Over charging

...............Sigh...............OK let's start with year / make / model and what type charging system, AKA does the alternator / regulator match year model of the car, or is it an earlier (pre 70) Mopar converted to a 70/ later regulator, or "something else" like a Delco/ Denso "one wire" etc?

You are going to need a multimeter, maybe some alligator clip jumpers, and a service manual, which you can download many years over at MyMopar for free