Hummer H2. Manual - part 1085

TESTING. Go to next step.  

2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel. 

Turn ignition switch RUN position. If scan tool powers up, go to next step. If scan tool does not power 
up, perform appropriate test. See appropriate BODY CONTROL MODULES article in ACCESSORIES 
& EQUIPMENT.  

3. Turn ignition switch to RUN position with each module on class 2 serial data circuit. If scan tool 

communicates with modules, go to next step. If scan tool does not communicate with any module, 
perform appropriate test. See appropriate BODY CONTROL MODULES article in ACCESSORIES & 
EQUIPMENT.  

4. Using scan tool, select DISPLAY DTCs function for each module on scan tool. Record all DTCs 

displayed, DTC status and module which set DTC. If scan tool displayed DTCs, go to next step. If scan 
tool did not display DTCs, repair charging system by symptom. See SYMPTOM INDEX table under 
SYSTEM TESTS.  

5. If scan tool displays DTCs which begin with "U", perform appropriate test in accordance with DTC 

retrieved. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If 
scan tool does not display DTCs which begin with "U", go to next step.  

6. If scan tool does not display any DTCs which begin with "P", go to next step. If scan tool displays any 

DTCs which begin with "P", perform appropriate test in accordance with DTC retrieved. See appropriate 
SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.  

7. If scan tool displays DTCs which begin with "B", perform appropriate test in accordance with DTC 

retrieved. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If 
scan tool does not display DTCs which begin with "B", perform appropriate test in accordance with 
DTCs retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .  

BENCH TESTING 

REMOVAL & INSTALLATION 

GENERATOR 

Removal & Installation 

NOTE:

Bench testing procedures are not available from manufacturer. 

WARNING:

Vehicles are equipped with air bag supplemental restraint system. Before 
attempting any repairs involving steering column, instrument panel or 
related components, see AIR BAG DEACTIVATION PROCEDURES in AIR 
BAG RESTRAINT SYSTEMS article in RESTRAINTS. 

CAUTION: When battery is disconnected, vehicle computer and memory systems 

may lose memory data. Driveability problems may exist until computer 
systems have completed a relearn cycle. See appropriate COMPUTER 
RELEARN PROCEDURES article in GENERAL INFORMATION before 
disconnecting battery. 

 

2004 Hummer H2 

2003-04 STARTING & CHARGING SYSTEMS Generators & Regulators - H2

  

Disconnect negative battery cable. Remove drive belt. Remove engine sight shield, if necessary. Disconnect 
generator harness connector. Slide protective boot down revealing terminal stud. Remove battery output BAT 
terminal nut. Disconnect battery output BAT cable. Remove generator mounting bolts. Remove generator. To 
install, reverse removal procedure. Tighten bolts to specification. See TORQUE SPECIFICATIONS .  

OVERHAUL 

GENERATOR SPECIFICATIONS 

SERVICE SPECIFICATIONS 

TORQUE SPECIFICATIONS 

TORQUE SPECIFICATIONS 

NOTE:

Generator is serviced by replacement only. 

Application 

Specification 

Generator Model 

Delphi AD244 

Rated Output 

145 Amps 

Load Test Output 

102 Amps 

Application 

Ft. Lbs (N.m) 

Engine Wiring Harness Auxiliary Negative Battery Cable Bolt 

12 (16) 

Engine Wiring Harness Ground Bolt 

12 (16) 

Engine Wiring Harness Ground/Negative Cable Bolt 

18 (25) 

Front Axle Mounting Bracket Nut 

70 (95) 

Generator Bracket Bolt 

37 (50) 

Generator Bolt 

37 (50) 

Negative Battery Cable Bolt 

13 (17) 

Positive Battery Cable Bolt 

13 (17) 

Starter Bolt 

37 (50) 

INCH Lbs.

Forward Light Wiring Harness Ground/Negative Cable Bolt 

80 (9) 

Front End Diagonal Brace Bolt 

80 (9) 

Generator Cable Nut 

80 (9) 

Ground Strap Nut 

80 (9) 

Positive Cable Nut 

80 (9) 

Positive Cable-At-Underhood Bussed Electrical Center (UBEC) Bolt 

80 (9) 

Starter Lead Nut 

30 (3.4) 

Surge Tank Bolt/Nut 

80 (9) 

Transmission Cover Bolt 

80 (9) 

 

2004 Hummer H2 

2003-04 STARTING & CHARGING SYSTEMS Generators & Regulators - H2

  

WIRING DIAGRAMS 

For 2003, see SYSTEM WIRING DIAGRAMS in ELECTRICAL.  

For 2004, see SYSTEM WIRING DIAGRAMS in ELECTRICAL. 

 

2004 Hummer H2 

2003-04 STARTING & CHARGING SYSTEMS Generators & Regulators - H2

  

2004 ELECTRICAL

Engine Electrical - Hummer H2 

SPECIFICATIONS 

FASTENER TIGHTENING SPECIFICATIONS 

Fastener Tightening Specifications 

BATTERY USAGE 

Battery Usage 

Application

Specification

Metric

English

Battery Cable Bracket Bolt

25 N.m

18 lb ft

Battery Cable Channel Bolt

12 N.m

106 lb in

Battery Hold Down Retainer Bolt

25 N.m

18 lb ft

Battery Tray Bolt

9 N.m

80 lb in

Battery Tray Nut

25 N.m

18 lb ft

Engine Wiring Harness Auxiliary Negative Battery Cable Bolt

16 N.m

12 lb ft

Engine Wiring Harness Ground Bolt

16 N.m

12 lb ft

Engine Wiring Harness Ground/Negative Cable Bolt

25 N.m

18 lb ft

Front Axle Mounting Bracket Nut

95 N.m

70 lb ft

Forward Lamp Wiring Harness Ground/Negative Cable Bolt

9 N.m

80 lb in

Front End Diagonal Brace Bolt

9 N.m

80 lb in

Generator Bracket Bolt

50 N.m

37 lb ft

Generator Bolt

50 N.m

37 lb ft

Generator Cable Nut

9 N.m

80 lb in

Ground Strap Nut

9 N.m

80 lb in

Negative Battery Cable Bolt

17 N.m

13 lb ft

Positive Battery Cable Bolt

17 N.m

13 lb ft

Positive Cable Nut

9 N.m

80 lb in

Positive Cable at Underhood Bussed Electrical Center (UBEC) Bolt

9 N.m

80 lb in

Starter Bolt

50 N.m

37 lb ft

Starter Lead Nut

3.4 N.m

30 lb in

Surge Tank Bolt/Nut

9 N.m

80 lb in

Transmission Cover Bolt

9 N.m

80 lb in

Base

Cold Cranking Amperage (CCA)

880 A

Reserve Capacity Rating

115 Minutes

Replacement Battery Number

79-6YR

 

2004 Hummer H2 

2004 ELECTRICAL Engine Electrical - Hummer H2

  

 

2004 Hummer H2 

2004 ELECTRICAL Engine Electrical - Hummer H2