To use the DUOYI DY18 Automotive Electrical Open&Short Finder Circuit Tester, follow these steps:
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Connect the red clip to the positive terminal of the vehicle's battery.
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Connect the black clip to the negative terminal of the vehicle's battery.
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Connect the auxiliary ground lead to one side of the wire you want to test.
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Touch the probe tip to the other side of the wire.
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If continuity is present, the LED will light up green.
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If the LED does not light up, it means there is no continuity present.
Note that when using the DY18, you should ensure that the vehicle is not running and all related fuses are removed to prevent electrical shock or damage to the tester. Additionally, make sure that the connections are secure and the tester is used only for its intended purposes.