Yamaha YFM660FS Grizzly 4x4 Supplementary Service Manual page 440

Start the engine and accelerate to about
G
3,000 r/min.
Charging voltage:
14 V at 1,000 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
Tester (–) lead → White terminal
Tester (+) lead → White terminal
Tester (–) lead → White terminal
Measure the stator coil resistance.
G
Charging coil resistance:
0.32 ~ 0.43 Ω at 20 °C (68 °F)
EB804015
5.Wiring connections
Check the connections of the entire charg-
G
ing system.
Refer to "CIRCUIT DIAGRAM".
Replace the rectifier/regulator.
CHARGING SYSTEM
OUT OF
SPECIFICATION
MEETS
SPECIFICATION
CORRECT
9 - 26
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