Okay. Got a dimmer switch and box from the hardware store. Was going to wire it into a three outlet extension cord. Followed the diagram and did hot wires to hot wires. The extension cord had one ground wire and two other wires. So I wired both those other wires to what the diagram makes it look like are the hot wires for the dimmer. However, doesn't work. Swapper the set up thinking maybe I put the power in onto the 'out' side for the dimmer. Still no go. Helps??