[Excaliber]

For what it's worth,,, the switch, whatever one, actually switches "ground". At least it's that way on mine. The "hot" side is always on and goes directly to the wiper motor, so your "making a connection" to "ground" when the switch closes any wire to the ground wire terminal on the switch. That means you may or may not be able to actually find any voltage present at the switch with your volt meter.