How can I check if the starter motor in my Audi 80 is faulty?

I've been experiencing some issues starting my Audi 80 and suspect it may be due to a faulty starter motor. How can I check and diagnose this issue?

First, you can try checking the battery to ensure it has sufficient charge. If the battery is okay, you can then try testing the starter motor by using a multimeter to measure its voltage and current. If the readings are significantly lower than the manufacturer's specifications, it is likely that the starter motor is faulty.

Another way to check the starter motor is to perform a voltage drop test. This involves measuring the voltage drop across different connections in the starter motor circuit. If the voltage drop is high, it is an indication of a faulty starter motor.