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How to Wire a Three-Way Electrical 12-volt Switch by Phil Altshuler . Three-way low-voltage switches are available in several different varieties. There are rocker, toggle and push-pull styles, and they come in a large number of colors and designs. These switches are in automobiles, boats and recreational vehicles. This first step will eventually send power directly to the Light fixture. B) Connect the Black (hot) wire (coming from the Romex cable that leads to your circuit panel) to your New 3-way light switch (#1) – you will connect the hot wire to the hot terminal on the 3-way switch, which is usually Black and stands alone. Wiring Diagram 3 Way Switch with Light at the End In this diagram, the electrical source is at the first switch and the light is located at the end of the circuit. Three-wire cable runs between the switches and 2-wire cable runs to the light. According to earlier, the lines in a 12 Volt 3 Way Switch Wiring Diagram signifies wires. At times, the wires will cross. However, it does not mean link between the wires. Injunction of 2 wires is generally indicated by black dot on the intersection of 2 lines. Take a closer look at a 3 way switch wiring diagram. Pick the diagram that is most like the scenario you are in and see if you can wire your switch! This might seem intimidating, but it does not have to be. With these diagrams below it will take the guess work out of wiring. Interested in a 4 Way Switch Wiring Diagram. Directions for Wiring a 3-Way Light Switch Yourself Turn off the correct circuit at your electrical panel. Add an electrical box for the second three-way switch in the basement. It’s likely you’ll also need to replace the existing switch box with a Feed a length of 14-3 type NM cable (or 12-3.