1995 Johnson Evinrude "EO" 90 CV 85 thru 115 Service Manual, P/N 503150, Page 254Get this manual
RectifierRegulator Tests Variable Load Tests To test the operation of the rectifierregulator, you must be able to run the engine continuously at approximately 4500 RPM, such as in test tank, on marine dynamometer, or on the boatThe test consists of monitoring the system's response to partially discharged batteryTwo methods for performing this test are described belowVariable Load High Rate Discharge Tester The rectifierregulator requires battery voltage from the purple lead to operateBefore proceeding, verify battery voltage at terminal strip purple leads when key is ON1Disconnect battery cables
r:;l 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
rv 4Following the (carbon pile) across the battery terminalsmanufacturer's directions, connect the variable load tester