The two wall-mounted lights were indeed flickering in unison. There is a Lutron "Glyder" single-pole dimmer switch (two black wires and green ground) and three cables in one normal size box. One from below, two from above. There was only a single bare aluminum wire entering the box. None of...

I purchased a Lutron dimmer that has 2 black wires and one green. However, my bathroom outlet box does not have a green or copper wire. Connected to the switch is a red wire in the top screw and a black wire in the bottom screw. Within the outlet box it appears as if 3 black wires are capped...