1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 334Get 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 systemThe 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
ingsThe magnets must be at their original design strength for full alternator output
LJ magnets which provide the energy to power the stator wind-
r;1 The engine's flywheel contains the permanently charged
r:J The alternator stator consists of many windings of wire