2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 60Get this manual
IGNITION AND ELECTRICAL TESTING IGNITION SYSTEM
TESTING IGNITION SYSTEM
Assembly is reverse of disassembly with special attention to following steps
AWARNING Always disconnect the battery before commencing resistance testCONDENSER CHARGE COIL
COIL OUTPUT Measure: Coil output
Peak Voltmeter Stevens CD-77 Tester selector: POS 500
(1 )Disconnect coil wires
Tester probe connection () (Red) (Black) Green BlackRed