Shortly after I bought my XD-11, I bought a clean used Winder D. Fortunately mine has worked flawlessly. Regarding the LED pilot light, the way it seems to work is as a monitor, sort of. It lights when film is being advanced and it lights and stays lit once the end of the roll has been reached. It will also light if, for some reason, the camera or winder gets jammed up during mid-roll.
68degrees, if I had your winder, I would solder a short extension onto the existing wire. Better to replace the entire wire, but if this isn't possible, then I'd just solder on the extension so I could get the winder back into service.