What is the construction and purpose of alternators and generators?

Alternators and generators are devices mounted to the engine, designed to generate electrical energy for the vehicle's needs. A typical unit consists of a housing, rotor, stator, diode bridge, voltage regulator, pulley, and electrical connectors. This component operates in the charging system and works with the battery and the car's onboard electrical installation.

What are alternators and generators used for?

Alternators and generators are used to power electrical consumers while the engine is running and to charge the battery. They are responsible for the stable voltage needed for the operation of lights, control units, heating, fans, and other electrical systems. When they operate incorrectly, voltage drops, starting problems, and equipment malfunctions may occur.

What role does the voltage regulator play?

The voltage regulator is a component that controls the alternator's operation and maintains the correct charging level in the electrical system. It limits excessive voltage spikes and stabilizes system operation during varying engine speeds. Depending on the design, it may be integrated with the alternator or appear as a replaceable element working with the brushes.

How to choose an alternator or generator for a specific car?

It is safest to compare the OEM part number, interchangeable numbers, fuel type, engine version, and mounting type. It is also worth checking the electrical connector, pulley diameter, and current output. If there are differences between equipment versions, verification by VIN is helpful.

What symptoms indicate problems with an alternator or generator?

Typical symptoms include a battery warning light, flickering lights, weak charging, and noise coming from the engine accessory area. In some cases, there are also problems with starting the car or unstable operation of electrical devices. During diagnostics, it is worth checking the charging voltage, belt condition, and electrical connections.

What should be checked before installing a used alternator?

Before installation, it is good to compare mounting points, the plug, the pulley, and part markings with the removed unit. You should also assess the condition of the housing, threads, connectors, and any signs of overheating. It is also important to check cooperating elements, such as the accessory belt or power cables.

Alternators and generators

At Global Parts, we offer a wide selection of original used car parts, including alternators and generators for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen, and others. Our alternators and generators undergo quality control to ensure you receive a top-quality product.

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Audi A4 B7 Petrol Engine Alternator Generator Electric Unit 14V 140A 06B903016AB

£37.95

Free delivery: Jul 28

If paid before 14:00

Part no. 03C903023S

Audi A1 8X 1.4 TSI CAXA Alternator 03C903023S

£28.95

Free delivery: Jul 28

If paid before 14:00

Part no. 059903015T

Audi Q7 4L A8 D4 Water Cooled Alternator 190A 059903015T

£56.95

Free delivery: Jul 28

If paid before 14:00

Part no. 04L903023K

Audi A3 8V Volkswagen Golf Mk7 Alternator Generator 140A 1.6 2.0 TDI 04L903023K

£70.95

Free delivery: Jul 28

If paid before 14:00

Audi Q7 4L Diesel Alternator Generator Engine Electrical Unit 059903018E

-40%

Part no. 059903018E

Audi Q7 4L Diesel Alternator Generator Engine Electrical Unit 059903018E

Promo price

£66.95

£40.17

Free delivery: Jul 28

If paid before 14:00

Audi A4 B9 A5 F5 Alternator Generator 2.0 TFSI Valeo 14V 210A 06L903018JX

-40%

Part no. 06L903018JX

Audi A4 B9 A5 F5 Alternator Generator 2.0 TFSI Valeo 14V 210A 06L903018JX

Promo price

£94.95

£56.97

Free delivery: Jul 29 – Aug 5

If paid before 14:00

Audi Q7 4L Quattro Diesel 3.0 TDI ALternator Generator 180A Bosch 059903018K

-15%

Part no. 059903018K

Audi Q7 4L Quattro Diesel 3.0 TDI ALternator Generator 180A Bosch 059903018K

Product currently unavailable

Part no. 03L903023K

Audi A3 8V A4 A5 B8 Alternator Generator Electrical Unit Diesel 03L903023K

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Audi A5 8T Engine Alternator Generator 14V 140A Bosch 2.0 TFSI 06H903016L

