First off, avoid putting lead/acid batteries in parallel(+ with +, negative with negative). If you need more amp hours, buy a bigger flooded lead acid battery, but keep it all in the same case. There will never be a pair of batts that have the same residual charge, and they will go into sympathetic discharge if left connected.
Next, if you must put them in parallel, use a quick disconnect between the negative terminals, or use one of those marine battery disconnects where you can have 1, 2, both, or off. Leave it off when not in use.
Last, you're working with a lot of amps. The cables need to be big, clean and tight. Any kind of resistance will build up corrosion and get worse.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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