Tip & How-To about Hammering
Three way switch wiring can sometimes get confusing. If you are wiring or replacing a 3 way switch, and it is not working quite right, you probably got a wire mixed up.
The proper way to wire the switches is to run a 4wire cable between the switches. That is black, white, red, green.
In all electrical installations, the green wires are interconnected and also pigtailed and connected to the metal wall boxes and to the green screws on switches, receptacles, or lights.
On the 3 way switches there are a pair of like colored screws, usually brass. These are for interconnecting the switches. The red and black of the 4 wire cable connect to these terminals at each switch.
The other wires are connected in different ways for differebnt situations. Look at these sketches for cases where the cables for the light and power are in separate wall boxes..
and for when the light and power cables are in the same wall box..
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