1994 Johnson/Evinrude "ER" 9.9 thru 30 outboards Service Manual, Page 40Get 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 03 its original size (13 eroded) it must be replaced!
rv f2l Test for proper installation ofConnect one meter lead toana the anodeCalibrate ohmmeter on high ohms scalepowerhead ground and the other lead to the anodeBe sure the surface of the anode is clean to make good contactThe ohmmeter should show low readingIf not, remove the anode and clean the area where the anode is installedThe mounting screws and the anode itself should also be cleanedInstall and retest