Hummer H1 (2006+). Manual - part 339

 

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Hummer H1 (2006+). Manual - part 339

 

 

12-32

Electrical System

_______________________________________________________

8

1.

Maintain the engine speed at 2500 RPM.

NOTE: If the generator is not capable of produc-
ing the Load Test amps, operate the alternator at
it's maximum possible output.

2.

Turn ON the load of the carbon pile tester 
and increase the load until the generator out-
put is equal to the Load Test value given in 
alternator usage.

Does the red DIAGNOSTIC lamp on the tester 
illuminate?

Go to Step 15 

Go to Step 9

9

1.

Maintain the engine speed at 2500 RPM and 
continue to operate the alternator at the load 
test value. 

2.

Measure the voltage drop from the output ter-
minal of the alternator to the positive termi-
nal on the battery. 

Does the voltage measure greater than the speci-
fied value?

0.5 Volts

Go to Step 11

Go to Step 10

10

1.

Maintain the engine speed at 2500 RPM and 
continue to operate the alternator at the load 
test value.

2.

Measure the voltage drop from the battery 
negative terminal to the metal housing of the 
alternator. 

Does the voltage measure greater than the speci-
fied value?

0.5 Volts

Go to Step 12 

Go to Step 16

11

Repair the high resistance or an open in the output 
circuit of the alternator. 
Did you complete the repair?

Go to Step 16 

12

Repair the high resistance or open in the ground 
circuit of the alternator.
Did you complete the repair?

Go to Step 16 

13

1.

Disconnect the J 41450-B tester harness con-
nector from the alternator, but leave the alli-
gator clips connected so that the green 
POWER lamp remains illuminated.

2.

Connect a jumper lead, with an in-line 100-
ohm resistor between the J 41450-B tester 
harness connector terminal B of the alterna-
tor and a good ground.

Does the red DIAGNOSTIC lamp illuminate?

Go to Step 15 

Go to Step 14

14

There is a problem with the J 41450-B . Refer to 
the manufacturers instructions, how to test the J 
41450-B for proper operation.
Has the J 41450-B tester been replaced?

Go to Step 3

 Alternator Inoperative (No Charge)  (Figure 12-86)

Step

Action

Value(s)

Yes

No

______________________________________________________

 Electrical System  12-33

STARTER 

Removal

1.

Disconnect the battery negative cable(s) and the winch negative cable, if equipped.

2.

Loosen the bolts securing the starter to the transmission.

3.

Then lower the starter to gain access to the terminals.

4.

Remove the cap and/or adhesive sealant from the starter terminal  (Figure 12-32).

5.

Disconnect the starter cable or the cables from the starter terminals (See Figure 12-32).

6.

Disconnect the solenoid wire from the solenoid.

7.

Remove the starter from the vehicle.

Installation

1.

Connect the solenoid wire to the solenoid terminal with the clip and the screw. Tighten the screw to 22 lb-in. (2 N•m).

2.

Connect the starter cable to the starter terminal. Tighten the nut to 25-31 lb-ft (34-42 N•m).

3.

Position the starter in the converter housing.

4.

Install and tighten the starter bolts to 58 lb-ft (78 N•m).

5.

Connect the battery negative cable.

15

Replace the alternator.
Did you complete the replacement?

Go to Step 16 

16

Operate the vehicle in order to verify the repair.
Did you correct the condition?

System OK

Go to Step 2

 Alternator Inoperative (No Charge)  (Figure 12-86)

Step

Action

Value(s)

Yes

No

12-34

Electrical System

_______________________________________________________

Figure 12-32:   Starter Mounting 

Starter Test

1.

Connect the voltmeter, ammeter, switch and the battery to the starter as shown (Figure 12-33).

CAUTION: Do not operate the starter motor for more than 10 seconds at a time. Allow the starter motor to cool at least 2 minutes
between tests to avoid overheat damage.

WARNING:  Starter must be secured to prevent movement from start up torque. Test cables must be of a sufficient
gauge size to conduct starter current.

2.

Close the switch, and adjust the voltage to 9.5 volts on the voltmeter using a carbon pile. Check the rotating speed of the
armature with a tachometer. Read the current draw on the ammeter.

3.

Maximum current draw should be 65 amps with a minimum armature speed of 5000 rpm. If a low speed, high current
condition exists, check the armature for shorts or grounds. If a low speed, low current draw exists, inspect the starter motor for
a bad connections or a poor brush contact.

STARTER

STARTER

SOLENOID

STARTER BOLT

CABLE

SOLENOID WIRE

______________________________________________________

 Electrical System  12-35

Figure 12-33:   Starter Test Connections

 Starter Solenoid Click, Engine Does Not Crank

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check - Vehi-
cle?

Go to Step 2 

Diagnostic System 

Check - Vehicle in 

Vehicle DTC Infor-

mation

2

Turn the ignition to the START position.
Did the starter solenoid click?

Go to Step 3 

Go to Starter Sole-

noid Does Not Click 

3

Inspect the engine and belt drive system for mechanical 
binding seized engine, seized alternator.
Does the engine move freely?

Go to Step 4

Go to Engine Will 

Not Crank - Crank-

shaft Will Not Rotate 

4

Test the battery positive cable between the battery and 
the starter solenoid for high resistance. 
Did you find and correct the condition?

Go to Step 8 

Go to Step 5

5

Test the ground circuit between the battery and the starter 
motor for a high resistance. 
Did you find and correct the condition?

Go to Step 8

Go to Step 6

SWITCH

STARTER

MOTOR

AMMETER

CARBON

PILE

12 VOLT

BATTERY

 

 

 

 

 

 

 

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