Thanks to all that commented. It was very helpful. With the added information, it appears that my lead identification is right, except the lead I thought was for use in connection with a washer is identified for use as switch (live) power in those uses where the low and high speed settings create a ground through the wiper switch. That is not the case on the jd 4240. The low and high speed leads are live and they were all that was needed with the original motor that had the park internally wired within the motor. The original third wire was a ground to insure continuity between the motor and the rotary switch circuit breaker to make sure the motor did not burn up if the wiper was froze to the window etc. I also know that if I provide the "switch" lead with electricity (not through the rotary switch), the wiper will run as long as there is supplied power. The park lead will operate as expected in that if power supplied the motor will run until it reaches the park position.
The original 3 lead motor was discontinued in 2012 and substituted with the 5 lead motor I have. The substituted wiper motor also refers to a new wiring harness, and as TX Jim has pointed out newer diagrams show a 4 wire lead. I am guessing the 4th wire is for the park wire that was previously wired internally in the motor.
So I need to find out how the newer substituted motor is to be wired.
There is still a chance somebody on here will have been there and done that.
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