How can I check the alternator of my Audi 80?

I suspect that my alternator is failing and causing intermittent electrical issues in my Audi 80. How can I perform a proper test to confirm my suspicion and what should I look for?

To test the alternator of your Audi 80, you will need a multimeter and access to the battery and alternator. First, start your car and let it idle. Next, connect the red lead of the multimeter to the positive terminal of the battery and the black lead to a good ground on the engine. The voltage reading should be around 13.8-14.5 volts. If it is lower, then your alternator may be failing.