The test light method is traditionally used to test if power is present. Simple test lights only need a clean ground to connect to, while some multi-functional models may also need a power hookup ...

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.

Learning how to test glow plugs ensures your diesel engine remains reliable and efficient. Here is how to test glow plugs.