The 450 diesels did use 3 different coil setups. One was 12 volt coil, one was 6 volt coil with external resistor and then they dropped the resistor and still used a 6 volt coil. Put more new coils on those diesels than all the gasoline tractors combined. They went to the straight shaft with no advance and made a hard starting tractor even harder so they left off the resistor and used the 6 volt coil alone. Going through that cut off switch on the manifold they didn't use a bypass wire coming from starter solenoid to go around the resistor for starting. That is the way I remember it anyway.
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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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