What does the headlight relay do? In light bulbs consuming excess current, the headlamp relay is overloaded and prevents the button from burning. It provides strong burning of low -power burning headlamps and prevents light tremor in the headlight. Features: The headlight relay consists of two independent relays in the same packaging. The headlight relay provides continuous maximum lighting in vehicles used. It minimizes the battery consumption by eliminating the need to use H Type Bulbs. It prevents the failure of the long-short selector or fog lamp switches that are often failed. It is a relay where you can connect the long, short or fog light. It is also extremely resistant to shaking, vibration and moisture. As a result of this durability, it works safely in all kinds of climate and weather conditions. Assembly scheme.