How to troubleshoot a faulty alternator in an Audi 80?

I am having issues with my car's alternator and my Audi 80 is not starting. What could be the possible reasons for this and how can I fix it?

First, check the battery voltage and connections. If they are good, move on to inspect the alternator belt. If the belt is loose or worn out, it could be the cause of the issue.

Another possibility is that the alternator is not charging due to a faulty voltage regulator. You can test this by using a multimeter to check the voltage output from the alternator.