Thanks for the prompt replies, I have a tin top so I don't think that will retract in a hurry and the rear window is clear.
This car spent most of its life in and around Las Vegas. It has factory air, only under the dash is still there though, at least it appears to be. I have been trying to find out any info about the vac. lines under the dash and the controls.
It's a great adventure tracking down and identifying components on a classic like the Challenger.
I will check out the back of the switch tomorrow and try to trace the wires however the wipers are a higher priority.
David