When I moved into my house, I replaced the wired doorbell and chime with a wireless system. I am now looking to install a Ring Doorbell Pro, which is wired. So, I need to put in a wired door chime. I have two cables coming out of the wall for the door chime that I had not labeled. One cable has three wires - a yellow and green tied together and a black. The second has four wires - yellow and green tied together, black, and red. I do not know where the transformer is. I took a volt meter to every combination of those seven wires and got no reading. Is that because the doorbell is wireless? Any help is appreciated. Note: I did read every thread related to this.

I have two rooms in the house where the ceiling fan lights dim with vacuum running. I looked at the wiring for outlets and tried with nothing else plugged in with same result. I took the face plates off the lights switches and these two rooms are wired differently than my other rooms with fans not experiencing this issue. In the affected rooms there is a red and black wire pushed into the back of the light switch with a second black wire wrapped around the screw post which then terminates at the fan switch. The fan switch has a second black wire plugged into it. Both are grounded. In the unaffected rooms there is only one red wire and one black wire on the light switch with the black wire shared between the light and fan switches. Can I just take the extra black wire out of the affected light switches and cap it? This is the only difference and think it is causing my lights to dim in the two rooms.