It is only wired to the warning light and the ecu. It is a simple switch, on and
off. Bad ground maybe, (chocolate wire) or a burn't bulb? Don't know what
voltage it should read but low since it's off the ecu.
The switch is open in the up position / no continuity
check the bulb
main fuse and signal fuse
battery
stator coil and pick up coil
main switch
main relay
meter assembly
rectifier/regulator
cdi.
That is per the manual of what to check.