Voltage at Taillights 66 Dart?

I realize your frustration. Electrical has always come "naturally" to me. I helped out a bit first time when I was maybe 12-13. Some guys were tryin' to wire up a flathead V8 in a 30 something Ford. I'd never seen one. The solenoid and push button weren't wired. They did not have much, but had a test light and battery. I figured it out and hooked it up. They were amazed.

Even so, I've never done 'show' or 'aircraft' quality wiring that you see sometimes nowadays LOL