Electrical problem
1998 Mitsubishi Mirage 4 cyl Two Wheel Drive Automatic

I had an oil leak...It caused the altenater to go out, so I had the altenater rebuilt. and I bought a brand new battery last week.. Today is dies out. I recharged the battery and the car starts. I take the baterry post off and the altenater is charging. Someone else tries to check my car and says it's not charging. I take the altenater out AGAIN and bring it to the shop. They say it's charging. Now my ac dont want to work and my stereo won't work too.. Is the altenater charging? Could it be a fuse? could it be my battery? Im standed...