Audi A5 alternator problem

Hello,

this week i was driven when a alternator light switch on, and i take the car to my mechanic and he told me that the alternator is bad and he needs to take it to an can electrician ,finally he give me back my car bac the electrics starting acting strange like the from cluster stating switching off the windows wound go down. and found 14 problems that i reset all of them, now i have to take back the car to the electrician to see whats wrong with it any one had the same issue with the audi a5 2014?can someone tell whats the problem with my car i check the ,I tested the voltage and found it 15.68v is this voltage to high ? the car was running  at that voltage, when the car is off all works fine just when the car is running is the issues starts, thanks for any help you can provide

King regards

Anthony

All the very best wishes to all