Wiper Motor Switch Schematic Doesn't Agree w/the Physical Part? 68 Dart

That switch is used in 67 cuda as well. Here's pic of factory schematic for 67 cuda. For our cuda, it is a white wire that goes in the "empty spot". It is for backup lights
Thanks! Do you have any idea what the lone spade is for?

I found this hand-scribbled schematic online and they wrote NC next to it. That could mean Normally Closed, but it could also mean Not Connected.

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