you always show bat voltage to all connections in a open series circuit that are on the side tied to battery.
once the points are closed it is no longer a open circuit.
the reason you may not always have 12v to the side of a resistor in a closed series circuit is if there are other resistors ahead of it. IE.. a machine that uses a ballast resistor and has an added resistor for a 12v conversion. if points are closed, only the first resistor in line will have 12v on it.. the next resistor, will have less, and the coil will have even less. each device will drop voltage, in a closed circuit.
that's why you see peopl ask or specify whether points ar eopen or closed.
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