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Type :
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Altemator
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Specification :
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12V 100A
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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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270600A070 270600-A070
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Quality :
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Remanufacture
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Delivery time :
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10 day
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The replacement shall be performed in the sequence of Power-off → Remove Old Generator → Clean → Install New Generator → Wiring → Install Drive Belt → Tighten Fasteners → Test. Strictly follow the torque specifications and wiring routes specified in the vehicle-specific manual to prevent short circuits, belt misalignment, and abnormal noise.
Turn off the engine, engage the parking brake, and place wheel chocks. Disconnect the negative battery terminal and wait for at least 2 minutes to achieve a complete power-off. Perform all operations on a cold engine to prevent scalding and short circuits.
Tools: Socket/ratchet wrenches (common sizes: 10mm, 14mm, etc.), extension bars, torque wrench, multimeter, belt tension gauge.
Parts & Consumables: OE-matched generator assembly, lock washers/nuts, insulating tape, anti-rust lubricant.
Documentation: Take photos or mark the positions of wire harness connectors and mounting bolts to avoid incorrect connection during reassembly.
Remove the old generator (reverse procedure of installation):Loosen the belt tensioner to remove the drive belt → Unplug the electrical connector / Remove the B+ terminal nut and insulate the terminal → Remove the mounting bolts → Take out the old generator → Clean the mounting surface and bracket; inspect the tensioner, idler pulleys, and drive belt for aging, cracks, or damage.
Pre-install the new generator:Position the new generator and insert the mounting bolts for preliminary alignment (do not fully tighten) → Connect the B+ terminal and tighten it to the torque specified in the manual; cover the terminal with heat-shrink tubing or insulate it properly → Plug in the electrical connector until it locks in place → Install the drive belt according to the routing diagram, release the tensioner to reset it, and check the belt alignment and tension.
Final Tightening and Completion:Tighten the generator mounting bolts to the torque specified in the manual → Recheck all wire harnesses and connectors → Reconnect the negative battery terminal → Power on the vehicle for self-inspection; measure the B+ terminal voltage at idle speed (standard range: 13.8–14.5V). Ensure there is no unusual odor, abnormal noise, or warning lights → Conduct a road test and re-measure the voltage to confirm normal operation.
Limited Working Space: It is often necessary to remove the right front wheel/fender liner or loosen the air conditioning pipes to create sufficient access. The lower mounting bolts are difficult to reach; use an extension bar with a torque wrench and tighten to the specified torque (common specification: approx. 52 N·m).
Wire Harness Handling: Press the connector lock tab before unplugging to avoid pulling the harness forcefully. Always disconnect the battery before removing or installing the B+ terminal, and ensure proper insulation to prevent grounding.
Drive Belt Requirements: Install the belt strictly following the routing diagram and maintain proper tension. Excessive tension will damage the bearings, while insufficient tension will cause slipping. Replace the belt if signs of aging are present.
Seized Bolts: Apply penetrating oil and loosen the bolts gradually in a crisscross pattern. Do not use extended bars for forced loosening to prevent thread stripping or bolt breakage.
Loose Electrical Connectors: Clean the pins and lock tabs, confirm the correct installation orientation, and ensure a firm "click" is heard before releasing the connector.
Abnormal Power Generation: Inspect the B+ terminal tightness, connector contact, and drive belt slipping. Normal voltage at idle is 13.8–14.5V; voltages below 13.5V or above 14.7V indicate a need to inspect the regulator, rectifier bridge, or drive belt.
Abnormal Noise: Check for drive belt misalignment, worn bearings in the tensioner/idler pulleys, or generator internal bearing failure. Replace faulty components as required.
Disconnect the negative battery terminal first and wait for at least 2 minutes to ensure the vehicle's electronic control system is completely powered off. This prevents short circuits that could burn out fuses, the ECU, or the generator rectifier bridge during disassembly and assembly.
