Shit man this makes me look bad, I thought I had this issue fix (reason why there is a new battery, alternator and voltage regulator). What I found the issue before to be was actually none of what I replaced! The voltage regulator apparently goes through the ignition switch, so if something is wrong with it, your alternator won't charge. I pulled the switch (electronic part on the back of the tumbler your key goes into) and cleaned the contacts, checked the continuity in all positions and put it back it and my alternator started working again! This sounce like the same issue, so you might just need to replace that part.