What is the problem? Please Help!!

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For one month now, the battery light comes on and the car is shifting from 1st to 3rd gear, skipping 2nd gear and not going into 4th. Alternator was replaced,and I was told that there was an open circuit that was draining the Alternator. Car's Audio system was disconnected at the Dealer's repair shop. Car is experiencing the same problem, before any repairs were done.