Hi All ~
I spent a good deal of the day solving problems with non-functioning power mirrors in an '87 Limited. The switch had been "fixed" before, leaving it with tape on the back and some of the wiring connectors just hanging there loose. Found diagrams for which wire colors go to which terminal for an '84 and for a Wagoneer, but neither had the same colors or were incorrect somehow. I'm attaching a graphic of where I ended up to mirrors working correctly and no blown fuse (get a large number of 10amp AGC fuses if you are experimenting with this). I did find the original back cover for the switch in the bottom of the door, not even broken. Once I verified the function of the switch, I added a little hot glue to each wire just behind the connector to take any strain off the tiny metal connectors. Before my final assembly, I gently recrimped each connector so it would grip the pin it slides onto, then used the hot glue, then put the cover on. I also slid a piece of shrink fit tubing over the existing plastic sleeve on the switch harness because the action of the window regulator had worn a hole in it. I wouldn't advise taking the switch apart unless you need to. It's one of those with tiny contacts that ride on tiny springs which like to fall and get lost on your garage floor.