1989 Johnson Evinrude "CE" 9.9 thru 30 Service Manual, P/N 507754, Page 280Get this manual
1Visual Inspection The first step in determining the condition of battery should be visual inspectionLook for conditions such as damage to the case, loose terminals, evidence of electrolyte seepageetcThese signs may indicate improper care, installation or application of the battery Look for excessive corrosion on the battery terminals and cables Check the battery cables for worn or frayed insulation Replace cables, if necessaryCheck the electrolyte level in each cellIf electrolyte level is below the plates it is possible the battery is permanently damaged Also look for dirt, oil or other contaminants floating in the electrolyte[2Hydrometer
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INote Disconnect
battery