I have a 1974 115 Evinrude O/B ( CD-4 Ignition ) cyl 2 & 4 have great spark, cyl 1 & 3 have no spark ( erratic ) or at times spark for 6 to 8 time then stop for a long time. I switched coils and the same happens, I did a Sensor Coil Resistance Test - 7.8 to 8.0 ohms ( in range ) ,Charge Coil Resistance Test - 594 ohms ( in range ) . I do not have a S-80 or M80 Neon Light Tester, is there any other way to do a Sensor Coil Output Test, Charge Coil Output Test, Power Pack Output Test. I did replace the Power Pack last years, do you think it is gone once again. or is the problem else where. Thanks for you time.