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I have a 2000 gmc sonoma and my head lights won't turn on all the bulbs are good fuses are good I checked the grounds seem to be putting off good ground the head light plugs however are is a 2 pin connector and I am getting 2 negative readings instead if a positive and negative

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Check the power to the light switch.. And also check wire continuity. Are the lights also automatically controlled by ambient light sensor?

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