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Optronics Trailer Tail Light - Stop, Turn, Tail - Submersible - Incandescent - Round - Red Lens

Optronics Trailer Tail Light - Stop, Turn, Tail - Submersible - Incandescent - Round - Red Lens

Item # ST45RB
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ST45RB - Recessed Mount Optronics Trailer Lights
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4-1/4" Diameter round. Waterproof trailer light functions as a stop, tail, and turn signal light when properly mounted. Shock-proof socket protects incandescent bulb. Flush mount with grommet (sold separately). Accepts 3-prong plug. Lowest Prices for the best trailer lights from Optronics. Optronics Trailer Tail Light - Stop, Turn, Tail - Submersible - Incandescent - Round - Red Lens part number ST45RB can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (153)
  • Q & A (26)
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  • Why etrailer?

Optronics Trailer Lights - ST45RB

  • Tail Lights
  • Round
  • Incandescent Light
  • Red
  • Recessed Mount
  • 4 Inch Diameter
  • Submersible Lights
  • Optronics
  • Stop/Turn/Tail

4-1/4" Diameter round. Waterproof trailer light functions as a stop, tail, and turn signal light when properly mounted. Shock-proof socket protects incandescent bulb. Flush mount with grommet (sold separately). Accepts 3-prong plug.


Features:

  • Red trailer light serves 3 functions when properly mounted
    • Stop light
    • Tail light
    • Turn signal light
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Shock-proof socket protects the bulb
  • Durable polycarbonate lens and housing
  • Red lens
  • Flush mount with grommet (A45GB - sold separately)
  • Accepts industry standard 3-prong plug (A45PB or A47PB - both sold separately)
  • DOT compliant


Specs:

  • Overall dimensions: 4-1/4" diameter x 2-1/16" thick
  • Power draw at 12.8V:
    • Stop/turn: 2.4 amps
    • Tail: 0.49 amps
  • 3-Year warranty


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

  • Uni Bond # SE4000R
  • Wesbar # 423541
  • Truck Lite # 40282R/40202R
  • Grote # 52922
  • Peterson # 426R
  • Bargman # 40-01-001

Optronics ST45 Series 4 Inch Round Tail Light

Sonically 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 housing and lens are sonically sealed together to create a single unit, which means that water will not get into the light and damage the diodes or circuit board.


Recessed-Mount Light

Recessed mount light

Recessed-mount trailer lights install underneath a housing or a grommet (A45GB - sold separately). These lights will extend into the mounting surface and require that a hole be cut into your trailer.



ST45RB Optronics Trailer Tail Light - Stop, Turn, Tail - Waterproof - Incandescent - 1 Bulb - Round - Red Lens

Alternate part number: ST-45RB




California residents: click here



Customer Reviews

Optronics Trailer Tail Light - Stop, Turn, Tail - Submersible - Incandescent - Round - Red Lens - ST45RB

Average Customer Rating:  4.8 out of 5 stars   (153 Customer Reviews)

4-1/4" Diameter round. Waterproof trailer light functions as a stop, tail, and turn signal light when properly mounted. Shock-proof socket protects incandescent bulb. Flush mount with grommet (sold separately). Accepts 3-prong plug.

- ST45RB
by: 08/28/2020

Excellent product and excellent price. Easy install. Ordered two extra for next time I need one. 870124



- ST45RB
by:

Reasonably priced and free shipping. What else can you ask for!! 868829



- ST45RB
by:

Perfect fit to my WW cattle trailer. 691759


Comments
Still working great. Was a perfect match to the original.
Gene - 08/22/2020

97691

- ST45RB
by:

Good reliable production 673122



- ST45RB
by:

Product arrived on time - just as described & exactly what we needed. Great price for both the product & shipping. 665555


Comments
The product worked great, but I cannot say how it is after a year, as I sold the trailer that I put them on. I do know they were exactly as expected - good product - & I have since recommended etrailer.com to others.
Rayshell - 07/09/2020

86442

- ST45RB
by:

Great product fast delivery. Very happy 650449



- ST45RB
by:

Nice lights. Very easy to install in about 5 minutes. Very durable at a great price 604512


Comments
just like the day I bought them
Richard - 02/13/2020

66664

- ST45RB
by:

best product, fast delivered 599521


Comments
Great, Still work perfect, good quality
Antonio R - 01/23/2020

64694

- ST45RB
by:

Love it! 596554



- ST45RB
by:

replacement lights arrived in a timely fashion. I was pleased with the cost of the item and how quickly it arrived. Thank you, Cary S. 581887



- ST45RB
by:

Great product at a great price! 563548



- ST45RB
by:

