Today I ran the car in the garage/shop and once it was up to temp, the voltage was at 14-15 at idle. I turned on the headlights and it momentarily dropped to below 13, then went back to the 14 range. I pressed the brake pedal and it dropped to around 12 and stayed there. I'm surprised that the brake lights seemed to draw more power than the headlights. Regardless, the voltage output seemed okay as compared to how it was a few days ago. It increases nicely once I am over 1500-1600 rpms. Maybe I don't need a new alternator. The A/C crank pulley I'll be using is a 7 1/4" unit, the current NON A/C pulley is a 6 1/2". The larger pulley is about 11.5% bigger, making the alternator turn faster. That should help it at idle.