Don't want to but in on burrpenick's thread so I'll start another one.
I have been playing with my charging system this weekend ('72 'cuda).
The alternator doesn't seem to be producing any charge.
I tried a couple of tests with a voltmeter and found the regulator and engine grounds are good (no volts drop there), but the Alt field wire that comes from the ignition is not reading a full 12 V (it's about 11 V).
The ammeter is in circuit but I didn't think it would cause as much drop as that !
Anyway, the other thing is that I've never actually had the car charging (it was in bits when I got it with no alternator).
The alternator is from a truck which was running OK so I guess it is good.
Any ideas before I buy another regulator ?