Yamaha WR250F(R) Owner's Service Manual page 800

LIGHTING SYSTEM
INSPECTION STEPS
Refer to the following flow chart when inspecting the ignition system for possible problems.
Check the bulb and bulb socket.
OK
Check the light switch.
OK
Check the AC magneto.
OK
Check the entire lighting system
proper for connections.
OK
Check the rectifier/regulator.
NOTE:
• Replace the bulb and/or bulb socket.
1) Seat
2) Fuel tank
• Use the following special tool.
Pocket tester:
YU-3112-C/
90890-03112
Inductive tachometer:
YU-8036-B
Engine tachometer:
90890-03113
LIGHTING SYSTEM
No good
No good
Lighting coil
Improperly connected
Out-put voltage
6 - 67
ELEC
Replace the bulb and/or
bulb socket.
No good
Repair or replace.
No good
– +
Replace.
Replace.
Replace.