Normally a regular 12 volt coil should do, but I do not know what year your 4000 is and if they used a resistance wire or ballast resistor. The best thing is to see if there is any information still visible on the old coil assuming it is the original. They sometimes do midyear changes and don't tell anyone (can you say consumer). Yours might have a 6 volt coil with external resistance. I absolutely do not know.
From what I have read a true 12 volt coil has internal resistance due to the windings, not from an internal ballast resistor, but may need an additional ballast resistor while running If you have a Ford/New Holland dealer near you ask them. There are a bunch of 12 volt can coils that will work. You can tell pretty quickly if it won't crank or the coil gets unreasonably warm while it is running.
One other question. Your 4000 ( year? )should be originally 12v, but was it originally generator equipped and converted or alternator equipped?
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