Wiring A New Light Fixture And Switch May 7, 2019 Wiring Diagrams to Add a New Light Fixture . Clear, easy-to-read wiring diagrams and instructions to add a new light to an existing circuit. www.do-it-yourself-help.com 3 Black Wires Light Switch5 Wire Junction BoxCopper Wire Cable DefinitionTypes Of Trailer PlugsHow To Wire Your HouseBare Copper Grounding CableElectrical Wiring 101 BasicsHome Wiring Size