1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 51Get this manual

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No voltage reading; proceed to TEST 3 TESTDisconnect BLACK ground wire(s) from Test Point 2bConnect voltmeter between common engine ground and Test Point 2cTurn ignition key to "Start" position12 Volt

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