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 - 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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