Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 494Get this manual
CHARGING SYSTEM
SERVICE POINTS
CHARGING SYSTEM PEAK VOLTAGE
1Measure: Rectifier-regulator output peak voltage Excessively over specification ReplaceExcessively below specification Check the lighting coil6 model Output peak voltage: R-B rmin V
+: Circuit : Loaded
Cranking6.0
10 model Output peak voltage: R-B rmin V