DavecUK Yeah, I opened it up again today. I reached out to the distributor I originally purchased it from, and they said they’ve seen occasions where the contact clips occasionally walk themselves back. I thought I might have seen some indications of this on the original switch. Anyway, I crimped them down with some needle-nose pliars, and put in a new rocker switch. Flipped it on, and we’ll see how it goes.
I inspected the wiring and traced all the connections I could find and it seems to look good, but like anyone who’s ever tried to figure out electrical problems on say, a car, those are famous last words. :-)