1965 Dart Charging System Question

A Power Probe is pretty neat. I hook it straight to both battery terminals, and then the probe itself shows the voltage at any point it touches. I don't think it does ground differences, so I use my multimeter for that in the way that you explained. With the Power Probe, I can also power up devices using battery voltage directly. I figured out I had a bad horn relay in my Skylark that way.

I think I'll eventually replace the 10-gauge wire from the battery to the relay, since that's a pretty easy one. The battery is old, but the car sits for most of the summer, and it fires right up in the fall, so I'll probably leave it for now. With that being said, the next turn of the key could result in a click. :)

Thanks for your detailed diagrams. Between those and studying the FSM wiring diagrams, I've learned a lot about the Mopar electrical system.