1999 GMC Sierra electrical

This is almost impossible to walk you through online. Something didnt get hooked up along the line here. Or a wire is pinched. Did u remove the steering column, or cheat, and let it rest on driver seat? I ask only becuase to remove the column, you need to disconnect 2, or 3 harnesses to the column. 1 I believe is on the circuit for brake lights. Its been a couple years since the last one I done, but I am almost positive this happened to me, and it was a simple fix. Left something unplugged under driver side of the dash.