no diode needed i hooked me dc case up this way no switch at all go from # 2 post to batt post on alt. then go from batt post on alt to amp guage then from guage to batteryworks just like a 1 wire alternator dont use the #1 post thats what drains the battery ive had this hooked up this way 2 years never a dead battery unless i run it dead with starter lol only thing is you have to rev engine to excite the alternator but you have to do that with a 1 wire also so whats the difference other than pricemost gas tractors rev high enough but if it dont just use a smaller pulley on alternator or bigger on tractor which ever im sure someone will find fault with this but works for me hope it helps you
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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