Additional precautions for hybrid models: Follow the procedure specified in the original factory manual to disconnect the high-voltage battery service switch. Perform high-voltage system discharge before any operation. Never touch high-voltage wiring harnesses or components without power-off.
Avoid allowing tools to contact both the generator B+ terminal and the vehicle's metal body simultaneously throughout the operation to prevent ground short circuits.
Tighten the mounting bolts in accordance with the original factory torque specifications (torque varies by model; e.g., approximately 52 N·m for ES series). Never over-tighten, as this may cause thread stripping or bracket deformation. Use a crisscross, gradual tightening/loosening sequence during both disassembly and assembly to prevent the generator housing from cracking due to uneven stress.
Use matching lock washers with the bolts. Clean rust and oil stains from the bolt holes and bracket contact surfaces before installation; apply a small amount of anti-seize lubricant if necessary.
Install the drive belt strictly following the routing diagram located in the engine compartment. Reversing the routing direction will cause generator reverse rotation, abnormal power generation, or belt slipping.
Check the belt tension with a tension gauge, or use the empirical method: Press the middle of the belt; a deflection of approximately 10–15 mm indicates proper tension. Excessive tension will wear the generator bearings, while insufficient tension leads to slipping, abnormal noise, and insufficient power output.
Replace the belt immediately if cracks, aging, or tooth loss are observed. Replace the tensioner and idler pulleys together if they produce abnormal noise or exhibit looseness when rotated.
Ensure the generator fits tightly against the bracket without offset or tilting during installation. Misalignment will result in belt deviation and abnormal bearing stress.
For some models (e.g., RX series) with limited working space, it may be necessary to remove the right front wheel and fender liner, or temporarily loosen the air conditioning pipes to create access. Never forcefully pry or pull the generator housing.
Clean oxide layers from the terminal before wiring to ensure the nut is tight without loosening after installation. Cover the terminal with an insulating sleeve or wrap it with insulating tape to prevent contact with the vehicle's metal body.
Never plug or unplug the B+ terminal wiring without power-off. Do not pull the wiring harness excessively tight, as this may cause terminal solder joint failure or harness breakage.
Press the connector lock tab to unlock before plugging or unplugging the wiring harness connector. Never pull the harness forcefully to avoid bending or breaking pins, or causing poor contact inside the connector.
Confirm the connector is fully locked (a distinct "click" sound should be heard) after insertion. Check the wiring harness routing post-installation to prevent abrasion by the drive belt or rotating components.
References：
The two documents you received previously—Installation Method for Lexus 12V Generator and Precautions for Installation of Lexus 12V Generator—are original operation guidelines compiled by me based on general automotive maintenance specifications, common disassembly and assembly key points for Lexus models (e.g., limited working space for ES200, requirement of high-voltage power-off for hybrid vehicles), and industry-standard voltage ranges (13.8–14.5V). They are not directly excerpted from any single publicly published manual or webpage.
General Processes and Safety SpecificationsThe operation sequence of
Power-off → Remove Old Generator → Clean → Install New Generator → Wiring → Install Drive Belt → Tighten Fasteners → Test is the industry-standard procedure for generator assembly replacement. Basic safety and technical requirements for electrical and mechanical maintenance include disconnecting the negative battery terminal first, insulating the B+ terminal, and tightening components according to specified torque values.
Lexus Model-Specific Key PointsRequirements such as the need to remove the right front wheel/fender liner due to limited working space for models like the ES200, proper tightening and insulation of the B+ terminal, and control of drive belt routing and tension are derived from practical experience shared on Lexus owner forums and maintenance communities, as well as common specifications in original factory Repair Manuals (RM) (e.g., bolt torque values, wiring harness routing directions).
Voltage and Testing StandardsThe idle voltage range of 13.8–14.5V is a typical normal range for 12V automotive charging systems, applicable to the vast majority of passenger vehicles, including Lexus models.
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