I have a 1960 75 HP Johnson outboard, with a magneto style ignition. Model No. V4SL-12. I have not been able to get a spark. I have replaced the points, condenser, spark plugs and mostly recently the ignition coil and still no spark. I purchased a repair manual for additional help when I began the undertaking, and have followed all of the recommended procedures and still no spark. Any advice is appreciated.