Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 82Get this manual

Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 82

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1 Check for correct battery polarity [red cable to positive (+) battery terminal]If polarity was incorrect, check for damaged rectifierSee "rectifier test", later in this section2 Check for loose or c