2008 Silverado 1500 manual windows and door locks. Truck was parked for about a year and a half. No issues other than it needed new tires. I was driving a company vehicle and didnt need the truck. When I got it back on the road it would delay shift from 2-3. Multiple dash warning lights on. Airbag, abs, door ajar. Shifting even worse when headlights on. I have read everything from ignition switch to ground wires to door sensor. I have checked wires for bare spots, cleaned up terminals and connectors have checked fuses. Can anyone tell me a good step by step check list.