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Is the test light supposed to light up when you use the ground from the battery or only light up from the positive side?
Wiki User
∙ 13y ago
If the alligator clip from the test light is attached to the negative post of the battery it will light up whenever the probe end touches a positively charged circuit and likewise if the alligator clip is attached to the positive terminal of the battery the test light will light up when the probe end touches a negatively charged circuit
Wiki User
∙ 13y ago
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