Do you have a service manual for your A100? I'd start with the wiring diagram in that service manual if you have it. The wiring diagrams in the 1965 service manuals were fairly simple and easy to follow. By the time the late 70s rolled around the factory wiring diagrams were getting super complex.

The one wire alternator won't show up in a factory diagram but you just hook the alternator to the hot side of the battery so that one is easy. There are a lot of wiring diagrams for various Dodge products on the internet but you can spend a lot of time looking for what you want so I recommend buying a service manual.