-40%

Part no. 06H903016L

Audi A5 8T Engine Alternator Generator 14V 140A Bosch 2.0 TFSI 06H903016L

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Part no. 03G903016F

Audi A4 B8 2.0 TDI Alternator Generator 150A Diesel Engine Unit 03G903016F

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Part no. 03L903017E

Audi A4 B8 A5 8T Q5 8R Quattro Alternator Generator 2.0 TDI 03L903017

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Part no. 059903015P

Volkswagen Touareg Audi Q7 Water Cooled Alternator 190A 059903015P

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Part no. 03L903023A

Audi A3 8P Alternator Generator Diesel Engine Electrical Unit 03L903023A

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Part no. 079903015F

Audi S5 8T Quattro 4.2 FSI Petrol V8 CAUA Alternator Genarator Valeo 079903015F

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Part no. 03G903016EX

Audi A4 B8 2.0 TDI Alternator Generator 03G903016EX

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Part no. 059903016P

Audi Q7 4L Alternator Generator Engine 3.0 TDI Diesel 059903016P

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Part no. 079903021JX

Audi S8 D3 S6 C6 Alternator Water Cooled 190A 14V 5.2 FSI V10 079903021J

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Part no. 4N0903028M

Audi Q7 4M Water Cooled Alternator Generator Starter Unit 48V 4N0903028M

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Part no. 03G903016E

Audi A4 B8 A5 8T Alternator Generator 14V 140A 03G903016E

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Part no. 04C903023L

Audi A1 8X 1.2 TFSI CBZA Petrol Engine Alternator Generator 04C903023L

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Part no. 079903018X

Audi A4 B7 4.2 FSI V8 Petrol Engine Alternator Generator 079903018X

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Part no. 03C903023A

Audi A1 8X A3 8P Alternator Generator 1.4 TFSI Petrol Engine CAVG 03C903023A

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Part no. 04L903017A

Audi A4 B8 2.0 TDI CNHC Diesel Alternator Generator 04L903017A

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Part no. 03L903017E-1

Audi A4 B8 Avant 2.0 TDI Quattro Alternator Generator 03L903017

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Part no. 06F903023FX

Audi A4 B6 B7 A1 8X 1.9 TDI 2.0 TDI Engine Alternator Generator 06F903023FX

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Part no. 059903024A

Audi A4 B9 Alternator Generator Diesel Engine 3.0 TDI 059903024A

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Part no. 04C903023K

Volkswagen Golf MK 7 Audi A3 8V 1.4 Alternator Petrol 04C903023K

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Part no. 059903016D

Audi A4 B7 3.0 TDI Diesel Alternator Generator Engine 059903016D

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Part no. 059903018K-1

Audi Q7 4L Quattro Diesel 3.0 TDI ALternator Generator 180A Bosch 059903018K

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Part no. 03C903023T

Audi A1 8X A3 8P VW Passat B7 Alternator Generator 1.4 TFSI Engine 03C903023T

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Part no. 03L903016A

Audi Q5 8R 2.0 TDI Alternator Generator 14V 180A Valeo 03L903016A

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Part no. 059903018R

Audi A6 C7 3.0 TDI CLAA Alternator Generator Engine Unit Hitachi 059903018R

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Part no. 03G903016G

Audi Q5 8R 2.0 TDI CJCA Diesel Engine Alternator Generator 03G903016G

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Part no. 03G903016L

Audi A6 C6 FL CAGB Diesel Engine Alternator Generator Bosch 14V 180A 03G903016L

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Part no. 06L903018H

Audi A4 B9 A5 F5 Alternator Generator Valeo 2.0 TFSI DDWA 06L903018H

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Part no. 04C903023T

Audi A1 8X 1.4 TFSI CZCA Alternator Generator 04C903023T

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Part no. 06H903018J-1

Audi A4 B8 A5 8T Q5 8R Alternator Generator Motor Petrol 06H903018J

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Part no. 06J903023A

Audi A3 8V VW Golf Mk7 Alternator Generator 14V 140A 2.0 TFSI 06J903023A

