Overcharging

Try to dig up a shop manual for '74.
This will give you a bit of head start., its based on a '73 which is similar. The factory diagrams for these years are little different than the earlier ones. So this should help you figure it out.

It is the same schematic as drawn above with some of the details revised to reflect the '73 Dodge shop manual's diagram.
upload_2019-10-2_18-38-33.png

Wires labels are usually like this:
A related to battery.
R for Alternator
J for 'Ignition' (which includes more than just ignition as you've probably noticed)

The number after the dash is wire gage followed by insulation color.

Open circle or square is a terminal connection.
Closed circle is welded splice.

Mymopar has some shop manuals digitized for pdf download.
You can also buy some good quality digital and print copies or even originals if you look around.