Yes, I too have this service manual and have carefully studied that wiring diagram....what i'am saying is that my car has been in parts for 40 years (restoration) and both the defogger motor and switch are the original set-up that came with the car, but like I said I had the defogger motor rebuilt when I sent it in to be rebuilt it had the provision for one wire not two as the diagram shows also the def. switch original to the car has two positions (but) there is only one wire that goes directly from the dash to the motor. However like mentioned 40 years has gone by of non use so I can't remember having used the defogger that much since it's only driven in the summer. Just want to know if there is others out there with (this) type of strange set-up.

Later, BUZZ