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Type :
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ACgenerator Alternator
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Specification :
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12V 250A
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Pulley :
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12V 250A
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Brand :
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NUOJIN
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Number :
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A0009066906
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Quality :
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Remanufacture
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Delivery time :
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30DAYS
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The installation of the 12V generator for Mercedes-Benz vehicles follows a general process, with the core lying in post-installation system matching—a special requirement for Mercedes-Benz's electrical system. Below are detailed installation steps, applicable to most mainstream Mercedes-Benz models:
First, confirm the vehicle's specific model and engine type based on the vehicle registration certificate. Select original Mercedes-Benz 12V generators or those from authorized brands to ensure compatibility. Prepare tools including wrenches, torque wrenches, screwdrivers, OBD scanners, and voltmeters. It is also recommended to have insulated gloves to ensure operational safety.
Park the vehicle on a flat surface and engage the handbrake. After turning off the engine, wait for high-temperature components such as the exhaust pipe in the engine compartment to cool down. Disconnect the negative battery terminal. If the power needs to be disconnected for an extended period, connect an on-board memory saver to prevent data loss from systems such as the engine control unit (ECU) and seat memory. Additionally, clean dust and oil around the generator's installation location to avoid affecting installation and contact performance.
First, observe and record the routing of the generator's drive belt to avoid incorrect installation later. Use a wrench to loosen the belt tensioner and remove the drive belt.
Next, disconnect the electrical connector and cable connections of the old generator, then unscrew the bolts fixing the generator. For some Mercedes-Benz models where the generator is surrounded by obstructive components, remove the relevant parts in accordance with specifications and mark their positions clearly. Finally, smoothly take out the old generator.
Place the new generator accurately in the original installation position, align the bolt holes, and initially hand-tighten the fixing bolts for positioning. Then use a torque wrench to tighten the bolts to Mercedes-Benz's specified torque (to avoid vibration from loose bolts or damage to the generator housing from over-tightening).
If components such as the air conditioning compressor or protective covers were removed earlier, reset and fix them one by one according to the marks. Subsequently, connect the generator's electrical connector and cables, ensuring the joints are firmly connected with no wire insulation damage or aging. Repair any damaged wires before connection if necessary.
Fit the drive belt according to the previously recorded routing. Adjust the tensioner to achieve moderate belt tension, ensuring the belt is aligned with all pulley grooves to prevent slipping or excessive bearing wear during operation.
This is a crucial step for Mercedes-Benz models. Connect the OBD scanner to the vehicle, access the vehicle control system, find the "Generator Settings" or "Electrical System Initialization" option, and enter parameters such as the new generator's output current to complete matching. Then access the Battery Management System (BMS) module for calibration, ensuring the system can correctly identify the battery status and charging logic.
Reconnect the negative battery terminal, start the engine, and use a voltmeter to measure the generator's output voltage (normal range: 13.5–14.5V). Meanwhile, check the instrument panel to confirm no abnormal illumination of warning lights such as the charging fault light.
After starting, let the engine idle for 5–10 minutes, checking for no abnormal noise from the belt and no vibration from the generator. Then conduct a short test drive, observing for any electrical system fault alarms during driving. If all indicators are normal, the installation is complete.
The installation of Mercedes-Benz's 12V generator must closely align with the high precision of its luxury vehicle electrical system, exclusive system matching requirements, and model layout characteristics. Core precautions cover safety protection, accessory compatibility, assembly details, and system calibration to avoid damaging the vehicle's core electrical components or affecting power generation stability:
Strictly adhere to the principle of "disconnect the negative battery terminal first, then reconnect it" throughout the process. Turn off all electrical equipment before disconnection. Wear insulated gloves during operation, and never allow metal tools to touch both the generator terminals and the vehicle's metal body simultaneously to prevent electric sparks from short circuits.
High-temperature components in the engine compartment (exhaust pipe, turbocharger) must cool to room temperature before operation to avoid scalding. When connecting wires, keep them away from heat sources (exhaust manifold, oil pipes) to prevent overheating and aging of the wire insulation.
An on-board memory saver must be connected for prolonged power disconnection to prevent data loss from systems such as the ECU (Electronic Control Unit), seat memory, and navigation settings, which could lead to fault codes or functional abnormalities after restart.
Strictly match the vehicle model and generator specifications: Prioritize original Mercedes-Benz or authorized certified brands, ensuring compatibility with the specific vehicle year (e.g., different model years of C-Class, E-Class, S-Class) and engine model (M274, M276, etc.). Never replace with universal generators to avoid charging failures due to parameter incompatibility.
Fully inspect the new generator before installation: Ensure the pulley rotates smoothly without jamming, the bearings produce no abnormal noise, the terminals are free of oxidation and rust, and the electrical connector fully matches the original vehicle's interface. Avoid forced insertion or removal to prevent interface damage.
Wires and auxiliary materials must be compatible: Use wires that match the original vehicle's specifications for connections, and ensure joints are firmly crimped. If wire harness replacement is needed, use Mercedes-Benz dedicated flame-retardant wire harnesses to prevent heat ablation caused by high current.
Tighten the fixing bolts to Mercedes-Benz's specified torque (reference value: the torque for generator fixing bolts of most models is 25-35N·m, subject to the vehicle's service manual). Avoid vibration and abnormal noise from loose bolts, or damage to the generator housing and threaded holes from over-tightening.
Precise drive belt installation: The routing must be consistent with the original factory. Control the tension to "1-2cm sag when pressing the middle of the belt", ensuring the belt fully fits all pulley grooves without deviation or distortion to prevent slipping or bearing overload during operation.
Standardized wire connection: Distinguish the functions of electrical connectors, ensure connectors are fully secured and buckles are reset, and cables are firmly fixed without loosening to avoid friction and insulation damage during driving. Clean the negative grounding point thoroughly to remove paint and rust, ensuring good grounding.
References：The installation method and related precautions for the 12V generator of Mercedes-Benz vehicles you previously inquired about are not derived from a single exclusive official technical document of Mercedes-Benz. Instead, they are integrated from multiple types of source information, including model-specific maintenance references for Mercedes-Benz, practical experience summaries from automotive repair platforms, and general installation specifications. The specific sources are as follows:
Content from dedicated Mercedes-Benz maintenance websites: For example, the documents on generator removal, inspection, and installation for models such as the Mercedes-Benz C-Class (W203) published on mercedesman.ru. These documents detail the removal steps, installation torque, and other specifics of generators for gasoline engine series 111 and 112, as well as diesel engine models.
Additionally, the generator disassembly and assembly instructions for Mercedes-Benz Sprinter models on automanuals.biz specify detailed torque standards such as 42N·m for fixing bolts. These serve as important model-specific reference bases for the installation of 12V generators in different Mercedes-Benz models.
Multiple generator-related content pieces targeting different Mercedes-Benz models published on the Qiche Dashi (Automotive Master) platform. Examples include practical experience sharing on generator matching, pre-installation preparations, and precautions for models like the Mercedes-Benz C180, GL450, G63, and E300.
Derived from frontline repair practices, these contents supplement detailed key points such as model verification, circuit inspection, and system matching during installation for different models, acting as important references for model adaptation-related precautions in actual installation operations.
Documents such as "Introduction to Knowledge Related to the Structure and Principle of Automotive Generators" published on automotive maintenance websites. These cover general specification requirements for generator installation, including universal torque standards and belt inspection.
Though not limited to Mercedes-Benz models, these general specifications provide universal technical references for basic operations in the installation of Mercedes-Benz 12V generators, such as bolt tightening force and belt condition inspection.
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