Tailgate window won't roll up or down

[496truck]

It sounds like you found your problem but one thing to note and may be worth checking while you have it apart, just cause you read 12v at the connector does not mean it is good voltage that can carry enough amperage to spin the motor. There are a couple splice connections in the harness in the tailgate that are sealed with electrical tape from the factory. I found mine were all green and corroded and had to cut and resplice those connections to get proper power supply to the motor.

Also note the motor grounds through the tailgate hinges. If the hinges are rusty this can hinder the operation similar to the power supply side (bad ground). A simple fix for the ground is running a ground wire from the gate to the body or frame.

 

[4x4chvy]

Thanks for this. It's been working in mine for 5 years now

 

[heavy_k5]

tailgate stuck down

hey fellas new to the form. but i have a 85 k5 and my rear window is stuck down. pulled the cover off of it to see what i could see and the cable has come out of the gear box. dont ask me how it happend. lol but trying to get it back up but just dont know how. can anyone help me? oh and its not the part i use for the drill. its the other end. under the glass.

 

[rampage]

Came out of the window motor (on driver's side) or the window transmission (on passenger side). If it came out of the transmission it'll be more of a problem. If it came out of the motor it should just screw back in. Or if it doesn't you can hook the cable to a drill and raise it that way.

See if this post helps that was just asked a couple days ago:
http://coloradok5.com/forums/showthread.php?t=318989

 

[rampage]

After your edit ...
You'll need to unbolt the glass and slide it out then. I think it's four bolts along the bottom. May want a helper and to help support the glass while you're maneuvering it out of the gate since it's heavy and could break.

 

[heavy_k5]

Thanks man. Im going to try it tomorrow.