1990 K-5 4wd with a rear window that wont go up. I have replaced the motor in the tailgate, and when I push the switch the window will sound like it goes down but not up. I was told that the dash switch should be replaced. Does anyone have any experience in this area? Thanks!

Jeff

 

If you hotwire the motor, will it go up then?

*Moving to Fullsize Tech*

 

You may have a faulty switch in the rear panel. If you open the tailgate and remove the latches there should be a switch on each side. These switches (if I recall correctly) are supposed to prevent the window from going up if the latch is open. You should be able to jumper the connectors to bypass the switch as a test to see if the window will now go up.
You can do this with the tailgate open.

http://lmctruck.com/icatalog/bzc/0025.aspmotor cutout switch #22

I don't know for sure, but I have a hunch....

 

Thank you, for the words and the link. I will let you know what happens.

Jeff