1993 Johnson Evinrude "ET" 60 degrees LV Service Manual, P/N 508286, Page 245Get 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 chargeThis charging system is compatible with maintenance-free batteriesA deep-cycle battery must not be used as the engine's cranking batteryFlywheel
r.jl 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 r:;l The alternator stator consists of many windings of wire wrapped around metal laminationsThe flywheel's magnetic lines of force cutting through the stator windings produce alternating currentRectifierIRegulator The rectifierregulator changes the stator's alternating current direct current used to charge the engine's battery and support the boat's electrical systemThe unit also provides full wave regulation of the charging systemThe rectifierregulator has two additional circuits: The gray lead provides tachometer signal for the OMC Quartach and 7K tachometers In situations where engine temperature exceeds 1900 (8r C)' an internal thermo cutoff switch opens to protect the rectifierregulator from damage