Yamaha 2011 WR250FA, Owner'S Service Manual

Page: 310 / 316

7-22
LIGHTING SYSTEM
CHECKING THE TAILLIGHT (LEDs)
1. Disconnect the taillight coupler.
2. Connect two jumper leads "1" from the bat-
tery terminals to the respective coupler ter-
minal as shown.
3. Check:
• LED (for proper operation)
Does not light
→
Replace the taillight assem-
bly.
• A wire that is used as a jumper lead must
have at least the same capacity of the bat-
tery lead, otherwise the jumper lead may
burn.
• This check is likely to produce sparks,
therefore, make sure no flammable gas or
fluid is in the vicinity.
CHECKING THE AC MAGNETO
1. Inspect:
• Lighting coil resistance
Out of specification
→
Replace.
CHECKING THE RECTIFIER/REGUALATOR
1. Connect the battery leads.
2. Start the engine.
3. Turn on the headlight and taillight by turning
on the light switch.
4. Inspect:
• Out-put voltage
Out of specification
→
Replace rectifier/regu-
lator.
Battery (+) terminal
→
Blue lead "2"
Battery (-) terminal
→
Black lead "3"
Tester (+) lead
→
Yellow lead "1"
Tester (-) lead
→
Ground "2"
Lighting coil re-
sistance
Tester selector
position
0.224–0.336
Ω
at
20 °C (68 °F)
Ω
× 1
Tester (+) lead
→
Yellow lead "1"
Tester (-) lead
→
Black lead "2"
Out-put voltage
Tester selector
position
12.5–13.5 V at
5,000 r/min
ACV-20