Yamaha RX10K Supplementary Service Manual page 374

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