Just what I ordered in good shape and works great 558884



- ST45RB
by:

Great lights, very easy to install, perfect fit, great price and fast shipping. Couldn't ask for more than that. 549251



- ST45RB
by:

ETRAILER is a great company to do business with. I will definitely do business with ETRAILER again and also tell all our camping friends. 548368



- ST45RB
by:

Product as described 548292



- ST45RB
by:

OK for price 539307



- ST45RB
by:

Do you also sell the rubber seals? 527687


Comments
The rubber grommets for these lights are part # A45GB
Rubber Grommet for 4" Round Trailer Lights - PVC
$3.37
.
-- Heather A - 06/28/2018

40356

- ST45RB
by:

Hi guys, I'm usually the one answering reviews These guys are great! My client emailed the link & told me to order these for our horse trailers. They've held up, to the point, we're not even close to needing to replace them. We haul quite a bit. These lights have been tried & true, day & night. When you're hauling a lot of livestock, you want people that have no clue what that entails, to see your lights well before they get near your livestock ; these lights do the job perfect! We've outfitted 3 separate trailers with this company. We restored wires, lights, & pretty much everything along those lines ;from a 2 horse, to a large stock, & a gooseneck. All the parts come quickly, are all there, & work & fit great. What more can you ask for?! 517860



- ST45RB
by:

I always keep a couple of these on hand. They shipped fast and were the correct ones at a reasonable price. 503951



- ST45RB
by:

I have used etrailer before to fix lights on my old horse trailer. Info on the website gave me confidence I was ordering the right thing and the light came quickly and was exactly what I needed 489079



- ST45RB
by:

Good product at a fair price and fair shipping. The transaction was simple and smooth and the item was shipped fast. What more can you ask for? Totally happy with this company and will does business with them again. 481561



- ST45RB
by:

Great light. 479968



- ST45RB
by:

The lights look great fit right from China however great price. If I would have had opportunity to buy American made & paid 100% more I think I would have as they would have been about $4 pc. More. 474891



- ST45RB
by:

Fast shipping quality products Will be doing a lot more business with you 474184



- ST45RB
by:

Purchased to replace original equipment on my RV. That brand is apparently no longer made. It was a perfect fit and was such a good deal, I ordered 2 extra. 473650


