Several days ago my half hot switched plug stopped working so I bought a new plug and a new switch. The power source comes into the outlet box as a black, red and white wire. I have wired both the plug and the switch as indicated in the wiring diagram and the only exception to the diagram is that my switch box does not have a ground wire available for the switch. Is this the reason the switched plug won't work?
No, not having a ground on the switch won't make the outlet fail to work. When hooking up the switch, you didn't use the black that was in the same cable as the red, to go to the switch, did you? It should be spliced to another black in the box (from your description), with a short piece added to the splice to go to the switch.
Updated on January 8, 2018
By Dan Harmon