14-21 Toyota Tundra OEM LED Headlight Conversion Harness

Upgrade your 2014-2021 Toyota Tundra with genuine 2018+ OEM Toyota LED headlights using the Morimoto Toyota Tundra OEM LED Headlight Conversion Harness. Designed specifically for Tundra models originally equipped with halogen headlights, this vehicle-specific harness provides a true plug-and-play installation without cutting, splicing, or permanently modifying your truck's factory wiring.

Whether you're upgrading for improved visibility or a modern OEM appearance, this harness makes the conversion simple while maintaining factory functionality.

Designed for OEM Toyota LED Headlights

This conversion harness allows 2014-2021 Toyota Tundra models equipped with factory halogen headlights to use genuine 2018+ Toyota OEM LED projector headlights.

The harness connects directly between your truck's factory wiring and the OEM LED headlight assemblies, providing seamless integration while preserving the original headlight controls.

True Plug-and-Play Installation

Installation is quick and straightforward with no cutting or splicing required.

Features include:

• Direct OEM-style connectors
• Vehicle-specific design
• No relay harness required
• Factory-style fit and finish
• Completely reversible installation

The harness also keeps the low beams illuminated when the high beams are activated, just like the factory LED system.

Maintains Full OEM Functionality

The Morimoto conversion harness retains all essential factory lighting functions, including:

• Low beam operation
• High beam operation
• Daytime Running Lights (DRL)
• Factory headlight switch operation
• OEM-style electrical integration

Everything operates using the original controls inside the vehicle for a seamless factory experience.

Turn Signal Compatibility

The 2018+ OEM Toyota LED headlights utilize a 7443 front turn signal bulb, while earlier halogen-equipped Tundras use a 3157/4157 bulb configuration.

To ensure proper turn signal operation, a simple connector re-pin is required:

• Swap the purple wire
• Swap the black wire

This quick modification allows the turn signals to function correctly with the new OEM LED headlights.

DRL Compatibility

The harness supports factory-style Daytime Running Lights and is compatible with multiple Tundra trim levels.

Trucks Equipped with Factory LED DRLs

If your truck is a Platinum or 1794 Edition already equipped with OEM LED Daytime Running Lights, this harness directly powers the new LED DRL system.

Trucks Without Factory LED DRLs

For trucks not originally equipped with LED DRLs, an optional DRL Power Harness is available. This harness connects to a switched power source, such as the fuse box, allowing the LED DRLs to operate at full brightness just like the factory system.

Choosing the Correct Harness

Select the correct kit based on your factory halogen headlights:

H126

Choose this version if your original halogen headlights feature:

• A white LED strip along the lower edge used as the factory Daytime Running Light (DRL).

H126-LED

Choose this version if your original halogen headlights:

• Do not have the white LED DRL strip.
• Use the amber turn signal bulb as the factory DRL.

This kit includes the additional adapter harnesses required for those vehicles.

H126.1

The H126.1 harness is the additional adapter included with the H126-LED kit and is available separately only as a replacement part or if the incorrect conversion kit was originally purchased.

OEM-Quality Construction

Built to Morimoto's high standards, this conversion harness is manufactured using premium automotive-grade materials for dependable long-term performance.

Premium construction includes:

• Heavy-duty automotive wiring
• OEM-style sealed connectors
• Precision-crimped terminals
• Protective wire loom
• Weather-resistant construction

Designed for harsh under-hood environments, this harness delivers factory-quality reliability and durability.

Features

• Designed for 2014-2021 Toyota Tundra
• Converts factory halogen trucks to 2018+ OEM Toyota LED projector headlights
• True plug-and-play installation
• No cutting or splicing required
• No additional relay harness required
• Maintains factory low beam and high beam operation
• Keeps low beams illuminated with high beams
• Supports OEM Daytime Running Lights (DRL)
• Compatible with Platinum and 1794 Edition factory LED DRL systems
• Optional DRL power harness available for non-LED DRL models
• Simple turn signal connector re-pin required
• OEM-style connectors and heavy-duty automotive wiring
• Weather-resistant OEM-quality construction

The Morimoto Toyota Tundra OEM LED Headlight Conversion Harness is the premium solution for installing genuine 2018+ Toyota OEM LED headlights on 2014-2021 Tundra models. With vehicle-specific engineering, factory-style integration, and true plug-and-play installation, it delivers OEM functionality, modern styling, and long-lasting reliability.