1996 Johnson/Evinrude Outboards 8 thru 15 Four-Stroke Service Manual, Page 255Get this manual
Description of Charging System The outboard charging system consists of battery, flywheel, an alternator stator, rectifier (6-amp system), and rectifier regulator (12-amp system)The 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 chargeRefer to Battery Specifications, this section
The alternator stator consists of many windings of wire wrapped around metal laminationsThe stator is attached to the powerheadThe flywheel's magnetic lines of force cutting through the stator windings produce alternating currentThe stator or its leads could be damaged which could result in reduced or no alternator output
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 output