How do I determine if the power source is going right into the 3-gang box of switches, or directly to one of the fixtures (1 vanity light and 1 light/exhaust fan combo)? What is the best way to install new light fixtures (say over the shower and/or bathtub), taking power from the light of the light/fan combo?
Essentially, we are looking to have the current switch that turns on the light of the light/fan fixture also turn on the new lights. The other two switches will remain connected to their respective fixtures (the exhaust fan and the vanity lights). Thanks!