Alternator field wires

While idling at 800 rpm I have 12.2v at the battery and 11.8v at the blue field on alt. I jumped 12v from the battery directly to the blue field and it continued to charge full steam. Swapped out a couple other used voltage regulators (unknown condition) and it did stop charging and after running a while it started charging again but again at full rate pegging the needle. When it was kinda working it was not charging at all. I turned on the blower motor on high and the amp meter needle dropped way down and no charge.
I had a big pile of used regulators from parts car but the potting melted and turned them into a big blob of crap. So I only have three to work with and one is confirmed bad. I have a brand new one around here somewhere but have not been able to locate it yet. Getting ready to start testing these used ones on my other dart to weed out the good and bad for sure.