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It's a must-have for any toolbox—but there's a learning curve involved. Learn how to use a multimeter for all of your electrical testing needs.

Set up the multimeter by connecting the black lead to the COM port and the red one to the port next to it (usually labeled with a combination of Volt, ohm, and milliampere symbols).

Multimeters can help you diagnose issues with appliances by measuring voltage to components, as well as the continuity of and resistance to currents.

With the F1 and F2 (if provided) field terminals isolated, measure for a resistance of approximately 4 to 8 ohms or 8 to 12 ohms depending on whether it’s a 12- or 24-volt system (respectively).

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