I have a 1965 C10 that the wiring was butchered up when I bought it. It had some other vehicle power steering column in it, maybe an Impala. The column turn signal system was not hooked up, instead they used one of those aftermarket hang on the column units.
I purchased and installed a keyless flaming river tilt column for my TH350 trans. I've had a ton of wiring issues trying to get the lights to work correctly. I've followed the trucks wiring diagram and even drawn out just the circuits I'm working with to try and understand how everything works.

So, my question at this point is about the light switch. When I pull the with out one notch, I have power on the purple wire and the front running lights are on, but not the rear. From what I can tell, the rear running lights would get power from the brown wire on the light switch. Should I have power on the brown wire when I pull out one notch, or even two notches? If it should have power, what wire does the power into the switch come in on?

For informational purposes, I have correctly rewired the rear tail light harness and front running, turn and headlight harness as well as the engine harness. I'm okay with wiring as long as it's A, B, C, just really bad at troubleshooting. Thanks for any help. I've been working to get the ol girl on the road for almost a year and I'm so close, and so frustrated.