Thanks! What do you mean by "the strapping?" I don't know what that means (sorry!).

I tried that connection setup first, as that made the most sense. Shortly after removing the cover, I made the newbie mistake of tightening all the terminal screws just because they were loose. Now I can't remember which of them might have been loose, as a clue as to which of them might have been originally connected to the house wiring. Dangit!!

I am at a loss.....