1998 Johnson Evinrude "EC" 40 thru 55 2-Cylinder Service Manual, P/N 520206, Page 281Get this manual
Description of Charging SystemAll Model s The outboard charging system consists of battery, fly wheel, an alternator stator, and rectifierThe engine's battery can affect the charging system operationThe battery should be of heavy-duty marine construction, should be the correct capacity for the application, and should be in good condition with normal charge[] The engine's flywheel contains the permanently cha rged magnets which provide the energy to power the stator windingsThe magnets must be at their original design strength for full alternator output
The alternator stator consists of many windings of wire wrapped around metal laminationsThe stator is attached to the ignition plate4-amp models) or mounting plate (12-amp models)The flywheel's magnetic lines of force cutting through the stator indings produce alternating currentThe stator or its leads could be damaged which could result in reduced or no alternator output