I could not remove all the harnesses that was used in my truck. One is attached to the reefer unit and after I disconnected it, the reefer would not start and there is this really thick cable that is actually bolted to the sleeper frame and snakes to the front of the truck and I have no idea where it goes to but hooked up to the QC unit under the bunk.
The other thing that I found odd was the unit was just mounted to the floor without a mounting bracket, just bolted to the floor. So when I turned it in, I told them about it but I think it went over their head.