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Part no. 06L903027

Audi Q5 FY Alternator Generator Valeo 2.0 TFSI 06L903027

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Part no. 06K903023G

Audi TT FV Engine Alternator Generator Electric 14V 150A 2.0 TFSI 06K903023G

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Part no. 079903021E

Audi A4 B7 4.2 BBK Petrol Engine Alternator Generator 079903021E

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Part no. 059903018E-1

Audi A6 C6 Q7 4L Diesel Alternator Generator 14V 180A Electrical Unit 059903018E

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Part no. 06E903016N

Audi A4 B8 3.2 FSI Alternator Generator 06E903016N

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Part no. 03G903016N

Audi A6 C6 2.0 TDI Alternator Generator 180A 14V Diesel Engine Unit 03G903016N

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Part no. 04L903017E

Audi A4 8K 2.0 TDI Diesel Engine Alternator Generator 04L903017E

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Part no. 03C903024F

Alternator Audi A3 8P VW Passat B7 Engine Generator 1.4 TSI 03C903024F

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Part no. 4N1903028A

Audi A6 C8 A7 4K A8 D4 Alternator Generator 4N1903028A

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Part no. 06H903017T-1

Audi A5 8T A4 B8 2.0 TFSI Engine Alternator Generator 06H903017T

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Part no. 059903016E

Audi A4 B8 A5 Q5 Sportback Alternator Generator 059903016E

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Part no. 06F903023H

Audi A4 B7 A6 C6 Alternator Generator 1.9 TDI Diesel 06F903023HX

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Part no. 07K903023J

Audi RS3 8V 2.5 TFSI Alternator 14V 180A 07K903023J

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Part no. 03C903023A-1

Audi A1 8X A3 8P Alternator Generator 1.4 TFSI Petrol Engine CAVG 03C903023A

Product currently unavailable

Part no. 04L903017A-1

Audi A4 B8 3.0 TDI CAPA Diesel Alternator 04L903017A

Product currently unavailable

Part no. 06E903016S

Audi A4 B8 3.2 FSI Alternator Generator 06E903016S

Product currently unavailable

Part no. 06B903016AF

Audi A3 8P A4 B7 TT 8J Alternator Generator 140A 14V FSI TFSI Petrol 06B903016AF

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Part no. 059903019N

Audi A5 8T Alternator Generator Electrical Unit 150A 14V 3.0 TDI 059903019N

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Part no. 03F903023D

Audi A3 8V 2.0 TDI CRLB Diesel Alternator 03F903023D

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Part no. 059903016G

Audi A4 B8 A5 8T Q5 8R Alternator Generator 3.0 TDI Diesel 059903016G

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Part no. 06J903023B

Audi Q3 8U Petrol Alternator Generator 14V 140A 06J903023B

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Part no. 03G903016A

Audi A6 C6 2.0 TDI Alternator Generator 180A 14V 03G903016A

Product currently unavailable

Part no. 06D903016A

Audi A4 B7 Alternator Generator Unit 140A 14V 1.8 2.0 Petrol Engine 06D903016AB

Product currently unavailable

Part no. 059903019N-1

Audi A5 8T Alternator Generator Electrical Unit 150A 14V 3.0 TDI 059903019N

Product currently unavailable

Part no. 03L903143K

Audi A4 B8 2.0 TDI Alternator Mount Tensioner Pulley Bracket Support 03L903143K

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Part no. 03G903016E-1

Audi A4 B8 A5 8T Alternator Generator 14V 140A 03G903016E

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Part no. 06H903016L-1

Audi A5 8T Engine Alternator Generator 14V 140A Bosch 2.0 TFSI 06H903016L

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Part no. 04L903018-1

Audi A4 B9 A5 F5 Q5 FY A6 C8 A7 C8 Alternator Generator Valeo 04L903018A

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Part no. 06K903026B

Audi S3 8Y VW Golf MK8 R GTI Alternator Generator 2.0 TFSI DNF Petrol 06K903026B

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Part no. 06E903018M

Audi A6 C7 A7 4G Alternator Generator Hitachi 2.8 FSI 06E903018M

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Part no. 079903015P

