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 - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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