HD Relay: H7

The Morimoto HD Relay Harness MMH30 is designed to provide your HID lighting system with a clean, stable power supply directly from your vehicle's battery. Since factory headlight circuits are engineered to power halogen bulbs rather than HID ballasts, they often cannot provide the consistent voltage needed for reliable HID performance. The MMH30 eliminates voltage drops that can cause flickering, slow ignition, and inconsistent light output.

Whether you're upgrading your low beams, high beams, or fog lights, the Morimoto MMH30 ensures dependable power delivery for maximum HID performance and long-term reliability.

Why Install a Relay Harness?

A quality relay harness is one of the most important components of any HID conversion. Even premium HID bulbs and ballasts require stable battery voltage to perform at their best. The Morimoto MMH30 supplies consistent power directly from your vehicle's battery while reducing the electrical load placed on the factory headlight wiring.

Benefits

• Faster HID ballast startup
• Consistent light output
• Eliminates headlight flickering
• Improves ballast performance and lifespan
• Delivers stable battery voltage for reliable operation

Plug-and-Play Installation

The Morimoto MMH30 is engineered for a true plug-and-play installation with no cutting or splicing required. Its universal design and generous wire lengths make it suitable for installation on most passenger cars, trucks, SUVs, and off-road vehicles.

Installation is simple:

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

The result is a clean, professional installation that preserves your factory wiring.

Universal Compatibility

The MMH30 uses industry-standard ballast connectors, making it compatible with virtually all aftermarket HID lighting systems.

Ideal 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 generic relay harnesses that rely on a single relay to power both headlights, the Morimoto MMH30 features dual independent sealed 40A relays, with one dedicated relay for each headlight. This fail-safe design allows one headlight to remain operational should a relay ever fail, providing added safety and reliability.

Each relay features:

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

Designed to withstand moisture, dirt, vibration, road salt, and extreme temperatures, the MMH30 is built for years of dependable performance.

Premium OEM-Grade Construction

Built using premium automotive-grade materials, the Morimoto MMH30 delivers exceptional durability while maintaining a clean factory-style appearance.

Construction features include:

• Heavy-duty automotive wiring
• Abrasion-resistant Techflex braided sleeving
• OEM-style sealed relay housings
• Laser-engraved titanium gray anodized mounting bracket
• Weatherproof electrical connectors

The finished installation looks organized, professional, and factory-installed.

Features

• Supplies stable battery voltage directly to HID ballasts
• Eliminates flickering and inconsistent HID operation
• 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 materials and finish

Package Includes

• 1 × Morimoto HD Relay Harness MMH30
• Complete plug-and-play HID relay harness for one vehicle

The Morimoto HD Relay Harness MMH30 is the ideal wiring solution for enthusiasts who demand reliable HID performance and OEM-quality construction. Engineered with premium materials and advanced electrical protection, it delivers consistent power, dependable operation, and long-lasting durability for virtually any HID lighting upgrade.