How do I tell if my Audi 80's alternator is bad?

I've been experiencing some electrical issues with my Audi 80 and I suspect it may be due to a faulty alternator. How can I properly diagnose this issue and what steps should I take to fix it?

One way to tell if your alternator is bad is to perform a voltage test on your battery. If it reads below 12.6 volts, it could be an indication of a failing alternator.

Another sign of a bad alternator is dim headlights or dashboard lights. This is because the alternator is responsible for powering these components.