Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 462Get this manual
IGNITION SYSTEM
E IGNITION SYSTEM PEAK VOLTAGE
When checking the CDI unit do not touch any of the connections of the digital tester lead wires
1Measure: CDI unit output peak voltage Below specification Replace the ignition coil or check the CDI unit6 model 10 rmin 1, 2