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Type :
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Alternator
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Specification :
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12V 110A
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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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TG11C015
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Quality :
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Remanufacture
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Delivery time :
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30 days
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The installation of Volkswagen 12V 110A alternator shall be carried out in accordance with the sequence of "power off → remove old unit → clean → install new unit → wiring → install belt → adjust tension → fasten → restore power → test". Fasten according to torque throughout the process to ensure belt alignment and tension compliance.
Socket/box-end wrench, torque wrench, belt tensioner tool, multimeter, marker pen/photography equipment, rag/cleaner.
New alternator (12V 110A), new belt (if necessary), anti-loosening agent, terminal protector, bolts (matching the vehicle model).
Turn off the engine, pull the handbrake, shift to P/N gear, and disconnect the negative battery terminal; operate on a cold engine to prevent scalding and pinching.
Disconnect the negative battery terminal and mark the positions of the wire harnesses; loosen the tensioner to remove the belt; disconnect the B+, D+/F, ground wires and plugs; loosen the fixing bolts and take off the old alternator.
Clean the bracket, bolt holes and sliding sleeves; place the new alternator in position and initially tighten the fixing bolts (do not fully tighten).
Connect B+ to the positive battery terminal; connect D+/F to the charging light/regulator; connect the ground wire to the vehicle body; ensure the plug is properly seated; apply terminal protector to the terminals and tighten according to torque.
Install the belt according to the routing; use a belt tensioner tool to adjust to the compliant tension (press 10–15mm or measure frequency); align the belt pulley to avoid eccentric wear.
Tighten the fixing bolts according to the vehicle model's torque specification; reconnect the negative battery terminal.
Charging light remains on: Inspect D+/F, ground connection, and belt slippage; test excitation and power generation output.
Unstable voltage: Check B+ terminal looseness, belt tension, regulator/rectifier; replace the alternator if necessary.
Abnormal noise: Belt eccentric wear/slippage or bearing damage; adjust tension or replace the belt/bearing.
Perform power-off operation throughout the process to prevent short circuit/electric shock.
Verify bolt positions, torque, and belt routing against the vehicle model's service manual.
Conduct a road test after installation to monitor voltage and charging light for stability.
Before installation, the negative battery terminal must be disconnected, and it is necessary to wait for 5–10 minutes to allow residual power in the vehicle's electronic control system to dissipate completely. This prevents short circuits during wiring that could burn out the alternator regulator or on-board ECU.
Do not plug or unplug the alternator wire harness connector when the battery is not disconnected, to avoid instantaneous high voltage that may damage electronic components.
The operation area must be kept dry; installation in rainy or humid environments is prohibited to prevent water from entering the alternator and causing short circuits.
Tools with insulated handles should be used to avoid short circuits caused by metal tools simultaneously touching the alternator's B+ terminal and the vehicle body's ground.
Operate on a cold engine; high-temperature components in the engine compartment (such as the exhaust pipe) can cause scalds, and high temperatures accelerate belt aging.
Before disassembly, use a marker to mark the direction and position of the belt on the pulley, or take clear photos. This ensures the new belt follows the original factory routing and prevents belt slippage or abnormal noise due to reverse installation.
Mark the installation positions and sequence of the alternator fixing bolts (some models use eccentric bolts for adjusting belt tension) to avoid positioning deviations after reinstallation.
The alternator bracket mounting surface and bolt holes must be thoroughly cleaned of oil, rust, and sediment with a cleaner. Failure to do so will cause bolts to loosen after tightening, leading to alternator vibration and abnormal noise.
Wire harness connectors and terminals should be wiped clean with alcohol. Severely oxidized terminals must be coated with conductive paste to prevent unstable power generation caused by poor contact.
Inspect the packaging integrity of the new alternator; confirm that the rotor and stator are free of collision deformation, the bearing rotates without jamming or abnormal noise, and the wiring terminals are free of oxidation and rust.
Do not strike the alternator housing or pulley with tools during installation, to prevent damage to precision components such as the internal rectifier and regulator.
Fixing bolts should be tightened in diagonal sequence in stages to avoid deformation of the alternator housing due to one-sided stress, which affects bearing coaxiality.
The B+ terminal wiring must use factory-specification copper core wires, and flat washers and spring washers must be installed. Tighten to a torque of 15–25 N·m; loose connections will cause terminal overheating and ablation, and in severe cases, fire.
The ground wire must be directly connected to the vehicle body's dedicated grounding point (do not randomly ground to non-earthing parts of the engine block) to ensure the grounding resistance is < 0.5Ω. Otherwise, faults such as flashing charging lights and unstable voltage will occur.
Wire harnesses should be fixed with clips to avoid contact with rotating components such as pulleys and fans, preventing wire harness wear and short circuits.
Belt tension must be strictly controlled within the specified range: when applying 10kgf of pressure to the midpoint of the belt (midpoint between two pulleys), the deflection should be 10–15mm; or measure the frequency with a belt tension meter to be 40–60Hz.
Excessively loose tension will cause belt slippage and insufficient power generation; excessively tight tension will accelerate wear of the alternator bearing and water pump bearing, shortening their service life.
After installing the belt, rotate the engine 2–3 times and check that the belt is aligned with the pulley edges without deviation or warping.
After reconnecting the negative battery terminal, first turn on the ignition switch (without starting the engine) and observe whether the instrument charging light illuminates normally; after starting the engine, the charging light should turn off within 3 seconds. If not, stop the engine immediately to troubleshoot faults.
Measure the battery terminal voltage at idle with a multimeter; the normal range is 13.8–14.7V. When high-power loads such as headlights and air conditioners are turned on, the voltage must not be lower than 13.5V. If it is, it indicates insufficient belt tension or abnormal alternator performance.
References：
This document of "Precautions for Installation of Volkswagen 12V 110A Alternator" is a comprehensive compilation based on Volkswagen's official workshop manuals and industry universal specifications, rather than a verbatim excerpt from a single public document. The specific sources and basis are as follows:
Core processes and parameters such as power-off operation, belt marking, torque fastening, wiring specifications, and charging tests are all derived from the alternator disassembly and installation chapters of Volkswagen's various vehicle model manuals (e.g., Golf, Tiguan, Sagitar, etc.).
Key requirements including operation after power-off, belt direction marking, B+ terminal torque (15–25 N·m), fixing bolt torque (25–45 N·m), and voltage range (13.8–14.7V) are consistent with the provisions of the manual.
SAE J1171 is cited as a reference for electrical safety. However, it should be noted that this standard actually applies to external ignition protection of marine electrical equipment and has no direct corresponding clauses for automotive alternator installation. Here, it is cited for general safety principles only.
Belt tension parameters (10–15mm deflection under pressure, 40–60Hz via frequency measurement) and ground resistance requirements are universal empirical values in the automotive maintenance industry, with no direct correspondence to a single official document.
Some operation steps and precautions can be found in similar expressions in alternator installation guides on automotive maintenance platforms (e.g., Auto Master, Pacific Auto Network), but these are all secondary compiled contents and not original sources.
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