HD Relay: H3

The Morimoto HD Relay Harness H20 is designed to provide your HID lighting system with a stable, uninterrupted power supply directly from your vehicle's battery. Factory headlight circuits are engineered for halogen bulbs and often cannot provide the consistent voltage required by HID ballasts. The H20 eliminates voltage fluctuations that can lead to flickering, slow ignition, or unreliable HID performance.

Whether you're upgrading your headlights or fog lights, the Morimoto H20 delivers dependable power for maximum light output and long-term reliability.

Why Install a Relay Harness?

A relay harness is one of the most important upgrades for any HID conversion. Even premium HID bulbs and ballasts require a stable power source to perform properly. By supplying battery voltage directly to the ballasts, the Morimoto H20 improves startup performance, reduces electrical strain on the factory wiring, and helps extend the life of your HID components.

Benefits include:

• Faster ballast startup
• Consistent light output
• Reduced headlight flickering
• Improved ballast reliability
• Stable battery voltage delivery

Plug-and-Play Installation

The Morimoto H20 is engineered for a true plug-and-play installation with no cutting or splicing required. Its universal design and extended wiring lengths make it suitable for installation on most passenger cars, trucks, SUVs, and off-road vehicles.

Installation simply requires:

• Connecting the harness to the vehicle battery
• Plugging into the factory headlight connector
• Connecting your HID ballasts
• Securing the relays and wiring

The result is a clean, professional installation that maintains your vehicle's factory wiring.

Universal Compatibility

The H20 Relay Harness features industry-standard ballast connectors, making it compatible with nearly all aftermarket HID lighting systems.

Perfect 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 Lights (DRLs) may require a Morimoto CANBUS or Mopar-specific relay harness for proper operation.

Dual Relay Fail-Safe Design

Unlike many universal relay harnesses that rely on a single relay to power both headlights, the Morimoto H20 features two independent sealed 40A relays—one dedicated to each headlight. This fail-safe design allows one headlight to continue operating should a relay ever fail.

Each relay includes:

• Fully sealed weather-resistant housing
• Silicone weather seals
• Integrated flyback diode for back-EMF protection
• Weatherproof connectors throughout the harness

Designed to withstand harsh weather, vibration, moisture, and road debris, the H20 is built for years of dependable service.

Premium OEM-Grade Construction

Manufactured using premium automotive-grade materials, the Morimoto H20 combines outstanding durability with a factory-quality appearance.

Construction 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 finished installation looks clean, organized, and factory-installed.

Features

• Delivers stable battery voltage 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 systems
• Suitable for low beams, high beams, and fog lights
• Dual independent sealed 40A relays
• Flyback diode protection for increased electrical reliability
• Premium weatherproof construction
• OEM-quality fit and finish

Package Includes

• 1 × Morimoto HD Relay Harness H20
• Complete plug-and-play HID relay harness for one vehicle

The Morimoto HD Relay Harness H20 is the ideal solution for anyone looking to maximize the performance and reliability of their HID lighting system. Built with premium materials and engineered for long-lasting durability, it delivers consistent power and OEM-quality performance for virtually any HID conversion.