1995 Johnson/Evinrude Outboards 50 thru 70 3-cylinder Service Manual, Page 254Get this manual
Running Test, Alternator OutputAll Models Disconnect battery cables before proceeding with this check1Remove the rectifierregulator red lead from the battery side of the starter solenoid2Wire to 40 amp ammeter in series with the rectifier regulator red lead and the battery side of the starter solenoid'" Guard against any red wire, its terminals, or the ammeter ill coming in contact with engine ground while the engine is runningContact may cause arcing
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3The 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 ohmmeter and rectifierregulator running tests in this section