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Type :
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Alternator
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Specification :
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12V 130A
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Pulley :
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6PK
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Brand :
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NUOJIN
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Number :
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1800A432
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Quality :
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Remanufacture
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Delivery time :
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30 days
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The Mitsubishi 12V 130A alternator is mostly suitable for passenger cars, light commercial vehicles and other models under Mitsubishi. Its installation process is consistent with the core logic of automotive alternators of the same specification, focusing on power-off protection, accurate fixation, standardized wiring and belt tension adjustment. Below is a universal installation method applicable to most compatible models; specific details can be adjusted with reference to the vehicle's service manual:
Turn off the vehicle engine and remove the key. Disconnect the negative cable of the storage battery to eliminate the risk of electrical short circuits during installation. Wear insulated gloves and safety goggles to avoid scratches from sharp components in the engine compartment or electric shocks.
Prepare tools such as a socket wrench set, torque wrench, cleaning rags, insulating tape, and a multimeter. Meanwhile, inspect the new 12V 130A alternator for no external damage or rust on the wiring terminals, and verify that the mounting holes and pulley specifications are compatible with the vehicle. If replacing an old alternator, clean the oil stains on the surface of the new alternator.
Use a wrench to pry the belt tensioner. Once the tension is released, remove the drive belt. Check the belt for wear; if cracks are present, replace it simultaneously.
Mark the connection positions of the wires on the old alternator to avoid confusion during subsequent wiring. Then disconnect the wiring connector and output cable.
Unscrew the anchor bolts fixing the old alternator, carefully remove the alternator, and clean the dust and oil stains at the mounting position with a rag to ensure the mounting surface is flat and clean.
Place the new alternator steadily into the mounting position and align it with the bolt holes on the base. Initially tighten the mounting bolts without fully securing them, leaving room for subsequent belt tension adjustment. Most compatible models are equipped with 2 mounting bolts for the alternator; the recommended tightening torque is 25 - 35N·m, and the specific value shall be subject to the vehicle's service manual.
Mitsubishi 12V alternators are commonly equipped with core terminals such as B+ and S. Wire strictly according to the previously marked positions. Connect the B+ terminal to the positive pole of the storage battery using a thick-gauge wire to ensure stable high-power supply. The S terminal is connected to the charging warning light on the instrument panel; some models are equipped with an IG terminal, which needs to be connected to the ignition switch circuit. After wiring, tighten the terminal nuts and wrap the exposed connectors with insulating tape. Meanwhile, check for no damage or aging of the wires to avoid component burnout caused by reverse wiring.
Fit the drive belt accurately onto the alternator pulley and the corresponding engine pulley, then adjust the tension by operating the belt tensioner. The adjustment standard is that pressing the middle of the belt by hand should allow a smooth deflection of 1 - 2 centimeters. Excessively loose tension may cause slipping and affect power generation efficiency, while excessively tight tension will accelerate the wear of the alternator bearings and the belt. For pulley transmission, ensure that the center planes of the alternator pulley and the corresponding component pulley are on the same plane.
After confirming that the belt tension meets the standard, use a torque wrench to evenly tighten the alternator mounting bolts in a diagonal sequence to ensure no wobble of the alternator body. Recheck that all wiring connectors are firmly plugged in, terminals are not loose, and the belt is free from misalignment or jamming. Meanwhile, verify that accessories such as the fan cover are properly installed without the risk of colliding with the rotor.
Reconnect the negative cable of the storage battery. After starting the vehicle, observe whether the charging indicator light on the instrument panel turns off normally. Use a multimeter to measure the output voltage of the alternator; the normal output range for the 12V 130A specification is usually 13.5 - 14.5V. In addition, listen for no abnormal noises such as sharp friction or loud rumbling during the alternator's operation. If all indicators are normal, the installation is completed. If abnormalities occur, turn off the engine immediately to inspect the wiring or belt.
