2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 75Get this manual
IGNITION AND ELECTRICAL ELECTRIC STARTER SYSTEM
ELECTRIC STARTER SYSTEM
Troubleshooting
NOTE: Before troubleshooting the electric starter system, make sure the battery is fully charged and all connections are clean and tight
Circuit Check Schematic
Starter motor relay
0 ::::==:.I I1 111 1
Battery
Starter motor
Fuse Neutral switch
To Rectifier and Regulator