Alternator TG17C032 RAA11315， CA2055IR，ALV2055LK,ALV2055UX ALV2055BA,ALV2055DD,ALV2055KL，9090588F ，6421540302.6421540502.A6421540302，930204 FOR Mercedes Benz

The installation steps for the Mercedes-Benz 12V generator are as follows: Preparation work •  Confirm the vehicle model and engine model, and prepare a suitable Mercedes-Benz 12V generator.  •  Prepare tools such as wrenches, screwdrivers, pliers, torque wrenches, and voltmeters.  •  Clean the generator installation position and the surrounding area in the engine compartment to ensure there is no dust, oil, etc.Removing the old generator •  Disconnect the negative cable of the vehicle's battery to prevent short circuits during the installation process.  •  Check the belt routing diagram in the engine compartment and remember the belt's routing. Use a socket wrench to turn the tensioner clockwise to release the tension on the generator belt, then remove the belt from the generator pulley and other related pulleys.  •  Unplug the electrical connection plugs on the back of the generator, which usually include the power cord, excitation wire, etc. Pay attention to marking the positions and connection directions of the plugs to avoid incorrect connection during installation.  •  Use a wrench or socket to unscrew the generator's fixing bolts, usually there are two (upper and lower), then take out the old generator from the engine compartment.Install the new generator •  Place the new generator in the original installation position, ensure the mounting holes are aligned, then insert the fixing bolts and tighten them gently by hand.  •  According to the previously marked positions, correctly plug the electrical connection plugs back into the generator's terminals to ensure a secure connection.  •  Following the belt routing diagram, fit the belt onto the generator pulley and other relevant pulleys. Use the belt tensioner to adjust the belt tension so that the middle of the belt can sink 10-15mm when pressed with a finger. Lock the tensioner after adjustment.  •  Use a torque wrench to tighten the generator's fixing bolts to the specified torque. Torque requirements may vary for different vehicle models; for example, for the gasoline engine of the Mercedes-Benz W203 model, the generator fixing bolt torque is 42N・m, and for the diesel engine, it is 20N・m.Inspection and Testing •  Reconnect the negative battery cable.  •  Start the engine and observe whether the generator runs smoothly and if there are any abnormal noises.  •  Use a voltmeter to measure the voltage across the battery. When the engine is running, the voltage should be between 13.5-14.5V, indicating that the generator is working properly.

Installation Precautions for Mercedes-Benz 12V Generator •  Safety Protection First: During the entire installation process, the negative pole of the battery must be disconnected. If the vehicle is equipped with a start-stop system or complex electronic modules, it is recommended to use a diagnostic instrument to activate the "electrical system maintenance mode" to avoid loss of on-board computer data due to power failure; wear insulating gloves and goggles during operation, and keep away from high-temperature engine components (such as turbochargers, exhaust pipes) to prevent scalding or electrical short circuits.  •  Accessory Matching Requirements: It is necessary to select original or OE-certified generators that are fully compatible with the specific Mercedes-Benz models (such as W205, W213, etc.) and engine models. Check that the generator's power parameters, mounting holes, and wiring interfaces are consistent with the original vehicle to avoid installation failure or damage to the electrical system due to mismatched accessories.Implementation of Torque Standards: When tightening the generator fixing bolts and belt tensioner bolts, it is necessary to strictly follow the torque requirements specified in the maintenance manual for the corresponding vehicle model (for example, the torque for the generator fixing bolts of the Mercedes-Benz W212 model is usually 35-45N・m, and the specific value shall be subject to the vehicle model). Use a precise torque wrench, and it is forbidden to tighten by hand feel to prevent bolt loosening or thread damage. Belt Installation Specifications: Before installing the drive belt, clean the oil stains and debris on the surface of the pulley to ensure that the belt fits tightly with the pulley; the tension must be controlled within the range specified by the manufacturer, generally, it is appropriate that the middle position of the belt sinks by 8-12mm when pressed (some Mercedes-Benz models are equipped with special tension detection tools). If it is too loose, it is easy to slip and affect the power generation efficiency; if it is too tight, it will accelerate the wear of the generator bearing and the belt.Key Points for Circuit Connection: Before wiring, check the generator terminal markings (such as B+, D+, W, etc.) to ensure they correspond one-to-one with the vehicle's circuits, avoiding reversed positive and negative connections; when connecting plugs, ensure the clips are fully engaged, and expose the terminal blocks need to be wrapped with insulating tape to prevent contact with metal parts in the engine compartment, which could cause a short circuit and damage the generator rectifier or on-board ECU.  •  System Calibration and Testing: After installation, use a Mercedes-Benz dedicated diagnostic tool (such as Star Diagnostic) to perform initial calibration on the charging system, clear old fault codes, and check the system communication status; after starting the engine, in addition to measuring the output voltage (normally 13.5-14.5V), observe that the instrument panel has no charging fault light on, the generator operates without abnormal noise, and the voltage is stable at idle and acceleration, ensuring the system works normally.Subsequent Maintenance Reminder: In the short term after installation, it is necessary to regularly check whether the generator's fixing bolts are loose, whether the belt has cracks or wear, and whether there is a heating phenomenon at the wiring connections; if problems such as voltage fluctuations or abnormal noises occur, the machine must be shut down immediately for inspection to prevent the failure from expanding and affecting the normal operation of the vehicle.

References：Sources of Information •  "Mercedes-Benz Vehicle Repair Technical Manual (General Edition)" — An official Mercedes-Benz publication outlining standard repair documents for vehicle models, including specific technical requirements and safety regulations for the installation of generators across various model series.  •  Automotive Industry Standard "GB/T 27840-2011 Technical Conditions for Automotive Generators" — A national recommended standard specifying requirements for the installation, inspection, and safety performance of automotive generators.  •  BOSCH Automotive Aftermarket Technical Document "Mercedes-Benz Special 12V Generator Installation and Maintenance Guide" — Professional technical materials compiled based on the characteristics of Mercedes-Benz vehicle electrical systems.