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Optronics Combination Trailer Tail Light - Submersible - 6 Function - Square - Passenger Side

Optronics Combination Trailer Tail Light - Submersible - 6 Function - Square - Passenger Side

Item # ST6RB
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ST6RB - Square Optronics Tail Lights
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5-1/4" x 4-9/16". Waterproof incandescent combination tail light serves 7 functions: stop, turn, tail, rear reflex, side marker, and side reflex. Screw-on lens. Stud mount to trailer. 2-Wire design. (2) 1157 Bulbs. Lowest Prices for the best trailer lights from Optronics. Optronics Combination Trailer Tail Light - Submersible - 6 Function - Square - Passenger Side part number ST6RB can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (97)
  • Q & A (0)
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  • Why etrailer?

Optronics Trailer Lights - ST6RB

  • Tail Lights
  • Square
  • Incandescent Light
  • Red
  • 5L x 5W Inch
  • Surface Mount
  • Stop/Turn/Tail
  • Side Marker
  • Side Reflector
  • Rear Reflector
  • Submersible Lights
  • Optronics

5-1/4" x 4-9/16". Waterproof incandescent combination tail light serves 7 functions: stop, turn, tail, rear reflex, side marker, and side reflex. Screw-on lens. Stud mount to trailer. 2-Wire design. (2) 1157 Bulbs.


  • Square incandescent trailer light serves 6 functions for trailers less than 80" wide
    • Stop, Turn, Tail, Rear Reflex, Side Marker, Side Reflex
  • Sealed, waterproof housing and lens unit is submersible
  • Built-in reflector removes the need for a separate reflector
  • Incandescent bulbs are easy to replace
  • Shockproof socket guarantees long bulb life
  • Stud mounts on trailer with included studs
    • Gasket is included to create weathertight seal
  • Wiring design contains lead wires for power and grounds through mounting studs
  • DOT compliant


  • Configuration: passenger side
    • Driver side: ST7RB (sold separately)
  • Dimensions: 5-1/4" long x 4-9/16" wide x 2-7/8" thick
  • Distance between mounting studs (center on center): 2"
  • Number of bulbs: 2
  • Bulb type: 1157
  • Power draw at 12.8V:
    • Stop/turn: 2.5 amps
    • Tail: 1 amps
  • 3-Year warranty

Manufacturer Cross Reference
Light will work as an exact replacement for:
Uni Bond # TL5441
Wesbar # 3056
Grote # 52642
Peterson # M441

dimensions of light

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.

ST6RB Optronics Incandescent Combination Tail Light for Trailers Under 80" Wide - Submersible - 6 Function - Square - Passenger Side - Right Hand

Alternate part number: ST-6RB

California residents: click here

Customer Reviews

Optronics Combination Trailer Tail Light - Submersible - 6 Function - Square - Passenger Side - ST6RB

Average Customer Rating:  4.8 out of 5 stars   (97 Customer Reviews)

5-1/4" x 4-9/16". Waterproof incandescent combination tail light serves 7 functions: stop, turn, tail, rear reflex, side marker, and side reflex. Screw-on lens. Stud mount to trailer. 2-Wire design. (2) 1157 Bulbs.


These have been great for my boat trailer. Simple to install and effective. No problems at all.


The Trailer Lights arrived yesterday. Easy installation, looks good, happy with the product.


The best service on all my orders. They ship quickly and accurately. Prices are very good and quality is top notch. I always go straight to Etrailer for all of my diverse trailer parts needs. Many thanks to Etrailer. Photos of an old boat trailer in the process of getting new water tight lights.


Fantastic product and easy to install!!


etrailer got me the Optronics ST6RB assembly (which included bulbs) in 3 days for less $ than most of the stores charged for the bulbs alone. So, instead of changing bulbs, I was able to swap out the entire assembly & have new, uncracked lenses also.
Great. Price. Fast Shipping. Thanks etrailer.

