How To Fix A Three Way Switch. Virtually every house has at least one set of three way switches. Two wires attach to brass screw terminals.
Most of the problems with these switches result from a miswired switch.
There are many ways that a three-way switch can be wired, but usually power or the light fixture connect to the load side of the switch and traveler wires run between traveler screws on both switches.
A three-way switch has three terminals, and the switch connects the first terminal to either the second or the third terminal, as shown here If you are trying to understand how a set of switches are wired in your house, using an ohmmeter or a continuity detector is the only way to reverse-engineer what. They may be at the bottom and the top of stairways. You may also need to cut additional breakers if either or both of the.