fresh air blower, where's the hot lead? Options

[jr91472]

Didn't want to hijack and my issue is a little different so........

Can someone explain to me where the hot lead is located on the fresh air blower switch in the dash. All I can find is one red wire that goes into a small lamp socket next to the dash board lever.

I have three white wires (w/ stripes) that control the fan speed. Then one ground wire on top of the switch unit and another ground wire on the bottom.

This seems consistant with the wiring diagram, but I cannot figure out how this circuit works. The only place I can find 12v is if I pull the lamp socket out and probe at the end of the red wire. Once I put the lamp socket back in place, nothing. Is there some kind of contact inside the lamp socket?????

btw, the little light bulb is burned out, don't know if that matters or not.

thanks