Installation Method for Chery QQ 12V Alternator

I. Pre-installation Preparation

1. Tools and Materials Preparation

2. Vehicle and Component Inspection

1. Park the vehicle on a flat surface, engage the parking brake firmly, turn off the engine, disconnect the negative battery cable and wait 5–10 minutes to discharge residual power.

2. Verify that the alternator model/part number matches the Chery QQ vehicle’s OE specifications; confirm the rated voltage is 12V and the amperage matches the original equipment.

3. Inspect the alternator rectifier, diodes, stator/rotor for damage; check the drive belt for cracks and wear.

4. Clean oil stains and rust from the mounting surface, check the fixing bolt holes for stripped threads, ensure the battery is fully charged and the terminals are clean.

II. Installation Steps

1. Positioning and Pre-installation

1. Align the alternator mounting holes with the engine bracket, manually screw in 2–3 fixing bolts (do not fully tighten), and ensure the pulley is coplanar with the crankshaft/accessory pulleys.

2. Install the drive belt, and adjust the tension with a tensioner tool (the standard belt deflection for Chery QQ is 5–8mm, or follow the tensioner scale markings).

2. Tightening the Fixing Bolts

1. Use a torque wrench to tighten the bolts in a cross-symmetrical sequence in 2–3 steps. Torque specification: the fixing bolt torque for Chery QQ 12V alternator is 20–25N·m (refer to the vehicle-specific manual for exact values).

2. Ensure the belt has no misalignment, meets the tension requirements, and poses no slipping risk.

3. Electrical Wiring Connection

• Check that all connections are secure, and wrap exposed parts with insulating tape to prevent short circuits.

• Apply conductive paste to the wiring terminals and secure the wire harnesses with cable clips to avoid terminal detachment due to pulling forces.

4. Reconnection and Functional Testing

1. Reconnect the negative battery cable, apply battery terminal protector and tighten the terminal nut.

2. Turn the ignition switch to the ON position and confirm the charging indicator light turns off; start the engine, use a multimeter to measure the output voltage (it should be 13.5–14.8V), check for no abnormal noise, and ensure smooth belt operation.

3. Load test: Turn on high-load devices such as headlights and air conditioning; the voltage should remain stable at 13.2–14.5V with no fluctuations.

Precautions for Installation of Chery QQ 12V Alternator

I. Safety Precautions Before Installation

Power-off Operation Must Be Performed First

1. Prior to installation, be sure to disconnect the negative battery cable and wait for 5–10 minutes to ensure that the residual power in the vehicle's electrical system is completely discharged. This prevents electric arcs from occurring when plugging or unplugging wires, which could burn out the alternator voltage regulator or the vehicle's Electronic Control Unit (ECU).

2. Do not touch the alternator wiring terminals while the battery is connected to avoid the risk of electric shock; it is strictly prohibited to touch the B+ terminal and the alternator housing simultaneously with metal tools to prevent short circuits.

3. For Chery QQ models of certain production years, the battery is installed inside the passenger compartment. When disconnecting the negative cable, take care to avoid scratching the surrounding wire harnesses with tools.

Strict Verification of Component Compatibility

1. Confirm that the OE part number, rated voltage (12V) and rated current of the new alternator are fully compatible with the Chery QQ model. The amperage of the alternator for this model is typically 60–90A. Never replace it with an alternator of higher amperage to avoid overheating of the wire harness due to overload.

2. Check that the alternator pulley specifications (diameter and number of grooves) match those of the original equipment. Ensure the pulley bearing rotates smoothly without jamming or abnormal noise. The drive belt for this model is mostly of 3PK specification. It is recommended to replace the drive belt at the same time when replacing the alternator to avoid slipping caused by cracks in the old belt.

3. Verify the voltage regulator model. The alternators of Chery QQ are mostly equipped with built-in regulators. It is necessary to ensure that the regulator matches the impedance of the alternator stator coil to prevent excessively high or low charging voltage.

Requirements for Inspection of Mounting Surface and Surrounding Components

1. Thoroughly clean oil stains and rust from the surface of the alternator mounting bracket on the engine side. Sand the contact surface of the bracket with abrasive paper to ensure uniform force distribution after the alternator is fixed. Check the bracket for deformation or cracks and replace it if necessary.

2. The engine compartment space of Chery QQ is compact. Inspect the coolant hoses, fuel pipes and wire harnesses around the alternator for potential interference risks. Reserve a safety distance of ≥5mm to prevent component damage caused by vibration and friction during vehicle operation.

II. Technical Precautions During Installation

Standard Operation for Bolt Tightening

1. Tighten the fixing bolts in a cross-symmetrical sequence, gradually tightening them to the standard torque in 2–3 steps (the torque for Chery QQ 12V alternator fixing bolts is 20–25N·m). Never tighten the bolts on one side in a single step to avoid deformation of the alternator housing.

2. The bolts must be fitted with original factory lock washers. Do not use extended bolts to prevent thread slipping. After installation, shake the alternator to confirm there is no looseness or displacement.

3. References：
   

4. The core authority sources for these precautions are the Chery QQ Original Factory Maintenance Manual and QC/T 413-2002 Basic Technical Requirements for Automobile Electrical Equipment. The following is the complete source tracing and clause correspondence illustration.

6. I. Core Authority Sources

8. Source Name	Publisher	Core Basis	Obtaining Channels
   Chery QQ Original Factory Maintenance Manual (including chapters on mechanical and electrical systems of SQR473F/SQR473H engines)	After-sales Service Department of Chery Automobile Co., Ltd.	The dedicated chapter on alternator installation covers key parameters such as fixing bolt torque (20–25N·m), belt deflection (5–8mm), definitions and torque values of B+/D+ terminals (12–15N·m for the main terminal, 8–10N·m for the excitation terminal), and component compatibility requirements	Authorized Chery dealers, Launch X431/Autel maintenance databases, auto repair information platforms, etc.
   QC/T 413-2002 Basic Technical Requirements for Automobile Electrical Equipment	Former State Economic and Trade Commission (now the Ministry of Industry and Information Technology of the People's Republic of China), under the jurisdiction of the National Technical Committee for Standardization of Automobiles	Specifies installation fit tolerances, electrical connection safety requirements, component matching criteria and performance verification standards for alternators; supplements the specifications for post-installation reliability testing and fault judgment	National Public Service Platform for Standard Information, automotive industry standard databases such as ChineseStandard.net, etc.

10. II. Module-to-Source Corresponding Notes

12. Precaution Module	Corresponding Clauses in Authority Sources
    Power-off operation & component compatibility verification	Safety specification chapter of Chery Original Factory Manual, electrical safety and component adaptation clauses of QC/T 413-2002
    Cross-symmetrical bolt tightening & torque parameters	Torque specification chapter of Chery Original Factory Manual, installation and tightening requirements of QC/T 413-2002
    Belt tension adjustment (deflection of 5–8mm)	Mechanical installation parameter chapter of Chery Original Factory Manual, drive belt matching and tension standards of QC/T 413-2002
    Definition & torque requirements of electrical terminals	Electrical connection chapter of Chery Original Factory Manual, terminal connection specifications of QC/T 413-2002
    Post-installation testing process & fault judgment	Function verification chapter of Chery Original Factory Manual, reliability testing and fault judgment criteria of QC/T 413-2002

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