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Type :
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ACgenerator Alternator
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Specification :
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12V 110A
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Pulley :
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7PK
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Brand :
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nuojin
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Number :
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A003TG229 MN163999 MD341353
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Quality :
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Remanufacture
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Delivery time :
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10 day
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The installation of the 12V generator in Mitsubishi vehicles mostly follows the principle of "reverse disassembly". Only minor differences exist in component fixing details among different models (such as those equipped with common engines like the 4G18). Below is a universal installation procedure tailored to the characteristics of Mitsubishi models, which can be adjusted with reference to the specific vehicle's service manual during operation:
Allow the engine to cool down for more than 30 minutes to avoid scalds from high temperatures. Disconnect the negative battery cable to prevent circuit short circuits that could damage components.
Prepare tools including wrenches, a torque wrench, pliers, rags, and insulating tape. Meanwhile, confirm that the new 12V generator is compatible with the vehicle model, focusing on verifying the voltage regulator specifications and pulley groove count. If the pulley of the new generator is incompatible, remove the pulley from the old generator and install it on the new one.
Use a rag to wipe off oil stains and rust from the generator mounting bracket and wiring terminals in the engine compartment. If the bracket has cracks or the positioning pin is deformed, replace it immediately.
Additionally, inspect the new generator to ensure the bearings rotate smoothly and the carbon brush wear does not exceed 1/3 of the original length, avoiding abnormal noise or power generation failures after installation.
Open the hood and locate the generator mounting position next to the engine. Align the new generator with the fixing holes on the mounting bracket, place it in the correct position, then initially screw in the matching bolts into the fixing holes to temporarily secure the generator. Do not fully tighten the bolts to reserve space for subsequent adjustments.
Locate the B+ terminal of the generator, slide the ring terminal of the corresponding vehicle cable over the terminal, and tighten the fixing nut. Ensure the crimped surface of the terminal is kept away from the generator housing to prevent poor contact.
Then, insert the generator wiring harness connector smoothly and fasten the buckle; do not insert or pull it forcefully to avoid damaging the connector. Organize the wiring harness and clip it into the fixing buckles, keeping it away from moving parts such as belts and fans.
In addition, some Mitsubishi models are equipped with dedicated terminals such as F (field) and E (ground) on the generator, which must be connected according to the vehicle's wiring marks. Never confuse or misconnect them, especially do not directly connect the positive battery voltage to the F terminal, as this will burn out the voltage regulator.
Follow the winding path of the old belt, use a special tool to pry the automatic belt tensioner counterclockwise. Once the tension is released, fit the belt onto the generator pulley and slowly release the tensioner.
Afterwards, check the belt tension: a reasonable deflection when pressing the midpoint of the belt is acceptable. Excessive tension will accelerate bearing wear, while insufficient tension may cause the belt to slip. At the same time, confirm that the belt fits the pulley without deviation.
According to the requirements of the corresponding Mitsubishi model, tighten all mounting bolts of the generator in the specified sequence. If the mounting bracket is made of aluminum, the bolt torque should be 20%-30% lower than that for cast iron brackets. It is recommended to use a torque wrench to avoid bracket cracking or thread stripping due to excessive torque.
First connect the positive battery cable, then the negative cable. A small amount of general-purpose grease can be applied to the terminals to prevent rust.
After starting the vehicle, observe whether the generator warning light on the dashboard turns off. If it remains on, troubleshoot wiring errors or installation issues.
Use a multimeter to measure the voltage at the generator's B terminal; the normal range at idle is 13-15V. Let the vehicle run for 5-10 minutes, confirm that the generator has no abnormal noise or vibration, and that power generation is stable. The installation is then complete.
When installing the 12V generator of Mitsubishi vehicles, it is crucial to focus on core aspects such as safety standards, component compatibility, and circuit connections, while avoiding common risks like improper torque and incorrect wiring harness connections. Combined with the structural characteristics of Mitsubishi models, the specific precautions are as follows:
Ensure the vehicle is turned off and the key is removed throughout the entire process. Wait for the engine compartment to cool down for more than 30 minutes before disconnecting the negative battery terminal to prevent scalds from high-temperature components (such as the exhaust manifold) or circuit short circuits.
Wear gloves and safety goggles during operation. The engine compartment is densely wired; avoid scratching the insulation layer of wires with tools or touching heat-prone components like turbochargers and high-temperature pipelines.
Strictly follow the sequence of "disconnect the negative terminal first, reconnect the negative terminal last" when disconnecting or connecting the battery. For some models equipped with an ECU (Electronic Control Unit), confirm there are no unsaved fault codes before powering off to prevent loss of electronic data.
The new generator must be fully compatible with the vehicle model and engine type. Focus on verifying the voltage regulator specifications, pulley groove count, and diameter. For example, generators for 4G18 and 4G63 engines cannot be interchanged—an incompatible pulley will cause transmission failure or abnormal belt wear.
Before installation, check that the new generator's bearings rotate smoothly and the carbon brush length meets the standard (wear does not exceed 1/3 of the original length). Meanwhile, clean rust and debris from the mounting bracket and positioning holes. If the bracket has cracks or the positioning hole is deformed, replace it immediately to avoid vibration during operation.
When reusing old bolts, inspect the integrity of the threads. Most Mitsubishi models use fine-thread lock bolts; replacement with ordinary coarse-thread bolts is strictly prohibited. The bolt torque for aluminum brackets should be 20%-30% lower than that for cast iron brackets to prevent thread stripping or bracket cracking.
References：
The installation method and precautions for Mitsubishi's 12V generator you previously inquired about do not come from a single source. Instead, they are integrated from multiple types of content, including official service manuals for relevant Mitsubishi models and practical operation summaries from professional automotive maintenance platforms. The specific source categories are as follows:
This serves as the core reference basis. For example, the service manuals for Mitsubishi Heavy Industries models such as the S4S and S4Q include dedicated chapters on the assembly and installation of 12V generators. These chapters detail key technical details during generator assembly, such as heating the rear bracket to 50-60℃ before pressing the rear bearing onto it, and adjusting the drive belt tension after installation. These provisions provide authoritative specifications for the core operations in the installation process.
The maintenance experience shared on these platforms supplements numerous practical details tailored to Mitsubishi models. For instance, content related to the generator of Mitsubishi's 4G18 engine on Auto Master not only sorts out simplified practical steps for generator removal and installation but also reminds users to disconnect the vehicle power supply before operation and avoid damaging surrounding components—all of which are summarized from the practical experience of maintenance technicians. NetEase has also published articles on Mitsubishi generator installation, covering general steps such as bracket mounting, cable connection, and post-installation commissioning, filling the gaps in popular practical guidance that may be missing from official manuals.
Popular science content from industry platforms such as PCauto and Autohome provides supplementary references. For example, the content on 12V generator terminal identification and wiring specifications in PCauto's automotive encyclopedia corresponds to the operating guidelines for the wiring link of Mitsubishi's 12V generator. Autohome's detailed introduction to Mitsubishi's 4G series engines also offers model compatibility references for the installation of generators adapted to this engine series, helping to clarify key model-matching points during installation.
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