How does it work?

Autoswitch detects or senses on the trigger wire connected to the high beam wire, or a tail brake bulb wire or a turn signal cancel button, for example. The circuit then controls a high power relay (included with a light kit or widely available) by applying or removing 12 Volts to the relay. The relay then passes high power to any accessory such as driving lights. Any accessory with a power draw under 200mA (GPS, Cellphone charger, small LEDs lights) can be powered directly by Autoswitch.