I am trying to get the last part to work on a long restoration on my 70 Challenger SE. The wipers will only go one speed and will not park. I have good grounds. The thing I am confused about is did Mopar make a flat style 2 speed motor? Are all flat style motors three speeds? I hear that a two speed switch will not with a three speed motor. I have never seen a Challenger with a the style motor that comes straight out. The motor is rebuilt and I have an old stock new two speed switch #2947404. Could there be another issue or do I need a three speed switch? Any help would be greatly appriecated.