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Tractor Battery

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Bus Driver

11-17-2004 17:09:39

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My tractor came new in 1978 with two #4EH batteries, each 6 volts, hooked in series for the tractor 12 volt system. When replacement needed, the battery dealer told me that the #3EH had more cranking amps even though the #3EH is a bit thinner. So I have used them for several years, getting about 4 years life, sometimes almost 5 years. Today had to buy again. Asked the man about a 12 volt unit to replace the two 6 volt. The #3EH has 1050 cranking amps. He sold me one #31P which has 1250 amps. Saved big $$$. Had to make wooden spacers so that the clamp frame would hold it tight. It does seem to work well, but is much smaller than the two together. Anyone else made such substitutions? What did you use and what were the results?

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Ramrod

11-18-2004 09:43:02

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Re: Tractor Battery in reply to Bus Driver, 11-17-2004 17:09:39

The basics are that if you tie batteries in series, the voltage doubles, but the amps remain the same. Tie the same two batteries in parallel, the voltage remains the same, but the amps will double.

... so if you take a couple of 6v 500CCA batteries, series = 12v; 500CCA, parallel = 6v; 1000CCA. The same concept means that a couple of 12v 500CCA batteries in parallel would do 12v at 1000CCA. That"s how the batteries in my Chevy diesel pickup are configured.

Ramrod

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Ramrod

11-18-2004 06:33:30

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Re: Tractor Battery in reply to Bus Driver, 11-17-2004 17:09:39

You could also buy two smaller 12v batteries and hook in parallel to double the CCA.

Ramrod

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greenbeanman

11-18-2004 09:20:49

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Re: Tractor Battery in reply to Ramrod, 11-18-2004 06:33:30

I'm a little fuzzy on this and would like to see some other posts as well from those more knowledgable.

I'm of the opinion that a battery may have more CCA (cold cranking amps) than another, but going from two six volt units to one twelve many also cut the time the battery can spin the starter even though with more CCA.

I'm also of the opinion that going to two "like" batteries will not change the CCA, but merely extend the cranking time. As an example, two 400 CCA batteries would not produce 800 CCA, but would produce 400 for nearly twice as long or longer.

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