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Show More Reviews

Ask the Experts about this Optronics Trailer Lights

  • How to Remove Tail Light That Has Rivets Holding the Grommet in Place
    It all depends on how the light installs. If it is like the Optronics part # ST45RB that installs with the grommet # A45GB then you should be able to remove it without removing the grommet. You may need access behind the light to do this though. If your tail light is more like the Optronics part # ST40RB though where the grommet is part of the light then you will need to remove the rivets by drilling them out and then use new rivets or even screws to install the new tail light (or the...
    view full answer...
  • Replacement Trailer Lights for Truck-Lite Products
    Part 40282R3 refers to a Truck-Lite brand round red-lens light. We have the Optronics stop/turn/tail light # ST45RB which is a direct replacement. This light uses a 3-prong plug # A45PB and can mount using grommet # A45GB. Part 50-19200Y3 refers to a Truck-Lite brand rectangular amber clearance light. As a direct replacement we have Optronics # MC65AB.
    view full answer...
  • Installing New Trailer Lights and Wiring on a Horse Trailer
    There isn't a kit available for what you are looking for, but you can still piece everything together. For grommets to use with the # ST45RB you would want the part # A45GB and then for a pigtail you would want the part # A45PB. Often times, people will run the wires from a 7-way such as yours to a junction box like part # 38656. From there, they will run the standard wire colors to the trailer lights, brakes and battery. I have attached a photo that shows how this setup works in...
    view full answer...
  • Replacement LED Trailer Tail Lights for a 2005 Gulfstream BT Cruiser
    Optronics trailer tail light # ST45RB is potentially a fit for your trailer if the existing lights are one of the following: Uni Bond # SE4000R Wesbar # 423541 Truck Lite # 40282R/40202R Grote # 52922 Peterson # 426R Bargman # 40-01-001 This information is likely on the light housing somewhere on your existing lights. The 2 knobs on the back are not an issue since this light would mount in a hole in the trailer or in mounting bracket # BK45BB both using grommet # A45GB. If...
    view full answer...
  • Troubleshooting Stop/Turn Signal of a Optronics Light part # ST45RB on a Trailer
    It sounds like the problem is in the wiring. If your light is a dual intensity light and both intensities are working with the running lights and brighter with the brake lights then the problem lies in the turn signal circuit most likely on your vehicle. You might test the trailer connector on your tow vehicle with a circuit tester like our part # PTW2993 like the video I attached shows to determine if the wiring of your vehicle is good. If the problem is in the vehicle wiring you will...
    view full answer...
  • Replacement 4 Inch by 2 Inch Round Tail Light for a 2006 Damon Intruder RV
    The closest match we have to your existing Glo-Brite taillight is the Sealed, 4 inch Round LED Trailer Stop, Turn and Tail Light, Flush Mount, 3-Function, 12 Super Diode, # STL23R-24B. It measures 4 inches in diameter and 1-15/16 inches deep. To install this light, you would also need Rubber Grommet for 4 inch Round Trailer Tail Lights, # A45GB, and Straight 3-Wire Pigtail for Sealed Trailer Stop, Turn and Tail Lights, # A45PB. Since this light is an LED, if you determine that it is...
    view full answer...
  • Troubleshooting Trailer Taillights Where Only One Side of Trailer Lights Work
    First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # PTW2993 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue. Make sure that the trailer side connector are...
    view full answer...
  • Replacement Tail Light Recommendation for a 2006 Damon Trailer
    All I really can say is that based on the measurements a previous customer of ours submitted about the tail lights that are on their 2006 Damon trailer the closest replacement we can offer is the Miro-Flex LED Trailer Stop/Turn/Tail Light # STL23R24B. It measures 4 inches in diameter and 1-15/16 inches deep. To install this light, you would also need Rubber Grommet for 4 inch Round Trailer Tail Lights, # A45GB, and Straight 3-Wire Pigtail for Sealed Trailer Stop, Turn and Tail Lights,...
    view full answer...
  • Wiring and Mount for Optronics 4 Inch Round Trailer Light # ST45RB
    Sealed, 4" Round Trailer Stop, Turn and Tail Light, Flush Mount, 3-Function Item # ST45RB has a plug in the back to accept pigtail # A45PB. On it the white wire is ground, black is for tail lights, and red is for brake lights and turn signals. This light can be mounted using grommet # A45GB with bracket # BK45BB. Or if mounting directly in a surface you would just need the grommet. I have linked videos of all of these parts for you.
    view full answer...
  • Can Bulb be Replaced on Optronics Trailer Tail Light # ST45RB
    I spoke with my contact at Optronics and he said that the Trailer Tail Light # ST45RB is a sonically sealed complete unit and the bulb cannot actually be replaced by itself. If the bulb goes out a new # ST45RB will be needed to replace it. I have attached a short video demonstration on this light that you can also check out.
    view full answer...
  • What Causes Dim Brake Lights on Yakima Rack and Roll Trailer
    With a trailer that is made of aluminum, you can experience grounding issues. Since you indicated that the light appears to work for the functions, but is dim when applying the brakes, I think this may be the problem. Due to vibration when in use, the wires can become loose, causing varied issues. I would first make sure all of the wire connections are secure on the trailer. You might want to check the ground wire connections on the trailer. Make certain the ground wire (usually white)...
    view full answer...
  • Is Optronics Trailer Light 12 or 24 Volt
    The Sealed, 4 inch Round Trailer Stop, Turn and Tail Light, part # ST45RB is designed to work with a 12 V system. I have attached a product review video for this light you can check out. This light accepts the 3-prong connector like part # A45PB. The grommet used with this light is part # A45GB and is sold separately. For a 4 inch light that is designed for a 24 volt system I recommend part # STL23R24B.
    view full answer...
  • Is the Optronics Trailer Light # ST45RB 12 or 24 Volt
