If you’ve never used a voltmeter to test electrical circuits on 12-volt farm equipment, cars or trucks, but wanted to learn, here’s how: Voltmeters cost from $15 to $300. $50 will buy an economy-grade ...

A lot of farmers buy a voltmeter but never gain confidence in how to use it. Here are the basics: Plug the red test lead into the “positive” test port. Plug the black test lead into the ...