In the dining room we have dimmer switch when I open the switch we have 2 black wires into the switch. The blacks are connected via caps to a red and yellow wire (jumpers?) and the two white wires are capped together.
So the switch has two black wires only and there is no ground (bare wire or green wire)
If I want to install Lutron vacancy dimmer switch would I add the green to the white capped wires and each black to the red/yellow and bare wire on the Lutron to a screw into the box?