2003 Johnson ST 6/8 HP 4 Stroke Outboards Service Manual, PN 5005471, Page 69Get this manual
IGNITION COMPONENTS
COMPONENTS
Flywheel
The flywheel contains permanent magnets which energize the charge coil, and sensor coilOnce 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
Power Coil
The power coil consists of many windings of wire wrapped around metal laminationOnce the flywheel exceeds minimum cranking RPM, the flywheel's magnetic lines of force cut through the coil windings to produce voltageThis voltage is supplied to the power pack to operate the S.LOW warning system
Sensor Coil
The sensor coil consists of many windings of wire wrapped around metal laminationOnce the flywheel exceeds minimum cranking RPM, the flywheel's magnetic lines of force cutting through the sensor coil windings produce approximately volts
1Permanent magnets