I think there is a way to turn off your auto lights. Now don't quote me but it SHOULD work. I have no idea what it is though :-/ If anyone has a 99-2002 silverado check the owners manual. There is a sequence with the headlight switch and the ignition key that will disable the auto on headlights. Now this will probably only work on 99 and up Gp's but it should work since they are essentially the same systems. Somebody do some diggin.
p.s. to the o.p. I'm totally from Mason City Ia too.. word