One year out these lights are working perfectly after rough treatment moving my household & woodpile down gravel roads.
Patrick R - 07/31/2020


Works great ,no water gets in so no more burnt out bulbs. Would purchase again

Still working with no water getting into fixture
David C - 11/24/2021


Etrailer always seems to have the parts or products I need even, as in this case, the trailer manufacturer doesn’t stock the tail light I need because they are using a newer style LED light on their trailers now. I only needed one tail light and I wasn’t interested at this time in having to rewire my trailer for the LED lights. As usual Etrailer came to the rescue. Ordering from Etrailer is simple and convenient. They ship promptly and Customer Service has always been great! Thanks Etrailer for getting me back on the road and lakes so quickly!


Just what I wanted - original OEM replacement part. Hard to find, but etrailer had it. LOVE the economy shipping option.

Totally pleased with the light....exact match for the one needing replacement, functioning fine.
Alan M - 07/29/2016


All of the products ( trailer lights, wiring and reflectors ) are still functioning perfectly.
Most of all, the service and follow up from eTrailer is thorough and thoughtful


easy to order, a great service, thanks!


The trailer lights were received in good condition. My reason for 4 stars instead of five is one side marker bulb was loose inside the case and in the other light the bulb was installed wrong and had warped the blade contact. Not a big deal to trace and repair but five stars are reserved for excellence.


Everything is working very well.

satisfied with your products and service. In fact, several times over the last couple years, I’ve recommended your site to friends and coworkers looking for trailer, towing, fastening gear. Keep up the good work there at Etrailer.


I haven't tried the submersible aspects of these lights yet, but installation was a breeze, everything worked, and they look good. Especially nice about dealing with were good website, very reasonable shipping charges, excellent communications (several of them), and quick shipping. This is a very good company to do business with. Highly recommended.


Light seems to be of decent quality for the price. Note that the light is not waterproof, but the lens is gasketed. Fixture is open on bottom where wires exit, and when submerged trap water. Seems like an acceptable design, but I haven't dipped it in the Atlantic Ocean yet. Biggest item to note is that there is no separate ground wire, but grounds through the mounting posts. Should work, but haven't tried it yet.


Bought boat trailer lights and light covers. Service is real fast and prices are good.


Great taillight for my Load Rite trailer and the exact part that the trailer came with. The price was good and the standard shipping option was fine for me. I received it in plenty of time. Very good customer service.


I bought a new trailer last year. The lights corroded and failed same year(salt water).hopefully these will last longer.


Exact replacement for the junk stock lights on my utility trailer. Easy install--2 butt connectors and it's done!!!


Exactly the same product I needed to replace the original that was damaged.


Exactly what I wanted, at a low price, and very easy to install. Still working great.

Still the bees knees.
Virgil N - 04/19/2021


Ordered water proof tail lights for my boat trailer and am very happy with them. Would order more products from E-Trailer.


Product was great. Easily replaced a 25 year old light. But even better was the customer service. I was sent two left lights by mistake. When called to their attention they sent out a replacement light immediately and told me to just keep the extra left light. I did not have to deal with packaging it up and sending it back. Now that's great customer service!


Trailer light was perfect. Easy to install and works fine. Also the price was lower than I expected.


The trailer lights are working well. I found your website online and the product, price and delivery could not have been more favorable. Hope you have a good day.
John B - 09/08/2018


These trailer lights are very well made and inexpensive to boot. They installed very easily and look very good.


Have to check lights every time I hook to the trailer. Bulb connections are not quality, and have to jiggle bulb for good connection

