How to Wire Lights on a Trailer | Wiring Diagrams Nov 21, 20185 wire trailer wiring diagram. 5 way trailer wiring diagram allows basic hookup of the trailer and allows using 3 main lighting functions and 1 extra function that depends on the vehicle: daytime running lights; turn signals; brake lights; an extra pin allows using another extra function.5/5(2)Author: Andrew Demaree Light Switch Wiring Diagrams - Do-it-yourself-help 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. The hot and neutral terminals on each fixture are spliced with a pigtail to the circuit wires which then continue on to the next light. Light Switch Wiring Diagram (Single Pole) - 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..