Thanks Brandon, I checked the motor, etc. and nothing had moved. The wipers work normally from top to bottom of the range of movement. But when turned off the wipers go right to the bottom, then return half way up the windshield and then stop.
I did an unconventional fix, that I just got lucky on, on the first try. (If my car had less rust, I probably would have worked a little harder to fix the problem properlythe black/violet wire near theewall connector. Doing this caused the delay wiper feature to be disabled, but when the wiper switch is turned to "Off", the wiper motor stops instantly. So you just have to get the timing down. If the correct fix turns up, then I can easily reconnect the black/violet wire.
Hope this helps someone else.