What is a car electrical system?

This is a set of components responsible for powering and controlling all electrical functions in the car – from engine starting to multimedia.

What is an alternator for in a car?

The alternator generates electrical current when the engine is running and charges the battery.

What is the difference between a starter and an alternator?

The starter motor is used solely to start the engine, while the alternator is responsible for generating energy while driving.

How to check if the battery is working?

Just measure its voltage – a healthy battery should have approximately 12.6 V at rest and maintain a voltage above 10 V during cranking.

What are the most common symptoms of car electrical failure?

Problems starting the engine, flashing warning lights, power windows not working or dimming lights.

Do electrical parts from one model fit another?

Sometimes yes, but the key is to match it by VIN or OEM number – this guarantees compatibility.

How often should you check your electrical system?

It is worth performing basic diagnostics (battery, alternator) at least once a year or before a long trip.

Automotive electrical systems

At Global Parts, we offer a wide selection of original used car parts, including automotive electrical systems for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen, and others. Each of our car parts undergoes quality control to ensure you receive a top-quality product.

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Free delivery - Mon, Nov 24

If paid before 14:00

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Audi A4 B8 2.0 TDI CNHC Diesel Alternator Generator 04L903017A

PLN 256.95

Free delivery - Mon, Nov 24

If paid before 14:00

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VW Volkswagen Golf Mk7 Wiring Loom PDC Rear Harness Parking Sensor 5G0971104L

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

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Volkswagen Polo Mk5 V 6R Battery Cable Alternator Starter 6R0971349AM

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

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Volkswagen Polo 6R Mk5 Engine Wiring Loom Harness Cable 03E971612AE

PLN 569.95

Free delivery - Mon, Nov 24

If paid before 14:00

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VW Volkswagen Scirocco Mk3 Air Module Control Unit ECU 1K0909605AE

PLN 42.95

Delivery - Mon, Nov 24

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PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

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Volkswagen Golf Scirocco CC Multimedia Interface Module Box 5N0035341G

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

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VW Polo Mk6 AW Headlight Head Lamp Range Control Unit Module ECU 2G0907357A

PLN 189.95

Free delivery - Mon, Nov 24

If paid before 14:00

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Volkswagen Touareg 7L Front Impact Crash Sensor Right Left N/O/S 7L0909606C

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

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Volkswagen Passat B7 Headlight Cornering Module Control Unit 3D0941329B

PLN 189.95

Free delivery - Mon, Nov 24

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Volkswagen Touareg 7L Positive Cable Battery Point Box Jump Unit 7L0937401

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. 5G0971104D

VW Volkswagen Golf Mk7 Wiring Loom PDC Rear Harness Parking Sensor 5G0971104D

PLN 42.95

Delivery - Mon, Nov 24

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Volkswagen Touareg 7L Fuse Box Relay Control Unit Module 7L0937503

