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To use an auto circuit tester, first, ensure the vehicle is turned off and the circuit you want to test is accessible. Connect the tester's negative lead to a good ground, then touch the positive lead to the circuit or component you wish to check. If the circuit is functioning properly, the tester will indicate continuity or voltage through a light or sound signal. Always refer to the specific tester's manual for detailed instructions and safety precautions.

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3w ago

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