High charging, but new interior harness?

so I figured I would post here in case anyone ever comes across this problem.
I took out my instrument panel to install a new speaker and when i did that i made sure to clean up all the connections back there, just because. so any plug has been cleaned and dielectric greased and everything was put back together.
I also took my alternator to an alternator shop and had it rebuilt, my stator was all burnt out and maybe some connections were dirty....who knows.
Just installed the new alternator, and the high charging problem is now gone! Maybe there were some corroded connections at the alternator, maybe behind the dash. I had also as part of the trouble shooting cleaned up the ground to the battery, and to the voltage regulator but those didn't change anything before.

soooo, it was either the alternator being bad (my suspicion) or a bad connection that i cleaned up when i put everything back together to install the new speaker.