wartrace

My truck (2003 Chevy Silverado) has developed a problem. My dashboard warning lights started randomly lighting up yesterday while I was driving. Today all of them (ABS, Brake,Battery, Anti-theft and airbag) are staying on most of the time. I also notice the gas gauge is at "empty". When all the lights are on my air conditioner does not work. If the lights cut off for a second it starts blowing cold air. It almost seems as if the truck doesn't know its running. I have no performance issue when the lights are on. Any ideas? Some have suggested a grounding problem. I suspect maybe it's the ignition? Any help would be greatly appreciated.