I am a newby to outboard repair and have been given a 1954 Johnson 5.5 ho cd-11 outboard. When running it I could not get it to idle down. I determined that the bottom cylinder was not running. Pulled the fw and found cracked and ugly coils. I have replaced the coils and now get no spark on either cylinder. I have not replaced the points and condensers as of yet. I do get continuity on both hi tension wires. I was not for sure which wire was the ground so I have tried it with both wires going to ground (one at a time) with no difference. What would make the spark disappear on both cylinders?