Yamaha SXV70SJ Supplementary Service Manual page 339

Check the bulb(s).
OK NO CONTINUITY
For VX700DX/VT700:
Check the main fuse,
"IGNITION" fuse and "TAIL" fuse.
Refer to "FUSE INSPECTION" in CHAPTER 2.
OK FAULTY
For VX700DX/VT700:
Check the battery.
Refer to "BATTERY INSPECTION" in CHAPTER 2.
OK OUT OF SPECIFICATION
For VX700/SX700/MM700:
Check the condenser.
Refer to "IGNITION SYSTEM".
OK OUT OF SPECIFICATION
Check the stator coil and pickup coil.
Refer to "IGNITION SYSTEM".
OK OUT OF SPECIFICATION
Check the main switch.
Refer to "IGNITION SYSTEM".
OK FAULTY
Check the load control relay.
Refer to "IGNITION SYSTEM".
OK FAULTY
Correct the connection and/or
replace the rectifier/regulator
and/or CDI unit.
LIGHTING SYSTEM
TAIL LIGHT DOES NOT COME ON.
Replace the bulb(s).
Replace the main fuse, "IGNITION" fuse and/or "TAIL"
fuse.
Replace and/or charge the battery.
Refer to "BATTERY CHARGING" in CHAPTER 2.
Replace the condenser.
Replace the stator coil assembly.
Replace the main switch.
Replace the load control relay.
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