1996 Johnson/Evinrude Outboards 50 thru 70 3-Cylinder Service Manual, Page 259Get this manual
Rect ifierRegulator Tests Variable Load Tests To test the operation of the rectifierregu lator, you must be able to run the engine continuously at approximately 4500 RPM, either 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
INote The
rectifierregulator requires battery voltage on the purple lead to operateBefore proceeding, verify battery voltage at terminal strip purple leads when key is ON1Disconnect battery cables
rn 2Connect redto lead amp ammeter in seriesofbetween the 40 rectifierregulator and the battery side the starter
solenoid3Reconnect the engine's battery cables
rn 4Following 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