Ok, can someone please point me to a possible direction.

History:

Replaced Battery and Rebuilt Alternator 2 months ago

Last week, got Battery Light, no reading of charging from Battery Post

Removed and brought back to Shop that Rebuilt Alternator

They said it was charging, but they changed out Voltage Regulator anyways

Put Alternator back in and nothing again.

Is there a Relay of some sort that excites the Alternator to start charging?