Electrical Gremlins, Headlight switch related? Options

[scoobykvn]

I am having some issues with battery drain. When my battery is hooked up and headlights off, some of my gauge lights are still on. When I turn the lights on they swap (on turn off and off turn on). I tried another switch I have and it does the same thing. If I unhook the ground cable on the battery and leave the pos cable on, the gauge lights on previously are still getting a small amount of current (I can see a dim glow). If I unhook the blue and black wires from the headlight switch the lights go off. Anyone have any ideas?

[scoobykvn]

I have yet to find a loose ground connection or one the has paint or dirt on it. This is what I still dont understand; If I unplug the 2 sets of black/blue wires from the back of the headlight switch, the bulbs go dim. When I touch those 2 sets of wires together the bulb gets bright like it has full voltage. I assume if those wires are unplugged then the bulbs should have no power going to them. Are there any other ideas out there for me to check? I will have all day tomorrow to look into this. If it matters the wiring harness is from a '76 but it is in a '70. And would it matter if not all the wires are hooked up? like the side blinkers in the front, or the license plate lights, interior light switches in the door.