I purchased the rear light kit for my unit (B7327) it did not come with a description of the switch wireing plug location. All parts were detailed on the parts listing and installed in very little time as per the drawing. (except the switch wre plug) The switch mounts beside the rear window wiper switch. The problem was locating the electrical connection plug that is located inside the head liner. I would have thought that removing just the back holders I could see the plug (but NOOOOO0) it is actually taped to the top underside of the hood about 16 to 18 inches forward of the rear window on the RH side of the roof. I had to remove most of the headliner restraints to get at it. Once I did that, it simply plugs into the switch. Just wanted to let folks know that if you are looking for that wire connection on a B3000HSDCC that's where it is.