Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 75Get this manual

Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 75

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4 Hold hydrometer vertically and draw in just enough liquid from battery cell so that float is freettoating Hold hydrometer at eye level so that float is vertical and free of outer tubethen take readi