1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 238Get this manual

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Troubleshooting the "Down" Circuit (When "Up" Circuit Is OK) Remote Controls With or Without Trailer Buttons Connect Voltmeter RED lead to Point and BLACK lead to groundDepress the "Down" trim button<

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