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 Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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