How can I troubleshoot a faulty alternator in an Audi 80?

My Audi 80's battery seems to be constantly draining, even after being replaced recently. I suspect the alternator may be faulty. How can I troubleshoot and potentially fix this issue?

First, you'll need to use a multimeter to check the voltage output of the alternator. If it's not within the recommended range, it's likely the alternator is the culprit. If it is within range, then there may be an issue with the wiring or connections. Also, check for any visible damage or wear on the alternator itself.

Another troubleshooting step is to disconnect the positive battery cable and start the car. If it stalls out or doesn't run at all, that indicates a faulty alternator. It's also a good idea to check and clean any corrosion on the battery terminals and cable connections.