Allis C model, positive or negative ground?

   / Allis C model, positive or negative ground? #12  
Won't the starter run backwards with the polarity reversed? That could give a clue.
 
   / Allis C model, positive or negative ground? #14  
Won't the starter run backwards with the polarity reversed? That could give a clue.
This one won't, but for clarity/future reference, if it's a permanent magnet starter motor as on a lot of smaller engines, they will. But of course 99.99% (I guess) of things that run with a starter with permanent magnets, are all negative ground.
 

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