The wire from the F terminal, are you sure it is the F terminal, and not the S terminal?
I've seen the S (stator) wire used to power an accessory that only gets power when the engine is actually running, like an electric choke, hour meter, etc.
I've never seen the F (field) connected to anything other than the alternator to regulator. If it's not connected, I would not worry about it. Could be a mistake in the harness, could be an unused circuit, very common to have dead end wires.
As for the coil, if you want to do away with the resistor wire, then yes, you can use a coil wound to operate on full 12 volts. But if the resistor wire is staying, you need to keep a coil wound for use with an external resistor.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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