Yamaha XT660Z 2008 Service Manual Download

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8-50

ELECTRICAL COMPONENTS

3. Remove:

• Battery

4. Check:

• Battery charge

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a. Connect a pocket tester to the battery termi-

nals.

• Positive tester probe

→

positive battery terminal

• Negative tester probe

→

negative battery terminal

NOTE:

• The charge state of an MF battery can be

checked by measuring its open-circuit voltage
(i.e., the voltage when the positive battery ter-
minal is disconnected).

• No charging is necessary when the open-cir-

cuit voltage equals or exceeds 12.8 V.

b. Check the charge of the battery, as shown in

the charts and the following example.

Example
Open-circuit voltage = 12.0 V
Charging time = 6.5 hours
Charge of the battery = 20–30%

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5. Charge:

• Battery

(refer to the appropriate charging method)

EWA13300

WARNING

Do not quick charge a battery.

EWA13300

CAUTION:

•

Never remove the MF battery sealing caps.

•

Do not use a high-rate battery charger since
it forces a high-amperage current into the
battery quickly and can cause bat-tery over-
heating and battery plate damage.

•

If it is impossible to regulate the charging
current on the battery charger, be careful
not to overcharge the battery.

•

When charging a battery, be sure to re-
move it from the vehicle. (If charging has
to be done with the battery mounted on
the vehicle, disconnect the negative bat-
tery lead from the battery terminal.)

•

To reduce the chance of sparks, do not
plug in the battery charger until the battery
charger leads are connected to the bat-
tery.

•

Before removing the battery charger lead
clips from the battery terminals, be sure to
turn off the battery charger.

•

Make sure the battery charger lead clips
are in full contact with the battery terminal
and that they are not shorted. A corroded
battery charger lead clip may generate
heat in the contact area and a weak clip
spring may cause sparks.

•

If the battery becomes hot to the touch at
any time during the charging process, dis-
connect the battery charger and let the bat
tery cool before reconnecting it. Hot bat-
teries can explode!

•

As shown in the following illustration, the
open-circuit voltage of an MF battery sta-
bilizes about 30 minutes after charging has
been completed. Therefore, wait 30 min-
utes after charging is completed before
measuring the open-circuit voltage.

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Charging method using a variable-current
(voltage) charger

a. Measure the open-circuit voltage prior to

charging.

NOTE:

Voltage should be measured 30 minutes after
the engine is stopped.

b. Connect a charger and ammeter to the bat-

tery and start charging.

NOTE:

Set the charging voltage at 16–17 V.If the set-
ting is lower, charging will be insufficient. If too
high, the battery will be over-charged.

c. Make sure that the current is higher than the

standard charging current written on the bat-
tery.

NOTE:

If the current is lower than the standard charg-
ing current written on the battery, set the charg-
ing voltage adjust dial at 20–24 V and monitor
the amperage for 3–5 minutes to check the bat-
tery.