Ford Wiring System - Automotive Electricity 101
Every enthusiast should have a digital volt/ohmmeter as well as a test light to help determine power and resistance in electrical circuits. A voltmeter measures voltage-whether you have power or not-and how much. An ohmmeter measures resistance to the flow of electricity, measured in ohms. These are the two most important functions. A test light tells us at a glance if we have power.
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