2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 62Get this manual
IGNITION AND ELECTRICAL TESTING IGNITION SYSTEM IGNITION COIL
COIL RESISTANCE Measure: Coil resistance
Digital tester Tester selector:
1Disconnect coil wires2Remove plug capsPrimary side
Tester probe connection () (Red) (Black) Orange Black Coil resistance;
Secondary side
Tester probe connection
Coil resistance;