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Type :
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Altemator
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Specification :
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12V 130A
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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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37300-4A320
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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 guide is applicable to the assembly replacement and installation of 12V alternators for Beijing Hyundai/Kia passenger cars and compact SUVs equipped with common engine models (1.4L/1.6L/1.8L, etc.). The operation shall be performed in the sequence of power-off → cleaning and positioning → main unit fixation → belt routing and tensioning → electrical connection → reset and trial operation. Key parameters and safety precautions are uniformly marked for easy reference by DIY enthusiasts and maintenance personnel.
Turn off the engine and wait for it to cool down to room temperature.
Disconnect the negative battery cable and mark it for easy identification.
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.
Socket wrenches (10/12/14/17/19mm)
Open-end/box-end wrenches
Torque wrench
Ratchet wrench, extension bar, universal joint
Belt tensioning tool / crowbar
Multimeter
Insulating tape
Cleaning cloths
Thread locking adhesive (optional)
Qualified alternator assembly
Matching parts: mounting bolts, adjusting bracket bolts, belt tensioner (replace if aged), multi-ribbed belt (complying with original factory specifications)
Flat washers, spring washers
Rust inhibitor (optional)
The alternator is usually located at the front end of the engine, fixed by the main bracket and adjusting bracket, with the belt linked to the crankshaft, water pump and tensioner.Clean oil stains and rust on the mounting surfaces; apply a thin layer of rust inhibitor if necessary to ensure tight fit.
Place the alternator in position, align the bolt holes of the main bracket, insert the main mounting bolts and hand-tighten them for pre-fixation (do not fully tighten temporarily to leave room for fine adjustment).
Install the adjusting bracket, align its connecting holes with those on the engine block and alternator, insert the adjusting bolts and hand-tighten them.
Strictly follow the original belt routing diagram on the inner side of the hood or fender. Route the belt around the crankshaft pulley, water pump pulley, tensioner and alternator pulley in sequence. Incorrect or reverse routing is prohibited.
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 shall be 10–15mm.
With a tension gauge: Follow the value specified in the maintenance manual (usually XX–XX N for multi-ribbed belts).
After confirming the belt routing is correct, tighten the adjusting bracket bolts first, then the main mounting bolts, in accordance with the torque specified in the manual (25–30N·m for most models; refer to the vehicle-specific maintenance manual for exact value).
Identify the terminals on the rear of the alternator:
B+ terminal (thick wire, connected to the positive battery terminal)
Excitation/plug terminal (thin wire)
For the B+ terminal: Install a flat washer and a spring washer, then tighten the nut to ensure no looseness.
Fully insert the excitation plug into the slot until it clicks into place; gently pull it to confirm it is locked.
Inspect all connectors for no exposed wires or looseness; wrap them with insulating tape if necessary.
Reconnect the negative battery cable and clear all tools and debris from the engine compartment.
Start the engine and observe the following:
Use a multimeter to measure the output voltage: 13.5–14.5V at idle speed. If the voltage is abnormal, recheck the belt tension, wiring connections and alternator performance.
Re-inspect the bolt tightness and belt condition after the vehicle has traveled 50–100km.
Power-off Requirement Throughout the ProcessDisconnect the negative battery cable during the entire installation and disassembly process. It is strictly forbidden to plug or unplug the alternator wiring terminals with power on; otherwise, it will easily burn out the alternator rectifier, voltage regulator and vehicle electronic control unit (ECU).
Requirements for B+ Terminal ConnectionWhen connecting the thick cable to the B+ terminal, a flat washer and a spring washer must be installed. After tightening the fixing nut, recheck to ensure there is no looseness. Poor contact will generate electric arcs, which will not only damage the terminal but also may cause circuit overheating and even fire risks.
Locking Inspection of Excitation PlugFully insert the excitation terminal plug into the slot until a click sound of the buckle locking is heard. After installation, gently pull the plug to confirm it does not fall off, so as to prevent the alternator from stopping power generation due to plug loosening during vehicle operation.
Strict Control of Bolt TorqueTighten the alternator's main mounting bolts and adjusting bracket bolts according to the torque specified in the vehicle maintenance manual (the common standard is 25–30N·m). Insufficient torque will cause alternator vibration and belt slipping; excessive torque may damage the alternator housing or the threads of the engine mounting base.
Cleaning and Rust Prevention of Mounting SurfacesBefore installation, must clean oil stains, rust and impurities on the contact surfaces of the alternator mounting base and bracket. Apply a thin layer of rust inhibitor if necessary to ensure tight fit of components and avoid operation vibration caused by gaps.
Prohibition of Prying the Housing to Adjust TensionWhen adjusting the belt tension, it is strictly forbidden to directly pry the alternator housing with a crowbar. Instead, apply force to the metal bracket part of the alternator to prevent housing deformation from affecting the normal operation of the internal rotor.
Routing Must Follow the Original Factory DiagramInstall the belt in strict accordance with the original factory routing diagram on the inner side of the engine hood or the fender. Incorrect or reverse routing will cause the alternator to reverse and stop generating electricity, lead to abnormal belt wear, and even damage linked accessories such as the water pump and air conditioner compressor.
Tension Control Within a Reasonable RangeWithout a tension gauge, the deflection of the belt's middle section when pressed should be controlled at 10–15mm; if a tension gauge is available, operate according to the calibrated value in the manual. An overly loose belt tends to slip and produce abnormal noise, while an overly tight belt will accelerate the wear of the alternator bearings and pulleys, shortening their service life.
Belt Specifications Must Match the Original Factory StandardsWhen replacing the belt, select a multi-ribbed belt that matches the original vehicle specifications. Never mix belts of different brands, models or lengths. Before installation, check the belt surface to ensure there are no cracks, aging or delamination.
Alternator Model VerificationDifferent displacement models of Hyundai (1.4L/1.6L/1.8L, etc.) are equipped with different alternator models. Before installation, verify that the parameters on the alternator nameplate (rated power, rated voltage) are consistent with those of the original vehicle, so as to avoid charging system malfunctions caused by model mismatch.
Tensioner Condition InspectionIf replacing the belt tensioner at the same time, rotate the tensioner to check whether the bearing runs smoothly without jamming or abnormal noise; otherwise, it will affect the stability of belt tension and cause belt jumping or slipping problems.
References：
This document is an original summary compiled for easy verification and traceability, with its core basis and sources listed below in order of priority.
Original Factory Maintenance Manual of Beijing Hyundai/Kia (Chapter on Charging System/Alternator)Key parameters and process frameworks, including power-off sequence, terminal definitions (B+ and excitation), 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 and Mistra.
General Specifications and Practical Experience in the Automotive Maintenance IndustryDetails including tool lists, cleaning and rust prevention measures, lifting safety protocols, trial run inspections, and troubleshooting checklists are refined from universal industry processes. The aim is to enhance readability and operability for both DIY enthusiasts and professional maintenance personnel.
This text is a 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 (e.g., the Charging System chapter for engines with codes such as G4FG/G4LC/G4FD).
If you can provide the specific vehicle model year, displacement and engine code, we can help locate the corresponding chapter number, page number or clauses in the manual, and provide accessible reference channels and keywords for further accuracy verification.
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