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.

It doesn’t matter if it’s a $30 discount store special or a $1,000 Snap-on multimeter with 25 functions, a multimeter will come with two electrical leads. One is black.

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Once you have the multimeter, or multitester, or volt-ohm meter (call it what you want), you will mainly only use two functions: volts (V or I) or ohms (O). If it is in the Jeep and wired up, test ...

With this guide, you'll learn the ins and outs of troubleshooting your home and household electronics using a handy multimeter.