H4-4
H4-4 Headlight Booster Harness
The ultimate solution for dim headlights on older vehicles. This H4-4 harness is not just a wire kit; it is the result of Yiou Guan’s precision modular manufacturing. We developed specific connectors based on universal standards to achieve a true "plug-and-play" installation without cutting any original wires. By bypassing aged, high-resistance factory wiring with our independent relay system, you can easily restore your vehicle's lighting potential with our professionally assembled factory product.
