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.

To test this, leave your multimeter on the ohms setting and measure the resistance between the switch pins. On a four-pin relay, these are typically labeled 87 and 30.

Multimeter Cost Multimeters are versatile mechanisms that can be leveraged beyond automotive applications. Even basic multimeters can measure voltage and current in household items such as switches, ...

Mark this wire. Use the multimeter’s continuity tester along with a scrap piece of wire that stretches between the two switch boxes to determine the two traveler wires.

Today on Boiler University's Weekly Boiler Tips, Jude goes over a really easy tip to determine if the air switch on the boiler's blower is working properly.