I have a '06 F-350 6.0 turbo diesel. A little while ago the driver side switch for the driver window stopped working when I tried to roll up the window. It started working again and became an intermittent issue. However today it just stopped working all together. The motor is good because I straight wired it and got it to roll up. The switch has continuity when it's depressed both up and down. Does anyone have any ideas or thoughts about how I should proceed with the troubleshooting process?? Thanks for your time.