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I would suspect that your alternator and ac run off the same belt (serpentine belt). When you run the ac, it causes the belt to run a little slower, and therefore causes the alternator to not put out as much voltage as it needs to in order to keep the battery charged. However, if this is the case, it is because the alternator is going bad. The ac shouldn't affect the engine speed to the point where the alternator doesn't function-- if this were the case then the engine would die. It must be that the alternator needs to be kept at fairy high rpms to produce necessary voltage. Get it tested and if it's bad, replace it or have it rebuilt at a shop.

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Q: Why does my battery die when I run the AC?
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