1993 Johnson Evinrude "ET" 60 degrees LV Service Manual, P/N 508286, Page 249Get 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 or on marine dynamometerThe 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
The rectifierregulator requires battery voltage from the purple lead to operateBefore proceeding, separate the rectifierregulator purple lead bullet connectorVerify battery voltage at the engine harness connector when the key is ONReconnect the purple lead bullet connector1Disconnect battery cablesr;;J 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 cables1sl4Following the manufacturer's directions, connect the variable load tester (carbon pile) across the battery terminalsSteven's Instrument Model NoLB-85 and Snap-on Model NoMT540D are examples of testers available