1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 282Get this manual

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Troubleshooting the "Down" and "Up" Circuits (All Circuits Inoperative) Check in-line fuses (under cowl) to see if fuses are blown
No Voltage Indicated: Check that voltage is being supplied to c

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