OK. 2005 F150 Super Crew Lariat.
Rear Driver Side window issue. Button from Master Switch does not work at all. Switch in rear driver door will go down but not up.
I have installed NEW master switch, rear door switch, motor and regulator. Still no fix. Checked all fuse/relay. All other windows work fine.
I pulled the boots to check wiring but can't see much so hard to tell.

Ideas? How do I check with a volt meter? Any help before I am forced to go to mechanic would be appreciated.

 

If the contacts are clean on the harness, then the issue is a broken wire in the door, jamb(s), or under the sill plate. I'm in the same boat.

 

Lets see if we can prompt someone to point you to a wiring diagram or post one for your use. Likely a broken wire or bad ground connection.
I did a 2005 Explorer last week and it had broken wires in driver door hinge area.