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You can't really measure ohm resistance in these battery cables. The issue is voltage drop which can only be measured with current running in the cables.
You must use a high impedance voltmeter, generally a digital voltmeter or multimeter (DVOM). Set it on the 2volt range and put one probe at the battery and other probe at the other end of the same battery cable. You can ground the secondary ignition wire to ensure the engine won't start (and protect the ignition system!) and then crank the engine and observe the highest voltage reading. Some meters, Fluke or my Sears, have a min/max setting that will keep the highest reading...if you have one it's easier than watching the meter all the time. The deal here is that E=IR, or the product of the cable resistance and the current flowing through it will give a voltage (drop) that you're measuring. It should not be more than 500millivolts or 1/2 volt or so. Anything over 1.5 volts is grounds for immediate replacement of the cable or some serious connector work (maybe the cable ends have bad connections).
OTOH, it could just be a worn starter. It happens.
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