Yamaha F100B F100C Outboards Factory Service Manual, Page 320Get this manual
Electrical systems
Checking the Rectifier Regulator
1Measure the Rectifier Regulator output peak voltageIf below specification, measure the lighting coil output peak voltageReplace the Rectifier Regulator if the output peak voltage of the lighting coil is above specification
Checking the lighting coil
1Measure the lighting coil output peak voltageReplace the lighting coil if below specification
S60C8130
Digital circuit tester: 90890-03174 Peak voltage adaptor: 90890-03172 Test harness (3 pins): 90890-06770 Lighting coil output peak voltage: White (W) White (W) rmin DC Unloaded Cranking 7.5 8.0 Loaded 1,500 15.5 3,500 15.5