Yamaha YFM660FS Grizzly 4x4 Supplementary Service Manual page 208

Charging method using a variable voltage charger
Charger
YES
Adjust the voltage to obtain the
standard charging amperage.
Set the timer to the charging
time determined by the open-
circuit voltage.
Refer to "CHECKING THE BAT-
TERY".
If the required charging time exceeds 5 hours, it is advisable to check the
charging amperage after 5 hours. If there is any change in the amperage,
readjust the voltage to obtain the standard charging amperage.
Leave the battery unused for more than 30 minutes before measuring its
open-circuit voltage.
→
12.8 V Charging is complete.
12.0 ~ 12.7 V
Under 12.0 V
CHECKING THE BATTERY
Measure the open-circuit
voltage prior to charging.
Ammeter
Connect a charger and
ammeter to the battery and
start charging.
Is the amperage higher
than the standard charging
amperage written on the
battery?
YES
→
Recharging is required.
→
Replace the battery.
Adjust the charging voltage to
20 ~ 25 V.
Monitor the amperage for 3 ~
5 minutes. Is the standard
charging amperage exceeded?
If the
exceed the standard charging
amperage
replace the battery.
3 - 61
CHK
ADJ
NOTE:
Leave the battery unused for
more than 30 minutes before
measuring its open-circuit voltage.
NOTE:
Set the charging voltage to
16 ~ 17 V. (If the charging
voltage is lower, charging will
be insufficient, if it is higher,
the battery will be over-
charged.)
NO
NO
amperage does not
after 5 minutes,