I think I'll try to document some things that need attention with this wagon. It came from L.A. but it wound up in the Sierra foothills in mud up to the frame.
The first job was to get the Magic Tailgate open. The mechanism was siezed, so I pulled the rollers off of it in order to push the glass down. Once I got the window release engaged it opened in both directions. Lots of rust back here.
Here it is after breaking off the crud and testing operation. The wires are +- for one direction, -+ for the other.
The windshield is cracked, so I'm removing chrome to get at it and underlying rust. Notice the longest piece of chrome ever put on a car sitting on the roof ?
Nice. Consider starting a build thread for it here - http://www.stationwagonforums.com/forums/forums/station-wagon-projects.32/
The 'Magic tailgate' should have opened like a door, if the RH latches had released, without having to drop the glass. So, check the lock mechanism and key cylinder.
The tailgate window channels are much like the ones on the doors, except they are part of the roof and back pillars. This prevents opening in any direction until the glass is mostly down. I know the next generation used a different style where that might work.
Hmmm...I knew there was a family when I was a kid, who had a similar wagon, but I recall the mom not dropping the window to open the T/G as a door. This would've been '70? '71?