ive installed one of those deals from whitney for a fellow who brought it into my shop, and wouldnt take no for an answer... what a joke! it worked, but what an aborted monster it was! if i recall, ( it has been a couple years) you get the grid, which you cut to width, and wrap the ends of the filament wires around a positive and a negative conductor. one goes to ground and the other to a switch. maybe one of the hot air defroster types mounted under the package tray ducted up onto the window?