Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2007 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Starting and Charging: Locations
Engine Electrical Component Views
Engine Electrical Components
1 - Negative Battery Cable
2 - Battery
3 - Positive Battery Cable
4 - Generator
5 - Engine-LRR
6 - G120
7 - G100
8 - C130 (UE1)
9 - Generator Control Module
Engine Electrical Components 1 of 2
1 - Battery Positive Cable
2 - Starter Solenoid
3 - Starter Motor
4 - G100
5 - OnStar Fuse
6 - Battery
7 - Generator Connector
8 - Generator
Engine Electrical Components 2 of 2
1 - Ignition Switch
2 - Clutch Pedal (MA5)
3 - Clutch Release Switch (MA5)
4 - Clutch Start Switch (MA5)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.