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Type :
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Alternator
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Specification :
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12V 100A
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Pulley :
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4PK
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Brand :
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NUOJIN
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Number :
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Quality :
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refurbish
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Delivery time :
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30 days
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The installation of 12V alternators for Great Wall Haval (taking mainstream models such as H6 as examples) and Mitsubishi (taking models such as Lancer and Outlander as examples) follows the core logic of power-off safety → positioning and fastening → circuit standardization → belt adjustment → test verification. Below are the general procedures, model-specific adaptation points, key torque values and safety specifications to ensure reliable and trouble-free installation.
Turn off the engine and remove the key. Disconnect the negative battery terminal to prevent short circuits and electric arcs. Engage the parking brake, cover the fenders with protective pads, and wait until the engine cools down to room temperature.
Prepare socket wrenches (10mm/13mm/15mm are commonly used), a torque wrench, a belt tensioner tool, insulated gloves, and a multimeter. Verify that the model and power rating (e.g., 120A/150A) of the new alternator match the vehicle requirements. Check that the pulley and connectors are identical to the old unit. Prepare new O-rings and insulating gaskets.
Remove oil stains, rust, and old sealant residue from the contact surface between the alternator bracket and the alternator housing to ensure no foreign objects cause jamming.
Align the new alternator with the mounting holes on the bracket. Adjust the angle to ensure the alternator pulley is coplanar with the crankshaft and compressor pulleys. Gently slide the alternator into place to avoid colliding with wire harnesses or the housing.
There are usually 2–3 mounting bolts (including the adjustment bracket bolt). First, hand-tighten all bolts symmetrically to secure the alternator.
Torque reference: Tighten the main mounting bolts to 22–25 N·m and the adjustment bracket bolts to 18–20 N·m (refer to the vehicle-specific manual for exact values).
Plug in the excitation connector (thin plug for control signals) and ensure the locking clip is fully engaged. Connect the main power cable (thick wire for 12V positive power) to the B+ terminal. Ensure washers and insulating sleeves are properly installed, then tighten the nut to 15–20 N·m. Confirm the terminal is free of oxidation and looseness.
Reattach the wire harness clips to prevent interference with belts and cooling fans.
Install the belt following the original routing diagram. Use a pry bar or belt tensioner tool to lever the alternator outward to tension the belt. A proper tension is achieved when pressing the middle of the belt results in a deflection of 2–5 mm. Lock the adjustment bolt in place.
Check the belt for misalignment and cracks; replace it with a new one if necessary.
Reinstall the removed components such as protective covers and mudguards, and fasten them securely.
Reconnect the negative battery terminal, start the engine, and confirm that the charging indicator light turns off. Use a multimeter to measure the idle voltage (normal range: 13.8–14.5 V). Verify that the voltage remains stable at 2000 rpm with no abnormal noise or odor.
Align the alternator with the mounting holes on the engine accessory bracket. Ensure the alternator fits tightly against the bracket with the pulley facing the belt side. Slide it into place slowly to avoid scratching the wire harnesses.
Most modern Mitsubishi models are equipped with automatic belt tensioners. Press the tensioner in the direction indicated by the arrow, slip the belt into place, then release the tensioner. For older models with manual adjustment, tension the belt and lock the adjustment bolt; the optimal belt deflection is 2–4 mm.
Reinstall the protective covers and pipelines. Top up the coolant and power steering fluid if necessary.
Start the engine and check for normal charging operation. Ensure there is no belt slippage noise and the alternator runs without abnormal vibration.
These precautions cover five core dimensions: safe operation, installation precision, circuit standardization, belt tensioning, and model-specific requirements. They are critical to avoiding post-installation issues such as charging failures, belt noise, and alternator burnout.
Disconnect the negative battery terminal before installation to prevent arc burns, short circuits, or damage to the vehicle’s electronic control system during wiring. Never reconnect the negative terminal until all electrical connections are fully completed.
Ensure the ignition switch is in the OFF position during wiring. Never hot-plug alternator connectors or main power terminals.
Avoid tools simultaneously contacting the alternator’s B+ terminal (positive) and the engine block (negative) during installation to prevent short circuits and terminal burn-out.
Clean the mounting surface: Thoroughly remove oil, rust, and old sealant from the contact surface between the alternator bracket and housing. Poor cleaning will lead to insufficient seating, resulting in vibration noise during operation and potential bearing wear.
Bolt tightening specifications
Main mounting bolts: Symmetrically hand-tighten first, then torque to specifications. For Great Wall Haval, the main bolts typically require 22–25 N·m; for Mitsubishi, 23–27 N·m (refer to the vehicle-specific manual for exact values). Over-tightening (risk of housing cracking or bracket deformation) and under-tightening (risk of loosening due to vibration) are strictly prohibited.
Wire harness mounting bolts: Torque to 7–10 N·m. Over-tightening may cut the wire insulation, while under-tightening may cause wire abrasion.
Component replacement requirements: Always replace old insulating gaskets and O-rings with new ones during installation. Aging old parts are prone to failure, leading to electric leakage or oil leakage (alternators on some models are adjacent to engine oil lines).
References：
The source of this content consists of three parts: core authoritative sources, universal industry standards, and summarized practical experience. No non-authoritative self-media or forum content is cited. Details are as follows:
Great Wall Haval: The original factory service manuals (including data from WIS/ETKA-like technical systems) for models such as H6/H9/F7. The core references include the torque of mounting bolts (22–25 N·m), the torque of main power terminals (15–20 N·m), power-off/wiring sequence, and belt tensioning standards.
Mitsubishi: The original factory service manuals for models such as Lancer/Outlander/Pajero, which clearly specify the torque of main mounting bolts (23–27 N·m), electrical connection specifications, and operational requirements for automatic tensioners.
These are dedicated installation guidelines provided with new alternators. They include compatible vehicle models, replacement requirements for seals (O-rings/insulating gaskets), and wire harness interface specifications, which are fully consistent with the provisions in the factory service manuals.
These documents cover the basic safety operations of the charging system (such as power-off protection and restrictions on consecutive startups) and the procedures for removing and reinstalling the negative battery terminal, serving as the source of general safety clauses.
Consensus Standards in the Automotive Maintenance Industry: General operational guidelines to avoid faults, such as cleaning of mounting surfaces, symmetrical pre-tightening of bolts, secure fixation of wire harnesses to prevent interference, and belt tension adjustment (2–5 mm deflection).
Universal Specifications for Electrical System Installation: Industry-accepted requirements, such as the wiring sequence of "connecting thin control wires first, then thick main power cables" (to prevent electric arcs), insulation protection for terminals, and load test standards (voltage drop ≤ 0.5 V).
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