleased with the whole experience and will order from them again.

John W. profile picture

John W.

3/12/2018

So far so good.



by:

Excellent service…delivered on time…good price for a quality product…fit perfectly…no complaints only kudos for making life easy



by:

Spot on, great item great price!



by:

Product was just as described. Easy to install. Price was less than other vendors.



by:

I had to replace my boat trailer lights on my 1995 Sea Ray boat trailer. These were the perfect replacement lights for the matching of the existing ones. The mounting holes lined up perfect, no drilling required, just remove the old and install the new.
It took more time to connect the wires on each side than to mount the new lights.
etrailer had these to me in three days, and there were exactly as described and many choices to pick from. I don't use the boat all that much, If it were newer and I used the boat more I would have went with the LED model. Again and as usual etrailer was top shelf on the shipping and the price!! Thanks folks, I'll be back again.



by:

Perfect fit. etrailer keeps my 18 year old boat going. I need to stop backing into the dock at the ramp. The next time I break one of these, I'm ordering 1/2 dozen so that I can save on shipping. Not etrailer's fault. It's mine.



by:

Thank you for the quick shipping. My trailer lights arrived sooner than expected. I also appreciate that you had described these as "Direct replacements" for my old lights and referenced their old part#.



by:

An exact replacement for my Tennessee boat trailer.



by:

Taillight is still working great.

Kenneth profile picture

Kenneth

3/12/2026

After a year of use, going to the lake numerous times, the taillight is still functional as the day I installed it. This product gets submerged several times a year and has yet to fail me.

Chris R. profile picture
Etrailer Expert

Chris R.

3/12/2026

@Kenneth That's awesome to hear! What lakes are we hitting up next?


by:

Exact replacement needed for broken lig ht



by:

The customer service is superior. I was contacted right away to let me know my order was out of stock and would be delayed. An alternative product was provide at that time. I declined the alternative and still received my original order ahead of project delivery date.



by:

Exact replacement for my boat trailer tail light.



by:

Bought as a replacement tail light for a boat trailer. Fitment and install were fine. It lasted less than one year. Light went out partway through the season. Open the housing to find that water got in and corroded the whole assembly.


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See what our Experts say about this Optronics Trailer Lights

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    We have exactly what you are looking for. The replacement light we offer that will work for you is part # ST16RB. This is listed as an exact replacement for the Wesbar 3554 light on your trailer, which is the passenger side of the trailer. if the light you need is for the driver side of the trailer and has the license plate light then the light you need is part # ST17RB.
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