Yamaha WR450F(R) Owner's Service Manual page 702

W
Y
R
1
2
B
LIGHTING SYSTEM
LIGHTS SWITCH INSPECTION
1. Inspect:
Lights switch conduct
G
Tester (+) lead → Yellow lead 1
Tester (–) lead → Blue lead 2
OFF
No continuous while being
Continuous while being OFF → Replace.
AC MAGNETO INSPECTION
1. Inspect:
Lighting coil resistance
G
Out of specification → Replace.
Tester (+) lead → Yellow lead 1
Tester (–) lead → Ground 2
Lighting coil
resistance
0.224 ~ 0.336 Ω
at 20 ˚C (68 ˚F)
RECTIFIER/REGULATOR INSPECTION
1. Connect the battery leads.
2. Start the engine.
3. Turn on the headlight and taillight by turn-
ing on the lights switch.
4. Inspect:
Out-put voltage
G
Out of specification → Replace rectifier/
regulator.
Tester (+) lead → Yellow lead 1
Tester (–) lead → Black lead 2
Out-put voltage
13.0 ~ 14.0 V at
5,000 r/min
6 - 25
–
ELEC
Tester selec-
Y L
tor position
1 2
Ω × 1
→ Replace.
Tester selector
position
Ω × 1
Tester selector
position
ACV-20
+