[dscott]

This may sound stupid but here goes. If the wiper switch is wired like in the manual and works properly except for parking the problem is sometimes that the motor is running to free and it runs past the parking stop on the motor gear. If you turn the motor in the mount to give it a little pressure it slows the motor down so it will park. If the problem is that the fuse is blowing, make sure you remove the blue wire from the back of the park switch on the motor and run it directly to ground.
Don