If you want to fit headlights with higher-than-standard-wattage bulbs, you must install the Heavy-Duty Wiring Loom to prevent damage to your factory headlight wiring. The Heavy-Duty Wiring Loom will transfer power directly from your battery to your high-power headlights and will prevent heavy power loads from harming your factory wiring harness. Installation is very simple as the Heavy-Duty Wiring Loom simply plugs into your stock wiring harness' connectors.