Now make the wire connections inside the housing. I soldered mine and put shrink tube to minimize corrosion. then cable tie them down somewhere in the housing to keep them from working their way out between the glass and housing.
Now reinstall the mirror on the truck. Pull the loose end of the wire thru the hole in the door where the mirror control plug fits in. Sorry, no picture but if you got this far that one is easy.
Next, loosen the door panel, remove the screw behind the handle and the two screws at the bottom of the panel. Lift up and out along the inner edge of the panel closest to the hinges. You don't need to remove the panel, only loosen it enough to get behind the top 12".
Now pop both ends of the rubber tube that encloses the wires as they run between the truck body and door. The one on the door will pry out with a screwdriver. The body side is a little harder. It is held on with 4 plastic tabs. If you push on each corner (it's actually marked on the rubber), they will pop out.
You will need to disconnect both white and black plugs. There isn't much slack to do this.
Now use a stiff wire and fish it thru the plug end of the tube and into the door and then up thru a hole behind the panel. There is an unused one up near where the top door panel clip attaches. Make sure it won't be pinched by any clips. Hook the wire and pull it all the way back thru the tube and out at the plugs.
Now in front of where the tube attaches to the body there is a small grommet which needs to be removed. Use a pair of needle nose pliers. Poke a small hole in the center.
Use the stiff wire to fish around the hole with the black and white plugs and come out the grommet hole. Push the wires thru the back of the grommet in the hole you made and reinsert the grommet. Reinstall both ends of the rubber tube, reclip the door panel and replace all the screws.