Based on the structural characteristics of the Mitsubishi 12V 130A alternator (such as high-power output and dedicated terminal design) and the electrical system features of Mitsubishi models, additional precautions must be observed during installation to prevent component damage or electrical failures:
Thorough Power Disconnection: After disconnecting the negative battery cable, wait 5-10 minutes to allow full discharge of the alternator's internal regulator and vehicle circuit capacitors. This prevents short circuits or electronic component burnout caused by residual current (some Mitsubishi models have large-capacity circuit capacitors, requiring extended discharge time).
Prohibited Improper Boosting/Charging: If external battery boosting is needed post-installation, strictly follow the "positive-to-positive, negative-to-vehicle body ground" principle. Never connect an external battery directly to alternator terminals. When using a fast charger, disconnect the battery from the vehicle circuit first—fast-charging current must not flow through the alternator.
Mandatory Protective Gear: Wear insulated gloves and safety goggles throughout. In some Mitsubishi models, the alternator is installed adjacent to the exhaust manifold; wait for components to cool after engine shutdown to avoid high-temperature burns.
Strict Specification Matching: The new alternator must meet 12V voltage and 130A power requirements, and match the original vehicle in mounting hole spacing, pulley diameter/groove count. Ensure the alternator's mounting feet fully fit the engine bracket (some Mitsubishi models use dedicated brackets; universal alternatives may cause instability).
Standard Tool Usage: Tighten mounting bolts with a torque wrench per the vehicle service manual (typically 25-35N·m). Avoid excessive force to prevent thread stripping or housing cracks. Store removed bolts/washers by position; some Mitsubishi alternator bolts have lock washers that must be reinstalled.
Belt Selection Guidelines: The drive belt must match the alternator pulley specifications—oversized/undersized belts impair tension adjustment. Prioritize Mitsubishi OEM or equivalent belts to avoid reduced efficiency or abnormal noise from substandard belts.
Terminal Wiring Prohibition: The B+ terminal of the Mitsubishi 12V 130A alternator must use ≥6mm² thick wire connected to the battery positive terminal, secured with a lock nut to prevent overheating/ablation during high-power output. Strictly align S/IG terminals with original wiring (no cross-connection). The IG terminal of some models is ignition switch-controlled; reverse connection disables alternator excitation.
Insulation & Protection: Ensure no exposed metal on terminals post-wiring; wrap connectors with insulating tape and secure the B+ terminal's rubber cover. Replace damaged/aged wires immediately—temporary insulation tape repairs are prohibited (high-power operation generates large currents, risking overheating/fire with aged wires).
No Unauthorized Modifications: Do not alter alternator polarity, add extra loads, or short-circuit terminals for testing. Such actions damage core components (rectifier bridge, regulator) due to Mitsubishi alternators' high electronic integration and weak overload resistance.
References：
The precautions for installing the Mitsubishi 12V 130A alternator previously provided are not derived from a single exclusive official technical document of Mitsubishi or a sole authoritative source. Instead, they are compiled by integrating universal installation standards of the automotive industry, the maintenance characteristics of alternators for Mitsubishi models, as well as information from multiple automobile - related platforms and accessory specifications. The core reference bases are as follows:
Universal Industry Standards for Alternator Installation
General guidelines for alternator installation released on platforms like Motor Circle clearly specify key points. These include verifying nameplate parameters prior to installation, accurately aligning the pulley during the installation process, tightening fixing bolts in a diagonal sequence, and conducting insulation and no - load tests after installation. In addition, content related to Mitsubishi alternator installation on NetEase also mentions the necessity of complying with electrical safety norms and conducting proper commissioning and testing. All these serve as crucial references for the basic requirements in the precautions, such as safe operation, belt tension adjustment and bolt tightening.
General Knowledge on Alternator Maintenance
Content similar to alternator maintenance manuals collected on platforms like Wenku8 covers common requirements. These involve cutting off power to prevent short circuits, avoiding unauthorized battery boosting, implementing insulation protection for electrical circuits, and disconnecting circuits during welding operations. These requirements are consistent with the content regarding circuit protection and operations under special scenarios in the precautions, providing general maintenance logical support for relevant key points.
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