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Type :
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Alternator
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Specification :
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12V 180A
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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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0009063622
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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 installation process of the 12V generator is roughly similar across different Mercedes-Benz models. The core principle is to follow the reverse order of removal, and some models require matching and initialization with special equipment after installation. Below is the general installation method; it is recommended to refer to the corresponding vehicle's repair manual during operation:
Turn off the vehicle engine and disconnect the negative terminal of the battery. If the power will be disconnected for an extended period, use a memory saver to protect the vehicle's on-board system settings and avoid parameter loss. Prepare tools such as wrenches, sockets, torque wrenches, OBD scanners, and voltmeters.
Ensure the new generator is an original Mercedes-Benz part or a compatible model. Clean the wiring terminals of the new generator and the dust and oil stains at the installation location to ensure good contact. For some models, it is necessary to remove obstructing components first — for example, the gasoline engine of the Mercedes-Benz W203 requires removing the air filter housing or air intake duct, while the Mercedes-Benz R320 needs removing the left and right air intake pipes and electric fan to free up space for installation.
Place the new generator stably at the installation location, align it with the bolt holes, and install the fixing bolts without fully tightening them to facilitate subsequent fine-tuning. For engines like the Mercedes-Benz M272, install the long bolts first, then the top bolts and brackets, and tighten them to the specified torque later.
Connect the electrical circuits: first connect the plug on the back of the generator, then fasten the positive cable terminal. Some models also have a ground wire. Use a wrench to tighten the wiring terminals to a torque of approximately 5nm to prevent loose connections and sparking, and finally put the protective cover on the terminals.
Install the drive belt: refer to the belt routing mark in the engine compartment and fit the belt over the generator pulley and other corresponding pulleys. Use a wrench to pull the belt tensioner and adjust it to the appropriate tension — the belt should deflect 1-2 centimeters when pressed. Excessively loose belts are prone to slipping, while overly tight belts can wear out the bearings.
Use a torque wrench to tighten the generator fixing bolts to the torque specified for the model. For example, the Mercedes-Benz W203 requires tightening to 42nm. After completion, recheck that the generator is secure and free of wobbling.
For some Mercedes-Benz models such as the GL350 and E350, connect an OBD scanner to the vehicle, access the control system, find the "Generator Settings" or "Electrical System Initialization" option, enter parameters such as the output current of the new generator, and then perform calibration in the BMS module to ensure the system recognizes the new generator.
Reconnect the negative terminal of the battery, start the vehicle, and use a voltmeter to measure the output voltage. The normal output should be between 13.5V and 14.5V.
Check that no charging fault light is illuminated on the instrument panel and that the generator makes no abnormal noise during operation. A short test drive can be conducted to perform a dynamic test and confirm the normal operation of the power generation system.
The core precautions for installing the 12V generator in Mercedes-Benz vehicles focus on safety protection, installation accuracy, electrical matching, and subsequent testing to avoid damaging the vehicle or the generator:
Disconnect the negative terminal of the battery throughout the entire installation process. Live operation is strictly prohibited to prevent short circuits and sparking during wiring.
When removing or installing obstructing components (such as electric fans and air intake ducts), avoid colliding with sensors and wire connectors. Handle fragile parts with care.
Wear gloves during operation to avoid direct contact between hands and the metal parts of the generator pulley and wiring terminals, preventing oil contamination or electric shock.
Tighten the fixing bolts to the torque specified for the corresponding model (usually 40-50nm, subject to the repair manual). Loose bolts will cause the generator to wobble, while over-tightening may lead to thread stripping or bracket damage.
The drive belt routing must strictly match the marks in the engine compartment. Incorrect routing will result in belt slipping, breakage, or failure to drive the generator properly.
Control the belt tension to a deflection of 1-2 centimeters. Insufficient tension is prone to abnormal noise, and excessive tension may burn the generator bearings or damage the belt.
Do not reverse the wiring order: first connect the generator plug, then fasten the positive cable terminal, and finally connect the ground wire (if equipped). This avoids direct contact between positive and negative terminals causing short circuits.
Ensure wiring terminals are clean and free of oil. After tightening, install the protective cover to prevent water ingress and oxidation that can lead to poor contact.
Never reverse the positive and negative connections. Doing so will burn core electrical components such as the generator rectifier, on-board fuses, or ECU.
For Mercedes-Benz models equipped with BMS (Battery Management System) (such as most new E-Class, S-Class, and GL-Class), special OBD scanner initialization is mandatory after installation. Without this, the vehicle cannot recognize the new generator, leading to illumination of the charging fault light and abnormal power generation efficiency.
After starting the vehicle, use a voltmeter to check the output voltage (13.5-14.5V is normal). If the voltage is too high or too low, inspect the wiring, belt tension, or the generator itself for quality issues.
Conduct a 5-10 minute test run after installation. Ensure the generator has no abnormal noise or overheating, and no fault warnings appear on the instrument panel before conducting a short test drive for final confirmation.
Select an original Mercedes-Benz generator or a compatible model to avoid electrical system malfunctions caused by mismatched power or interfaces.
If coolant or air conditioning pipelines were removed during disassembly, check for leaks after installation and replenish the corresponding fluids if necessary.
If you lack repair experience (especially in OBD matching operations), it is recommended to entrust the work to a professional Mercedes-Benz repair shop to avoid secondary damage from improper installation.
References：
The core precautions for installing the 12V generator in Mercedes-Benz vehicles, which you previously inquired about, are not derived from a single official document or fixed source. Instead, they are synthesized from key points in the repair manuals of multiple Mercedes-Benz models, professional summaries from automotive repair platforms, and core content of overseas automotive repair tutorials. The specific source explanations are as follows:
Details such as the requirement to tighten the generator mounting bolts to 42nm and the wiring terminals to approximately 5nm for the Mercedes-Benz W203 are consistent with the installation tutorials for the Mercedes-Benz W203 generator on the Карпедия website and the generator disassembly and assembly instructions on AutoManuals.biz. Additionally, the reminder that the drive belt must follow the routing marks in the engine compartment can be found in the Mercedes-Benz generator replacement tutorials on the It Still Runs website.
Key precautions, such as the need for initialization and matching with an OBD scanner after installation and the normal output voltage range of 13.5 - 14.5V, are highly consistent with the operation specifications for Mercedes-Benz generator matching on the Qiche Dashi (Automotive Master) platform. The platform also emphasizes important notes like prioritizing original equipment manufacturer (OEM) parts and prohibiting reverse wiring, which corroborate the previously summarized content.
Practical precautions from multiple short videos demonstrating Mercedes-Benz generator replacement on Douyin (TikTok China) have been integrated into the summary. Examples include preliminary operations such as disconnecting the negative terminal of the battery before disassembly and removing air intake hoses for certain models, as well as reminders to avoid colliding with sensors and wire connectors.
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