2). If you have changed from Positive Ground to Negative Ground and leave the ammeter as it was there will be no damage. The ammeter will, however, read in reverse. That is it will show a discharge when the alternator is charging the battery instead of the other way around. All you need to do to rectify this is reverse the wire at the back of the ammeter.
As to positive and negative ground. There are 6, 12 and 24 volt systems which use negative ground as there are 6, 12 and 24 systems which use positive ground. The battery does not charge any better or any worse with either system. Some alternators will not, however, tolerate being wired up as positive to ground; they blow diodes.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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