2006 Johnson SD 30 HP 4 Stroke Outboards Service Repair Manual, PN 5006592, Page 85Get this manual
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ELECTRICAL BATTERY CHARGING SYSTEM
To neutral switch
1 Starter motor relay 2 Fuse (25A) 3 Battery (12V) 4 Rectifier and regulator 5 Battery charge coil 6 Alternator (magneto)