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LED Transit Light - Parking and Turn Signal - Round - Surface Mount - Amber
Optronics

LED Transit Light - Parking and Turn Signal - Round - Surface Mount - Amber

Part Number: STL90A24B
In Stock
$37.93
Retail:$93.65
You Save: 59%
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7" LED turn signal and parking light seals out moisture with the included weathertight gasket. Hardwires to your truck or bus, and mounts on the surface with screws (not included). Great Prices for the best trailer lights from Optronics. LED Transit Light - Parking and Turn Signal - Round - Surface Mount - Amber part number STL90A24B can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (3)
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Optronics Trailer Lights - STL90A24B

Highlights

  • One Light, Two Functions: Brightens for parking and flashes for turn signal so others see you clearly.
  • Sealed Against Moisture: Included gasket creates a weathertight seal for lasting reliability.
  • Efficient LED Design: Draws only 0.243A for turn and 0.046A for tail, using less power and lasting longer.
  • Easy Surface Mount: Installs with simple screw mounting on flat surfaces; hardware not included.
  • Road Legal: Meets DOT and FMVSS 108 standards so you stay compliant on the road.
  • Built for 24V Systems: Compatible with 24V DC setups and backed by a lifetime LED warranty.

Features to know about

Brighter Lighting for Safer Driving: 7" Amber LED Signal and Parking Light

Visibility is everything when you’re on the road, and this 7" round amber LED light shines bright to make sure you’re seen. With 31 diodes, it gives a clean, even glow that brightens for parking use and flashes sharply for turn signaling. It’s built for 24V DC systems and draws just 0.243 amps on stop/turn and 0.046 amps on tail—so it stays bright while keeping power use low. LEDs last longer than traditional bulbs too, so you spend more time driving and less time replacing lights.

Keeping Moisture Out: Weather-Resistant and Sealed with Gasket

Road spray or rain can ruin a light fast, but this one keeps moisture out where it belongs. The included gasket forms a tight seal between the light and the mounting surface, creating a weather-resistant barrier that protects the LEDs inside. Whether you’re driving through storms or washing down equipment, this design helps prevent condensation or corrosion from creeping in.

No-Hassle Mounting: Surface Mount Design with Simple Wiring

Installing this light is straightforward thanks to its surface-mount setup. It secures with screws (not included) using the 6-1/4" hole spacing, so there’s no need for complicated brackets or cutting into panels. The wiring is simple too—just connect the white ground wire to metal, the red wire to the turn/brake circuit, and the black wire to your running light circuit if needed. That’s all it takes to get bright, reliable lighting up and running.

Built for Compliance and Long Service Life: DOT Approved LED Design

You won’t need to worry about meeting lighting standards since this light is DOT compliant and meets FMVSS 108 requirements. The solid-state LEDs are efficient, durable, and come with a lifetime warranty—proof they’re built to handle long-term use without flickering or fading. Once mounted, they just work, giving you peace of mind that your signals are visible and legal every time you hit the road.

Specs

Dimensions

  • Overall diameter: 7"
  • Thickness: 1-7/16"
  • Distance between mounting holes: 6-1/4"

Technical diagram of Optronics LED Transit Light STL90A24B showing round amber surface-mount design with detailed dimensions and mounting measurements.

Electrical

  • Compatible voltage: 24V DC systems
  • Power draw (Stop/turn): 0.243 amps
  • Power draw (Tail): 0.046 amps

Lighting

  • Diodes: 31
  • Lens color: Amber
  • Light type: LED turn signal and parking light

Compliance and Warranty

  • DOT compliant: Yes
  • Meets FMVSS 108 requirements: Yes
  • Lifetime warranty: On LEDs

STL-90A24B Transit LED Turn Signal and Parking Light - 31 Diode, 24 Volts - 7" Round - Amber

Replaces STL-90A24B and STL90A24B





Ratings & Reviews

5.0

3 reviews
Review sort icon
7" LED turn signal and parking light seals out moisture with the included weathertight gasket. Hardwires to your truck or bus, and mounts on the surface with screws (not included).

by:

Fantastic item..



by:

Just what I was looking for a 7 inch LED lamps for my motorhome



by:

Nice to have the LED lights on the bus! changing all of them so need to order more lights! lol


3
3

See what our Experts say about this Optronics Trailer Lights

  • 24V Lights Compatible With Prevost Coach
    Though The LED Trailer Clearance or Truck Cab Light # CBL22AB is only for a 12V system the only option we would have for you is to replace all the trailer lights on your trailer with lights that are compatible with 24V systems. We have a few select 24V taillights available for tail lights we have the Miro-Flex LED Trailer Tail Light # STL23R24B, The Transit Tail Light - Stop/Turn/Tail - LED - Submersible # STL90R24B. For Turn Marker Lights we have The LED Transit Turn Signal and Parking...
    view full answer...
  • Recommended Marker Lights and Turn Signals for Lowboy Trailer
    You can use the Optronics light, # STL90A24B, for this purpose. The White wire would ground to the trailer frame, the red wire would connect to the trailer wire carrying the turn and brake lights. The last wire would connect to the running light circuit. Check out the FAQ article I attached on trailer wiring also.
    view full answer...
  • Option for Towing Trailer with 12 Volt Lights with 24 Volt Tow Vehicle
    I think your only real option would be to replace the trailer lights on your trailer with lights that are compatible with 24 volt systems since there isn't an adapter available that we offer that would work for converting your 24 volt system to work with a 12 volt lighting system. Right now, we have a few select 24 volt tail lights. We have # STL23R24B and # STL90R24B. For turn/marker lights we have # STL90A24B and # STL23A24B. And for reverse lights we have # BUL23C24B.
    view full answer...
  • Converting a Trailer with 12 volt Lights to 24 volt Lights for Compatibility with a Euro Spec Truck
    I think your only real option would be to replace the trailer lights on your trailer with lights that are compatible with 24 volt systems since there isn't an adapter available that we offer that would work for converting your 24 volt system to work with a 12 volt lighting system. Right now, we have a few select 24 volt tail lights. We have # STL23R24B and # STL90R24B. For turn/marker lights we have # STL90A24B and # STL23A24B. And for reverse lights we have # BUL23C24B.
    view full answer...
  • Can the Transit Turn Signal and Parking Light Part # STL90A24B Operate as a Turn Signal Only
    If you just wanted the Transit Turn Signal and Parking Light part # STL90A24B to act as a turn signal then you would only need to use two of the wires, not combine the red and black like you mentioned. The white wire is for the ground and will need to be attached to a bare metal surface. The red wire would then be attached to the turn signal circuit on your RV. The black wire would not be used in your application. Please keep in mind that the above is an LED light which draws much less...
    view full answer...
  • Combined Trailer Turn Signal and Side Marker Running Light for a Trailer with no Side Markers
    On a trailer, the turn signals and brake lights are combined. So if you where to wire in a side marker light but also wanted to have it light up with the running lights, it would end up lighting up with the brakes as well. You can use the Optronics light, # STL90A24B, for this purpose. The White wire would ground to the trailer frame, the red wire would connect to the trailer wire carrying the turn and brake lights. The last wire would connect to the running light circuit.
    view full answer...


Info for this part was:

Employee Tyler C
Written by:
Tyler C
Employee Michael H
Expert Research:
Michael H
Employee Amy B
Updated by:
Amy B
Employee Brian T
Updated by:
Brian T
Employee Noah M
Updated by:
Noah M
Employee Carrie F
Updated by:
Carrie F
Employee Amanda K
Updated by:
Amanda K

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