Installing A Double Light Switch April 12, 2019 How to Replace a Double Light Switch . A double light switch is used to light two separate light sources from one area. www.doityourself.com Trane Thermostat WiringHow To Wire An Alternator DiagramReplace Thermostat WireHow To Wire A Light Fixture With Three WiresThree Way Light Switch TroubleshootingWiring Wall Lights DiagramHow To Add A Power OutletSquare D Air Compressor Pressure Switch Wiring Diagram