Hummer H3. Manual - part 6

Charging System Description and Operation

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the Starting and
Charging Systems. Refer to Checking Aftermarket Accessories in Wiring Systems.

Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to
Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:

Battery Inspection/Test (Non-HP2)

Charging System Test

Charge Indicator Always On

Charge Indicator Inoperative

Generator Noise Diagnosis

Starter Solenoid Does Not Click

Starter Solenoid Clicks, Engine Does Not Crank

Engine Cranks Slowly

BATTERY INSPECTION/TEST (NON-HP2)

Diagnostic Aids

CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.

IMPORTANT:

The battery test using the J 42000 Battery Tester requires
correct connections to the battery terminals. See Special
Tools. A failure to obtain the correct connections during the
test may result in a failed test on a good battery.

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

Follow these instructions in order to avoid an incorrect diagnosis because of connections:

If testing the vehicle with the battery cables still connected, wiggle the J 42000 clips on the
terminal bolt. See Special Tools. This may cut through any coating or through any
oxidation that may be present on the bolt.

Even new bolts contain a protective coating that may insulate or cause a resistance in the
test circuit.

If correct connections to the battery terminal bolts in the vehicle are in doubt, perform the
following steps:

1. Disconnect the negative battery cable.

2. Disconnect the positive battery cable.

3. Install the test adapters on the terminals.

4. Follow the instructions for testing a removed battery.

If the tester displays a REPLACE BATTERY or BAD CELL-REPLACE result for a
battery tested in the vehicle with the battery cables connected, perform the following steps:

1. Disconnect the negative battery cable.

2. Disconnect the positive battery cable.

3. Install the tester adapters.

4. Follow the instructions for testing a removed battery.

5. Replace the battery only if the second test shows a REPLACE BATTERY or BAD

CELL-REPLACE result.

Use the test code from the second test for any warranty purposes.

Use the Out of Vehicle test for each battery when testing a
vehicle with dual batteries.

IMPORTANT: Always write the test code displayed by the tester on the

repair order for any warranty purposes. The number is a
unique code that describes the test data for a particular
battery at a particular time. The test code may
occasionally repeat when you retest the same battery.
More often, each test will result in a different code. Use
the test code from the second, or Out of Vehicle test.

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

Use the correct terminal adapters.

Do not use any common bolts or a combination of bolts, of nuts, and of washers as adapters
when testing the battery.

Use the test adapters that are provided with the J 42000 or GM P/N 12303040 terminal
adapters. See Special Tools. If the adapters that are provided with the J 42000 require
replacement, use GM P/N 12303040. See Special Tools. Any other adapter may not
contact the correct areas of the battery terminal, causing a resistance that may result in an
invalid battery test result.

Battery Inspection/Test (Non-HP2)

Step

Action

Value(s)

Yes

CAUTION:

Refer to Battery Disconnect Caution in Cautions and Notices.

Inspect the battery for a cracked, broken,
or damaged case, which may be indicated
by battery acid leakage.
Is the battery OK?

Go to Step 2

Go to Step

Compare the Cold Cranking Amperage
(CCA) and Reserve Capacity (RC) of the
battery to the original battery or Original
Equipment (OE) specification. Refer to
Battery Usage.
Does the battery meet or exceed the
specifications?

Go to Step 3

Go to Step

Does the hydrometer display a yellow dot?

Go to Step 4 Go to Step 5

Tap the hydrometer lightly on top with the
handle of a small screwdriver in order to
dislodge any air bubbles inside the battery.
Does the hydrometer still display a yellow
dot?

Go to Step

Go to Step 5

1. Turn OFF the ignition.

2. Attempt to rotate the negative battery

cable connector clockwise with light
finger pressure.

Does the negative connector rotate?

Go to Step 6 Go to Step 7

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

Use a torque wrench in order to verify the
torque to loosen the negative battery
terminal bolt.
Is the torque above the specified value?

10 N.m (88

lb in)

Go to Step 8 Go to Step 7

Disconnect the negative battery cable.
Is the cable disconnected?

Go to Step 9

1. Disconnect the negative battery cable.

2. Inspect for the following conditions

and repair as needed:

The cable bolt is too long or
deformed at the end.

There is foreign material present
inside the nut in the battery
terminal.

Damage to the battery terminal
face or cable connector ring.

Is the repair complete?

Go to Step 9

Rotate the positive battery cable connector
clockwise with light finger pressure.
Does the positive connector rotate?

Go to Step

Use a torque wrench in order to verify the
torque to loosen the positive battery
terminal bolt.
Is the torque above the specified value?

10 N.m (88

lb in)

Go to Step

Disconnect the positive battery cable.
Is the cable disconnected?

Go to Step

1. Disconnect the positive battery cable.

2. Inspect for the following conditions

and repair as needed:

The cable bolt is too long or
deformed at the end.

There is foreign material present
inside the nut in the battery
terminal.

Damage to the battery terminal
face or cable connector ring.

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

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