Just happened to notice when leaving the post office that my right front blinker is not only not blinking, it is hanging by the wires as I’m driving down the road.  Sigh.  This is what can happen when you buy NOS (new old stock) items that are rubberized & have been sitting on a shelf for about 30 years.  The rubber dries out from sitting (just like tires do) and once it starts getting bounced around & vibrated from the bike being driven it slowly cracks and then simply breaks one day.