Car wiring diagrams: 3 Way Switch Diagram 2 Lights, wiring diagram, wire wiring harness, schematic circuit diagram, wiring diagran, wireing diagram, wirring diagram, wiring daigram, wiring diagrams. This option is very similar to option when wiring a way switch. Here I am showing how to hook some lights up in series. If you need more than two lights, just .This diagram shows connections when the power comes into the first switch, on to the second switch and then on to two or more lights switched by the way .Need a Light Switch Wiring Diagram? Whether you have power coming in through the switch or from the lights, these switch wiring diagrams will show you the .