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Type :
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ACgenerator Alternator
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Specification :
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12 volts and 80 amperes
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Pulley :
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5PK
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Brand :
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NUOJIN
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Number :
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31400-71L00，A005TG1191
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Quality :
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Remanufacture
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Delivery time :
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30DAY
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The installation method of the Mitsubishi 12V alternator is similar to that of general automotive alternators. The specific installation steps are as follows:
Prepare tools such as wrenches, screwdrivers, and pliers.
Disconnect the negative connection line of the storage battery to avoid electric shock or short circuit during installation.
Use a special tool to loosen the belt tensioner, then remove the belt.
First, remove the terminal from the contact bolt on the alternator output end, then press the lock catch to disconnect the wiring harness plug from the alternator terminal.
Use a socket wrench to remove the alternator fixing bolts, usually 1 at the top and 2 at the bottom.
Remove the old alternator from the engine bracket.
Place the new alternator stably in the original installation position and align the bolt holes.
Perform initial tightening with fixing bolts without fully securing them to leave space for subsequent belt tension adjustment.
Correctly insert the wiring harness plug into each terminal of the alternator according to the original position to ensure a firm connection. Generally, the alternator has terminals such as positive (B+) and negative (-), which should be correctly connected to the storage battery and vehicle circuit.
Fit the drive belt around the alternator pulley and the engine drive pulley, ensuring the belt is correctly installed in the pulley grooves without deviation. Then use a tool to adjust the alternator position to achieve appropriate belt tension.
Press the midpoint of the belt with your finger. According to the specific requirements of the Mitsubishi model, the deflection at the midpoint of the belt should generally be within a certain range. A belt tension gauge can also be used for precise measurement to ensure proper belt tension.
Use a torque wrench to tighten the alternator fixing bolts to the specified torque. The specific torque value can be found in the Mitsubishi vehicle maintenance manual.
Recheck that all wiring is secure, and the belt is correctly installed in the pulley grooves without loosening or deviation.
After confirmation, reconnect the negative connection line of the storage battery.
Start the Mitsubishi vehicle, let the engine idle, and observe whether the alternator works normally and if the charging indicator light turns off. At the same time, a multimeter can be used to measure the output voltage of the alternator; the normal range is generally 13.5-14.5V.
The key precautions for installing a Mitsubishi 12V generator are as follows:
Core Precautions for Electrical Connections
Before wiring, the negative terminal of the battery must be disconnected, and wait for 2-3 minutes for the Mitsubishi electronic control system to fully discharge to prevent short - circuits that could burn out the ECU, generator rectifier, or wiring harness.
Clearly distinguish the functions of the terminals: B+ (output positive), F/D+ (excitation terminal), and G (ground). Check the terminal definitions against the repair manual of the corresponding Mitsubishi model. It is strictly prohibited to connect them incorrectly or reversely. Reversing the excitation wire may directly damage the voltage regulator.
Standardize terminal processing: Use fine - grit sandpaper to polish the oxidized layers of the generator terminals and wiring harness connectors. Connect them with crimping terminals or plugs of the original Mitsubishi specifications, and wrap the connection points with multiple layers of high - temperature - resistant insulating tape to avoid water ingress or poor contact.
Key Requirements for Mechanical Installation
The generator model must fully match the specific Mitsubishi model (such as Pajero, Outlander, Lancer, etc.) and its year. Pay special attention to checking the installation bracket hole positions, pulley pitch circle diameter, keyway size, and fixing bolt specifications to avoid forced assembly that could cause component deformation.
Tighten the fixing bolts according to the original Mitsubishi torque (usually 25 - 35N・m, subject to the specific model manual), and be sure to install lock washers to prevent the bolts from loosening due to vibration during vehicle operation, which could lead to generator displacement or belt slippage.
The belt tension must strictly follow the original factory standards: The belt deflection varies slightly among different Mitsubishi models, generally 10 - 15mm (subject to the manual), and a tension meter should be used for detection. If the tension is too loose, it is easy to slip and wear; if it is too tight, it will increase the bearing load and shorten the service life.
Debugging and Safety Operation Specifications
Before starting the engine, double - check whether all wiring is secure and whether the belt is correctly seated in the pulley groove. After confirming that there are no errors, reconnect the negative terminal of the battery. It is prohibited to plug and unplug the wiring harness or touch the terminals with electricity throughout the process.
After starting, let the engine run at idle for 5 - 10 minutes: Observe whether the generator operates normally, whether there are any abnormal vibrations or noises. Use a multimeter to measure the output voltage (the normal range is 13.5 - 14.5V), and the fluctuation should not exceed ±0.5V under load (when the lights, air - conditioning, etc. are turned on).
Avoid tools colliding with the generator housing during the installation process to prevent damage to the internal stator and rotor windings, which could affect the power generation efficiency.
Key Points for Subsequent Use and Maintenance
Regularly check within the first 300 kilometers after installation: Check whether the belt tension has decreased, and whether the fixing bolts and wiring terminals are loose, and tighten and adjust them in a timely manner. Before restarting a vehicle that has been parked for a long time, check the belt condition first.
Avoid overloading the generator: It is prohibited to privately install high - power electrical equipment. The generator power adaptability of some Mitsubishi models is limited, and overloading will lead to overheating and burnout or insufficient power generation.
Troubleshoot faults in an orderly manner: When problems such as a constantly - on charging indicator light or abnormal voltage occur, give priority to checking the wiring harness connectors, belt tension, and fuses. It is recommended that professional Mitsubishi technicians perform the maintenance of internal components, and non - professionals are prohibited from disassembling them.
References：It is impossible to clearly identify which specific "paragraph" you are referring to based on the provided content. Judging from your previous questions and the provided content, the content regarding the installation precautions for Mitsubishi 12V generators mainly comes from platforms such as Qiche Dashi and PCauto.
For example, the relevant articles on Qiche Dashi mention that the car power supply should be disconnected before operating the generator circuit, and care should be taken not to damage the housing or surrounding components when disassembling and installing the generator. The content of PCauto Encyclopedia involves the identification and connection of 12V generator terminals and other precautions.
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