Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 486Get this manual

Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 486

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CHARGING SYSTEM (F8CW) CHECKING THE RECTIFIER AND RECTIFIERREGULATOR

When measuring closed (cranking), 1500 rmin, and 3500 rmin, disconnect the positive (+) terminal of the battery