2000-2005 Yamaha F40B Outboard Service Manual, Page 490Get this manual
CHARGING SYSTEM (WHOEDET)
CHECKING THE FUSES
Refer to "CHECKING THE FUSES" on page 8-22
CHECKING THE BATTERY
Refer to "CHECKING THE BATTERY" on page 3-21
CHCKING THE RECTIFIER REGULATOR OUTPUT PEAK VOLTAGE
Measure: Rectifierregulator output peak voltage Below specification Replace the rectifierregu latorOutput peak voltage R-B rminD.CV Cranking Opened Closed 1,500 12.5 3,500 12.5