Charging problems 67 Barracuda

Mercy....
I'm not understanding the text or the pics. Voltage regulator is cased in black plastic ? I see blue in and green out which would be correct configuration for your car but how the heck is plastic regulator grounded ?
Other pic shows the ballast resistor. That is the 'silver box" you mentioned ? An extra wire ( wrapped with tape ) is attached with/where blue and brown attach ? And it goes to where ?