1988 Johnson Evinrude CC 60 thru 75 outboards Service Manual, Page 282Get this manual
Rectifier Ohmmeter TestsAll Models
INote Disconnect
battery cables before proceeding with this
1Disconnect all rectifier leads from terminal board '-_
2 Calibrate ohmmeter on high ohms scale and connect one lead to clean engine ground Connect the other lead to the rectifier yellowgray lead Note the readingReverse the ohmmeter connections or press the "reverse polarity" button and note the reading very high reading in one direction and low reading in the other direction indicates that diode is OK Two high readings or two low readings indicate that diode is damaged3Repeat step using the rectifier yellow lead Results should be similar4Move ohmmeter lead from engine ground to rectifier red lead5Repeat test procedure similar to step with ohmmeter leads connected to rectifier red and yellowgray leads very high reading in one direction and low reading in the other direction indicates that diode is OK Two high readings or two low readings indicate that diode is damaged