I replaced the unit using the easy to follow video instructions. Because I did not need the adapter harness, all I had to do was loosen the two nut/screws holding the unit in. Unplug the old unit, plug in the new unit, hang the unit on the wall and tighten the screws. It took minutes
After waiting a couple of hours, it was still not making any ice. A little web searching, I found a post that said use a turkey baster to prime the unit. That did the trick, it has been making ice like a champ every since.