2006 SD Johnson 4 Stroke 9.9-15HP Outboards Service Manual, Page 74Get this manual
ELECTRICAL BATTERY CHARGING SYSTEM Fuse Remove plate by sliding it upwardRemove the fuse from fuse caseInspect the fuse and replace with new 20-amp fuse if needed
Fuse Case
Disconnect battery cables at the batteryDisconnect white lead wire of rectifier from engine wire harnessCheck continuity between white lead wire of engine wire harness and red lead wire of starter motor magnetic switch "8" terminal