I remember driving a late 90's GM pick up that had the same problem. It was the connection between the motor and harness. If it was moved around or a large bump was hit the wipers would activate for on rotation then stop again. I solved it by folding a piece of paper and wedging it between the two connectors. It worked because the connection was just worn out. I know, the worst handy man fix possible but when you are standing outside in a down pour on a very busy highway that is 110 km/hr posted limit you get things done as quick as you can. What was worse was that the remedy worked for months and the problem wasn't fixed before I left the job, and the work truck forever. <img src="/forums/images/graemlins/lol.gif" alt="" />