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How brightly the bulb glows corresponds to the voltage that arrives at the terminals located on the back of the light. Usually, a 12-volt battery is the source of this electrical power, and a switch is used to activate or cut off that power. By checking the voltage coming from the power source as well as the voltage reaching the bulb's terminals, you can figure out whether the 12-volt light is in working order or faulty.",[48,49,51],"h2",{"id":50},"step-1","Step 1",[31,53,54],{},"Plug the red test lead into the voltmeter port labeled \"volt.\" Put the black test lead into the port marked \"com\" and make sure it is secure. Rotate the main dial on the front of the voltmeter to the \"DC volt\" setting.",[48,56,58],{"id":57},"step-2","Step 2",[31,60,61],{},"Bring the red probe of the voltmeter into contact with the positive (+) terminal of the 12-volt battery. Then press the black probe against the negative (-) terminal of the battery. 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