2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Manual, Page 85Get this manual
ELECTRICAL GENERAL
GENERAL
Some information in this section specified for the 9.915 Models may only apply if any of the following kits have been installed: Electric Start Kit, PIN 586398 Remote Electric Start Kit, PIN 176905 Battery Charging Kit, PIN 176942
netic lines of force cutting through the stator windings produce alternating current
CHARGING SYSTEM COMPONENTS
The charging system consists of battery, flywheel, alternator stator, and rectifier
Flywheel
The engine's flywheel contains permanently charged magnetsThe magnets supply energy to power the stator windingsThe magnets must be at their original design strength for full alternator output