Yamaha RX10K Supplementary Service Manual page 380

WATER TEMPERATURE INDICATOR LIGHT DOES NOT COME ON.
Check the water temperature indicator light bulb(s).
Refer to "LIGHTING SYSTEM".
NO CONTINUITY
OK
Check the main fuse, ignition fuse and signal fuse.
Refer to "FUSE INSPECTION" in CHAPTER 2.
FAULTY
OK
Check the stator coil and pickup coil.
OUT OF SPECIFICATION
OK
Check the battery.
Refer to "BATTERY INSPECTION" in CHAPTER 2.
OUT OF SPECIFICATION
OK
Check the main switch.
Refer to "IGNITION SYSTEM".
FAULTY
OK
Check the water temperature sensor.
FAULTY
OK
Check the main relay.
Refer to "IGNITION SYSTEM".
FAULTY
OK
Correct the connection and/or
replace the meter assembly
and/or the rectifier/regulator
and/or the CDI unit.
SIGNAL SYSTEM
Replace the bulb(s).
Replace the main fuse, ignition fuse and/or
signal fuse.
Replace the stator coil and pickup coil
assembly.
Replace and/or charge the battery.
Refer to "BATTERY INSPECTION" in
CHAPTER 2.
Replace the main switch.
Replace the water temperature sensor.
Replace the main relay.
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