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • Can Submersible Trailer Lights Be Submerged in Saltwater
    Saltwater has a corrosive nature that affects a lot of things, but the Submersible, Trailer Stop, Turn and Tail Light # ST6RB is made almost entirely of plastic so it would not have the same effect. However, our light manufacturers do strongly recommend rinsing the lights with freshwater after being exposed to saltwater.
    view full answer...
  • Diagnosing Possible Ground Problem on Low Boy Trailer Towed by 2000 Chevy Silverado
    Once the headlights are on, are the brake and turn signals on the trailer actually working? I always believe is trying the easy fixes first. Rather than the turn signals and brake lights being obscured by the running lights being too bright, I suspect what is actually going on is a poor ground connection. Your trailer lights work just fine, until the running lights are added to the mix. At this point, the lighting system is drawing full amperage, which is when a ground problem will manifest...
    view full answer...
  • Recommended Boat Trailer Lights For Shorelandr Brand Trailer
    We don't have the exact lights, but we do have similar ones. Without knowing all of the sizes, it is really difficult to make a recommendation. I did find the tail light dimensions, so for those I recommend the Submersible, Trailer Stop, Turn and Tail Light, 6-Function, Right Hand # ST6RB and Submersible, Trailer Stop, Turn, Tail and License Plate Light, 7-Function, Left Hand # ST7RB. For clearance lights, I've linked the page to help. Side marker lights are in this same category....
    view full answer...
  • How Long are the Mounting Studs on Submersible, Trailer Stop, Turn and Tail Light, # ST6RB
    I went out to the warehouse and pulled a # ST6RB trailer light to measure the mounting studs. They are 3/4 inches long, so it does not look like they will work for your application. I also pulled Optronics tail light, # ST57RB. This is a different type of light in terms of the way it mounts. Instead of using studs that are built-in the light, this light has slots that you would slide over bolt heads in the trailer frame. I made a short video for you covering these aspects of the lights.
    view full answer...
  • Replacement Square Trailer Tail Light Without License Plate Light
    We do! The Optronics Combination Trailer Tail Light # ST7RB you were looking at is the driver's side with that license plate light so the equivalent of that is part # ST6RB which is designed for the passenger's side so it doesn't have the license plate light. Attached is a review video for both lights for you to check out.
    view full answer...
  • Are the ST8RB and ST9RB Submersible Lights
    I have a solution for you, but neither the # ST8RB nor # ST9RB are submersible lights. Instead, you'll want to use the # ST6RB and # ST7RB - which are the submersible versions of those lights. These are still incandescent tail lights that look exactly the same, have the same dimensions and are the same 2 wire electrical system, they're just sealed up so that they can be safely used on boat trailers.
    view full answer...
  • Recommendation for Replacement Submersible Trailer Lights that Ground through Mounting Hardware
    For a similar assembly to the Wesbar units you currently have installed on your trailer, I recommend looking at the Optronics Submersible Assembly # ST6RB for the Right Hand and # ST7RB for the Left Hand. These lights measure 5-17/64 inches long, 4-9/16 inches wide and 2-7/8 inches deep. These particular assemblies are designed to be corrosion resistant and includes a gasket that will create a weathertight seal. A shockproof socket will guarantee a long bulb life and the wiring design,...
    view full answer...
  • Troubleshooting Trailer Lights Not Working When Tow Vehicle Headlights Turn On
    Typically when turning on one of the light functions causes the other lights to cut out, it signals an issue with the ground connection on the trailer; the # ST6RB and # ST7RB lights both ground independently with their mounting hardware but there should be a ground wire on the trailer. I would start by checking the ground connection there and also cleaning off the trailer connectors to make sure there isn't any dirt or debris that's causing an issue. The next thing I would check out...
    view full answer...
  • Replacement Side Marker Lens For Optronics Tail Light # ST6RB
    The replacement side marker lens for the Optronics # ST6RB trailer light is part # A9RB. This side marker light measures 2-7/8 inches long x 2-1/16 inches tall.
    view full answer...
  • Replacement Lens for Optronics Trailer Tail Light ST6RB
    Based on your photo it looks like you found the correct red lens # A8RB for your trailer's right-hand Optronics tail light # ST6RB. You can make double sure if you like by comparing the lens dimensions and mounting hole spacing shown the linked photo to your original lens part.
    view full answer...
    Image 1 for Image 2 for
  • Replacement Bulb for Peterson Trailer Taillight Assembly V540
