H4: GTR Bi-Xenon Harness

The GTR Lighting H4 / 9003 Bi-Xenon HID Relay Harness is engineered to provide the stable battery voltage required for maximum HID lighting performance and long-term reliability. While factory headlight wiring is designed to power standard halogen bulbs, HID ballasts require a clean and consistent power source. By drawing power directly from your vehicle's battery, this relay harness eliminates flickering, startup issues, and voltage fluctuations while maximizing the performance and lifespan of your HID lighting system.

Stable Battery Power for Maximum HID Performance

A relay harness is an essential component of any HID conversion or Bi-Xenon projector retrofit. Instead of relying solely on the factory headlight circuit, the GTR Lighting relay harness supplies direct battery power to your HID ballasts, ensuring fast ignition, consistent brightness, and dependable operation in all driving conditions.

Advanced 8-Pin Relay Technology

Featuring a third-generation 8-pin relay, this harness incorporates an integrated capacitor that stores electrical energy during the transition between low and high beams. This advanced design eliminates interruptions caused by brief signal gaps found on many modern vehicles, allowing your Bi-Xenon projectors to switch smoothly without flickering or ballast shutdown.

The weather-sealed relay connector provides superior protection against moisture, dirt, and corrosion for reliable operation in all weather conditions.

Universal Vehicle Compatibility

Designed to work with both positive-switched and ground-switched headlight circuits, the GTR Lighting H4 / 9003 relay harness offers broad compatibility with domestic, import, and European vehicles equipped with H4 (9003) headlight systems.

Perfect for:

• HID Conversion Kits
• Bi-Xenon Projector Retrofits
• Hi/Lo HID Systems
• H4 / 9003 Headlight Applications

True Plug-and-Play Installation

Installation is quick and completely plug-and-play with no cutting or splicing required. The harness connects directly to your factory H4 / 9003 headlight connector while drawing power from the battery through heavy-duty relays and wiring. Long wire lengths provide flexibility for installation on compact cars, trucks, SUVs, and larger vehicles.

Premium OEM-Quality Construction

Manufactured to GTR Lighting's premium quality standards, this relay harness features heavy-duty Techflex braided sleeving that protects the wiring from abrasion, heat, and vibration. The relay is enclosed in a durable anodized aluminum housing with laser-engraved branding, delivering exceptional durability while maintaining a clean OEM-style appearance under the hood.

Features

• Designed specifically for H4 / 9003 headlight applications
• Supplies stable battery voltage directly to HID ballasts
• Eliminates flickering and inconsistent HID operation
• Advanced 8-pin relay with integrated capacitor
• Smooth low and high beam switching for Bi-Xenon projectors
• Compatible with both positive- and ground-switched headlight circuits
• True plug-and-play installation with no wire cutting or splicing
• Heavy-duty Techflex braided wire protection
• Weather-sealed OEM-grade relay connector
• Long wiring suitable for cars, trucks, and SUVs
• Premium GTR Lighting engineering and construction

Whether you're installing an HID conversion kit or performing a custom Bi-Xenon projector retrofit, the GTR Lighting H4 / 9003 Bi-Xenon HID Relay Harness delivers the dependable power, seamless operation, and premium construction needed to maximize the performance of your HID lighting system.