On A 3-way, there’s an extra terminal, called the “typical.” Power is available in to your switch on the widespread, then two “traveler” wires link the primary switch to the 2nd over the brass terminals. If you do go with a dimmer switch, It's also advisable to know that CFL, https://p-hub-system84958.tkzblog.com/34592021/examine-this-report-on-wiring-to-switches