Light Switch Wiring Diagram - Easy Whether you have power coming in through the switch or from the lights, these switch wiring diagrams will show you the light. Light Switch Wiring Diagram (Single Pole) This light switch wiring diagram page will help you to master one of the most basic do it yourself projects around your house Light Switch Wiring Diagrams - Do-it-yourself-help One source is spliced to each switch with a pigtail to power the two lights. Multiple Light Wiring Diagram. This diagram illustrates wiring for one switch to control 2 or more lights. The source is at SW1 and 2-wire cable runs from there to the fixtures. Wiring a 2-Way Switch - how-to-wire-it Black wire = Power or Hot wire White wire = Neutral Bare copper = Ground. When wiring a 2-way switch circuit, all we want to do is to control the black wire (hot wire) to turn on and off the load. This simple diagram below will give you a better understanding of what this circuit is accomplishing. Power Switch Repair 101 : eReplacementParts 4. Closely Examine the Switch ' s Wiring and Draw a Diagram. This is the most important step for every power switch replacement. Inspect wiring closely, and mark wires with masking tape if needed. Draw a diagram of the tool ' s wire configuration leading into and out of the switch assembly.