Just to help explain a few of the weird posts:
Don't do this:
I was having a hard time getting the voltage, it was mostly because I was using the voltmeter to look for AC voltage. I thought maybe that there was an internal regulartor screwing me. I pulled it apart to find nothing.
While re-assembling this alternator, I must have not got the back brush in correctly. It took a crap at flat nasty and would no longer put out any voltage. We stole a brush from kart racers grinder and made a spring out of mechanics wire. It worked for about 5 minutes and then died
I went and picked up a new alternator today and installed it. Everything works great.
So, don't tear it apart! lol. If it is a Big case Ford Alternator. It will not be internally regularted at all.