1998 Johnson Evinrude "EC" 150, 175 FFI Service Manual, P/N 520211, Page 139Get this manual
Charging System Tests Variable Load Tests For Cranking Battery To test the operation of the rectifierregulator, you must be able to run the engine continuously at approximately 3000 RPM, such as in test tank or on marine dynamometerThe test consists of monitoring the system's response to partially discharged batteryUse variable load tester to discharge the battery50 40
Alternator Output
INote The rectifierregulator requires battery voltage on the red
lead to operateBefore proceeding, verify battery voltage at rectifierregulator red lead when key is ON1Disconnect battery cables[] 2Connect 0-40 amp ammeter in series between the main power relay red lead and the battery side of the starter solenoid3Reconnect the engine's battery cables[] 4Following the manufacturer's directions, connect the variable load tester (carbon pile) across the battery terminals: Stevens Model NoLB-85 and Snap-on Model NoMT540D are examples of testers available