1974 Johnson 135 HP Outboard Motors Service manual, Page 38Get this manual
Do not set spark advance to other than specifications providedDo not hold spark plug wires in your hand while checking Cor spark dischargesA severe electrical shock will resultUse insulated pliers designed for this purpose
00 not attempt any tests except lhose listed in the troubleshooting proceduresDo not connect an electric tachometer unless it is type which has been approved Cor use with this system Do not connect this system to any voltage source other than which is
specifiedThe est procedure teps provided in following pages, when used with troubleshooting step chartwill help in troubleshooting the system Test Procedure Steps
When reconnecting magneto C.DIgnition system eads to Power Pack, always refer to diagram provided See Figure12AIg nition coil sequence and sensor coil sequence must be observedAll high tension leads must be separatedCHECK GROUND LEAD ATTACHED TO TERMINAL 1r6 FOR GOOD GROUND
TROUBLESHOOTING THE MAGNETO C.DIGNITION SYSTEM Troubleshooting Step Chart Engine Runs rough or will not run Make sure all connections are secure Engine runs ough Engi.ne Misfires Check Spark Plugs 1Ch eck for loose connections and leads groWlding out aPower Pack ground lead bSensor coils Charge coils dIgnition coils eKey Switch Spark on one or more cylinders Check Spark Plugs 1Ignition coils 2Sensor coils 3Power Pack