How to check if an Audi A2's alternator needs to be replaced?

I'm experiencing electrical issues with my Audi A2 and was wondering how to determine if the alternator is the problem. Any help is appreciated!

To determine if your Audi A2's alternator needs to be replaced, conduct a simple voltage test. Start the car and measure the voltage at the battery terminals with a multimeter. If the reading is lower than 13.8 volts, it's a sign that the alternator may not be charging properly. It's best to have a professional mechanic inspect and for any necessary replacements.