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Charging system for 04 RX8

My "check charging sytem" message went on couple days ago. I had the alternator changed and battery tested. The battery was fine and the new alternator still didnt charge it up as the "check charging system" message still came up. What else could it be? Tried to jump start the battery but didnt last as it was completely emptied and all the lights on the panel lit up.
What could be the issue here?

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