Not to cloud the issue too much, but on my Ranger the switch wasn't the
problem.  Mine was the wiper motor itself.  There's a doohicky (for lack of
a better technical term) inside the motor casing on my truck that controls
parking and delay.  If you rap on mine with a hammer while running the
wipers it will work.

Thought I'd toss this out there since it was another Fomoco.