Car batteries supply and store the electricity used in your vehicle. It can be frustrating to find out your vehicle's battery has failed as you’ll likely be unable to start the engine. Unlike far ...

A multimeter and its test leads allow electrical workers to reach into an energized panel, touch live circuit components with the end of the test leads, and capture electrical readings like voltage, ...

Learn how to test a transformer: insulation resistance, TTR, winding resistance, polarity, continuity, and dielectric checks.

The Harbor Freight MADDOX back-probe kit lets DIYers test automotive sensors safely. Just insert between wire and insulation, ...