Quote:
Originally Posted by rotorwrench
They used positive to earth for max electron flow in the direction it flows best. Henry changed over in the model T days to pos earth. The difference isn't a lot but 6-volt batteries need all the help they can get sometimes.
Most stuff in the old cars isn't all that polarity sensitive that it can't be changed. On later cars with solid state electronics, polarity can NOT be changed. It would fry some electronics. The old 6-volt radios will work either way as long as it still has an old vibrator for voltage step up. If it gets changed to a later solid state vibrator then reverse polarity will kill it.
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Electrons only flow one way in a DC circuit. I do not believe there is any difference in performance as to which way current flows through the starter or any other device except the coil, which is polarity sensitive.