Second check is to remove each HT lead one at a time, including the coil king lead and check its condition along its length looking for cracks and splits. Check the condition of the connectors at each end, and in the cap/coil, checking for the presence of corrosion. Then, check the resistance of each lead. You'll find the readings should be in the 10 - 20 K Ohm range. If you find a lead with a much higher resistance, or completely open circuit, then, it's definitely had it.