Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 69Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 69

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IGNITION
Direct Voltage Adapter (OVA)

the ignition system, high voltage is presentDO NOT TOUCH OR any ignition parts while engine is running, while key switch is on or while battery