Okay, I'm installing a new alarm in my 99 GMC C3500 C&C dually and I'd planned to use the existing door pin switches for the alarm triggers since these trucks are a PITA to add pin switches to. Even GMC didn't try putting them in the frame, instead they mount on the ends of the dashboard. So, I have what I thought was the full set of wiring diagrams for the truck, except they don't show that little detail. They do show the interior illumination control module, but not what wires hook up to it, or what they're for. I'd rather not have to rip the dash apart to see what wires (colors) are on the switches, and you can't get to them from underneath due to the parking brake on one side and the HVAC on the other side. And I can't just hook up to the dome light because the interior illumination module controls that with a delay after you close the door, and an override button (that I use) on the dash to keep the dome light off when the door is open. Anyone know either what the wire colors are on the switches (and if they switch ground or hot), or an easy way to get the switches out so I can see the wires myself?