I use master disconnect switches on all mine. Regardless, all you have to unhook is one lead and it makes no difference which.
Ringer mentioned switches always disconnecting the the ground lead? Evey OEM setup I've ever seen is the opposite and unhooks the positive. Deere crawlers come standard equipped with a master disconnect (on the positive). Crawlers tend to have rear-mounted batteries with a long cable run. The cable sometimes can start fires when insulation wears off; thus the standard disconnect.
Master switches on tractors with big or dual batteries need high-amp rated switches. New, they cost around $40-$50 if you shop around. Gas tractors or small diesels can get by with a small switch. I have them on all my cars and trucks also, that hook directly to the positive battery post.
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