Alternator Alternador for JAC JFZ1828 1025100GG010 1800A211 JFZ1929L

Pre-installation Preparation

• Tool and Accessory Preparation: Prepare tools including wrenches, sockets, and screwdrivers. Verify that the model of the new 12V generator is compatible with the vehicle. Check that the generator housing is free of damage and the terminal blocks are free of oxidation. Ensure all required installation accessories such as fixing bolts are complete.

• Safety Protection Operations: Turn off the vehicle engine, remove the key, and disconnect the negative connection wire of the car battery. This avoids short circuits, electric shocks, or damage to electronic components during installation.

• Clean the Installation Area: If an old generator was just removed, use a cloth to clean dust, oil, and debris from the installation position. Ensure the mounting surface is flat and clean to reduce vibration or malfunctions caused by poor contact of the generator later.

Core Installation Operations

• Preliminary Fixation of the Generator: Place the new generator stably in the installation position in the engine compartment. Align it with the bolt holes and initially fix it with fixing bolts without fully tightening—reserve space for subsequent belt tension adjustment.

• Standardized Wiring Connection: Connect the generator wires according to the recorded wire positions during disassembly or refer to the vehicle wiring diagram. Distinguish between positive and negative wires. Insert the generator's output wires, control wires, etc., into the wiring harness connectors correspondingly. Ensure each connector is fully plugged in to avoid poor contact or sparking due to loosening.

• Belt Installation and Tension Adjustment: Accurately fit the drive belt onto the generator pulley and engine pulley. Adjust the tension using the belt tensioner. Press the middle of the belt by hand—if it can sink about 10-15mm, the tension is appropriate. An overly loose belt may slip and affect power generation; an overly tight one will accelerate wear on the belt and generator bearings.

• Tighten All Bolts: After confirming the belt tension meets the standard and wiring is correct, use a wrench to fully tighten the generator's fixing bolts in a diagonal and uniform manner. Prevent bolt loosening due to vibration during operation.

Final Inspection

• Restore the Circuit and Conduct Initial Check: Reconnect the negative connection wire of the battery. Inspect all wire connectors and bolts to confirm there is no loosening or incorrect connection.

• Start-up Test: Start the vehicle and observe the charging indicator light on the instrument panel. If the indicator light goes out, the generator is working normally. Simultaneously, simply test the vehicle's electrical equipment such as lights and air conditioning to check for stable operation. If abnormal noise occurs or the indicator light remains on, turn off the engine immediately and inspect the belt tension or wiring connections for issues.

1. Safety Operation Bottom Lines

• Disconnect the battery’s negative terminal first before the entire installation process. Live working is strictly prohibited to avoid short circuits that may burn the generator regulator or the vehicle’s electronic control system.

• Avoid tools touching exposed wires or sensors in the engine compartment during operation to prevent circuit damage or signal interference.

• If the engine needs to be started for testing during installation, ensure hands and clothing are kept away from rotating parts such as pulleys and fans to prevent entanglement and injury.

2. Compatibility and Installation Accuracy Requirements

• The generator model must match the vehicle’s original factory specifications to avoid abnormal charging or damage to the electrical system due to mismatched voltage and power.

• Use original specifications or accessories of the same strength grade for fixing bolts. Tighten them following the diagonal and uniform principle with moderate force—preventing loosening while avoiding bolt thread stripping.

• Clean the mounting surface thoroughly to ensure the generator fits tightly with the mounting bracket, free of skew or gaps, so as to reduce vibration and noise during operation.

3. Standardized Wiring Connections

• Wire strictly according to the vehicle’s wiring diagram or the records made during disassembly. Distinguish between the output wire (B+), excitation wire (F), etc., and strictly prohibit reverse connection of positive and negative poles.

• Ensure wiring terminals are fully inserted in place. If there is an oxide layer on the terminals, clean it in advance; apply conductive paste if necessary to avoid overheating or sparking caused by poor contact.

• Route wires away from the engine’s high-temperature areas (such as the exhaust pipe) and moving parts. Secure excess wires with cable ties to prevent wear and insulation damage.

4. Belt Tension and Transmission System

• Strictly control the belt tension to the standard of "sinking 10-15mm when pressed in the middle". An overly loose belt is prone to slipping, producing abnormal noise and reducing power generation efficiency; an overly tight one will lead to premature bearing damage.

• Before installing the belt, check the pulley surface for cracks and oil contamination. If the belt is aged or cracked, replace it simultaneously to avoid breakage during use.

• If the vehicle is equipped with an automatic tensioner, confirm it works normally without jamming to ensure the belt maintains appropriate tension for a long time.

5. Post-installation Inspection Key Points

• After the first start, first observe whether the charging indicator light goes out normally. At idle speed, measure the battery voltage with a multimeter—normal voltage should be between 13.5-14.5V.

• During operation, pay attention to whether the generator has abnormal noise, vibration, peculiar smell, or overheating. Stop the engine immediately to troubleshoot if any issues are found.

• Recheck the bolt tightness and belt tension within a short period after installation (e.g., after driving 10-20 kilometers) to timely remedy minor loosening from the installation.

References：

• Qiche Dashi (Auto Master): This platform has published multiple articles related to generator installation for different JAC models, such as JAC trucks, JAC Heyue, JAC Refine commercial vehicles, and JAC Ruiling. The content includes not only basic installation steps but also clearly specifies precautions like disconnecting the power supply, handling components with care, matching the generator model, and checking the integrity of wires. It is an important information source for relevant installation precautions.
• PCauto: This website features popular science content on general installation processes, disassembly details, and wiring specifications for automotive generators. Content such as belt tension adjustment during installation, requirements for secure wiring terminals, and operations to disconnect and reconnect the battery’s negative terminal before and after installation is highly consistent with the installation precautions for general automotive generators like the JAC 12V generator, and can serve as a practical reference basis.
• Autohome: This platform collects content such as wiring steps for automotive generators and post-installation testing methods. Among them, precautions regarding wiring sequence, insulation treatment, and post-installation voltage detection are general guidelines for the installation of 12V generators in most models including JAC Motors, providing supplementary references for relevant precautions.