I have a hallway light in a 4 way circuit configuration. The problem I have is that when the 4 way is in one position all three switches work correctly. In the other position one of the 3 way switches works, the other does nothing.
I have followed the troubleshooting guides by disconnecting the wires identifying the always hot, connecting it to the black common terminal on the first 3 way, tracing the hot and it's matching pair and connecting it to the 4 way switch. The switch does not have "In" or "out: identified. I have tried connecting to both sets of screws. (I am correct that the pair of screws to be uses are directly opposed (right and left of the switch, not both on the same side).
I then attached the travelers to the other set f screws on the 4 way switch and identified them and connected them to the brass screws on the second 3 way switch. I then connected the final wire from the lights to the second black screw. Per the instructions everything should work, but the same 3 way does not work. The other 3 way works regardless of the position of the 4 way.
Do I have a bad 3 way? perhaps a bad 4 way? HELP!!