This video covers the essential steps to properly test a car's alternator and diagnose common alternator issues. The guide demonstrates how to check the voltage regulator, diode rectifier, stator, and ...

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.

A failing battery might seem straight forward to spot, but a failing alternator can be a little more difficult to identify without knowing its voltage output.

The voltage output of an alternator is controlled by the voltage regulator, and usually stays between a constant 13-1/2 to 14-1/2 volts.

You may opt for a solid-state voltage regulator, which works quite well—that is if your alternator is delivering a solid 14-15 volts and all diodes are in working order.