Alternator Troubles! 1973 Plymouth duster 318

CrazyBlaize said
Hey yall, I've Been slowly working out all the electrical gremlins in my car for the past year, and I have 2 big ones left. but as of right now, id like to figure out why my alternator isn't charging, the main Wire (I don't know the correct names of these Wires) reads a constant voltage from the battery and slightly drops when under load (E.I putting the key in the ON position) but the BLUE and GREEN wires (Field wires?) show no voltage what so ever.

The main wire is the alternator output wire. It is connected to the battery output wire and the main circuit feeds.
On a standard circuit these are all joined at a welded splice. On a car with a rear defrost grid, or fleet high output alternator, its split up a little.

The blue field wire is a part of the ignition run circuit. One branch goes to the voltage regulator - which can be considered the 'sense' wire. Another branch goes to the alternator to supply power to the rotor.
It and the green field wire are explained here: Identifying Chrysler Alternators (1960-1976)

CrazyBlaize said
so here's my main question; Where do I start?

Start with the linked post about alternators.

When done with that, your job will be to trace back the blue wire to find out where the break in the circuit is.
Green wire will not have power unless the blue wire has power.