If you have a two-contact switch, connect a volt/Ohm meter to the two poles of the switch at the motor connector, and there should be no continuity. Depressing and lifting the switch with the key off or the switch disconnected from the wiring harness should both provide continuity between the two contacts. If the switch is connected to the wiring harness, it should provide 12 v (+/-) through the two contacts when the switch is depressed or raised, depending on the polarity of the volt/Ohm meter. If you don't have a two-pole (two connector) switch, then it is not a type I'm familiar with.
Note edits.