Yamaha YFM4FAR Service Manual page 356

Start the engine and accelerate to about
G
5,000 r/min.
Charging voltage:
14 V at 5,000 r/min
NOTE:
Use a fully charged battery.
EB804012
4.Charging coil resistance
Disconnect the AC magneto coupler from
G
the wire harness.
Connect the pocket tester (Ω × 1) to the
G
charging coils.
Tester (+) lead → White terminal 1
Tester (–) lead → White terminal 2
Tester (+) lead → White terminal 1
Tester (–) lead → White terminal 3
Measure the stator coil resistance.
G
Charging coil resistance:
0.46 ~ 0.62 Ω at 20 °C (68 °F)
EB804015
5.Wiring connections
Check the connections of the entire
G
charging system.
Refer to "CIRCUIT DIAGRAM".
Replace the rectifier/regulator.
OUT OF
SPECIFICATION
MEETS
SPECIFICATION
CORRECT
9 - 23
CHARGING SYSTEM
MEETS SPECIFICATION
The charging circuit is not faulty.
OUT OF SPECIFICATION
Replace the pickup coil/stator assembly.
POOR CONNECTION
Properly connect the charging system.
– +
ELEC