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.

For automotive circuits, we recommend an auto-ranging meter with at least 20MΩ of internal resistance. Make sure to use the correct multimeter setting for a car battery.

When your car doesn’t start, often the battery is the culprit. Unfortunately, most vehicle owners do not check their battery until it fails. As preventative maintenance, the suggested best practice is ...

Disconnecting the battery while the engine is running isn’t a valid test for alternator function and may damage sensitive electronic parts. Instead, use a common voltmeter and the following test ...