1995 Johnson/Evinrude Outboards 40 thru 55 2-Cylinder Service Manual, Page 267Get this manual
Battery Devices Battery IsolatorsIfthe engine is equipped with fully regulated charging system and it's supporting two or more batteries, use only one of the following isolators (made by Guest Products): One engine to two batteriesModel 2420 One engine to three batteriesModel 2424 Two engines to three batteriesModel 2423 Battery ON-OFF SwitchesAny master on-off switch in the engine's electrical system must contain "make-before-break" circuit to protect the engine's charging systemAvoid switching batteries while the engine is running, and turn the switch off only while the engine is stopped Battery Testing 842018
i handled with careIf electrolyte contacts any part of the
'" Battery electrolyte is an acidic solution and should be
body, immediately flush the exposed area with water and seek medical attention as soon as possible1Visual Inspection The first step in determining the condition of battery should be visual inspectionLook for conditions such as damage to the case, loose terminal, evidence of electrolyte seepage, etcThese signs may indicate improper care, installation, or application of the batteryLook for excessive corrosion on the battery terminals and cablesCheck the battery cables for worn or frayed insulationReplace cables, if necessaryCheck the electrolyte level in each cellIf electrolyte level is below the plates, it is possible the battery is permanently damagedAlso look for dirt, oil, or other contaminants floating in the electrolyte2Hydrometer