Ohmmeters are the least accurate meter you can buy. Cheapie digital meters can't be adjusted to zero ohms like the old analog meters. Ammeter are more accurate. use a 12v battery and connect it to the coil. Most coils require 4 amps.
Ohm's law 12v = 4 amps x 3 ohms..
So 4 amps means the internal resistance is 3 ohms.
My Jubilee was converted to 12v and it has a 6v coil. I measured 4 amps and 6 volts used by coil and 6 volts used by ballast.
Try using an ammeter instead of a voltmeter.
A 6v coil connected to 12v will draw 8 amps..
Don't leave connected to 12v too long or it will damage coil..
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