This upgraded H4 headlight plug-and-play harness takes the current directly from the battery after you turn on the headlights. The headlight switch is merely used to turn the headlights on and off. By using two 80 amp relays in this harness, it can handle up to 100 watt H4 bulbs. 

NOTE - This kit will not work with HID headlights, only the factory or H4 headlights

Kit includes - 1 upgraded plu-and-play headlight harness with two 80 amp relays and one 30 amp in line fuse installed with ceramic headlight connectors