11. With the wiring routed, the switch can be mounted into the door shell followed by the power regulator. The regulator comes with its own 10mm retaining bolts, so you’ll need to break out the metric sockets for this part of the install. Temporarily connect the two ground wires and two power wires to a battery or charger and check the window operation. If the switch is reversed, remove the switch from the door and swap the blue and black wires from the window motor at the switch. When everything works as they should, tackle the other front door before moving to the rears.