Well I can't say that I have seen this issue before, the best advice I can give you is to download the service manual available on the form and dig in. Or use the search bar at the top of the Forum page and type in wiper problems. I know there have been other posts concerning issues with the wipers but not that particular one that I can remember. Or you can save all of that and just send a private message to 180, he's been on here since before Methuselah came out of diapers 😁