Audi A7 S7 4G 4.0 TFSI Petrol Engine Alternator Generator 079903015P

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Part no. 04E903024N

Audi A4 B9 VW Polo Mk5 1.4 TFSI Petrol Alternator Generator Denso 04E903024N

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Part no. 059903018TX

Audi A7 4G 3.0 TDI Alternator Generator 059903018TX

Product currently unavailable

Part no. 06J903023A-1

Audi Volkswagen Seat Skoda Petrol Alternator Generator 14V 140A 06J903023A

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Part no. 06E903016N-1

Audi A4 B8 A5 8T Alternator Generator 140A 14V 3.2 FSI Petrol Engine 06E903016N

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Part no. 06D903016AB

Audi A4 B7 1.8 T BFB Petrol Engine Alternator Generator 06D903016AB

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Part no. 06K903026C

Audi A3 S3 8Y Engine Alternator Generator Electric Unit 14V 140A 06K903026C

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Part no. 06H903017EX

Audi A3 8P Engine Alternator Generator 14V 140A 1.8 TFSI CDAA 06H903017E

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Part no. 04C903023M

Audi A3 8V A1 S1 8X VW Jetta A6 Golf 5G Golf R 5G Petrol Alternator 04C903023M

Product currently unavailable

Part no. 04L903023L-1

VW Tiguan 5n Audi Q3 8U A3 8V Alternator Generator 14V 140A 2.0 TDI 04L903023L

Product currently unavailable

Part no. 04L903021G

Audi Q2 GA Diesel Engine Alternator Generator Assembly Bosch 04L903024T

Product currently unavailable

Part no. 04L903017

Audi A4 S4 8K A5 S5 8T 8F Alternator 150A 14V 2.0 TDI Diesel CGLC 04L903017

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Part no. 04L903017D

Audi A4 B8 A5 8F 2.0 TDI Diesel Engine Alternator Generator 04L903017D

Product currently unavailable

Part no. 079903021D

Audi A4 B6 4.2 BBK Petrol Engine Alternator Generator 079903021D

Product currently unavailable

Part no. 06H903017T

Audi A5 8T A4 B8 Engine Alternator Generator 2.0 TFSI Petrol Engine 06H903017T

Product currently unavailable

Part no. 059903143K

Audi A4 B7 A6 C6 Alternator Bracket Pulley Mount Holder 2.7 3.0 TDI 059903143K

Product currently unavailable

Part no. 06J903023B-1

Audi A1 8X A3 8V Q3 8U VW Golf Mk7 Alternator Generator 14V 140A 06J903023B

Product currently unavailable

Part no. 03G903016L-1

Audi A6 C6 FL CAGB Diesel Engine Alternator Generator Bosch 14V 180A 03G903016L

Product currently unavailable

Part no. 059903023BX

Audi A4 B7 2.7 TDI BPP Diesel Engine Alternator Generator 059903023BX

Product currently unavailable

Part no. 04E903023K

Audi Seat Skoda Volkswagen 1.4 TSI Petrol Alternator Generator Valeo 04E903023K

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Part no. 07K903023F

Audi RS3 8P RSQ3 8U Alternator Generator BOSH 14V 140A 07K903023F

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Part no. 03C903023B

Audi A1 8X A3 8P VW Passat B7 Alternator Generator 2.0 TDI Engine 03C903023B

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Part no. 05E903026K

Volkswagen Golf Mk8 Audi Q2 GA A3 8V 8Y 1.5 TSI Alternator 14V 140A 05E903026K

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Part no. 059903018R-1

Audi A6 C7 3.0 TDI CLAA Alternator Generator Engine Unit Hitachi 059903018R

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Part no. 059903019H

Audi A8 D4 Alternator Generator Electrical Unit 3.0 TDI Diesel Engine 059903019H

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Part no. 028903018X

Audi A3 8L Seat Ibiza Mk2 VW Polo Mk3 Alternator Generator 028903018X

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Part no. 04L903018A

Audi A4 B9 A5 F5 Q5 FY A6 C8 A7 C8 Alternator Generator Valeo 04L903018A

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Part no. 06K903026L-1

Audi S3 8Y VW Golf Mk8 R GTI Alternator Generator 2.0 TFSI 14V 140A 06K903026L

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Part no. 059903016JX

Audi A5 8T 3.0 TDI CCWA Diesel Alternator 059903016J

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Part no. 05L903026B

Audi Q2 GA 3.0 TDI DTTC Diesel Engine Alternator Generator 05L903026B

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Audi SQ5 8R 3.0 TDI CGQB Diesel Engine Alternator Generator 059903018Q

