Okay, so this "oh the battery drained business" Is not what I thought.
Recently drove it to and from work. I live really close and it barely made it home. Gauge cluster turning off and Seatbelt light flashing.
I was driving on battery charge.
Checked fuses, grounds, and wires to alternator look good.
Car off power and ground at the alt read 12ish
battery voltage. Running it jumps down to 9.
The voltage regulator is inside the alternator. So, everyone says I'm better off just buying a new alternator. Instead of rebuilding.