Like was said below, look at the voltage regulator. Take it off the tractor and look on the mounting tabs or for a stamp on the back side. When I bought my H someone had put in a 12V batt and hooked it up neg ground. Some of the new wiring harness was put in wrong also like the wires were switched on the gen among other things. I had to go through everything before I got that mess fixed but it works great now on 6V pos ground just like it was designed to do when new. It was way worth taking the time to do it right and is now one of the few tractors at the local shows with a 6V and generator still in it. Plus I use it almost everyday and it gives no problems.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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