I have power coming to a receptacle. It's a half and half with the top half controlled by a switch. At the switch, the neutral is capped off. I want to put a switch next to it to run to my porch light. Do I have to run a separate feed line, or can I go off get power off of the existing switch that's there?
If there is a capped off neutral in the switch box, you can put in a second switch for another light, just as you want to do. You will have to figure out which of the existing switch wires is permanent, and hot and splice into that wire to supply the new switch.
Updated on March 12, 2018
By Dan Harmon