My rear window defroster has never worked since I bought my 84 GW back in October of '16. While it is at the painters, I was thinking of items to work on when I get it back. I took everything off, so I will be opening back up the rear window panel anyway to put back some parts. As I look at the TSM, it appears to be yet another vacuum operated item on the Jeep... am I getting this right? When I turn the switch on, the green light comes on, but no heat to the window. I was hoping for a simple "Change the wiring harness/fuse" kind of thing.
Still reading but any help would be appreciated.