Work truck...Chevy.

OK you gurus after you get over the fact that it's a chevy i need your help. Yesterday i was coming home from an auction and i was very dry. Pulled into a Mini Mart to get a 6 pack. Shut the truck off and went in and came back out and turn the key on. It turned over very slightly then nothing. Heres the funny part. When you turn the key on in a normal situation the guages do their thing by going back and forth till they settle down and stabilize but nothing. No movement on any guage and no turning over...BUT... the radio works, the heater fans works, and the headlite works. The battery must be good or the radio wouldn't work? Plenty of battery but nothing on the dash. Need some input before i start in on it. Thanks guys as i know someone here has the answer. I'll check back in a couple of hrs.
Small Block