Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 89Get this manual

Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 89

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TEST 7 aConnect voltmeter between common engine ground and Test Point 1bTurn ignition key to "Start" position
No voltage reading; check BLACK cable for poor connection or open circuit
12 V