Originally, there was a set of 3 light switches in one box. The 1st one switched my porch lights, the 2nd one switched my garage lights, and the 3rd was to switch an electrical outlet outside (used for Christmas lights). Each of these switches were hooked up with a live/line wire to provide the power + a load wire to pass forth the power to the light + a ground wire.
Now, the new smart (WiFi powered) light switches I am installing require a neutral wire. I found a bundle of 3 white neutral wires not connected to anything other than themselves with a wire nut. I know I can tap into this bundle of neutrals for the first 2 smart light switches, since they originate from the same areas where the live, load and ground wires originate from for the first 2 switches.
My question is about the third switch, as it has simply a live, load, and ground wire originating from its own separate area (not connected to any other wires/bundles). Please advise how I would get a neutral connection for the third light switch.
I've attached a picture showing the box with the three ground wires pointed down, the three live wires in the middle, and the three load wires at top. Farthest left column belongs to light switch 1, center column belongs to light switch 2, and the far right column (the isolated wires) belongs to switch 3.
BTW: I don't think they're on the same breaker, because originally I had switched off the breakers that I felt were sufficient for all the light switches, and when I returned to test the wires with a voltmeter I found that the third light switch's wires were still hot (while the first two were turned off). Then I went back to flip a few more circuit breakers off, and then finally the third switch's wires were no longer hot when tested.