-40%

Part no. 059903018Q

Audi SQ5 8R 3.0 TDI CGQB Diesel Engine Alternator Generator 059903018Q

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Efficient alternators and generators – reliable power source for your vehicle

A wide range of alternators and generators – tailored to various car models

Alternators and generators are key components of a vehicle's electrical system, responsible for generating the electricity needed to power all vehicle systems and charge the battery. Their proper operation ensures voltage stability, the reliability of electrical devices, and driving comfort. In the Global Parts automotive store, you will find a wide selection of used car parts, including alternators and generators, perfectly matched to brands such as BMW, Audi, Mercedes, Volkswagen, Mini, and others.

Types of alternators and generators

Alternators are divided into classic and compact types. Compact alternators are smaller, lighter, and often used in modern cars where space saving and weight reduction are priorities. In contrast, generators used in heavier vehicles, such as vans or off-roaders, feature higher power output to meet greater energy demands. Typical alternator power in passenger cars ranges from 70–150 A, while in heavy-duty vehicles, it can reach 200–300 A.

Construction and purpose of alternators and generators

Alternators and generators are components mounted to the engine and usually driven by an accessory belt. Their task is to produce electrical energy while the engine is running and to maintain proper battery charging. A typical unit consists of a housing, rotor, stator, diode bridge, pulley, and electrical connector. For parts such as an Audi A3 8P alternator, it is worth comparing the OEM number, mounting type, connector, and pulley diameter.

What functions do alternators and generators perform?

Alternators and generators play a key role in the functioning of a vehicle's electrical system:

Generating electricity – They convert mechanical energy into electrical energy, which powers all vehicle systems.
Battery charging – They ensure a constant supply of current, keeping the battery fully charged.
Voltage regulation – Thanks to built-in voltage regulators, they maintain stable voltage, protecting electrical devices from damage.
Support for electrical systems – They power lighting, air conditioning, the radio, and other devices, ensuring their continuous operation.

Differences between types of alternators and generators

Component type	Typical application	What to check before purchase
Compact alternator	Modern passenger cars with limited mounting space	Bracket alignment, plug type, pulley, and OEM number
Classic alternator	Older designs and models with simpler engine accessories	Number of mounting points, regulator type, and system compatibility
High-performance generator	Vans, off-road vehicles, or versions with extensive electrical equipment	Current output, cooling method, connectors, and pulley diameter

The importance of the voltage regulator and system compatibility

A voltage regulator is a component that works with the alternator and is responsible for maintaining the correct charging level in the vehicle's electrical system. The regulator controls the rotor's operation and limits voltage fluctuations, ensuring that the battery and electrical consumers operate stably. When choosing a part like 06f 903 023c, it is good to verify the part number, compatibility with the alternator housing, and the connector type. In practice, comparing with the offer of Voltage regulators and Alternator and generator parts is also helpful.

Table – typical symptoms and alternator parameters

Symptom	Possible cause	Technical parameter
Weak battery charging	Worn voltage regulator	Operating voltage: 13.8–14.4 V
Squealing during engine operation	Damaged drive belt	Power consumption: 1.5–2.5 kW
Flickering lights	Improper voltage stabilization	Current intensity: 90–150 A (passenger cars)
No charging	Failure of the rotor or diode bridge	Power: 1.2–3.0 kW

Why is it worth taking care of alternators and generators?

Damage or malfunction of an alternator or generator can lead to problems with vehicle power supply and shorten battery life. Typical symptoms of malfunction include:

Discharged battery – May result from faulty charging.
Battery warning light on the dashboard – Signals problems with the alternator or generator.
Unusual noises – Squealing or grinding may indicate worn bearings or a drive belt.
Voltage fluctuations – May indicate problems with the voltage regulator. If replacement is necessary, at Global Parts you will find suitable used car parts that will restore the full functionality of your electrical system.

How to choose the right alternators and generators?

