DRL Controller – Car LED Daytime Running Light Relay & Dimmer

DRL Controller – Auto Car LED Daytime Running Light Relay Harness & Dimmer

Upgrade your vehicle's lighting system with this compact, plug-and-play DRL (Daytime Running Light) Controller. Designed for car enthusiasts and everyday drivers alike, this intelligent relay harness manages your LED daytime running lights and fog lights with adjustable brightness, a smart delay timer, and stable voltage output — all in a weatherproof, easy-to-install package. Made in Mainland China.

Key Features

• Adaptive Brightness Control: Automatically adjusts LED output to minimize glare and maximize visibility across a wide range of driving conditions, from bright sunny highways to dense fog and rain.
• Dedicated Trigger Port: Intelligently manages fog light and driving light transitions via a dedicated trigger port, ensuring smooth, stable light switching during wet-weather driving.
• Auto Delay Function (10–30 Seconds): After ignition, the controller provides a 10–30 second post-ignition lighting delay — perfect for low-light exits from tunnels, parking structures, or rural roads.
• Wide Voltage Range (12V–18V): Operates stably between 12V and 18V to prevent overload damage and extend lamp lifespan, whether you're in a rainstorm or under blazing sun.
• Waterproof Connectors: Built-in waterproof connectors protect internal electronics from moisture intrusion, ensuring consistent, uninterrupted performance in all weather conditions.
• Simple Wiring: Red wire (crab fork) → battery positive; Black wire → battery negative; Red wire (OUT) → lamp positive; Black wire (OUT) → lamp negative. No special tools required.

Specifications

What's in the Box?

• 1 × Daytime Running Light Controller

Ideal For

Daytime touring, highway driving, commuters, and automotive enthusiasts looking for smarter, safer LED light management without complex installation.

Learn More About Vehicle Lighting Safety

Daytime running lights are recognized for improving road safety. Learn more about vehicle lighting standards and highway safety from the National Highway Traffic Safety Administration and general automotive safety guidance from the U.S. Consumer Product Safety Commission.

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Note: Due to lighting effects and display angles, slight color differences may appear. Minor dimensional tolerances may exist due to manual measurement.

Frequently Asked Questions

Q: What vehicles is this DRL controller compatible with?

A: This DRL controller works with most 12V–18V vehicles, including cars, SUVs, and trucks that use LED daytime running lights or fog lights. It is a universal relay harness, making it suitable for a wide range of makes and models.

Q: How does the auto delay function work on this DRL relay controller?

A: After the vehicle ignition is turned on, the DRL controller automatically activates your LED daytime running lights with a programmable delay of 10 to 30 seconds. This ensures smooth illumination timing during tunnel entry, exits, or low-light conditions without manual switching.

Q: Is the DRL controller difficult to install?

A: No — installation is straightforward. Connect the red crab-fork wire to the battery positive, the black wire to battery negative, and the OUT wires to the corresponding lamp poles (red to positive, black to negative). The waterproof connectors make it suitable for DIY installation without professional tools.

Q: Will this controller work with both fog lights and daytime running lights?

A: Yes. The dedicated trigger port design allows this controller to manage both fog lights and LED daytime running lights, providing intelligent switching and stable light transitions for improved visibility in varying weather conditions.