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Connect your ohm meter leads to the primary terminals, not ground. Disconnect the wires first.
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Ditto
Regarding the resistance of the primary windings,
6 volt coil should be aprox 1.5 ohms.
A 12 volt coil that uses an external "ballast resistor" is usually also around 1.5 to 1.7 ohms and will work fine on 6 volts.
Some 12 volt coils have a built-in resistor and are usually around 3 ohms.