1992 Johnson Evinrude "EN" 60 thru 70 Service Manual, P/N 508144, Page 36Get this manual
AnodesTesting and Replacement Erosion or disintegration in salt or brackish water indicates the anodes are performing their functionThe anodes should be inspected at intervals and replaced when necessary, or corrosion of the engine will increaseIf any anode has been reduced to its original size (V3 eroded), it must be replaced! To increase the duration ofthe anodic protection, the starboard stern bracket (on some models) is drilled to accept an additional anode
rv 121 Test for proper installation of Connect one meter lead an the anodeCalibrate ohmmeter on appropriate scaleto