3 Way Switch Diagram Common. Most switches have the common marked. Tag that wire with electrical tape and identify as the common (line or load) in both the switch wall box and remote wall box.
2002 nissan altima bose stereo wiring diagram july 4, 2019; 1 trick that i 2 to print out a similar wiring diagram off twice. One 3 way switch must have the circuit power supply ungrounded conductor (aka hot) attached to its common screw, and the at the other end of the switch circuit another 3 way switch must have the switched fixture feed (ungrounded conductor {aka hot}) attached to its common screw.
This might seem intimidating, but it does not have to be.
With conventional wiring, the common wire from one switch connects to line, the common wire from the other switch connects to the load. The source neutral is spliced through to the light fixture using the white cable wires at each box. Way switches between 3 way switch (1st) and 3 way switch (last). Most switches have the common marked.