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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
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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. Lowest 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 etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (39)
  • Q & A (5)
  • Videos (1)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - ST56RS

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

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

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

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Optronics Trailer Lights - Tail Lights - ST56RS Review

Today we're going to be reviewing part number ST56RS. This is the Optronics 6 Function Tail Light. It is submersible. It's designed for trailers over eighty inches in width. This is going to be for the passenger, or right hand side, of your trailer. The six function; stop, turn, tail, rear reflect, side marker, and side reflect tail light is all included in this unit.

It's waterproof and corrosion resistant. It's going to feature a replaceable snap-on lens as well as two incandescent bulbs. The incandescent bulbs are going to sit in a shock proof socket so it's going to guarantee a long bulb life. You're going to have your side marker bulb and then your main bulb for your tail light. The replacement bulb for the side marker is going to be number 194.

The replacement bulb for the tail light is number 2057. It's a universal mount. You can see right here it's got the two slots. If we take a measurement, center on center, the distance between the two slots it's going to measure right on two inches. Mounting hardware is included. The wiring is going to contain three wires for your ground and lead wires.

The white wire's going to be your ground, brown wire is going to be for the tail lights, and then your green wire's going to be for your stop and turn signals. This light is SAE, Department of Transportation, FMVSS, and CMVSS compliant. If we take a look at the overall measurements it's going to give us an overall length of six and one-sixteenth of an inch, an overall width of three and three quarter, and then the depth is going to measure about two and one quarter of an inch. We're going to go and hook this up to our external power source that way you can see what it looks like with power running to it. We'll also be able to turn off our overhead lights that way you can see it in a low light setting. This is going to be the tail light function.

It's sending out a nice, consistent signal. Again, you have the side marker clearance light over here. You can see that little bulb burning in there. Again, tail light function and then when we apply our brakes it's going to illuminate sending out a nice, strong, consistent signal. It's also going to function as our turn signal. In the lens it's also going to feature a built-in reflex reflector material down here that runs along the bottom of the light. That's going to do it for today's review of part number ST56RS. This is the Optronics 6 Function Tail Light for the passenger side, or right hand side, of your trailer. .

Customer Reviews

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

Average Customer Rating:  4.6 out of 5 stars   (39 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.

- ST56RS

Excellent product, fit perfectly on my trailer. The driver's side came dented, called etrailer and they immediately sent a replacement at no cost for me. Best customer service ever! 641694

- ST56RS

Worked as expected, easy to install screws were hard to get seated. Slots were a bit to small for the screw heads. 543292

- ST56RS

Product was easy to install and fit perfectly on my Shoreland'r trailer. I am quite pleased with the results. 420347

- ST56RS

Everything is very good lots of help finding the correct light can’t go wrong 706902

- ST56RS

Open the box to discover the sealed packaging had been previously opened. Part seems undamaged. I hope it is not defective once installed. 502990

- ST56RS

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 596190

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


- ST56RS

Easy to install and refresh the lighting on my 10 year old trailer. 522573

- ST56RS

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. 540778

- ST56RS

Hard to find lights. Fit like originals. Still going. 744562

- ST56RS

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! 740254

- ST56RS

Great price,fast shipping,quality produ ct. 727447

- ST56RS

Product was just what I was looking for. So easy to find on the website. Fast delivery. Thanks. 710880

- ST56RS

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. 699611

- ST56RS

Product fit perfectly. Just as described. Price was great. Will defiantly recommend. 666674

- ST56RS

Lights were exactly the same as on my previous trailer. I could not find a kit with matching sized lights, so had to piece a kit together with these lights. Good product so far, quick shipping. 617326

- ST56RS

Received my lights earlier that expected. Fairly priced and of good quality. Thanks 611474

- ST56RS

perfect fit fast delivery very happy 583179

- ST56RS

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. 578019

- ST56RS

Very happy with the service. Used them a couple times and I would use them again. 555120

- ST56RS

Great customer service, knowledgeable and courteous, great price and fast delivery. 548809

- ST56RS

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. 453825

- ST56RS

Trailer lights work as described. Quick delivery. 420281

- ST56RS

product was exactly what I needed and ordered order page was very easy and straight forward insuring got the item I was looking for info on shipping was emailed to me and the item was even delivered BEFORE the estimated time kudos to this company 373490

- ST56RS

F A S T service! I received just what I ordered and the price was unbeatable. Great job etrailer. 365745

- ST56RS

The product was exactly what I needed at a great price and the delivery was incredibly prompt. The customer service excellent and it's great to be able to talk to some one on the phone when you need to. I will definitely be back. Great company. 355015

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Info for this part was:

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

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