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Type :
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Alternator
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Specification :
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12V 150A
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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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23100-7239R
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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 150A generator for Renault and Mercedes-Benz vehicles generally follows the universal disassembly and assembly logic of automotive generators, while requiring adaptation to the exclusive requirements of each brand’s engine compartment structure, bolt torque, etc. Below is a detailed installation method summarized based on the characteristics of both vehicle brands:
Park the vehicle on a flat surface and turn off the engine. Wait for the engine to cool down to room temperature. Disconnect the negative battery cable. If the radio or navigation system of Mercedes-Benz or Renault vehicles is equipped with an anti-theft code, record it in advance to avoid device lockout after power disconnection. For some Mercedes-Benz models, it is recommended to connect an on-board system memory saver to prevent loss of electronic control parameters. Wear insulating gloves to avoid short circuits caused by direct contact with terminals.
Prepare tools including sockets (including Torx sockets such as Mercedes-Benz commonly used T60 and E12 specifications), torque wrench, voltmeter, OBD scanner, etc. Inspect the new 12V 150A generator: For Renault-compatible generators (e.g., Hella brand), confirm that the pulley (e.g., 7-groove pulley for some Renault models) rotates smoothly. For Mercedes-Benz original equipment generators (e.g., Valeo brand), check that the carbon brushes and voltage regulator are undamaged, with no looseness or external defects.
Place the new generator on the mounting bracket in the engine compartment. Fine-tune its position to align the generator’s fixing bolt holes with the bracket holes accurately. For some Renault models (e.g., Kadjar, Megane), clean the pipelines around the installation position first to avoid interference. For some Mercedes-Benz models, it may be necessary to remove the engine underbody shield or cooler hoses before placing the generator and initially tightening the fixing bolts (do not fully tighten to reserve space for belt tension adjustment).
Locate the core pins (e.g., B+, D+) of the generator. Connect the B+ terminal to the battery positive line, the D+ terminal to the voltage regulator positive, and the ground wire to the corresponding vehicle ground point. For Mercedes-Benz models, ensure the wiring harness connectors are clean to avoid poor contact due to oxidation. For Renault models, confirm that the plug buckle is securely engaged to prevent detachment during driving. If the wiring harness is disassembled, mark the connections in advance to avoid incorrect wiring.
Follow the belt routing marked in the engine compartment to fit the belt around the generator pulley and idler pulley. For Mercedes-Benz models, use a tool to press the tensioner to loosen the belt before installation. For Renault generators with movable pulleys, ensure compatibility with the 7-groove belt. After installation, adjust the tensioner: pressing the middle of the belt should result in a sag of 1–2 cm. Avoid excessive tension (which wears bearings) or insufficient tension (which causes slipping and reduces power generation efficiency).
Use a torque wrench to tighten the fixing bolts according to vehicle standards:
Mercedes-Benz: Generator fixing bolts are recommended to be tightened to 42Nm; B+ terminal nut to approximately 18Nm; small terminal nuts to approximately 5Nm.
Renault: Refer to the standards for similar models, with bolt torque generally controlled between 35–45Nm.
Ensure all bolts are securely tightened to prevent resonance noise during operation. If surrounding components (e.g., power steering pump) were moved during disassembly, reset and tighten them simultaneously.
Mercedes-Benz: Connect an OBD scanner to the vehicle control system. Locate the "Generator Settings" or "Electrical System Initialization" option, enter parameters such as the new generator’s 150A output current, and calibrate the BMS module to ensure the system recognizes the battery and charging status.
Renault: Most models do not require additional matching, but for some new models with intelligent electronic control systems, it is recommended to use a scanner to clear potential fault codes.
Reconnect the negative battery cable. After starting the vehicle, use a voltmeter to check the output voltage (normal range: 13.5–14.5V; e.g., Mercedes-Benz models typically stabilize at around 13.8V). Confirm that:
No charging fault light is illuminated on the instrument panel.
The generator operates without abnormal noise.
The belt shows no deviation or slipping.
Electrical equipment is supplied with power normally.
The installation is complete once all conditions are met.
Combining the structural differences between Renault and Mercedes-Benz models, the power characteristics of the 12V 150A generator, and the electrical system features of both brands, the installation of this generator model requires focused attention to safety protection, component compatibility, installation precision, and other key aspects. Specific precautions are as follows:
For Renault vehicles: Recommend using compatible brands (e.g., Hella) or original factory generators. For Mercedes-Benz vehicles: Prioritize original equipment components (e.g., Valeo). Ensure the generator is specified as 12V 150A, with matching pulley groove count and mounting hole positions (e.g., 7-groove pulleys for some Renault models).
Never mix generators of different power ratings, as this may cause charging system incompatibility and burn out electrical components.
The cross-sectional area of the cable connecting the generator’s B+ output terminal must be greater than 35mm² to match the 150A output power, preventing cable overheating due to overload.
In addition to general-purpose sockets and torque wrenches, prepare Mercedes-Benz-specific tools: Torx sockets (T60, E12 specifications) and a dedicated OBD scanner.
Prohibit the use of non-compliant tools (e.g., adjustable wrenches) to avoid bolt stripping or damage to the generator housing.
Before installation, must disconnect the negative battery cable. For some Mercedes-Benz models with complex electronic control systems, it is recommended to connect an external on-board system memory saver to prevent loss of electronic control parameters. For Renault vehicles with anti-theft code-protected electronic devices, record the code in advance.
When reconnecting wires, follow the sequence: positive terminal first, then negative terminal to avoid reverse polarity damage to the voltage regulator.
Clean the surface of the generator mounting bracket, electrical connectors, and vehicle ground points before installation to remove oil, grease, and oxide layers.
For Mercedes-Benz models: Pay special attention to cleaning wiring harness connectors. For Renault models: Ensure plugs are free of impurities. Poor contact can cause sparking or power generation failures.
References：
The previously provided core precautions for installing the 12V 150A generator for Renault and Mercedes-Benz vehicles are not derived from a single official document. Instead, they are a comprehensive summary integrated with universal automotive industry specifications, brand-specific maintenance experience for both vehicle models, and third-party technical data. The specific source basis for each part of the content is as follows:
The basic common requirements for generator installation mentioned in the content are highly consistent with the universal technical specifications in the field of automotive generators. For example:
Requirements such as "the cross-sectional area of the cable connecting the generator’s B+ output terminal must be greater than 35mm²", "the distance between the generator installation position and other vehicle components must be no less than 10mm", and "re-calibrate the belt tension after the new vehicle travels approximately 1,000 km" align with the core requirements for high-power generator cable adaptation, installation spacing, and belt maintenance outlined in the Generator Technical Service Guide compiled on Docin.com.
Operational specifications such as disconnecting the negative battery cable before installation and avoiding reverse polarity during wiring also comply with the universal safety guidelines for automotive generator installation in the Pacific Auto Encyclopedia.
The exclusive installation details related to Mercedes-Benz vehicles correspond to relevant Mercedes-Benz maintenance manuals and third-party practical tutorials. For example:
The torque parameters such as "generator fixing bolts should be tightened to 42Nm, B+ terminal nuts to approximately 18Nm, and small terminal nuts to approximately 5Nm" are fully consistent with the bolt torque specifications recorded in the generator disassembly and assembly documentation for Mercedes-Benz Sprinter models published on AutoManuals.biz.
Content such as "using an OBD scanner to enter generator parameters and calibrate the BMS module" and "using a memory saver to protect on-board system parameters during power disconnection" also matches the key steps in practical tutorials for Mercedes-Benz generator matching on Qiche Dashi (Auto Master).
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