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Toyota Tundra OEM LED Headlight Conversion (2014-2021)

4 Reviews

Brand: TRS




PART #: 2 x H126


Introducing the Toyota Tundra OEM LED Headlight Conversion Harness – your ticket to a sleek and modern upgrade for your 2014-2021 Toyota Tundra truck. Say goodbye to the hassle of cutting, splicing, or modifying your factory harness because our harnesses are designed to seamlessly adapt your vehicle to the 2018 OEM LED Headlights from Toyota. Experience the Plug n Play convenience that keeps your low and high beams effortlessly controlled using the original cabin switches. Plus, our harness ensures that the low beams stay on when you switch to high beams, providing optimal visibility. Worried about compatibility? Don't be! Our harness is nearly plug n play, and a simple re-pinning of your truck's connector will make your blinkers work like a charm. Upgrade your DRL (Daytime Running Lights) effortlessly with our harness. Whether your Tundra already has OEM LED DRLs or not, we have you covered with an optional DRL power harness.


  • Seamless Upgrade: Adapt your 2014-2021 Toyota Tundra to 2018 OEM LED Headlights without modifications.
  • Plug n Play: Easily control low and high beams using original cabin switches.
  • Enhanced Visibility: Low beams stay on with high beams for better road illumination.
  • Universal Compatibility: Simple connector re-pinning ensures blinker functionality.
  • DRL Ready: Upgrade Daytime Running Lights with an optional harness.


  • Harnesses: 2x (One Pair) Tundra OEM LED Conversion Harnesses

  • Optional DRL Adapter: 1x Adapter


This product includes a 2 Year limited warranty, serviced and supported by our team in Atlanta, GA. This warranty does not cover modifications, alterations, or misuse. For additional information, contact us.


  • Functions: 100% Retained

  • Bi-LED: Keeps Low Beam on with High Beam

  • Wiring: Plug and Play


  • Toyota Tundra: 2014-2021

  • TRUCKS W/O OEM LED DRL: Req. optional DRL Power Harness


Modernize: Designed to adapt the 2014-2021 Toyota Tundra trucks to the brand new 2018 OEM LED Headlights from Toyota, these harnesses will allow you to upgrade to the most modern OEM look without cutting, splicing, or modifying anything on the truck's factory harness.

NOTES: If your original halogen reflector style headlights have a white LED strip on the lower edge of the headlight that acts as your Daytime Running Light (DRL) use the drop down for part number H126, it comes with the 2 harnesses you need to do the conversion to OEM LED headlights. If your original halogen reflector headlights DON'T have that strip, but instead they have an amber turn signal bulb that is always running (DRL), select the option above for H126-LED which comes with the same harnesses but ALSO comes with the extra harnesses needed for this headlight type.

*The third harness listed (H126.1) is the same harness that's included in the H126-LED kit, but listed and able to be purchased separately if needed. Only buy this if you need a replacement or ordered the wrong conversion harness kit in the first place!

Plug n Play: It's a seamless solution to keep your low and high beams under control on the new OEM projector lights using the original controls inside the cabin. The outputs will plug directly into the multi-pin connector on the back of each headlight from Toyota, and the inputs straight from your truck. You DO NOT need any other relay harness for this to work - its as clean as it gets! This harness keeps the low beams on when you go to high beams as well!

Compatible: Though the harness itself is completely plug n play, due to the fact that the new headlights use a 7443 front turn signal bulb inside the lights versus the original 3157/4157 - you will just need to re-pin the connector coming from your truck in order to make the blinker work properly. Simply swap the purple & black wire, and voila! good to go.

DRL Ready: If you've got a Platinum or 1794 edition Tundra with the OEM LED DRL's already, this harness will adapt your wiring to power the new DRL feature with ease. If your truck does not have the OEM LED DRL now...not to worry! just select the optional DRL power harness. It just needs hooked up with a switched power source such as the fuse box and then you're good to go too. DRL's will always been on at full intensity with this harness.

LED Heads: If you're buying this harness, then you're obviously buying the headlights too. TRS also offers em, and they can be found online HERE

Trusted: For more than a decade, we've worked hard to earn our killer reputation. Car guys world-wide know that TRS carries the internet's If we sell it, then you bet we've put it to the test on our own cars, trucks, and bikes. Need a recommendation on parts for your project? Got a tech question? Wholesale inquiry? Contact Us

Ratings & Reviews

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Easy install


Super clean install and perfect fit and function! Well done TRS!


Exactly what i needed! Made for fast and easy swap!


Used this harness to painlessly swap out my 2018 sr5 halogen headlight housings (with LED DRL) to upgraded OEM 2018 LED headlight housings! Hardest part was reversing the polarity on the turn signal connectors and even that was easy once i popped the white piece off and depressed the catch with a small screw driver. This conversion took no longer than replacing bulbs in this vehicle. Thanks so much for making it so easy to upgrade my headlights!!!

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