I went over to my parents' house and am trying to fix a combination switch. The old switch stopped functioning recently and my Dad had removed it. I do not know how it was wired previously but my Dad mentioned that it was non-standard. The old piece was a double toggle with two single pole switches similar to this product.
He tried installing a new switch but could not get both circuits to work.
I then attempted to diagnose the problem by reading voltages of the wires in the box. I first measured all wires in relation to the ground and had 4 at 60v and 1 at 0v. This didn't make sense so I started measuring the difference from each wire systematically. The annotated picture below is what I found:
I have a couple of questions now:
Why would there be 60v on the white neutral and the ground from the 3 cable romex?
How should I wire up a new switch? (It is the same product that was linked previously)
Thanks in advance.