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Type :
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Altemator
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Specification :
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12V 90A
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Pulley :
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7pk
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Brand :
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nuojin
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Number :
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37300-4A700
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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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This method is applicable to the replacement and installation of 12V alternator assemblies for Hyundai and Kia passenger cars and compact SUVs equipped with 1.4L/1.6L/1.8L engines. The operation follows the core sequence of power-off protection → cleaning and positioning → main unit fixation → belt routing and tensioning → electrical connection → trial operation and re-inspection. Key parameters are standardized to meet the needs of both professional maintenance personnel and DIY enthusiasts.
Turn off the engine and wait for it to cool down to room temperature to prevent scalding from high-temperature components.
Disconnect the negative battery cable and mark it clearly to avoid short circuits that could burn electrical components during installation.
If vehicle lifting is required, secure the vehicle with a lift or a jack plus safety stands. Never support the vehicle with a jack alone.
Basic tools: Socket wrenches (10/12/14/17/19mm), open-end/box-end wrenches, torque wrench, ratchet wrench, extension bar, universal joint
Special tools: Belt tensioning tool (or crowbar), multimeter
Auxiliary materials: Insulating tape, cleaning cloths, thread locking adhesive (optional), rust inhibitor (optional)
Qualified alternator assembly (verify that the rated power and voltage on the nameplate match those of the original vehicle).
Matching parts: Main alternator mounting bolts, adjusting bracket bolts, belt tensioner (replace if aged or jammed), OEM-spec multi-ribbed belt.
Auxiliary supplies: Flat washers and spring washers (for B+ terminal connection).
Alternator mounting position: Located at the front end of the engine, fixed jointly by the main mounting bracket and adjusting bracket, and linked to the crankshaft pulley, water pump pulley and tensioner via a multi-ribbed belt.
Cleaning requirements: Remove oil stains, rust and impurities from the alternator mounting base and bracket contact surfaces. Apply a thin layer of rust inhibitor if necessary to ensure tight fit without gaps.
Place the alternator into the mounting base, align the bolt holes with the main bracket, insert the main mounting bolts and hand-tighten for pre-fixation (do not fully tighten temporarily to reserve allowance for belt tension adjustment).
Install the adjusting bracket, align its connecting holes with the engine block and alternator, insert the adjusting bolts and hand-tighten them.
Routing specifications: Strictly follow the OEM belt routing diagram on the inner side of the engine hood or fender. Route the multi-ribbed belt around the crankshaft pulley → water pump pulley → tensioner → alternator pulley in sequence. Incorrect or reverse routing is prohibited.
Tension adjustment:
Use a belt tensioning tool or crowbar to pry the alternator (or adjust the tensioner) to achieve the specified belt tension.
Without a tension gauge: Press the middle section of the belt; the deflection should be controlled at 10–15mm. With a tension gauge, follow the calibrated value in the vehicle maintenance manual.
Bolt tightening: After confirming correct belt routing, use a torque wrench to tighten the adjusting bracket bolts first, then the main mounting bolts, to the standard torque of 25–30N·m.
Identify the terminals on the rear of the alternator:
B+ terminal: Thick cable interface, connected to the positive battery terminal.
Excitation terminal: Thin wire plug interface, responsible for transmitting the alternator excitation signal.
Connection specifications:
For the B+ terminal: Install a flat washer + spring washer, tighten the fixing nut to ensure no looseness and prevent electric arcs caused by poor contact.
For the excitation terminal: Fully insert the plug into the slot until the buckle locks in place, then gently pull the plug to verify it does not fall off.
Re-inspection: Check that all terminals have no exposed copper wires; wrap them with insulating tape for protection if necessary.
Reconnect the negative battery cable and clear all tools and debris from the engine compartment.
Start the engine and observe at idle speed: No abnormal noise from the alternator, no belt deviation or slipping, and no obvious vibration of the unit.
Voltage measurement: Use a multimeter to measure the alternator output voltage; the normal value at idle speed is 13.5–14.5V. If the voltage is abnormal, recheck the belt tension, wiring connections or alternator performance.
Road test re-inspection: After the vehicle has traveled 50–100km, recheck the bolt tightness and belt condition to eliminate loosening hazards.
Disconnect the negative battery cable for the entire installation and disassembly process. Never plug or unplug alternator wiring terminals with power on. Live operation can easily burn out the alternator rectifier, voltage regulator and vehicle electronic control unit (ECU), resulting in irreversible faults.
When connecting the thick cable to the B+ terminal, a flat washer plus a spring washer must be installed. Recheck to ensure no looseness after tightening the fixing nut. Poor contact will generate electric arcs, which will not only burn the terminal but also may cause circuit overheating and even fire risks.
Fully insert the excitation plug into the slot until a buckle-locking click is heard. Gently pull the plug after installation to confirm it does not fall off. If the plug loosens during vehicle operation, it will directly cause the alternator to stop generating power, leading to battery depletion and vehicle breakdown.
Tighten the main mounting bolts and adjusting bracket bolts to the standard torque of 25–30N·m (refer to the vehicle-specific manual for exact values). Insufficient torque will cause alternator vibration and belt slipping; excessive torque may damage the alternator housing or the threads of the engine mounting base.
Thoroughly remove oil stains, rust and impurities from the alternator mounting base and bracket contact surfaces before installation. Apply a thin layer of rust inhibitor if necessary. Residual foreign matter on contact surfaces will lead to excessive fit gaps, causing abnormal vibration and noise during operation.
When adjusting belt tension, apply force with a crowbar on the metal bracket part of the alternator. Never pry directly on the housing. The housing material is thin; forced prying will cause deformation, which in turn will jam the internal rotor and result in alternator scrapping.
References：
For the previously provided Installation Method for 12V Alternator of Hyundai/Kia and Key Precautions, the core sources and traceability information are listed below in order of priority for easy verification.
Key parameters and process frameworks, including power-off sequence, definitions of B+/excitation terminals, bolt torque, belt routing and tensioning, and idle voltage range (13.5–14.5 V), are all derived from this manual.
It is applicable to common engine models (1.4L/1.6L/1.8L) such as Elantra, Elantra AD, Verna, Mistra, K3 and K5, with engine codes including G4FG, G4LC and G4FD.
The corresponding chapters and clauses in the manual can be located by vehicle model year + engine code for accuracy verification.
Details such as tool lists, cleaning and rust prevention measures, lifting safety protocols, trial run inspections, and troubleshooting checklists are refined and optimized from universal industry processes. The purpose is to enhance readability and operability for both professional maintenance personnel and DIY enthusiasts.
This text is an original compilation and adaptation based on the above-mentioned materials, and is not directly copied from any publicly available online articles or documents. For verification, please refer to the original factory maintenance manual of Hyundai/Kia corresponding to the model year (Chapter on Charging System).
If you can provide the specific vehicle model year, engine displacement and engine code, we can help locate the corresponding chapter number, page number or clauses in the manual, as well as provide accessible reference channels and keywords for further accuracy verification.
Check the original factory manual: Search for the "Charging System/Alternator" chapter using the vehicle model year + engine code (e.g., G4FG), and verify the B+ terminal connection method, bolt torque, belt routing diagram and idle voltage range.
Measure with a multimeter: A normal idle voltage ranges from 13.5–14.5 V. If the reading is outside this range, recheck the belt tension and wiring connections.
Verify bolt torque: The typical torque for the main mounting bolts and adjusting bracket bolts is 25–30 N·m (refer to the vehicle-specific manual for exact values) to avoid under-tightening or over-tightening.
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