Charging system

Yes, no, yes, no.

The diagrams in the FSM are about as good as you can find.
Redrawing the circuits of interest is SOP, and was recommended in both Master Tech Service Conference sessions about how to use the diagram.

The alternator and the battery are both power supplies. Each has a strength and a weakness. But its basically a simple system that works the same way a water pump and cistern or water tower work. Another similar system is a air compressor and tank, except we rarely see those split.

The ammeter shows if the battery is charging or discharging. That's it. Nothing mysterious or terrible about it. Having one line from the battery means only one fusible link is needed. Better yet that link is not between the power supply (alternator) and the stuff its running.

Yes the starter relayfeed S2 and the ignition start feed J3 must be seperate. J3 is hot when the key is run position because its tied into J2A feeding the coil.

And yes I've posted diagrams of circuits.

Master tech Service Conference Index:
https://www.web.imperialclub.info/Repair/Lit/Master/
In PDF format
www.mymopar.com