Suzuki DF25/DF30 Four Stroke Service Manual, Page 73Get this manual
ELECTRICAL 4-3
INSPECTION
BATTERY CHARGE COIL Two methods can be used to inspect coil conditionChecking coil output
Peak voltmeter stevens CD-77 Tester rangePOS 50 1Disconnect battery charge coil leads from rectifierregulator2Connect the peak voltage tester between coil leads3Remove all spark plugs4Measure coil output at crankingBattery charge coil output
Tester probe connection RedYellow Black Red Coil output Manual start model4V or over Electric start model8V or over
If measurement exceeds specification, replace battery charge coil