Yamaha WR450F(S) Owner's Service Manual page 684

Y W
R
1
2
B
CHARGING SYSTEM
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
Couplers and leads connection
G
Rust/dust/looseness/short-circuit →
Repair or replace.
CHARGING VOLTAGE INSPECTION
1. Start the engine.
2. Inspect:
Charging voltage
G
Out of specification → If no failure is
found in checking the source coil resis-
tance, replace the rectifier/regulator.
Tester (+) lead → Red lead 1
Tester (–) lead → Black lead 2
Charging
voltage
14.1 ~ 14.9 V at
5,000 r/min
3. Inspect:
Charging coil resistance
G
Out of specification → Replace.
Tester (+) lead → White lead 1
Tester (–) lead → Ground 2
Charging coil
resistance
0.288 ~ 0.432 Ω
at 20 ˚C (68 ˚F)
6 - 18
– +
ELEC
Tester selector
position
DCV-20
Tester selector
position
Ω × 1