When choosing alternators and generators, several key aspects should be considered:

Compatibility with the vehicle model – Every electrical system has its specific technical requirements. In the Global Parts automotive store, you will find alternators and generators perfectly matched to BMW, Audi, Mercedes, Volkswagen, Mini, and others.
Technical condition – Used alternators and generators should be fully functional, free from mechanical and electrical damage.
Type and performance – Ensure that the chosen alternator or generator has the appropriate power and voltage consistent with your vehicle's requirements.

Compatibility and fitment

When choosing an alternator, it is important to match it not only to the vehicle brand but also to the specific engine version. For example, an alternator in a BMW 320d (E90) differs in parameters from an alternator in a BMW 318i (E46), even though both models belong to the 3 Series. Therefore, in parts catalogs, filtering by VIN or OEM specification is crucial. This ensures compatibility with the vehicle's electrical system and avoids installation problems.

Data needed to select the correct component

When selecting parts for a version such as the Audi A6 C6, it is worth checking the engine code, fuel type, OEM part number, and interchangeable numbers. The type of pulley, the number and layout of pins in the plug, and the method of mounting to the engine accessories also matter. In many cases, the alternator works directly with Car batteries, Cables, wiring harnesses, and connectors, and other elements of the Automotive electrical systems department.

Why choose used alternators and generators?

Used car parts, such as used alternators and generators, are an economical solution that allows for savings while maintaining high quality. By choosing used electrical system components, you gain:

Lower costs – Used alternators and generators are significantly cheaper than new ones but offer equally high quality.
Ecology – Recycling parts supports environmental protection and reduces waste.
Wide selection – In our store, you will find Alternators and generators for the most popular car brands.

How to maintain alternators and generators?

To ensure alternators and generators work 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.
Take care of the drive belt – Ensure the belt is properly tensioned and shows no signs of wear.
Cleaning and maintenance – Regularly remove dirt and check the condition of electrical connections.
Avoid overloads – Too many electrical devices connected simultaneously can overload the system. If replacement is needed, suitable parts are available to help maintain the durability and efficiency of the electrical system.

FAQ

Question	Answer
What is the construction and purpose of alternators and generators?	Alternators and generators are devices mounted to the engine, designed to generate electrical energy for the vehicle's needs. A typical unit consists of a housing, rotor, stator, diode bridge, voltage regulator, pulley, and electrical connectors. This component operates in the charging system and works with the battery and the car's onboard electrical installation.
What are alternators and generators used for?	Alternators and generators are used to power electrical consumers while the engine is running and to charge the battery. They are responsible for the stable voltage needed for the operation of lights, control units, heating, fans, and other electrical systems. When they operate incorrectly, voltage drops, starting problems, and equipment malfunctions may occur.
What role does the voltage regulator play?	The voltage regulator is a component that controls the alternator's operation and maintains the correct charging level in the electrical system. It limits excessive voltage spikes and stabilizes system operation during varying engine speeds. Depending on the design, it may be integrated with the alternator or appear as a replaceable element working with the brushes.
How to choose an alternator or generator for a specific car?	It is safest to compare the OEM part number, interchangeable numbers, fuel type, engine version, and mounting type. It is also worth checking the electrical connector, pulley diameter, and current output. If there are differences between equipment versions, verification by VIN is helpful.
What symptoms indicate problems with an alternator or generator?	Typical symptoms include a battery warning light, flickering lights, weak charging, and noise coming from the engine accessory area. In some cases, there are also problems with starting the car or unstable operation of electrical devices. During diagnostics, it is worth checking the charging voltage, belt condition, and electrical connections.
What should be checked before installing a used alternator?	Before installation, it is good to compare mounting points, the plug, the pulley, and part markings with the removed unit. You should also assess the condition of the housing, threads, connectors, and any signs of overheating. It is also important to check cooperating elements, such as the accessory belt or power cables.

Summary: alternators and generators at the Global Parts automotive store

Alternators and generators are essential components of the electrical system that ensure reliable power supply and proper operation of all vehicle systems. Global Parts offers used parts for many models and brands, including BMW, Mercedes, Audi, and others. When selecting, it is worth comparing the OEM number, connector type, mounting method, and compatibility with the engine version and car equipment. We invite you to contact us – we are here to help! For more information and interesting facts, we also invite you to visit our automotive blog.

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