Find the correct wiring for a 3-way switch in 2-minutes Click to view on Bing2:07How to determine the correct wires to attach to a 3-way switch when the wire and screw terminal color code is not certain. 4 ways switch wiring (tagalog) - Duration: 40:10.Author: MarVistaCatViews: 280K 3 Way Switch Wiring Diagram - Easy 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 Wiring a 3-Way Switch - how-to-wire-it Each 3-way switch in these examples are controlling the power source to the same load. When wiring a 3-way switch circuit, we will be using a 3-wire cable known as romex coming from the source (such as the breaker box). Then a 4-wire cable going between the two 3-way switches and then a 3-wire cable going from the switches to the load. 3-way Switch Wiring - Electrical 101 Typical 3-Way Switch Wiring, NM Cable. In the 1st diagram below, a 2-wire NM cable supplies power from the panel to the first switch box. The black (line) wire connects to the common terminal of the first 3-way switch. A 3-wire NM connects the traveler terminals of the first and second 3-way switch together. 4 Way Switch Wiring Diagram - Easy A 4 way switch wiring diagram is the clearest and easiest way to wire that pesky 4 way switch. I have a few of the most common ways in wiring a 4 way switch to help you with your basic home wiring projects. 3 Way Switch Wiring Diagram 4 Wires - Wiring Diagram 3 way switch wiring diagram 4 wires. The ground wire is pigtailed with a wire connector at the switch boxes and the ceiling box. With these diagrams below it will take the guess work out of wiring. Two wire cable runs from the light to sw1 and 3 wire cable runs between sw1 and sw2. electrical - Replacing 3-Way Light Switch with 4 wires I'm trying to replace an older style 3-way switch with a newer one. When I pulled the older one out, the wires weren't clamped down very well and 3 of the 4 (yes, 4) wires popped out of place before I had a chance to look and see what was where.