From the factory the H was set for POSITIVE ground, like your SC.
However ground polarity is pretty much arbitrary - the tractor will start/run/charge just fine with the battery grounded either polarity.
Note however some (thought NOT all...) voltage regulators are designed to work best with the ground polarity as noted on the regulator cover. The tractor should then be grounded as marked.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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