Power Window issue in an 84

[peresich]

Some of you may remember my recent struggles with the transmission on my 85 C10. Well, after replacing the shredded governor gear, the flimsy rubber tube that was being used for the vacuum line, the vacuum modulator, and putting an actual TH350 dipstick tube on it instead of some random piece of plumbing from the local hardware store the truck drove for approximately 15 minutes before the internals of the transmission decided they were tired too. It's now sitting in my garage waiting on me to decide that I want to drop the transmission and do a rebuild.

On the bright side, my wife is awesome and she found a very nice 84 C10 that has already been partially restored and had an engine swap done on it. It runs and drives great and I am loving it. I am having an issue with the power windows though. Initially, they worked but the driver side moved slowly. Then, it stopped about halfway up and the passenger side would still go up down completely with the switch on the passenger door, but not with the driver side switch. Now, the passenger side will not move at all either.

I spent the weekend working on the driver side. I started by checking the voltage at the switch and I am getting plenty of juice at the switch and at the plug to the motor. I pulled the switch off of the 85 and swapped it to the 84 and noticed that the motor sounded like it tried to run and then stopped when I hit the switch to roll the window up.

After more inspection, and more cuts and scrapes and unpleasant words about Chevy engineers having freakishly small arms to fit inside the access holes in the door panel, I found that the lower regulator assembly arm was not on the rail anymore. I put that all back in place and rebolted everything back down and tried the switch again. I got the same sound but no significant movement out of the window. However, I could move the window up manually if I pushed the switch up so it felt like the motor was freed up enough to move.

I know that it is hard to diagnose things like this without being able to see them yourself, but is there anything in this tail of window woe that sounds familiar? I would prefer to not have to swap the entire motor/modulator from the 85 if I can avoid it, but that is looking like my next step if I don't come up with anything else.