1993 Johnson Evinrude "ET" 90 degrees CV Service Manual, P/N 508285, Page 247Get this manual
Rectifier Ohmmeter Tests88
tel Disconnect battery cables before proceeding with this check
[!] 1Disconnect all rectifier leads from terminal boardr:jl 2Calibrate ohmmeter on appropriate scaleConnect one lead to clean engine groundConnect the other lead to the rectifier yellowgray leadNote the reading Reverse 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 damaged