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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