    The Sealed, 4 inch Round Trailer Stop, Turn and Tail Light, part # ST45RB is designed to work with a 12 V system. I have attached a product review video for this light you can check out. This light accepts the 3-prong connector like part # A45PB. The grommet used with this light is part # A45GB and is sold separately. For a 4 inch light that is designed for a 24 volt system I recommend part # STL23R24B.
    view full answer...
  • How Does Trailer Light # ST45RB Mount into Mounting Bracket # BK45BB
    I went out to the warehouse and pulled Optronics Trailer Light, # ST45RB. First, you will need to place the Rubber Grommet, # A45GB, into the mounting bracket, # BK45BB. Next, you will need to press the light until it is seated all the way in the bracket. This last step actually takes some strength as the light is held in place by the grommet. I had to use some lubricate to get the light to seat all the way in the mounting bracket. Once in place, the light will not come out unless it is...
    view full answer...
  • 4 Inch Round White Trailer Backup Lights Needed for a Quick Loader Trailer
    Yes, we have the Sealed, 4 inch Round Trailer Back Up Light, # BU45CB, that has a clear lens and provides a white backup light. Along with the light you might also need a 4 inch round grommet, # A45GB, and a straight pigtail, # A45PB, or a right angle pigtail, # A47PB.
    view full answer...
  • Harness Availability for the Sealed, 4
    Yes we do carry the plug/harness for the light part # ST45RB. For that you would want the part # A45PB.
    view full answer...
  • Availability of a Round 4 inch Diameter Flush Mounted Clearance Light
    The part # ST45RB is a flush mounted red trailer light that is 4 inches in diameter. The part # STL42RB is also an option. It is LED 4 inch in diameter and has a flange mounted around the outside of it. For more similar options check out the link I attached that has all of the recess mounted 4 inch diameter clearance lights we offer.
    view full answer...
  • 2 and 4 Inch Diameter Trailer Lights, Grommets, and Harnesses
    I will be happy to help and give you some options. For 2 inch diameter red lights we have several options: # MC53RB (use grommet # A54GB and harness # A46PB) # MCL50RB (use grommet # A54GB and harness # A46PB) # MCL55RB (use grommet # A54GB and harness # A46PB) # MCL55R1224B (use grommet # A54GB and harness # A46PB) All in one option # MCL-50CRK # MCL155RB (use grommet # A54GB and harness # A46PB) For 2 inch diameter amber lights we also have several options: # MC53AB (use...
    view full answer...
  • Adding Lights to a Kuat Sherpa 2.0 Bike Rack on a 2015 Land Rover Evoque
    There isn't anything specifically designed for lighting on a bike rack so you're going to have to be a little creative here. Since the Kuat Sherpa 2.0 # SH22G is aluminum and you don't want to drill into it (Understandably so) you'll need to find a way to mount lights to it. Zip ties, like you mentioned, are going to be your best option. Tying a light like # ST45RB would be difficult to find a surface but might work. You'll also need a 3-wire connector # A45PB per light. Then you'll...
    view full answer...
  • Parts Needed to Install 4-1/2 inch Diameter Light in Trailer
    Yes, all three of the parts you mentioned are what's needed to install a light assembly in a 4-1/2 inch diameter hole. The light part # ST45RB fits the # A45GB, and the pig tail part # A4PB is the correct one as well.
    view full answer...
  • Troubleshooting Light Not Working with the Cargo Carrier Light Kit # 52014
    If you installed the Cargo Carrier Light Kit # 52014, which fits carriers # 52018F, # 52017, and # 52018, and all of the functions on one light are not working then it sounds like the problem is the light itself. If some of the functions worked on the light then I would say that you have a problem with the wiring somewhere. You can test the light by running a ground to the marked pin and then test the other 2 pins with a 12V power source. If you think that the wiring may be an issue...
    view full answer...
  • Is Peterson Red Round Replacement Lens # 420-15 Interchangeable with DZ 77-845 Tail Light
    The Peterson Red Round Replacement Lens, # 420-15, is not interchangeable with the DZ 77-845 light that you referenced but I may have a solution. For just a bit more than the cost of a lens, you could replace the entire light assembly with the Sealed, 4" Round Trailer Stop, Turn and Tail Light, # ST45RB. 3-Wire Pigtail, # A45PB, and Rubber Grommet, # A45GB, would be needed in addition to the light. Unfortunately we do not offer a replacement lens that will work for your current light.
    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...
  • Availability of Replacement Tail Light for Cargo Carrier Light Kit
    Yes it is. Part # ST45RB is the Sealed, 4 inch Round Trailer Stop, Turn and Tail Light, Flush Mount, 3-Function and will replace your existing light.
    view full answer...
  • Availability of 2 Inch Diameter 3-Function Taillight
    There is not a 3 function lamp available that has a 2 inch diameter. DOT regulations require that tail lamps meet certain size and visibility requirements. Clearance/marker lights can be smaller, but a 2 inch diameter taillight would not meet those requirements. There is a 4 inch diameter lamp, part # ST45RB. The lamp would typically mount in a grommet like part # A45GB set into an existing hole or using a bracket like # BK45BB.
    view full answer...
  • Are the Light Bulbs in the Cargo Carrier Light Kit # 52014 Replaceable Or is a New Light Needed
    The bulbs in the Cargo Carrier Light Kit For 52017 and 52018 Cargo Carriers, item # 52014, are not replaceable because the light housings are factory sealed to keep out water and road grime. The Light itself can be replaced though. Part # ST45RB is the Sealed, 4 inch Round Trailer Stop, Turn and Tail Light, Flush Mount, 3-Function and will replace your existing light.
    view full answer...




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Info for this part was:

Expert Research:
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Expert Research:
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Expert Research:
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Expert Research:
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Updated by:
Laura H
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Sarah W
Updated by:
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