John Deere uses them OEM on many crawlers. It doesn't matter if you hook it to positive or negative although positive is the accepted convention (if a neg ground system). Main thing is to get one that can carry enough amps so the starter works properly. Many are rated very low.
Walmart sells cheap shut-off that mount directly on the battery post and they work fine.
Surplus center sells a nice HD battery disconnect switch for $19:
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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