How to Wire a Light (with Pictures) - wikiHow METHODWARNINGSTHINGS NEEDED Cut power to your circuit. The best way to do this is by turning off the electricity supplied to the circuit on which you will be working at the junction box (also called a fuse box) for your home. Switch the breaker of your fuse-box so the fuse for the circuit supplying electricity to your fixture reads "Off." It's always a good idea to double-check the flow of electricity by checking the Clean the old fixture and installation area. If the light you are wiring is in the ceiling, you should cleaSee all 6 steps on wwwhow40%(5)Published: May 07, 2011Views: 92K Wiring a light switch? Here's how. - Easy Do It Yourself Wiring a light switch With the power coming to the switch and then going to the lights, you will notice that there are two black wires, two white wires and two ground wires (bare wires). First of all we should connect the ground wires to the box.