For most it is usually a matter of grabbing an old alternator off a parts vehicle from out back, most are negative ground so the tractor gets converted to work with what you have on hand.
With he improved availability of 12 positive ground alternators if you are going to be buying a new alternator I guess you could buy a positive ground one and minimize the things you would have to change over.
Coil polarity if it is a gas engine
Amp meter if so equipped
If you have a radio or plan to put one on polarity will mess with some of them as with any cig lighter plug in accessories, phone charger, GPS, moniters etc.
You could isolate the accessory and still run it on a positive ground system but all the extra hassle kind of defeats the purpose.
For the above reasons negative ground would be my choice.
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Today's Featured Article - Case Farm Equipment - by Jeremy Sweeten. My name is Jeremy Sweeten and I am currently a junior at Purdue University. I am takin a dual major in Agriculture Systems Management and Agronomy. I am from North Central Indiana, Miami County to be exact. My dad teaches for Marion Community School Systems an outdoor lab called Asherwood. We live there to manage the place. They just happen to have a Case 311 with a Triple Range transmission. I grew up mowing, pushing snow, and hauling maple sap with it. In 1986 my parents bought an old,
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