It has happened to me twice now. The truck will be running and I go to switch on the A/C and then it stalls. After it stalls, I have to jiggle the keys in the ignition for a minute and then she starts back up. I have had my battery and alt checked and everything is fine and the volmeter was reading 14 right before it happened last. Could this be a bad ignition switch? This is on a `82 K5.