Posted by Gerald J. on April 03, 2010 at 18:32:34 from (75.253.232.172):
I had a little time at the university library last week. I found:
Since 1963, SAE standard J543a has stated "the negative terminal of the battery shall be securely grounded." Before that from a committee report in 1955 that new standard J543a stated "The negative terminal of the battery should be grounded." So before 1955 polarity was optional. From 1955 it was recommended the negative post should be grounded, and from 1963 the standard required the negative terminal to be grounded, though it took until at least 1969 for Deere to follow that standard in gas tractors.
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