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Type :
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ACgenerator Alternator
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Specification :
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24V 100A
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Pulley :
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2PK 8PK 9PK
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Brand :
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NUOJIN
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Number :
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0120468143 A0101548902
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Quality :
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NEW
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Delivery time :
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10DAY
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Most Mercedes-Benz models follow a roughly consistent installation process for their 24V generators, with core links including pre-installation preparation, core installation, system matching, and post-installation testing. Additionally, special attention must be paid to the computer matching step for some luxury models. Below is a detailed installation method:
Prepare tools such as socket wrenches, torque wrenches, insulated gloves, Mercedes-Benz-specific OBD scanners, and on-board memory retainers. Prioritize original Mercedes-Benz or authorized certified 24V generators. Meanwhile, a new drive belt can be prepared together—usually, when the generator needs replacement, the belt is also near its wear limit.
Park the vehicle on a flat road and pull the handbrake tightly. Turn off all on-board electrical devices before disconnecting the negative battery terminal. If the power will be disconnected for more than 30 minutes, connect an on-board memory retainer to prevent data loss from systems such as the on-board computer and seat memory. Wait for high-temperature components like the exhaust pipe in the engine compartment to cool down, then clean the dust and oil around the generator's installation location.
Place the new generator accurately in the original installation position, align the bolt holes, and initially tighten the fixing bolts by hand for positioning. Then use a torque wrench to fasten the bolts to Mercedes-Benz's specified torque— the reference value is mostly 42N・m, but specific values must be based on the corresponding vehicle's service manual. This avoids vibration caused by loose bolts or damage to the generator housing due to over-tightening.
Mercedes-Benz 24V generators typically have four terminals: B+, D+, W, and E. Among them, B+ connects to the positive battery terminal, D+ to the positive regulator terminal, W to the negative regulator terminal, and E to the negative terminal of the engine/vehicle body. Clean the oxide layer and rust on the connectors before wiring; repair any damaged wire insulation if found. Clearly distinguish each terminal to prevent electrical component burnout due to reverse connection. After wiring, fasten the fixing nuts of the output cables to ensure a secure connection.
Use a socket wrench to pry the belt tensioner to rotate clockwise, creating slack for the belt. According to the belt routing diagram marked inside the engine hood, accurately fit the belt onto the generator pulley and other corresponding pulleys. Adjust the belt tension so that pressing the middle of the belt produces a 1-2 cm depression. At the same time, ensure the belt fits the center of the pulley groove to prevent deviation or slipping during operation.
This is a critical step for installing generators in Mercedes-Benz models. Connect a professional OBD scanner that meets Mercedes-Benz technical requirements to the vehicle, access the vehicle control system, find the "Generator Settings" or "Electrical System Initialization" option, and enter parameter information such as the output current of the new generator. Then access the Battery Management System (BMS) module to complete calibration, ensuring the system can accurately identify the battery status and charging conditions.
Reconnect the negative battery terminal, start the engine, and check if the charging fault light on the instrument panel goes out. Use a voltmeter to measure the generator's output voltage— the normal output voltage for a 24V system is usually 27-29V, and the voltage must be stable without significant fluctuations.
Let the engine idle for 5-10 minutes, listen for any abnormal noise from the generator, and check if the belt runs smoothly. Then conduct a short test drive and observe if electrical devices such as vehicle lights and air conditioning work normally. If there are no electrical fault alarms during driving, the installation is qualified.
The installation of Mercedes-Benz's 24V generator must closely align with the precision of its electrical system, heavy-load adaptability, and computer control logic. Core precautions cover safe operation, accessory compatibility, assembly details, computer matching, and inspection/acceptance to avoid component damage, system errors, or abnormal power generation. Specifics are as follows:
Strictly follow the process of "disconnect the negative battery terminal first, then reconnect it". Turn off all on-board electrical devices (including hidden ones) before disconnection. Wear insulated gloves and goggles during operation. High-temperature components in the engine compartment (such as the exhaust pipe and turbocharger) must cool to room temperature to prevent scalds or electric shocks.
For prolonged power disconnection (more than 30 minutes), be sure to connect a Mercedes-Benz-specific on-board memory retainer to avoid data loss from systems such as the ECU (Engine Control Unit), vehicle stability system, seat memory, and navigation settings. Otherwise, fault codes or functional failures may occur after restart, and some luxury models require reprogramming to recover.
It is prohibited to verify power generation status through methods such as "spark testing" or "terminal short-circuiting". Mercedes-Benz generators integrate precision rectifier modules and sensors; such operations will directly burn internal components and may trigger the vehicle's high-voltage protection mechanism.
Must use original Mercedes-Benz or authorized certified 24V generators, which need to accurately match the vehicle's year, model, and engine code (different series of engines have different compatible generator parameters). Never replace with universal or other brand generators, as this will lead to incompatible charging logic and system errors.
Fully inspect the new generator before installation: Ensure the pulley rotates smoothly without jamming, bearings produce no abnormal noise, wiring terminals are free of oxidation and rust, and the sensor plug fully matches the original vehicle's interface. Verify that parameters such as the generator's rated power and output current are consistent with the original vehicle to avoid BMS alarms caused by mismatched parameters.
Wires and auxiliary materials must comply with Mercedes-Benz standards: The output cable should use high-temperature resistant and flame-retardant wires consistent with the original vehicle's specifications (cross-section ≥25mm², suitable for 24V high-current scenarios), and joints should be silver-plated and firmly crimped. If wire harness replacement is needed, use Mercedes-Benz-specific wire harnesses; do not splice or extend wires independently.
References：
There is no single fixed source for the precautions related to the installation of Mercedes-Benz's 24V generator you previously inquired about. The content is compiled by integrating various types of public information, such as professional service manuals for Mercedes-Benz models and practical experience from automotive repair platforms. The specific information sources are as follows:
mercedesman.ru: This website details the disassembly and installation processes of generators for specific Mercedes-Benz model series, including gasoline engines (Series 111, 112) and diesel engines. It covers details such as bolt tightening torque (e.g., 42N・m for generator fixing bolts) and wiring terminal connections, serving as an important technical reference for Mercedes-Benz generator installation operations.
automanuals.biz: Publishes generator disassembly and assembly specifications for Mercedes-Benz Sprinter models. It clarifies the tightening torque standards for nuts of different terminals and mentions subsequent operations such as radio decoding and clock setting after installation, supplementing key points for the post-installation finishing process.
Qiche Dashi (Car Master): Multiple repair practitioners on the platform share practical experience in Mercedes-Benz generator installation and matching, covering precautions such as accessory selection, tool preparation, computer matching steps, and common fault troubleshooting. For example, it emphasizes the need to match the vehicle and engine model, and perform system initialization with a professional OBD scanner, which is closely aligned with daily repair scenarios.
Some Mercedes-Benz owners and repair enthusiasts share their personal experiences of replacing generators on forums. Examples include belt removal techniques when replacing the generator for the CLK320 model, difficulties in fixing the generator during installation, as well as practical precautions such as preventing wire short circuits and component collisions during installation. These provide real-case support for the installation precautions.
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