1994 Johnson/Evinrude "ER" CV 85 thru 115 outboards Service Manual, Page 255Get 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
L!J regulator red lead and the battery side of the starter solenoid3Reconnect the engine's battery cables
r:;l 2Connect 0-40 amp ammeter in series between the rectifier
f1l 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"" Excessive battery discharge rates might overheat battery causing electrolyte gassingThis might create an explosive atmospheref1l5Start the engine and run at approximately 4500 RPMUse the variable load tester to draw the battery down at rate equivalent to the stator's full outputThe ammeter should indicate full output6,9, or 10 amps6Decrease the battery load toward zero amps Ammeter should show reduced outputAs the current draw decreases, the battery voltage should stabilize at approximately 14.5 volts If your results vary, check stator condition before replacing rectifierregulator&