So, I have been dealing with power window issue on my 01 f150 super crew. My left rear window will go up and down if I use switch on that door but will now work from my driver side master switch. I checked the wire to the rear motor and switch with test light which both receive power from the master switch but the motor does not go. I replaced the rear motor and relay. Don't think it is the switch since I do get power via test light. At a loss at this point. Any help would be greatly appreciated