Three knob pull positions: In – Mid – Out. In = Headlamps Off; Mid = Parking Lights and Tail Lights On; Out = Headlights and Tail Lights On O-ring seal in mounting stem, gasket seal at terminal insulator. Four screw terminals, diecast case, silver contacts, mounting stem with 7/16"-28 thread. 20A per circuit at 12V DC. With sealed shaft to prevent penetration of dirt and moisture.