Flickering headlights. Malfunctioning headlights when using hi/low beams. Overloading the headlight switch. Overheating plugs. This is a h4/9003 12v headlight conversion wiring harness with hi heat. Ceramic plugs for cars that have upgraded halogen or xenon h4 bulbs. H4 2 headlight harness for headlight interchange:h4 conversions h6024 headlights. The stock headlight switch cannot handle the necessary power needed to light the hi watt halogen bulbs so headlights overload the headlight switch and end up making the lights dim, flicker,or turn off. this harness bypasses the power draw from the headlight switch and pulls the power directly from the cars battery, but still uses the stock headlight switch to activate the relays to turn the headlights on and off. The ceramic plugs wont melt like standard plastic plugs will from the higher heat that halogen bulbs put out. this is harness is a direct plug and plug with all the correct factory style plugs for the high and low beam headlights! Voltage : 12V Power: 60W Suitable for 12V H4 Light bulb Colour: black Material: ABS Package Contents: 1 * H4 Relay Wiring Harness kit Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.