2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 261Get this manual
Electrical system Power bobbin output peak voltage: Blue (L) Blue (L) rmin DC rmin DC Unloaded Cranking 10.3 Cranking 9.5 1,500 27.8 Loaded 1,500 27.5 3,500 61.6 3,500 63.2
Checking the power bobbin (for Prime Start)
1Measure the power bobbin output peak voltageReplace the stator coil assembly if below specification
2Disconnect the power bobbin connectorsL L
3Measure the power bobbin resistanceReplace the stator coil assembly if out of specificationPower bobbin resistance (reference data): Blue (L) Blue (L) 0.771.04 at 20 (68 F)