How To Test An Alternator? Using A Multimeter. The easiest way to test an alternator is by using a multimeter. If that’s a tool you have on hand, just follow these instructions: Turn off the engine.

A failing alternator can leave you stranded on the side of the road. Here’s how to make sure yours is working properly, with tips from an expert.

The first is to test your battery when the vehicle is at rest. Here, the multimeter should measure at least 12.2 volts. The second test is to measure battery voltage upon starting the ignition at ...