Parts for alternators and generators

Alternator and generator parts are key components of the electrical system, responsible for generating the electricity needed to power the vehicle's electrical devices and charge the battery. A properly functioning alternator and generator ensure power stability and long life for the entire electrical system. At the Global Parts automotive store, you'll find a wide selection of used car parts, including alternator and generator parts, perfectly matched to brands like BMW, Audi , Mercedes, Volkswagen, Mini, and more .

What is an alternator and how does it work in practice?

A car alternator is an electromechanical device that converts mechanical energy (from the engine and V-belt drive) into AC electricity, which is then rectified to DC. The standard charging voltage in a 12V system is typically 13.8–14.5V, while in a 24V truck, it's approximately 27.5–28.5V . Modern alternators used in models such as the Audi A3 8p alternator, Audi A4 B6 alternator, Audi A6 C6 alternator or BMW E60 alternator achieve current efficiency from 90 A to even 180 A, depending on the engine version and equipment (air conditioning, heated seats, multimedia systems). The alternator consists of, among others:

• rotor,
• stator,
• bridge rectifier (diode),
• voltage regulator,
• pulley (often with a freewheel). Thanks to this, the system ensures stable power supply to the ECU, lighting, ABS/ESP systems and battery charging while driving.

What are the functions of alternator and generator parts ?

Alternator and generator parts are essential for the proper operation of a vehicle's electrical system:

• Power Generation – Alternators and generators convert mechanical energy into electrical energy, providing power for vehicle systems.
• Battery charging – Generates the current necessary to maintain the appropriate battery charge level.
• Voltage Regulation – Voltage regulators maintain a constant current level, protecting electrical systems from overloading.
• Failure Prevention – High-quality parts such as brushes, bearings and pulleys support the reliability of alternators and generators.

Typical alternator parameters and compatibility

When selecting an alternator or its components, technical parameters and compatibility with the specific drive unit should be taken into account. The most important data include:

• rated voltage (12V / 24V),
• maximum charging current (e.g. 120A, 140A, 150A),
• pulley type (classic or with OAP clutch),
• number of belt grooves (e.g. 6PK),
• control system (classic regulator or LIN/BSS).

Sample parameter table

Vehicle model	Typical intensity	Tension	Application
Audi A3 8P alternator	90–140 A	12V	Engines 1.9 TDI / 2.0 TDI / 1.6 MPI
Audi A4 B6 alternator	120–150 A	12V	1.8T / 1.9 TDI / 2.5 TDI
Audi A6 C6 alternator	140–180 A	12V	2.7 TDI / 3.0 TDI
BMW E60 alternator	150–180 A	12V	2.0d / 3.0d / 2.5i

This data facilitates adjustment in terms of performance, installation and compatibility with the vehicle's electrical system.

Why is it worth taking care of alternator and generator parts ?

Damage or wear to alternator or generator parts can lead to power issues and shorten battery life. Typical symptoms include:

• Discharged battery – May be due to faulty charging.
• Battery light on dashboard – Indicates problems with the alternator or generator.
• Unusual noises – Squeaks or grinding sounds may indicate worn bearings or drive belt.
• Voltage fluctuations – May indicate problems with the voltage regulator. If you need a replacement, you'll find the right used car parts at Global Parts that will restore the full functionality of your electrical system.

Used alternator – economics and technical parameters

A used alternator is a fully functional component of the charging system, maintaining its operating parameters in accordance with the manufacturer's specifications. In practice, this means maintaining the correct charging voltage and current output adapted to the specific vehicle model. From an economic point of view, choosing such a solution can mean savings of 30–60% compared to a new part, while maintaining assembly compatibility (brackets, electrical connectors, pulley diameter). In vehicles such as the Audi A3, Audi A4 B6, Audi A6 C6 or BMW E60, the alternator works directly with the battery, starter and engine control module, so its correct adjustment affects the stability of the entire electrical system.

How to choose the right parts for alternators and generators ?

When choosing parts for alternators and generators, there are several key aspects to pay attention to:

• Vehicle-specific fit – Every electrical system has its own specific technical requirements. At Global Parts, you'll find alternator and generator parts perfectly suited to BMW, Audi, Mercedes, Volkswagen, Mini , and more .
• Technical condition – Used parts should be fully functional, free from mechanical and electrical damage.
• Alternator or Generator Type – Make sure the parts you choose are compatible with your vehicle's model and specifications.

Why choose used alternator and generator parts ?

Used car parts, such as used alternator and generator parts, is an economical solution that allows you to save money while maintaining high quality. By choosing used electrical components, you gain:

• Lower costs – Used parts are much cheaper than new ones, but offer just as high quality.
• Ecology – Recycling parts supports environmental protection and reduces waste.
• A wide range – In our store you will find used parts for alternators and generators for the most popular car brands.

How to take care of alternator and generator parts ?

To ensure that alternator and generator parts function reliably for a long time, it is worth following a few rules:

• Regular inspections – Check the condition of the alternator and generator during technical inspections.
• Maintain drive belt tension – Make sure the belt is properly tensioned to avoid overloading the system.
• Avoid electrical overloads – Too many devices connected at once can overload the system.
• Replace on time – Damaged brushes, bearings, or voltage regulators should be replaced to prevent more serious failures. If you need a replacement, Global Parts has the right used car parts to ensure the durability and efficiency of your electrical system.

FAQ - Frequently asked questions about alternators and generators

Question	Answer
What is a car alternator?	An alternator is a device that converts the mechanical energy of an engine into electrical energy, powering the vehicle's electrical system and charging the battery.
What voltage should the alternator produce?	In a 12V system, the correct charging voltage is usually between 13.8 and 14.5 V with the engine running.
How to check if the alternator is charging?	You can measure the battery voltage with a meter – with the engine running it should be higher than 13.8 V.
Does the audi a3 8p alternator fit other models?	In some engine versions, compatibility is possible if the parameters (A, V, mounting, connectors) are identical.
What is the difference between a 120A and a 150A alternator?	The difference is in the maximum current capacity – 150A better supports vehicles with more extensive electrical equipment.
What does alternator compatibility depend on?	On the engine model, installation voltage, control type and pulley type.

Summary: Alternator and Generator Parts at Global Parts Automotive Store

Alternator and generator parts are key components of a vehicle's electrical system, supporting its reliability and efficiency. By maintaining their technical condition, you can avoid power problems and extend the life of the entire electrical system. The Global Parts automotive store invites you to browse our extensive selection of genuine used car parts . Whether you're looking for car parts for BMW , Audi , Volkswagen , Mercedes, Mini , or others, you'll find them at competitive prices. We strive to ensure every customer finds the right parts for their car, and if you have any questions or concerns about selecting the right components, we're happy to help! Please contact us – we're here to help! For more information and interesting facts, visit our automotive blog .