- Cut five 12-inch strips of AWG 16-gauge wire; these wires are used to connect the three-way switches to a light bulb and battery. Strip 1/4 inch of protective plastic off the ends of the wire strips and then twist the exposed cooper metal strands to keep the strands of wire together. Cut five 1-by-1/2 inch strips of paper and label one strip of paper "N" meaning neutral. Label two more "H" meaning hot or live and then label the remaining two "T" meaning traveller. Stick the side of the strips of paper onto the center of each wire.
- Attach one end of the wire strip labeled "N" to one of the terminals on the light bulb holder; it doesn't matter which one. Attach the opposite end to the "-" terminal on the battery. Use a strip of electrical tape to hold the wire in place. Attach the end of one of the strips labeled "H" to the other terminal on the light bulb socket and then attach the opposite end to the terminal on the first three-way switch to the terminal labeled "H" or "L." It is also identifiable by its black terminal screw; the other two terminals have brass screws
- Attach one end of the two wires labeled "T" to the two other terminals on the first three-way switch. They may be labeled "T" or "C," which means common. They are also usually brass screws. Attach the opposite ends of the wires from the first three-way switch to the two terminals on the second three-way switch labeled "T" or "C." Attach the last wire strip labeled "H" to the remaining terminal labeled "H" or "L" on the second three way switch. Attach the opposite end to the battery terminal labeled "+" using a strip of tape.
- The three-way switch project is complete, so now you need to test the circuit. Turn on one of the switches. The light bulb illuminates. Change the position of the second switch and the light turns off. Change the position of the first switch again and the light turns on. This replicates how a three-way switch system works in your home.