On a three-way, there’s an extra terminal, known as the “frequent.” Power comes in to the switch to the common, then two “traveler” wires hook up the 1st switch to the second to the brass terminals. To be about the safe side, take a look at the switch to ensure https://erickyxrmd.blogdiloz.com/33725124/the-smart-trick-of-smart-power-point-that-no-one-is-discussing