Watched video. Mine has the stainless steel trim so I removed the torx crews around the inside liner of the door. I lifted the black control panel trim cover and removed the two wire attachments WITHOUT cutting the wires as suggested in the included instructions and the video. I unsnapped the old fuse and snapped in the new fuse. I then reattached the existing wire connectors.
So I did not add the included wire harness and it works fine. The original one lasted 11 years.