1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 322Get this manual
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Power Trim System Wiring Diagram BLK BLU GRN RED BLUWHT GRNWHT BLACK BLUE GREEN RED BLUEWHITE GREENWHITE Negative () Trim Motor (UP) Trim Motor (DOWN) Positive (+) Trim Switch to UP Relay Trim Switch