Update:
Received the light checker from Jim; very excited to try it.
Plugged it in, turned the switch, and
Voila !! The red light went out ! Yeah !!
Started the the bike, all is good.
Turned it off, then turned it back on. The red light is back. Ran the bike........well, you get it, I'm sure.
The glitch somewhere in my bike killed Jim's light checker, probably the same way it killed mine.
Darn
I did, in fact, inspect the complete harness and connectors for shorts/opens.
Well, the lights are still working with my light checker plugged back in.
Thank you, Jim, for your generosity !