Car voltage regulators are usually tested with a multimeter, which is clamped directly onto a car battery’s terminals. Find out why a car battery should have 12 volts with the car off with help from an auto mechanic in this free video on car repairs and mechanics. Expert: JB Hebert Contact: www.wrxtra.com Bio: JB Hebert is a machinist, metal fabricator, and auto mechanic who has been fixing and modifying all things mechanical for over 20 years. Filmmaker: David Pakman