1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 82Get this manual

1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 82

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CHARGING AND STARTING SYSTEM
12 Volt Reading
Defective ignition switch

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