Need help badly with charging system

So my dart slant with pointsand single field sqaureback alt was doing fine till mid last week when I could hear the weakness turning over, checked battery and it was low 12.10v and I took it out charged it cuz I needed to get to work orderd a alt while at work. I put it in next day the battery dropped to 12.70 after charging it the day before and the new alt was only making my battery go up .01v every 15secs . I took off the regulator and realized one side was blacked sobs swapped it to a solid state 2 pin I had and no change.

So today I went and messed with it again and I cleaned all the terminals and connections and figured I would try a brand new volt regulator I had in the box (niehoff ) and no changed the battery goes up by the .01s so I was running out of ideas I went to the dash and tapped the ammeter and giggled the key the gauge went to charging the rpms lowerd I touched the gas and I got a nasty screech and the charging stopped and the rpms went up it.....I turned it off and tightend the ammeter nuts then restarted did same thing charged for a min and when I touched the pedal scream and charge stopped.

I'm sorry this is so long and drawn out but I am just listing everything I've done