The dash has no power?

2018 CHEVROLET IMPALA
86,000 MILES • 3.6L • 6 CYL • 2WD • AUTOMATIC
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CALI4610
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Driver headlight, driver taillight, and whole dash (gauges, radio, ac-heater, none of it) has power. I’ve checked fuses and relays; they are all good. I’ve used a multimeter and determined the driver headlight connection is not good. I’ve tried tracing the ground and can’t find it. Chevy wants to charge $400-some-odd dollars for a wiring diagram. If all these things share a ground, couldn’t I just run a new ground from a new headlight connector and that be it? What do I do? :(
Jul 5, 2025 at 8:13 PM
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CARADIODOC
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GM is well-known for designing grossly over-complicated head light circuits for a long time. I try to avoid them, but here is the diagram that may help you.

Normally I never allowed my students to "just run a new wire", especially to replace a shorted one, because they don't know what caused the problem or if it will affect other wires in the harness, later. We want to know the cause and correct it. In your case, where there's a break, and if the location is rather hard to get to, adding a new wire might not be such a bad choice.

It looks like G101 is the ground you're after. The location is shown in the second drawing.
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Jul 5, 2025 at 8:50 PM
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CALI4610
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That looks like it’s right to the right of the left headlight assembly, is that correct?
Jul 6, 2025 at 11:54 AM
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CALI4610
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I got it figured out thanks to you! Come to find out it was the connector! I bought one the other day but figured it was more complicated! Thank you for your help! Saved me and my family a lot of money the week before my daughter's birthday.
Jul 6, 2025 at 10:57 PM
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CARADIODOC
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Very happy to hear you solved it. Was a terminal corroded off?
Jul 7, 2025 at 2:31 PM
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CALI4610
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Yes, and it was the g101 grounding just like you had predicted. Very good advice. I truly appreciate your help.
Jul 8, 2025 at 7:31 AM
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CARADIODOC
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Wonderful. Please come back to see us again.
Jul 8, 2025 at 11:22 AM