Yamaha WR250F 2017 Owner's Service Manual page 359

The fuel level warning light fails to come on.
1. Check the fuel sender.
Refer to "CHECKING THE FUEL
SENDER" on page 9-77.
OK 
2. Check the resistor.
Refer to "CHECKING THE RESIST-
ER" on page 9-78.
OK 
3. Check the entire signaling system's
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 9-20.
OK 
Replace the indicator light assembly.
NG 
Replace the fuel sender assembly.
NG 
Replace the resistor.
NG 
Properly connect or repair the signaling
system's wiring.
9-23
SIGNALING SYSTEM