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4 Using a test light is a simple way to verify if a circuit has power or ground, simply by connecting the alligator clamp end of the lead to a known power or ground source (usually the battery), and probing the circuit with the end of the test light. If the test light illuminates, you have power or ground (depending upon which terminal the lead is clamped to). For more sensitive circuits, such as EFI computers, it’s better to use the aforementioned DVOM to check for voltage or ground signals. View Related Article
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