Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 100Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 100

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CHARG tNGSTARTING SYSTEM
12 Volt Reading"
Defective ignition switch

Connect voltmeter between common engine ground and Test Point 6
No voltage reading; check BLACK wire