Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 460Get this manual
IGNITION CONTROL SYSTEM CHECKING THE MAIN SWITCH (F8CW)
Check: Main switch continuity Out of specification ReplaceLeads color Switch White Black position (W) (B) OFF ON START Red (R) Yellow Brown (Y) (BR)
CHECKING THE ENGINE STOP SWITCH
Check: Engine stop switch continuity Out of specification Replace