because we live in a world governed by physical laws.
those physical laws state that current flows in a closed circuit, not an open circuit.
ohms law describes it the best .. e=ir
if you do not have current flow, you do not have forward voltage drop across a component like a resistor.
for instance, battery to swtich to resistor to coil, to ground.thru points.
if points are closed, then current is flowing inthe circuit, and the coil will show, if read by a meter, some voltage less than 12v on it, depending on the resistor value, and coil value.
ie.. 12v incoming from battery to resistor, and assuming equal resistance coil and resistor, then the resistor will drop 6v, and thus the coil only sees 6v.
now.. if points are open... everywhere you measure in that circuit is going to show 12v.. you could have a hundred.. or 1000 ressitors in line, and all will show 12v on them as long as current is not flowing.. ie.. points open... no current flow.. no voltage drop.
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