Got2Gnow you are welcome. I just looked at you new schematic, you did what I suggested. But, I see a possible flaw in the working. What happens when you have the high switch closed and the you change the DPDT switch to park. I think it would park using the high speed. You would have to make sure to turn off high and then change from low to park. Or another possible fix to this would be to supply the +12vdc to the run terminal of the parking mechanism from that same NC contact on the high speed relay. I do not remember exactly how the 2-speed motors park. Do you know the exact action of the park mechanism. If you do not find out I would remove the wiper arms from the pivots and try the system out.
Ron