Switch Three Way Diagram. The power source is coming to light switch first. In the ceiling light fixture electrical box one black wire from a 3 way switch gets connected to the black load wire on the light fixture.
The black and red wires between sw1 and sw2 are connected to the traveler terminals. To get started take a look at the first diagram below. This wire diagram shows the wiring for source power into the first three way switch then 3 wire cable to the next 3 way light switch and then on to the light or light fixtures.
The power source is coming to light switch first.
3 way switch wiring diagrams easy to understand fully illustrated and documented. This wire diagram shows the wiring for source power into the first three way switch then 3 wire cable to the next 3 way light switch and then on to the light or light fixtures. Three wire cable runs between the switches and 2 wire cable runs to the light. The first step in any electrical project is to make sure there is no power going to the circuit you plan to be working on.
