1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 331Get this manual
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3 Remove O-rings from cylinder Motor and Electrical TestsRepair
2 Connect 12 volt power supply to motor wires (POSITIVE to BLUE; NEGATIVE to GREEN results in motor up directionPOSITIVE to GREEN;