Okay, I'm testing the switch right now, but the one diagram describing these wires here in the faq is for GMC and does not seem to match Chevy trucks. I know obviously the red is power, the brown I believe should be the one to the tail lights, and the light blue I believe runs to the dimmer switch for the front headlights (its the only one with power when the knob is pulled fully out, and the headlights are the only lights that work, so makes sense) .
Here's how it read when I tested each line:
Red- continuous power
White- none
Light blue- Power when knob pulled all the way out
Drk green- none
Brown- none
purple-Power when knob pulled half-way out
orange- None
orange2- none
Lines with none had no power in any knob position.
visually, none of the dash/guage lights come on, the dome light will work, but the fuse for it will blow after a few seconds of use. headlights work, running lights do not.
I completely dissembled the running light switch and cleaned it out, polishing all the interior contacts (they didn't look that corroded actually).
Anyone care to help me figure this out?