1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 39Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 39

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Tachometer Terminal Block (Design 1) DESCRIPTION
HIGH VOLTAGE is present at the tachometer block's stator side terminals, while the outboard is runningTo avoid electrical shock, physical contact