1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Manual, Page 110Get this manual
Principles of Operation Flywheel
The flywheel contains permanent magnets which energize the charge coil, sensor coil, and alternator statorOnce the flywheel exceeds minimum cranking RPM, the flywheel's magnetic lines of force pass through the ignition plate components to produce voltage in those circuits
The flywheel must be in good condition and correctly located to ensure proper ignition timing and sufficient charge coil outputCharge Coil
The charge coil consists of many windings of wire wrapped around metal laminationOnce the flywheel exceeds minimum cranking RPM, the flywheel's magnetic lines of force pass through the charge coil windings to produce approximately 300 volts of alternating current
This voltage is supplied to the power pack to operate the systemSensor Coil