This is the problem I had (in my estimation) with my 4230 JD that I thought was a really poor example of JD engineering. I bought the tractor, built in '79 in '04 and it had a 6 volt battery on each side of the tractor wired in series to develop 12v for the 12v system.
Problem with that setup is that the internal resistance of both batteries was in series with the starter. Therefore, when my 6v batteries started pushing current through my 12v starter, it didn't get 12v, rather 12v - the voltage drops on both batteries which could easily be 1 volt each even though it only took .005 ohms to drop that voltage at the 200 more or less amps it took to spin the diesel.
I had to replace batteries so I bought 2ea 12v replacement batteries (rather than 2ea 6v batteries) and wired them in parallel (+,+....-,-)
Now if my new batteries were to have the same .005 ohms internal resistance, the resistance is now in parallel, halving the current flowing through each resistance and the 2v drop now becomes 0.5 volts and my starter now gets 11.5 volts. Much easier to start when the tractor has been sitting and the batteries could be low on charge.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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