HD Relay: H10/9145

Maximize the performance and reliability of your HID lighting system with the Morimoto HD Relay Harness H10. Designed to supply clean, stable battery voltage directly to your HID ballasts, this premium relay harness eliminates the voltage drops that often cause flickering, inconsistent light output, and difficult ballast startup.

Factory headlight wiring is designed for halogen bulbs, not HID ballasts. The H10 relay harness bypasses these limitations by delivering dependable power straight from your vehicle's battery, ensuring your HID system performs at its best every time you turn on your headlights.

Why You Need a Relay Harness

A relay harness is one of the most important components of any HID conversion. Even the highest-quality HID bulbs and ballasts cannot operate properly without a stable power source. The Morimoto H10 helps protect your investment by improving reliability, increasing ballast performance, and reducing electrical strain on your factory wiring.

Easy Plug-and-Play Installation

The Morimoto H10 is designed for a fast and hassle-free installation. Its universal layout fits most passenger cars, trucks, SUVs, and off-road vehicles without requiring any cutting or splicing.

Installation is simple:

• Connect the harness to the battery
• Plug into the factory headlight connector
• Connect your HID ballasts
• Secure the relays and wiring

That's it—your HID system is ready to perform.

Universal Compatibility

The H10 uses industry-standard ballast connectors and is compatible with nearly all aftermarket HID lighting systems.

Ideal for:

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

Note: Vehicles equipped with CANBUS electrical systems or pulsed Daytime Running Lights (DRLs) may require a Morimoto CANBUS or Mopar-specific harness instead.

Dual Relay Protection

Unlike many generic relay harnesses that rely on a single relay to power both headlights, the Morimoto H10 features dual independent 40A sealed relays. Each headlight is powered by its own relay, providing added reliability and ensuring one light remains operational should a relay ever fail.

Additional protection includes:

• Fully sealed weatherproof relays
• Silicone weather seals
• Integrated flyback diode for back-EMF protection
• Weatherproof connectors throughout

Designed to withstand rain, snow, heat, road salt, and harsh driving conditions.

Premium OEM-Grade Construction

Morimoto builds the H10 using premium automotive-grade materials for exceptional durability and a factory-quality appearance.

Features include:

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

The result is a clean, professional installation built to last.

Features

• Provides stable battery power directly to HID ballasts
• Eliminates flickering and unreliable ballast startup
• Universal plug-and-play installation
• No cutting or splicing required
• Compatible with most aftermarket HID systems
• Suitable for low beams, high beams, and fog lights
• Dual independent sealed 40A relays
• Flyback diode protection for improved electrical reliability
• Premium weatherproof construction
• OEM-quality fit and finish

Package Includes

• 1 × Morimoto HD Relay Harness H10
• Complete plug-and-play HID relay harness for one vehicle

Built with premium components and engineered for long-term reliability, the Morimoto HD Relay Harness H10 is the ideal wiring solution for enthusiasts looking to get the most out of their HID lighting system while maintaining an OEM-quality installation.