Good thought on the voltage drop but only if the wire is connected to the coil.
If the wire is powered but hanging open with no load (as shown in the photo), it will read 12V to ground, whether it's a resistor wire or not.
Current needs to flow in the wire to measure its voltage drop.
Either find the other end of the wire and measure resistance directly or hook it to the coil if you want to use a voltage reading.
How much resistance would it have if it was a resistance wire? What is the load resistance of an ignition coil? The ratio of the load resistance and wire resistance will determine the voltage drop within the wire.
For example, if a coil is a 10 ohm resistive load, and the wire is a 10-ohm resistor, then the voltage with the coil pulling current will be 6V. If the wire is straight copper, then the voltage will be near 12V because all the voltage loss will be in the coil.
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