If the switch at the bottom of the stairway was "off," he could not turn the light "on" from the top of the stairway. Then he could turn the light "off" or "on" from the top of the stairway where the bedrooms are. Since the time the home was built thirty years ago he has had to turn the switch at the bottom of the stairway "on" first. He had a three-way switch at the top and bottom of a stairway. If you have a continuity tester, you can shut "off" the circuit breaker and test the switch to determine which screw connects to what. It is not uncommon to find that one switch in a three-way circuit uses one arrangement, but the other is from a different manufacturer and uses a different pattern for the screws. But, the screws for the wires running between the switches may be on the same side of the switch, or they may be on opposite sides of the switch at the same end of the switch. All of them have two screws on one side of the switch and one screw on the other side. Not all three-way switches are the same, either. When you encounter what was supposed to be a three-way circuit, and you can turn it "on" at one of the switches, but not at the other switch, unless the first switch is already "on," the problem is usually that one of the wires going into the switch is on a terminal for one of the two wires going out of the switch. This time it flows over the second of the two wires running between the switches. Now there is again a pathway for the electricity. Someone enters the same room near the switch at the right of the graphic.
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