Yamaha 25BMH 30HMH Factory Service Manual, Page 416Get this manual
CHARGING SYSTEM
CHECKING THE LIGHTING COIL
1Measure: Lighting coil resistance Out of specification Checking the peak voltageLighting coil resistance: GG 0.310.37 Measuring steps (1) Disconnect the Green (G) leads from the wire harness(2) Connect the tester to the lighting coil as shownNOTE: When measuring the resistance of 10 or less using the digital tester, the correct measurement cannot be obtainedRe fer to "M EASURING LOW RESISTANCE" on page 8-32Measure: Lighting coil output peak voltage Below specification ReplaceLighting coil output peak voltage GG