[Tigers] Wiper circuit question

[Andy Walker]

Hey, guys:

 

Can someone out there explain to me how the wiper circuit works on a Mk1A?
I'm having a hard time understanding how it works.  Both the switch and the
motor are grounded; I understand the motor being grounded, but I've never
seen a switch that was grounded.  Obviously, I'm a relative neophyte when it
comes to wiring, but I do have a basic understanding.except for this
circuit.  Can someone explain this to me?

 

Thanks much,

Andy Walker

Edmond, OK 

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