Troubleshooting - Yamaha YFM250RX 2008 Service Manual

EBS01067

TROUBLESHOOTING

Any of the following fail to light: head-
light, tail/brake light.
Check:
1. light switch
2. Stator coil resistance
3. wiring connections
(of the entire lighting system)
NOTE: NOTE:
• Before troubleshooting, remove the following
part(s):
1. seat
2. front panel
3. front fender
4. rear fender
5. side cover
• Troubleshoot with the following special
tool(s).
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
EAS00783
1. Light switch
• Check the light switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the light switch OK?
YES
NO
Replace the handle-
bar switch.
7-28
LIGHTING SYSTEM
EAS00776
2. Stator coil resistance
• Disconnect the AC magneto coupler from
the wire harness.
• Connect the pocket tester (Ω × 1) to the
charging coils.
Tester (+) lead → White terminal
Tester (–) lead → White terminal
Tester (+) lead → White terminal
Tester (–) lead → White terminal
Tester (+) lead → White terminal
Tester (–) lead → White terminal
• Measure the stator coil resistance.
Charging coil resistance:
0.688 ~ 1.032 Ω at 20°C (68°F)
YES
ELEC
NO
Replace the pickup
coil/stator assembly.