O-NEX H4 9003 HB2 Bi-Xenon HID Relay Harness Wiring Controller 12V 35W 55W | Heavy-Duty Weatherproof Kit

• BI-XENON HIGH/LOW CONTROL: Specifically designed for H4, 9003, and HB2 dual-beam Bi-Xenon HID replacement kits. Smoothly manages high and low beam switching directly using your vehicle's factory headlight switch.
• HEAVY-DUTY BATTERY POWER: Draws direct, stable power from your 12V vehicle battery to protect stock wiring, eliminate flickering, and ensure consistent 35W or 55W ballast performance for both headlights.
• PLUG & PLAY INSTALLATION: Connects directly to one side of your factory headlight socket without cutting, splicing, or wire modifications. Includes built-in inline fuse and weather-resistant connections.
• DUAL-SIDE COVERAGE: One single harness powers both the left and right side HID ballasts and bulbs, ensuring equal power distribution and synchronized high/low switching across both headlights.
• FITMENT REQUIREMENT: Designed strictly for 35W and 55W H4 / 9003 / HB2 Bi-Xenon (dual-beam) HID. Will NOT work with single-beam HID bulbs or standard halogen headlight setups.

• Connect to Battery — Attach the red ring terminal to your vehicle's positive (+) battery terminal securely.
• Route & Connect Ballasts — Plug the ballast connectors into your HID ballasts on both sides, ensuring proper fit.
• Connect Bulbs & Main Harness — Attach the small control plugs to your HID bulbs, then connect the main input to your headlight socket.
• Secure Ground & Test — Ground the black wires to chassis, turn on headlights, verify flicker-free operation.

Typical situations where O-NEX H4 9003 HB2 Bi-Xenon HID Relay Harness Wiring Controller 12V 35W 55W | Heavy-Duty Weatherproof Kit helps — illustrative scenarios, not customer reviews.