Johnson Evinrude Outboard Motors 1956-1970 1.5-40hp repair manual., Page 191Get this manual
BATTERY SERVICE 3- Using more electrical power than the generator or al ternator can replace resul ting in an undercharged condition4- defect in the charging systemA faul ty generator or al ternator system, defective regulator, or high resistance somewhere in the system, could cause the battery to become undercharged5- Failure to maintain the battery in good orderThis might indude low level of electrolyte in the cells; loose or dirty cable connections at the battery terminals; or possibly an excessivel dirty battery topElectrol yte Level The most common practice of checking the electrol yte level in battery is to remove the cell cap and visually observe the level in the vent wellThe bottom of each vent well has split vent which will cause the surface of the electrolyte to appear distorted when it makes contactWhen the distortion first appears at the bottom of the split vent, the electrolyte level is correctSome late-model batteries have an electrolyte-level indicator installed which operates in the following manner: transparent rod extends through the center of one of the cell capsThe lower