Use a 12 volt test light check for power to the coil positive. Put the test light on the coil negative it should blink if somebody else is cranking the engine.
If it doesn't blink buy a rebuilt distributor or a new pickup it requires a special puller to change this item. If it blinks take the module to Auto Zone or Advanced for a free test.
You can also make sure the relay pulses by holding your finger on it.