2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Repair Manual P/N 5005714, Page 68Get this manual
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IGNIION AND ELECTRICAL BATTERY CHARGING SYSTEM
Electric start model
MAGNETO 8AHERY CHARGE COIL
REClF ER AND REGULAOR :
(with optional coil: 12V 120W) Optio