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.
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HOMESERVICE MANUALSCHEVROLET2009IMPALA V8-5.3LREPAIR AND DIAGNOSISSTARTING AND CHARGINGCHARGING SYSTEMALTERNATORSERVICE AND REPAIRGENERATOR REPLACEMENT
2009 Chevrolet Impala V8-5.3L
Generator Replacement
2009 Chevrolet Impala V8-5.3LSECTION Generator Replacement
Generator Replacement (LS4-5.3L)
Removal Procedure
1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (RPO LS4) (Service and Repair)Battery Negative Cable Disconnection and Connection (RPOs LZE/LZ4/LZ8) (Service and Repair).
2. Remove the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement (Service and Repair).
3. Remove the drive belt. Refer to Drive Belt Replacement - Accessory (Service and Repair).
4. Disconnect the generator electrical connector (2).
5. Position aside the protective boot (1) from the generator output BAT terminal for access.
6. Remove the generator output BAT terminal nut (4) and remove the positive battery lead (3) from the generator.
7. Remove the generator bolts and generator.
Installation Procedure
Caution: Refer to Fastener Caution (Fastener Caution).
1. Install the generator and bolts.
Tighten the bolts to 50 Nm (37 lb ft).
2. Install the positive battery lead (3) and generator output BAT terminal nut (4) to the generator.
Tighten the nut to 20 Nm (15 lb ft).
3. Position the protective boot (1) to the generator output BAT terminal.
4. Connect the generator electrical connector (2).
5. Install the drive belt. Refer to Drive Belt Replacement - Accessory (Service and Repair).
6. Install the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement (Service and Repair).
7. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (RPO LS4) (Service and Repair)Battery Negative Cable Disconnection and Connection (RPOs LZE/LZ4/LZ8) (Service and Repair).
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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.