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Q: If i turn my a/c on while driving the battery light comes on ,why? on 2007 Toyota Camry

when i use the a/c when driving it sucks all the juice out of the battery, and after replacing one battery,I used the a/c again and it started draining the new battery, so after charging the battery back to 100% and putting it back in the car i have been driving with no a/c on and the battery light has stayed there any way that there's something wrong with the a/c system and not the alternator?
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Possible drive belt system problem! Any squealing noises with AC on? Need to know alt. output voltage.
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