How To Install A Light Switch With 2 Wires February 23, 2019 Technology . Technology - 2-Wire Smart Light Switch - Yoswit supports both with or without neutral wire (3-wire and 2-wire) installation. www.yoswit.com Household Light SwitchRed Wire OrHoneywell Thermostat Older Models PicturesWhite Black GroundTrailer Wiring Diagram 4 Pin FlatReplace Switch Box4 Pole 2 Way SwitchElectric Dryer Outlet