I have an 87 944 that I'm working out some bugs with. The passenger side window is dead. I have changed the power window relay, the window motor and regulator (used) but good, changed power window switches on both sides and still nothing. I used clarks garage and took a test light and checked the pins on the harness for the switch on the pass side I have power on one side but the other side has nothing. Someone has definitely been in there before as I have a solid blue wire and a blue and black wire that looks like it goes in to the power window switch but is just hanging there. I also checked for power on the motor and there is nothing. I also found a long narrow light brown plug in the door that is not plugged to any thing, what is that

The drivers window works perfect. Now....when I try to roll down the pass window from the drivers side if I hold the button down it pops the fuse for the power windows. Please help.
James