Update: I disconnected the battery again to do a parasitic draw test. (Mostly cause I just watched a YouTube video, and wanted to try it for myself). Came up with 41 milli amps. I'd say that's okay. Anyhow, I figured, what the heck. Last time I disconnected the battery, the lights started working again. So, I threw a fuse in and gave her a go. Starting at the door closest to where I was (right front). I popped it open then quickly shut it; Lights theater dimmed like they should. Yay! On to the right rear. I popped it open then quickly shut it; Lights stayed on. WTH!? I disconnected the harness for that door at the jamb. Walked around the car, trying all the other doors and the slider on the headlight switch. Everything worked like it's supposed to. Hmmm. Maybe on to something here. Will play with it some more tomorrow to confirm. It's late.
Now suspect the RR door actuator. Really!? The right rear? That's like the least used door!