Our h7 relay wiring harness eliminates any common issues that may arise by upgrading your late model vehicle to a xenon-based headlight setup by drawing power directly from your battery instead of your headlight socket. This truly innovative design employs a heavy duty 40 amp relay module, as well as ample lengths of highest quality thermo-insulated 12 gauge wiring to cover any vehicle or motorcycle. Independent grounding points at both ballast outputs guarantees maximum voltage stabilization. And an inline 30 amp (replaceable) blade fuse is conveniently located next to the positive battery lead to ensure maximum safety and power efficiency. With most modern-day ballasts requiring a surge of over 20,000 volts on startup, this wiring harness is essential to stabilize the electrical load/stress on your vehicles’ electrical system and eliminates the common ‘flickering’ associated with HID kits installed without a relay kit.