Second question : In Diagram B , what is the return flow to the battery ? Third : how is all of this regulated ? Does this scheme require an internally regulated alternator ?
Question 2: In all these old cars the return is through the body chassis or engine block.
Question 3: The regulation is done through the field winding not the main charge output so nothing else changes. Your just by passing the ammeter and sending power through the firewall to power the interior electronics. Original brings in the full charging current through the firewall to the ammeter and taps off for the interior electronics from that.
