I have a two-gang box where one of the switches is a single-pole switch, and the other one is a 3-way switch. I'm trying to replace the single-pole switch with a smart dimmer, the instructions don't quite match what I have in my wall. I want to makes sure I'm not doing anything wrong.
The switch I'm installing (Leviton DZ6HD) does not have any wires sticking out of it, so I have to install the wires directly into/onto it. The instructions show a neutral coming from the top of the box and tied together with a neutral going to the bottom of the box as shown below (2 is neutral).
In my wall, there are three white wires that all connect together and none of them to any switch. I assume that there is one neutral for each switch, and one return. Below is a diagram I made of how the wiring in my switch is (the orange one is bare copper wire).
So my question is, do I need to just go buy some white wire and run it from the switch where the neutral wire goes, to the bundle of 3 neutral wires (making it now a bundle of 4 wires). This makes sense to me, but I want to make 100% sure so I don't burn the house down.
Also, should I just completely ignore all the wires that are attached to the right 3-way switch as they seem all pretty isolated?