Hummer H3. Manual — part 7

Is the repair complete?

Go to Step

13

-

13

1. Clean and wire brush the lead face of

both battery terminals and the metal
contact rings in both cable
connectors.

2. Remove the bolts from the cable

connectors in order to provide access
to the connector rings as needed.

3. If either of the battery terminals or

the cable rings are excessively
damaged or corroded, replace as
needed.

Are the metal connecting parts clean and in
good condition?

-

Go to Step

14

-

14

1. Connect the positive battery cable to

the battery positive terminal.

2. Tighten the cable bolt to the specified

value.

Is the cable bolt properly tightened?

15 N.m (11

lb ft)

Go to Step

15

-

15

1. Connect the negative battery cable to

the battery negative terminal.

2. Tighten the cable bolt to the specified

value.

Is the cable bolt properly tightened?

15 N.m (11

lb ft)

Go to Step

16

-

16

1. Install the J 42000 Battery Tester.

See Special Tools.

2. Follow the directions supplied with

the tester.

3. Follow any direction displayed on the

IMPORTANT:

Ensure that all of the electrical loads are
turned OFF.

-

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

BATTERY CHARGING

Tools Required

J 42000 Battery Tester. See Special Tools.

For best results, use an automatic taper-rate battery charger with a voltage capability of 16
volts.

The charging area should be well ventilated.

Do not charge a battery that appears to be frozen. Allow the battery to warm to room
temperature and test it using the J 42000 before charging. See Special Tools.

Battery State of Charge

tester.

Did the tester pass the battery?

Go to Step

17

Go to Step

18

17

1. Press the CODE button on the J

42000 . See Special Tools.

2. For warranty purposes, write the

displayed code on the repair order.

Did you complete this action?

-

Battery OK

-

18

1. Press the CODE button on the J

42000 . See Special Tools.

2. For warranty purposes, write the

displayed code on the repair order.

3. Replace the battery. Refer to Battery

Replacement.

Did you complete the replacement?

-

Battery OK

-

19

Replace the battery. Refer to Battery
Replacement.
Did you complete the replacement?

-

Battery OK

-

IMPORTANT: Using voltage to determine the batteries state of charge (SOC) is

only accurate after the battery has been at rest for 24 hours. This
is enough time for the acid in each cell to equalize. If the battery
has been charged or discharged in the past 24 hours, the battery

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

The maintenance-free batteries SOC is estimated by reading the voltage of the battery across the
battery terminals. Because the voltage is affected by current flow into or out of the battery, the
engine must be stopped and all electrical loads turned OFF, including parasitic loads, when
checking the voltage. The voltage can also be affected if the battery has just been charged or
discharged, so it is important to consider what has happened to the battery in the time just before
testing. Use the following procedure to determine the batteries SOC:

1. Be sure all electrical loads are turned OFF.

2. Determine whether the battery has been used in a vehicle or charged within the past 12

hours.

If the answer is no, the terminal voltage will be stabilized and no action is necessary
before reading the voltage. Skip to step 3.

If the answer is yes, terminal voltage will not be stabilized and you should wait 12
hours since the last time the battery was used.

3. Estimate the battery temperature by determining the average temperature to which the

battery has been exposed for the past 12 hours.

4. Measure the battery voltage at the battery terminals. Refer to the following table to

determine the SOC according to the estimated battery temperature:

Battery Charging

Use the SOC information as follows:

A battery with a SOC that is below 65 percent must always be recharged before returning it
to service or continuing storage.

SOC will only be an estimate.

IMPORTANT: The table is accurate to 10 percent only after the battery has

been at rest for 12 hours.

Battery Voltage

% Charge at 0°C (32°F)

% Charge at 25°C (75°F)

12.75 V

100%

100%

12.7 V

100%

90%

12.6 V

90%

75%

12.45 V

75%

65%

12.2 V

65%

45%

12.0 V

40%

20%

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

A battery with a SOC that is 65 percent or greater is generally considered to be charged
enough in order to be returned to normal service or in order to continue storage. However,
if the battery is being used in slow traffic or with short drive times, or if the temperature is
very hot or very cold, the battery should be fully charged, to at least 90 percent, before
returning it to service or continuing storage.

Charging Time Required

The time required to charge a battery will vary depending upon the following factors:

The battery charger capacity-The higher the charger amperage, the less time it will take to
charge the battery.

The SOC of the battery-A completely discharged battery requires more than twice as much
charging time as a half charged battery. In a discharged battery with a voltage below 11
volts, the battery has a very high internal resistance and may only accept a very low current
at first. Later, as the charging current causes the acid content to increase in the electrolyte,
the charging current will increase. Extremely discharged batteries may not activate the
reversed voltage protection in some chargers. Refer to the manufacturer's instructions for
operating this circuitry.

The temperature of the battery-The colder the battery is, the more time it takes to recharge
the battery. The charging current accepted by a cold battery is very low at first. As the
battery warms, the charging current will increase.

Charging Procedure

When charging side-terminal batteries with the battery cables connected, connect the charger to
the positive cable bolt and to a ground located away from the battery. When charging side-
terminal batteries with the battery cables disconnected, install the battery side terminal adapters
and connect the charger to the adapters.

Tighten: Tighten the battery side terminal adapters to 15 N.m (11 lb ft).

Use the following procedure to charge the battery:

NOTE:

Turn OFF the ignition when connecting or disconnecting the battery
cables, the battery charger or the jumper cables. Failure to do so
may damage the PCM or other electronic components.

NOTE:

Refer to Fastener Notice in Cautions and Notices.

2006 Hummer H3

2006 ENGINE Engine Electrical - H3