1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 43Get this manual
4 Cylinder 16 Ampere Battery Charging Wiring Diagram (with Small Voltage RegulatorRectifier) IMPORTANT: After electrical connections are made, coat all terminal connections using Quicksilver Liquid Neoprene (92-25711), to avoid corrosionBLK BLU GRY RED YEL DBLACK DBLUE DGRAY DRED DYELLOW