1998 Johnson Evinrude "EC" 90, 100C, 105C, 115, 150, 150C, 175 60 deg. LV Service Manual, P/N 520210, Page 290Get this manual
Description of Charging System The charging system consists of battery, flywheel, an alternator stator, and rectifierregulator which provides full wave regulation of the systemFlywheel
The engine's flywheel contains the permanently charged magnets which provide the energy to power the stator windingsThe magnets must be at their original design strength for full alternator outputStator
The alternator stator consists of many wind ings of wire wrapped around metal laminationsThe flywheel's magnetic lines of force cutting through the stator windings produce alternating current