How do you check to see if alternator is charging?

To check if the alternator is charging, start by using a multimeter to measure the voltage at the battery terminals with the engine off; it should read around 12.6 volts. Next, start the engine and measure the voltage again; it should increase to between 13.7 and 14.7 volts if the alternator is working properly. Additionally, you can observe the battery warning light on the dashboard; if it remains illuminated while the engine is running, it may indicate a charging issue.