This will be my charging issue post. I will update this post as it develops.

Symptoms:

1. Car is not charging the battery
2. Battery Idiot light is on (As are the brake and brake wear lights)

Info:

1. Brand new Napa battery (1 week or so old)
2. Trickle charged battery to full, reads 12.7 volts
3. With car ON engine RUNNING, battery reads 12.25 volts
4. Voltage drops the more accessories you turn on

Resolution Ideas:

Based on my research and the above info, I'm fairly confident it is a Voltage Regulator or Alternator issue.

I am not aware of a way to definitively test either of those at home so my plan is to pull the Alternator w/ Regulator and have it bench tested at Napa. Will that give me the data required to determine which is at fault?