Power to the rear window

[mr_dude]

Hey, anyone have a wiring diagram for a 90?

My tail gate window works from the key hole, and it appears 12v for down, -12v for up (or the opposite, can't remember).

But the switch in the cab doesn't work. It has a couple of 12v lines in, but they don't do anything. Am I missing -12 volts from the fuse box or is it something else?

 

[CMiYC]

Its more likely the switch simply inverts the + and - connection to get -12v. It wouldn't make sense to provide a -12v supply line. So having just +12 at the switch is probably correct. (I could easily be wrong, but I could just as easily see not having a -12v line.)