Another drivers window issue! 01 x5

[x5newbie01]

Picked up an x5 for a steal and the only issue was that the drivers window was stuck down and there was no response from the switch. I opened the door panel and found that one of the clips for the window broke (go figure) and the window wedged itself. I ended up having to cut the regulator cable to release tension since it wouldn't budge. I replaced the regulator and motor along with the clips. I plugged it in to make sure everything was working and it wouldn't move. I tried using the key in the door to get some kind of movement and nothing. Everything works on the switch except the drivers window. I was able to use the power source at the switch and a ground to roll up and down the window so I know the motor is fine. I also went to the junk yard and tried another switch. The junkyard switch made a clicking sound however kind of like how a relay sounds. Checked also the fuses in the glove box.
What am I missing? To me it seems like the switch and I know it's possible that the junkyard one was faulty as well. Any other recommendations? Thanks!

[Porando]

Have voltmeter and know how to measure voltage on input and output to motor?
If you do - you will know what to do - if you don't know - take it to a pro to test.

[x5newbie01]

Thanks. I started at the connection from the door harness in the jamb and found corrosion and had almost eaten through a few pins. They were very flimsy so I think I found the culprit.