It's a 4-gang light switch in the kitchen. I'd like to install a new light over the kitchen table. I was hoping to use the fourth switch on this unit (i.e. the rightmost switch in the photo) for the new light. That 4th switch doesn't seem to do anything (in that none of the other existing pendant and spot lights are affected by switching it). However, when I disconnect the 3 wires connected to that 4th switch, some of the other existing lights stopped working.
Can someone explain how this works?
