Drove the truck yesterday for about 300 miles round trip. No problems. Today I started it and moved about thirty feet to was it and let it run while doing it. After washing, I moved it back into its spot and rolled the windows down and shut it off. A few hrs later, I put key in and turned it to on to put windows up and nothing happened, I tried to start it and it did nothing also mm3 would not power up and display in the dash is black. Disconnected the batteries for an hour and still the same thing. Batteries are both at 12.30. Help?