Yamaha RS90K, Service Manual

Page: 676 / 841

8-26
– +
ELEC
SIGNAL SYSTEM
TROUBLESHOOTING
Check the tail/brake light bulb(s).
Refer to “LIGHTING SYSTEM”.
Check the main fuse, ignition fuse, and signal 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 “IGNITION SYSTEM”.
Check the brake light switch.
Check the load control relay.
Refer to “IGNITION SYSTEM”.
Check the signal system’s wiring.
Refer to “CIRCUIT DIAGRAM”.
Correct the connection and/or replace the rectifier/
regulator and/or ignitor unit.
BRAKE LIGHT DOES NOT COME ON.
OK
NO CONTINUITY Replace the bulb(s).
OK
FAULTY Replace the main fuse, ignition fuse, and/or signal
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 brake light switch.
OK
FAULTY Replace the load control relay.
OK
FAULTY
Properly connect or repair the signal system’s wir-
ing.