HD Relay 880

The Morimoto HD Relay Harness H40 is designed to provide a stable and reliable power source for your HID lighting system by drawing power directly from your vehicle's battery. Since factory headlight circuits are designed to operate standard halogen bulbs—not HID ballasts—a relay harness is highly recommended to prevent flickering, intermittent operation, and unreliable HID performance.

Whether you're upgrading your headlights or fog lights, the Morimoto HD Relay Harness ensures your HID system receives the consistent voltage required for dependable operation.

Simple Plug-and-Play Installation

The H40 Relay Harness features a true plug-and-play design with no cutting or splicing required. Its universal wiring layout and generous wire lengths make installation straightforward on a wide variety of vehicles, from compact cars to full-size trucks and SUVs.

Simply connect the harness to the battery, plug it into your factory headlight connector, connect your HID ballasts, and your system is ready for operation.

Universal Compatibility

The Morimoto HD Relay Harness H40 is compatible with most aftermarket HID lighting systems and uses industry-standard ballast connectors that work with nearly all HID ballasts on the market.

Suitable for:

• HID Low Beam conversions
• HID High Beam conversions
• HID Fog Light conversions

Please Note: Vehicles equipped with CANBUS electrical systems or pulsed Daytime Running Light (DRL) circuits may require a Morimoto CANBUS or Mopar-specific harness for proper operation.

Dual Relay Fail-Safe Protection

Unlike many generic relay harnesses that rely on a single relay to power both headlights, the Morimoto H40 features two independent sealed 40A relays—one for each side of the vehicle. This fail-safe design helps ensure that if one relay ever fails, the opposite headlight remains operational for added safety.

Each relay includes:

• Fully sealed weather-resistant construction
• Ribbed silicone upper and lower seals
• Integrated flyback diode for back-EMF protection
• Weather-sealed connectors throughout the harness

Designed to withstand moisture, vibration, road salt, and harsh weather conditions, the H40 delivers years of dependable performance.

Premium OEM-Quality Construction

Built with premium automotive-grade materials, the Morimoto HD Relay Harness H40 offers exceptional durability and a clean factory-style appearance.

Construction features include:

• Heavy-duty automotive wiring
• Abrasion-resistant Techflex braided sleeving
• OEM-style sealed relay housings
• Polished stainless-steel relay mounting bracket
• Weatherproof connectors throughout

The finished installation looks clean, professional, and built to last.

Features

• Provides stable battery power directly to HID ballasts
• Eliminates flickering and unreliable HID startup
• Universal plug-and-play installation
• No cutting or splicing required
• Compatible with most aftermarket HID ballasts
• Suitable for low beams, high beams, and fog lights
• Dual independent sealed 40A relay design
• Flyback diode protection for improved relay durability
• Weatherproof OEM-quality construction
• Premium Techflex braided wire protection

Package Includes

• (1) Morimoto HD Relay Harness H40
• Complete plug-and-play wiring solution for one vehicle

Engineered for maximum reliability and long-term durability, the Morimoto HD Relay Harness H40 is the ideal upgrade for any HID lighting system, delivering consistent power, dependable performance, and an OEM-quality installation.