Its only on the left. The big rear window has a defroster, it is hooked up with wire lugs (not a plastic connector) on black and yellow wires. The same wire connectors on blk & yel are hanging out at the ceiling where they would connect to the side windows, but those windows don't have the defrosters. I wonder if that is not "normal"? Maybe I can ask my wife to find my DVM and bring the tractor closer to the house and I could see if/when it is energized. It would be fun just to sit in it. Brand new (to me) and I can't do anything, so frustrating.