You will not be able to accurately measure the resistance of a battery cable using the ohms scale of a typical multimeter. To measure down in the milliohm range you need to do a four-wire measurement, which typically is only supported by laboratory type instruments.
Let's back off a bit. What is it you really want to accomplish? Since you're dealing with a battery cable, I'm going to make a wild guess that you want to know if the cable is "good" or "bad". Well, what constitutes good/bad? The answer ISN'T resistance! It's voltage drop! All resistance is is the relationship between current and voltage. If you don't know what the current demand is for your starter, how can you know what's an acceptable resistance for the cable? You can't. But measuring the voltage drop is going to tell you if the cable is up to the job, and you don't actually need to know the current.
What you do is to pull the coil wire on your vehicle. Set your meter on volts, then measure the voltage between the cable ends while an assistant cranks the starter. I'm not sure what the acceptable range is for voltage drop, but I'd be concerned if it was greater than one volt on a 12 volt system, or half a volt on a six volt system. Personally I would want it to be much less than that, maybe a tenth of a volt from battery terminal to starter terminal.
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