Installing Light Switch 2 Wires December 16, 2018 APNT. This application note explains the difference between 2-wire and 3-wire lighting systems and helps you understand which version you have in your installation. www.vesternet.comElectrical . diy.stackexchange.com Goodman Heat Pump WiringKenwood Kdc Bt330u Wiring Diagram2 Way Toggle Switch22r Ignition Coil Wiring DiagramHome Wiring CircuitWiring Diagram 7 Pin Trailer Plug10 Gauge 4 WireCeiling Light Circuit