    It looks like you have the Peterson version of the Optronics Lights # ST6RB and # ST7RB. For either of these lights, the correct replacement bulb will be # A1157B. Replacing the bulb is pretty easy actually. Just remove the 4 screws from the lens of the light assembly and the bulb will be right there for you to twist out of its socket.
    view full answer...
  • Replacement Options for a Sealed Trailer Light with a Bad Bulb
    The Peterson 440 series trailer lights typically have 4 screws at each of the corners of the lens that allow you to remove the lens and replace the bulb. It may be possible that you have a sealed version of these lights, in which case the bulb is likely not replaceable without breaking the seal between the lens and the light housing. You will likely be better off replacing the tail lights. For a submersible light with a replaceable bulb and lens that is similar to the Peterson 440 series...
    view full answer...
  • Wire Gauge Use On Optronics Combination Trailer Tail Lights # ST6RB & # ST7RB
    The Optronics Combination Trailer Tail Light Drivers Side # ST7RB and Passenger Side # ST6RB come with 20 gauge wire leads. I recommend using the Deka Heat Shrink Butt Connectors # DW05743-5 to connect the tail lights to your trailer wiring.
    view full answer...
  • What are the Correct Replacement Bulbs for Optronics Trailer Lights # ST6RB and # ST7RB
    It looks like you have Optronics Lights # ST6RB and # ST7RB. For either of these lights, the correct replacement bulb will be # A1157B that you have referenced and # 30-90-194 for the side light. Trailer lights are a 2-wire system. This means that they have combined stop and turn signals on the same bulb. If the lights do not blink with the turn signals, you may need to change the running light wire with the stop/turn signal wires. Use a circuit tester like # 40376 to test the trailer...
    view full answer...
  • Bulb Socket of Optronics ST6RB
    Photo, how about a video? The bulbs are pretty simple to change. Simply remove the 4 screws holding the lens in place, and pull the lens and gasket off of the lamp housing. Push in on the bulb while twisting it clockwise, and the bulb will come right out. I had these same exact lamps on my PWC trailer and they worked great, but recently I swapped them out for the LED version, part # STL8RB and STL9RB which I like a lot better. The LED version of the lamp burns more brightly, while only...
    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 Inexpensive Submersible Trailer Tail Lights
    I can highly recommend the lamps I use on my PWC trailer, # ST6RB and ST7RB. The lamps are submersible, inexpensive and durable. They are also available in an LED version, # STL8RB and STL9RB. The LED versions are obviously quite a bit more expensive, but they are brighter and only use a fraction of the power that a comparable incandescent bulb would. LEDs do not burn out, you will never have to replace a bulb.
    view full answer...
  • Will Optronics Submersible Trailer Light ST6RB Work on Malone Kayak Trailer
    The Submersible Trailer Stop, Turn, and Tail Light # ST6RB that you referenced is a great choice to replace the existing lights on your Malone Kayak Trailer. The light housing is designed to allow water to flow in and back out of the housing while being submerged. This light has 6 functions: stop, turn, tail, rear reflex, side marker, and side reflex, and will mount on studs with 2 inch centers. For the left-hand version of this light you will want # ST7RB. For a similarly sized light...
    view full answer...
  • Trailer Tail Light Protector and Matching Tail Lights
    The light guard # LG440NP is designed to fit Peterson square tail lights # 432200 for the right and # 432400 for the left. A license plate light is still a good idea because you never know where you might tow the trailer! You could also use submersible lights # ST7RB for the left and # ST6RB for the right. And you might be interested in aluminum tread plate light protector # CE26051A. Since it is aluminum it will not corrode like steel.
    view full answer...
  • How to Ground a License Plate Light
    If you have ensured you have power to the light using a test light similar to the LCD Digital Circuit Tester part # PTW2992 then it has to be an issue with the ground. I have always liked making a ground if the original connection doesn't work. You can move it around a little and get contact but eventually it will fail again. Instead use a self tapping screw like Self-Tapping Screw part # FA1131822 and securing the wires to it with 1/4" ring terminal part # DW05702-1. This is going to...
    view full answer...
  • Wire Gauge of 25 Foot Harness Included with Submersible, Under 80 Inch Tail Light Kit
    Optronics uses small 20 gauge wiring for their 4-Way wiring harnesses so it would be even smaller than 18. In order to get 14 gauge wires I recommend # DW04923-1 which is sold by the foot. Each of the wires in it are 14 gauge. Then you would just need the lights, # ST6RB and # ST7RB, 2 of # MC36AB, and license plate bracket # LP10SB. And for the additional clips, connectors, ties and other parts I recommend the wiring kit # HM51020.
    view full answer...

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Info for this part was:

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