Flickering headlights. Malfunctioning headlights when using high/low beam. Overloading the headlight switch. Overheating plugs. This is an H4/9003 12V headlight conversion wiring harness with heat-resistant design. Ceramic plugs for vehicles that have upgraded halogen or H4 bulbs. H4 dual headlight harness for headlight interchange: H4 conversions, H6024 headlights. The stock headlight switch cannot handle the power required for high-wattage halogen bulbs, which may cause the headlights to dim, flicker, or turn off. This harness bypasses the power draw from the headlight switch by drawing power directly from the battery, while still using the original headlight switch to activate the relays for turning the headlights on and off. The ceramic plugs resist melting, unlike standard plastic connectors, due to the higher heat output of halogen bulbs. This harness offers a direct plug-and-play installation with factory-style connectors for both high and low beam headlights. Voltage: 12V Power: 60W Compatible with 12V H4 light bulbs Color: Black Material: ABS Package Contents: 1 x H4 Relay Wiring Harness Kit Note: Lighting and display differences may cause slight variations in the color of the item shown in images compared to the actual product. Measurement may vary by +/- 1-3 cm.