Re 574 no charging:
It depends on when and where your 574 was assembled.
Early models made and assembled in Doncaster UK would have Lucas electric generators and regulators, late models would have Lucas alternator with build in regulator.
Early models made in Doncaster UK and assembled in Louisville USA will have a Delco electric system with generator and regulator, later models will have a Delco alternator with inbuilt regulator.
But after 40 years who knows what upgrades have been installed.