When I turn the key to battery and the coils fire, the ammeter reads barely charging. When the car is running it reads in about the same spot. When I turn the headlights on it goes to almost full charge. I'm guessing the ammeter is wired up backwards?
Or the battery could be backwards. The battery should be negative ground.
Here's how it goes:
I set up my car using the diagram Steve posted and only had two issues:
1. My replacement ammeter was possibly manufactured for a Model A (positive ground) so I had to reverse the wires to the back of it.
2. I wish the high and low beams were identified by more than "black." Surely even the originals must have had at least a single coloured thread in either the high or low beam wire to keep them straight.