windsheld wiper problems

I have a 2007 KSDP. Had the same type of problems many times over and probably worse. Was worked on about 5 or 6 times at various service centers beginning after the first time I ever turned them on.The coach was purchased brand new. It was worked on by Newmar at the factory and at rally's three times. Never worked very long. Finally after owning the coach for nearly five years they replaced the entire wiper system. Not sure about the motor, but all the linkage the arms and the blades. I now have wipers that work. I do not hold out any hope you will ever have working wipers unless you get the entire "system replaced like I did.