1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Manual, Page 301Get this manual
Running Test, Alternator OutputAll Models INotel Disconnect battery cables before proceeding with this check1Disconnect the rectifier red lead2Wire 0-40 amp ammeter in series with the rectifier red lead and the wiring harness red lead
!llllltlfl
1000 2000 3000 4000 5000 6000
Guard against any red wire, its terminals, or the ammeter coming in contact with engine ground while the engine is runningContact may cause arcing3The engine's battery should not be fully charged when beginning this testConnect the battery cables and run the engine in test tankRefer to the output curves to determine the correct output-to-RPM ratio for your engine If there is no output or the output is not correct, refer to the stator and rectifier ohmmeter tests in this sectionDRl153