2000-2005 Yamaha F40B Outboard Service Manual, Page 494Get this manual
ENRICHMENT CONTROL SYSTEM
CHECKING THE BATTERY
Refer to "CHECKING THE BATTERY" on page 3-21
CHECKING THE FUSE
Refer to "CHECKING THE FUSES" on page 8-22
CHECKING THE MAIN SWITCH
Refer to "CHECKING THE MAIN SWITCH" on page 8-18