72 Skylark wipers won’t shut off

I assume you move the switch to off and they keep running? Defective on-off switch? Unplug the wiper motor until the problem is resolved.
 
Agreed, been a long time since I looked at one, but I believe if you take it apart there is a cam and ball deep in it, and the ball is worn and causing it not to stroke far enough or something to that effect...

Your "new" motor must be a rebuild or something?
 
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