u/Ok-Big-3386

Just got this 2014 Ford Edge Sel last week with 110,000 miles on it and already in the shop. Check charging system light came on and when I took it to auto zone, was told it looks like a bad alternator. So I took it to the mechanic and the alternator tested 12v, so replaced. When he went to test drive the car, same issue. Tested the alternator that he put in and tested at 12v. Says he tested the batteries and they both are good. So I have to wait for the electrical guy to get there on Monday to look at it. What may be the problem? He also said the fuses were good? Anyone else have this problem with this car?????