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Hmm. By "cable" do you mean the wire that actually connects to the plug? You should just check it for continuity, and it should have some resistance. If there is no resistance at all you may need a new plug wire. A mouse or something may have gotten to the cable.
What you want to check is that 12 volts are getting to the coil, the thing that the other end of the cable connects to. Wires should be going from the coil to the points or an ignition box of some kind.
You also need to find either the points, or the electronic ignition box. Either one will need 12 volts to operate correctly. If you have an electronic ignition box and 12 volts are getting to it you may need to have the electronics of the box tested. That part is beyond me. If you have points it should be a simple matter of checking for 12 volts across the points when they are open.
Almost any old plug will fire if it is out of the engine and you have the part with the threads grounded well. Some folks think that the plug will fire just hanging out in the air, but the metal outside of the plug needs to be grounded to the engine or it will not spark.
By the way, the minimum voltage to fire a plug is around 20,000 volts or so. Let us know what you find and we can go from there.
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