1993 Johnson Evinrude "ET" 40 thru 55 Service Manual, P/N 508283, Page 291Get this manual
Running Test, Alternator OutputAll Models Disconnect battery cables before proceeding with this check1Remove the rectifier red lead or rectifierregulator red lead from the terminal board2Wire 0-40 amp ammeter in series with the rectifier red lead or rectifierregulator red lead and the wiring harness red lead"" Guard against any red wire, its terminals, or the ammeter coming in contact with engine ground while the engine is runningContact could cause arcingnot be fully charged when beginning this testConnect the battery cables and run the engine in test tankRefer to the output curve to determine the correct output-to-rpm ratio On non-regulated systems: If there is no output or the output is not correct, refer to the stator and rectifier ohmmeter tests in this section On regulated systems: If there is no output or the output is not correct, refer to the stator ohmmeter and rectifier regu lator running tests in this section