fan switch problems need help. (new wiring harness)

[white71chevy]

i bought a new wiring harness for my 71 c10 with factory air and the kit has almost everything but i can not find the wires that go to the blower motor switch on it. it has the wires for the blower resistor and the blower relay and when i fellow those wires back they don't go to the blower switch they just go back to the fuse block. its a painless harness and has been every straight forward about everything but this. i'm at a loss of what to do is there another harness i need to get because i have factory ac which to me wouldn't make sense seeing as how it has wires to hook up ac built into it. any help would be wonderful. thanks everyone.