Testing relays and their circuits in vehicles doesn’t always require a trip to the bench. With a few simple tools and knowledge, this video shows how to test relays directly in your car using a test ...

Want to know how to use a multimeter properly? Here are five common ways to put your digital multimeter to good use. Note: These instructions are applicable to most multimeters.

For all of you who have a multimeter thrown in a drawer or toolbox but don’t know how to use it, these instructions will help in your search for missing voltage.

This video covers the essential steps to properly test a car's alternator and diagnose common alternator issues. The guide ...

Car batteries don't just die. Something is sucking up all its power. A parasitic draw test helps you find out which part is to blame.