Alternator not charging

"Goes up a couple of tenths." From what to where to whom? I don't know if it's going from .00000000005 volts to .2 volts, or from 14 to 14.2

Frankly I find it difficult to believe you have two with identical problems. Very unlikely. Just how did you " test " them?

What does voltage run AT THE BATTERY with the engine running at a good fast idle?