1998 Johnson Evinrude EC 5 thru 15 HP Four Stroke Service Manual, Page 323Get this manual
RectifierRegulator Tests Variable Load Tests To test the operation of the rectifierregulator, you must be able to run the engine continuously at approximately3000 RPM, 6-amp system, or 5000 RPM, 12-amp systemThe test consists of monitoring the system's response to partially discharged batteryTwo methods for performing this test are described belowVariable Load High Rate Discharge Method
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rectifierregulator requires battery voltage from the purple lead to operateBefore proceeding, separate the rectifier regulator purple lead bullet connectorVerify battery voltage at the engine harness connector when the key is ON Reconnect the purple lead bullet connector1Disconnect battery cables
2Connect 0-40 amp ammeter in series between the rectifier regulator red lead and the battery side of the starter solenoid
3Reconnect the engine's battery cables