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Q: Electical Issue? on 2001 GMC Yukon Denali

I got the truck jumped at work today and started right up. On my way home the lights started flickering when I was using the electric windows. It drove fine. When I shut truck off, I put charger to battery and battery is fully charged. I opened the door to try to start again and NO electrical what so ever. No lights, No engine turn over, No auto locks, Nothing, Turn the key and get nothing.. Any ideas on this one?
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Check that the battery terminals are clean and tight, check the battery cables and the ignition switch.
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