Quote:
Originally Posted by rotorwrench
Flow is always from negative to positive. The flow through a conductor wire is predictable and can be manipulated by keeping it close the power source and sizing the wire for the least resistance. The ground path is less predictable about its resistance to the flow and the pathway is not as easy to manipulate.
Electric starters are what made the change with Ford. The flow is better from a source (the battery negative post) to the starter via a known resistance conductor cable with a know length of run. The bottom line is that the starter worked better with the positive ground arrangement than it did with a switched polarity. The rest of the system could care less.
When 12-volt came along, resistance of the conductor cable wasn't so much of a factor with twice the voltage to kick it through. When alternators came along, the diode life is a bit more reliable with negative ground so that sort of sealed the deal.
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Finally a Clear and correct explanation. Thank you!