Put a digital meter on your battery and and start your car. I assume you now have a good alternator. Check the voltage reading on the meter with the engine running. The meter should read 13.5-15 volts on the DC scale. If it doesn't, pull one fuse at a time and keep watching the meter. When I say every fuse, one at a time I mean, pull the fuse then reinstall it ....every fuse, including power windows etc. This must be done with the car running if the DC is less than posted. You sound like your alternator is pulling down. Turn on your AC and watch the meter. Turn on devices one at a time. Your watching for something that is ON pulling on it or something that is OFF pulling it when it is running.
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