1992 Johnson Evinrude "EN" 9.9 thru 30 Service Manual, P/N 508142, Page 115Get this manual
Principles of Operation Flywheel
f11 The flywheel contains permanent magnets which energize
the charge coil, ignition module, 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 output
Charge Coil
f21 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 ignition module to operate the system
Ignition Module
The ignition module