Yamaha RS90K Manuel D'atelier page 664

TROUBLESHOOTING
HEADLIGHT AND/OR METER LIGHT DO NOT COME ON.
Check the headlight and meter light bulb(s).
NO CONTINUITY
OK
Check the main fuse, ignition fuse, and headlight
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.
Refer to "CHARGING SYSTEM".
OUT OF SPECIFICATION
OK
Check the main switch.
Refer to "CIRCUIT DIAGRAM".
FAULTY
OK
Check the headlight beam switch.
FAULTY
OK
Check the headlight relay.
FAULTY
OK
Check the load control relay.
FAULTY
OK
Check the lighting system's wiring.
Refer to "CIRCUIT DIAGRAM".
FAULTY
OK
Correct the connection and/or replace the rectifier/
regulator and/or ignitor unit.
LIGHTING SYSTEM
Replace the bulb(s).
Replace the main fuse, ignition fuse, and/or head-
light fuse.
Replace and/or charge the battery.
Refer to "BATTERY INSPECTION" in CHAPTER
2.
Replace the stator coil assembly.
Replace the main switch.
Replace the left handlebar switch.
Replace the headlight relay.
Replace the load control relay.
Properly connect or repair the lighting system's
wiring.
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