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If you have any lights at all you have power to the switch. the parking lamps and headlamps are on different circuits. It was expained to me that the "sweet spot" is just jumping from one circuit with power to the one that does not. If your switch has signs of melting and the fuses are good, you might want to use a test light to see if you are getting power to the back of the switch. if memory serves me, the large guage yellow is the power to the lights. look at all the wires for signs of damage or melting, or use the test light to see if you have power further back.
I always wondered why my friend Jeff always said I was the dumbest smart kid he ever knew.....DUH there wasn't even a fuse in it. I have no freaking clue when it would have been removed, but I put a new 15 amp fuse in it and WALA, the headlight switch works perfect. I guess maybe the terminals in the fuse block had relaxed enough to touch eachother....I dunno, but it isn't broken now, so I can drive it to work again
That's great. Electrical diagnostics can make you blow your fuse at times. you spend so much time trying to figure it out, it is easy to overlook the simplest of things. Don't feel bad, it happend to me and the fuse was the first thing I checked out.