Yamaha WR450FX, Owner'S Service Manual

Page: 216 / 220

7-19
LIGHTING SYSTEM
CHECKING THE TAILLIGHT
(LEDs)
1. Disconnect the taillight coupler.
2. Connect two jumper leads "1"
from the battery terminals to the
respective coupler terminal as
shown.
3. Check:
• LED (for proper operation)
Does not light
→
Replace the tail-
light assembly.
• A wire that is used as a jumper
lead must have at least the same
capacity of the battery lead, oth-
erwise 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/
REGULATOR
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/regulator.
Battery (+) terminal
→
Blue lead
"2"
Battery (-) terminal
→
Black lead
"3"
Tester (+) lead
→
Yellow lead "1"
Tester (-) lead
→
Ground "2"
Light-
ing coil
resis-
tance
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 se-
lector posi-
tion
12.5–13.5 V
at 5,000 r/
min
ACV-20
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