Yamaha RS90K, Service Manual

Page: 664 / 841

8-21
– +
ELEC
LIGHTING SYSTEM
TROUBLESHOOTING
Check the headlight and meter light bulb(s).
Check the main fuse, ignition fuse, and headlight
fuse.
Refer to “FUSE INSPECTION” in CHAPTER 2.
Check the battery.
Refer to “BATTERY INSPECTION” in CHAPTER 2.
Check the stator coil.
Refer to “CHARGING SYSTEM”.
Check the main switch.
Refer to “CIRCUIT DIAGRAM”.
Check the headlight beam switch.
Check the headlight relay.
Check the load control relay.
Check the lighting system’s wiring.
Refer to “CIRCUIT DIAGRAM”.
Correct the connection and/or replace the rectifier/
regulator and/or ignitor unit.
HEADLIGHT AND/OR METER LIGHT DO NOT COME ON.
OK
NO CONTINUITY Replace the bulb(s).
OK
FAULTY Replace the main fuse, ignition fuse, and/or head-
light fuse.
OK
OUT OF SPECIFICATION Replace and/or charge the battery.
Refer to “BATTERY INSPECTION” in CHAPTER
2.
OK
OUT OF SPECIFICATION Replace the stator coil assembly.
OK
FAULTY Replace the main switch.
OK
FAULTY Replace the left handlebar switch.
OK
FAULTY Replace the headlight relay.
OK
FAULTY
Replace the load control relay.
OK
FAULTY Properly connect or repair the lighting system’s
wiring.