1995 Johnson/Evinrude Outboards 9.9, 15 four-stroke Service Manual, Page 196Get 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
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
rn The around metal laminationsThemany windings oftowire alternator stator consists of wrapped stator is attached the
The rectifier on 6-amp system consists of series of diodes, built into metal case, which changes the stator's alternating current to the direct current used to charge the batteryOne, several, or all of the rectifier diodes might become damaged, resulting in system grounded condition, no-charge condition, or an incorrect charging rateThe rectifierregulator on 12-amp system performs the above functions and provides full wave regulation of the charging systemAn additional circuit, represented by the gray lead, provides tachometer signal for the OMC Quartach and 7K tachometers