Hey MisterT! I am a current Thor Tuscany owner and have been crawling around my rig for the last three days trying to diagnos a hydraulic slide issue. Come to find out it is the K1 and K2 relays on the chassis fuse board. I stumbled across your post regarding the replacement and your issue with the wipers. I couldn't help myself but laugh. I feel your pain and am in the midst of it. Anyway, I have a new board coming to me within the next day or so. My question to you is, did you just turn your chassis batteries off prior or did you have to fully disconnect them? thank you.