I would recommend against two 12V in parallel, unless you're willing to replace BOTH batteries at the same time, every time. One goes bad, replace BOTH.
In parallel the two batteries need to be the same so they charge and discharge evenly. If you put a weak old battery together with a strong new battery, when the old battery goes bad you don't notice it right away. This causes the new battery to get overcharged due to the old battery not wanting to accept a charge. This also causes the new battery to get drawn down while the tractor sits because it keeps trying to charge the old weak battery.
What happens then is a vicious circle of replacing one battery, then the other, then the first one again, then the other again, and so on... One battery keeps ruining the other in turn.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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