Instructionsfor Dimmer Switch Wiring. STEP 1. The typical 3-Way switch wiring has two screw terminals at one end of the switch. This is where the "travelers" are connected. The opposite end of the switch has one screw terminal which may be a different color as seen here in this photo.
A4-way switch has four terminals that provide two sets of toggle positions. When the switch is in the up position, the current can flow through two terminals. In the down position, the current flows through the other two terminals. Visually, imagine that a 3-way switch connects traveler wires from that switch to one side of the 4-way switch
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