2004 SR Johnson 4 Stroke 9.9-15HP Outboards Service Manual, Page 69Get this manual
IGNITION AND ELECTRICAL BATTERY CHARGING SYSTEM CHARGING SYSTEM BATTERY CHARGE COIL COIL OUTPUT Measure: Coil output
Peak Voltmeter Stevens CD-77 Tester selector: POS 50
1Disconnect rectifier2Remove all spark plugsTester probe connection C) (Red) (Black) Red Yellow 3Crank the recoil starter