Set the dial of the multimeter to measure a 0-20 volts range DC, typically labeled with a "V⎓" symbol. As most American vehicles operate using a 12-volt system, this setup will allow for measurements ...
Auto-range multimeters automatically select the range of the values being tested. A manual range multimeter requires the user to select the range of the value being tested (200Ω, 20kΩ, 200kΩ, etc).