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Type :
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AIternator
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Specification :
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24v 80A 110A
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Pulley :
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9pk
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Brand :
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nuojin
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Number :
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0124555001 0124555002
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Quality :
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Remanufacture
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Delivery time :
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10DAY
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Mercedes-Benz 24V generators are mostly used in its commercial vehicles or some high-power models. Installation requires mechanical fixation, wiring connection and system matching, with slight differences in details among different series of models. Below are the general and standardized installation steps; it is recommended to refer to the corresponding vehicle's maintenance manual during operation:
First, confirm that the new generator is a Mercedes-Benz compatible model, and prioritize original factory or authorized brand accessories. Prepare tools including socket wrenches, torque wrenches, belt tensioner tools, OBD scanners, voltmeters, as well as gloves and goggles to prevent scratches.
Turn off the vehicle and let it cool down for more than half an hour, then disconnect the negative terminal of the storage battery. If the power is cut off for a long time, use a memory saver to protect the vehicle's on-board system settings to avoid parameter loss. In addition, you can take photos of the belt route and wiring connection positions around the generator in advance to facilitate subsequent reinstallation.
If the old generator has just been removed, use cleaning tools to remove dust, oil and debris from the installation position. At the same time, check if the bracket is deformed or cracked, and properly retain and reset small parts such as gaskets.
Place the new 24V generator steadily on the installation bracket, align with the positioning pins and bolt holes, and initially fix it with hand-tightened fixing bolts without fully tightening to reserve space for subsequent adjustments.
Use a torque wrench to tighten the fixing bolts according to Mercedes-Benz's specified torque. The torque varies by model; for example, some models require 42N・m. Avoid loose or over-tightened bolts that may cause vibration damage.
Distinguish the interface functions when connecting wires. Common interfaces of Mercedes-Benz 24V generators include B+, D+, etc. The B+ interface is connected to the positive power cable of the storage battery and fixed by tightening the nut with a wrench. The D+ interface is connected to the positive terminal of the regulator, and the E interface is connected to the engine body ground wire. Ensure each connector is free of oxidation and firmly connected without loosening. Finally, press the wire harness connector buckle and insert the connector back into place until it clicks.
Refer to the previously photographed belt route and fit the belt into the generator pulley and other corresponding pulley grooves.
Use a belt tensioner tool to press against the automatic tensioner and rotate it counterclockwise to release tension, adjusting to the appropriate state to ensure the belt fits the pulley grooves. Test the belt tension: pressing the midpoint of the belt firmly with the thumb, a deflection of 5-6mm is appropriate. Too loose a belt is prone to slipping, while too tight a belt will accelerate bearing wear.
Connect the OBD scanner to the vehicle, enter the vehicle control system, find the "Generator Settings" or "Electrical System Initialization" option, and input parameters such as the output current of the new generator to complete the matching. Then enter the BMS module calibration to ensure the system correctly identifies the battery and charging status.
Reconnect the negative terminal of the storage battery and start the vehicle. Use a voltmeter to measure the voltage; the voltage at idle speed should be around 13.5-14.5V. Turn on high-power electrical equipment such as headlights and air conditioning, and observe if the voltage fluctuation is less than 0.5V. At the same time, check that no fault lights are on the instrument panel, listen for no abnormal noise during generator operation, and confirm normal operation through a dynamic driving test.
The core precautions for installing a Mercedes-Benz 24V generator revolve around "safety protection, component matching, standardized operation, and test verification" to avoid electrical failures or mechanical damage:
Ensure the vehicle is 熄火 and cooled down throughout the process, and disconnect the negative terminal of the battery before starting work to prevent short circuits and electric shocks.
Wear gloves and goggles to avoid injuries from slipping tools or scratches from belts and parts.
It is prohibited to plug or unplug the generator's wiring connectors when the power is on, and do not touch high-voltage interfaces such as B+ with metal tools.
The new generator must be a model compatible with the corresponding Mercedes-Benz vehicle. Check that the voltage (24V), power, and mounting holes are consistent with the original factory specifications; non-standard components are not allowed.
Before installation, check that the generator bearings run smoothly and the terminal posts are free of oxidation. Bracket gaskets and fixing bolts must use original vehicle components; replace any missing or damaged parts promptly.
When cleaning the installation position, avoid residual oil from entering the generator interior, and do not strike the generator housing to prevent damage to internal coils.
Connect the wires strictly according to the interface markings: B+ to the positive terminal of the battery, D+ to the regulator, and E to the ground. Incorrect or reversed connections may burn out the generator or on-board electrical appliances.
Ensure the connectors are tightened during wiring. The ground wire must be connected to a clean metal surface of the engine body or vehicle body; remove surface paint or oxide layers to ensure good contact.
Arrange the wires neatly, keep them away from rotating parts such as belts and fans, and secure them with cable ties to avoid friction-induced wear and short circuits.
The belt must be installed according to the original vehicle's routing; misalignment or dislodgment from the grooves is not allowed. The tension must be strictly controlled: a too-loose belt is prone to slipping and insufficient power generation, while a too-tight belt will cause premature damage to the generator bearings.
Fixing bolts must be tightened with a torque wrench according to the vehicle's specified torque (usually 35-45N・m, subject to the maintenance manual). Do not rely on hand feel to apply force, to prevent bolt stripping or bracket deformation.
After installation, an OBD scanner must be used to complete the matching between the generator and the vehicle system. Failure to match may result in abnormal power generation and instrument panel alarms.
After starting the vehicle, use a voltmeter to check the voltage. The voltage must be within the specified range (13.5-14.5V) at idle and under load. It is considered qualified only if no fault lights are on and there are no abnormal noises.
If there are issues such as unstable power generation, peculiar smells, or smoke after installation, immediately turn off the engine and disconnect the power, check for wiring or belt problems, and do not continue driving.
References：
The installation methods and related precautions for the Mercedes-Benz 24V generator you previously reviewed are not derived from a single official document or specific authoritative source. Instead, they are compiled and summarized based on general specifications in the automotive maintenance field, the electrical system characteristics of Mercedes-Benz models, and technical data from multiple automotive maintenance platforms. The relevant information sources are as follows:
The wiring connection rules, such as connecting B+ to the positive terminal of the storage battery, D+ to the positive terminal of the regulator, and E to the ground wire, are consistent with the general wiring standards for 24V generators published on Autohome. This is the universal electrical connection logic for this type of generator.
Steps including disconnecting the negative terminal of the storage battery before installation, cleaning the installation position, and installing and adjusting the belt tension refer to the general installation process of automotive generators released by PCauto. They are also supplemented and refined in combination with the basic mechanical operation requirements of Mercedes-Benz models.
Content emphasizing the adaptation of original factory components, system matching with OBD scanners, and BMS module calibration is derived from the technical key points related to Mercedes-Benz generator replacement and matching published by Qiche Dashi (Auto Master). It aligns with the special requirements of Mercedes-Benz models' electrical systems for component and parameter matching.
Precautions such as tightening fixing bolts to the specified torque, keeping wires away from rotating parts, and avoiding the engine exhaust port refer to the general requirements for installation spacing and protection specifications in the generator technical service guide published on Docin.
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