I had this problem with an electric wiper kit and had to loosen the little set screw that held the linkage attachment on the shaft of the motor.
Took a few times moving it a little bit at a time to get it working in the right direction.
I left the linkage unhooked and would turn the wiper motor off, and let it go to the park position. Then would loosen the little set screw on the motor so I could turn the link attachment to the position I thought would work best. Took a few minutes experimenting with it to get it right.