PLN 189.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 2G0971104C

Volkswagen Polo Mk6 PDC Sensor Wiring Loom Harness Cable Rear Bumper 2G0971104C

PLN 180.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 5G0035222A

Volkswagen Golf Mk7 Media In Port Socket Connection Adapter 5G0035222A 5Q0035736

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. 2Q0971537AN

Volkswagen Polo Mk6 AW Battery Negative Cable Wiring Earth Line 2Q0971537AN

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 1K0971349BP

Volkswagen Golf Mk6 Alternator Main Cable Wiring Harness Loom 1K0971349BP

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 1K0971349AQ

Volkswagen VW Golf Mk6 Alternator Cable Wiring Harness Loom 1K0971349AQ

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 3C0937125A-1

VW Volkswagen Tiguan 5N Passat B7 Engine Bay Fuse Relay Box Terminal 3C0937125A

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. 7N0959794K

VW Sharan 7N Rear Door Module Control Unit Left N/S Passenger Side 7N0959794K

PLN 85.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7N0843638

Volkswagen Sharan 7N Sliding Door Catch Upper Locking Plate Right O/S 7N0843638

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 03E971612AC

VW Volkswagen Polo 6R Engine Wiring Harness Cable Loom 1.2 CGPA Petrol 03F971612

PLN 379.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 1K8971104S

Volkswagen Scirocco Mk3 Rear Number Plate Wiring Harness Cable Loom 1K8971104S

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 5G0971095A

VW Volkswagen Golf Mk7 Wiring Loom PDC Front Harness Parking Sensor 5G0971095A

PLN 237.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 3C0907376A

Volkswagen VW Golf Scirocco Mk3 Electric Damping Control Module 3C0907376A

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 1K0971391ES

VW Golf Mk5 Seat Well Cable Front Left N/S Wiring Loom Harness 1K0971391ES

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. 5N0971349AT

Volkswagen Tiguan 5N Alternator Generator Wiring Harness Cable 5N0971349AT

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 05E903026B

Volkswagen Golf Mk7 Audi A3 8V Alternator 14V 140A 1.5 TSI 05E903026B

PLN 246.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P6907357B

Volkswagen Golf Mk7 Headlight Head Lamp Range Control Unit Module ECU 7P6907357D

PLN 189.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 06J906026AR

Volkswagen Scirocco Mk3 2.0 TFSI CAWB 200HP Control ECU Kit 06J906026AR Manual

PLN 1,234.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 04B903023B

Volkswagen Polo Mk5 Alternator Generator 140A Diesel Engine 04B903023D

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 03C906027AR

VW Polo 6R V GTI 1.4 TSI CAVE 180HP Engine Control ECU Kit 03C906027AR Automatic

PLN 854.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P6971121H

VW Volkswagen Touareg 7P Door Wiring Loom Harness Front Left N/S 7P6971121C

PLN 123.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P6971161FL

VW Touareg 7P Door Wiring Loom Harness Cable Front Passenger Side 7P6971161ES

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P6971162EC

VW Touareg 7P Door Wiring Loom Harness Cable Front Driver's Side 7P6971162DJ

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 4H0959793F

VW Touareg 7P Front Door Control Module Unit ECU Driver's Side 4H0959793F

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 4H0959792F

VW Touareg 7P Front Door Control Module Unit ECU Passenger Side 4H0959792F

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P6971693A

Volkswagen Touareg 7P Door Harness Wiring Loom Rear Left Right N/O/S 7P6971693A

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P6919603

VW Volkswagen Touareg 7P Dashboard Multimedia Display Screen Panel 7P6919603

PLN 664.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P6907530C

VW Volkswagen Touareg 7P MK2 Gateway Control Unit Module ECU 7P6907530C

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P6035670B

VW Volkswagen Touareg 7P CD Radio Stereo Head Unit Panel 7P6035670B

PLN 1,519.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P0937401

Volkswagen Touareg 7P Power Distribution Unit Positive Battery Socket 7P0937401

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P0907311-1

Volkswagen Touareg 7P 3.0 TDI CASD 204HP Engine Unit ECU Set 7P0907311 Automatic

PLN 2,944.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P6919475

Volkswagen Touareg 7P PDC Parking Distance Control Module 7P6919475

PLN 123.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 6R0971349AP

VW Volkswagen Polo 6R 1.4 TSI Petrol Alternator Wiring Harness Loom 6R0971349AP

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 06K907425B-13

Volkswagen Golf VII R 2.0TSI CJXC 300HP Engine Control ECU Kit 06K907425B Manual

PLN 1,139.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 1K0035507L

VW Volkswagen Scirocco Mk3 Roof Top Antenne Control Unit Module 1K0035507L

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. 04L907309G-1

Volkswagen New Beetle 2.0 TDI CUUA 110HP Engine Unit ECU Kit 04L907309G Manual

PLN 949.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 6R0959655M

VW Volkswagen Polo 6R Seat Ibiza 6J Air Module Control Unit ECU 6R0959655M

PLN 161.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 7P0959655B

Volkswagen Touareg 7P Air Module ECU Control Module Unit 7P0959655B

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 5N0035342E

VW Volskwagen Polo 6R Multimedia Electronic Control Interface Module 5N0035342E

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 8P0959433

Audi A3 8P Body Control Comfort Unit Module BCM Convenience Unit 8P0959433

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Battery Cable Volkswagen VW Golf Mk6 VI Positive Plus Pole Lead 3C0971228K

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VW Polo Petrol Engine Control ECU Manual Siemens 5WP1630440 03E906033

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Volkswagen Crafter 30-35 2E Amarok 2.0 TDI Engine Starter Motor 2H0911023F

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Key components of vehicle electrical systems

Original electrical parts for popular car brands

A car's electrical system is a complex system responsible for many key functions—from engine starting to lighting and on-board electronics. Modern cars are equipped with increasingly advanced electrical solutions that not only improve driving comfort but also enhance safety. At the Global Parts automotive store you will find a wide range of used car parts , such as alternators, starters, batteries, control modules and other automotive electrical systems that perfectly fit BMW , Audi , Mercedes , Volkswagen , Mini and many others.

How does a car's electrical system work?

A car's electrical system is a complex system that consists of several key components that work together to ensure the vehicle's reliable operation:

Battery accessories – Includes clamps, cables, holders and other components necessary for battery installation and maintenance.

Electronic control modules and controllers – They control and manage the operation of various vehicle systems, such as the engine, air conditioning and ABS.
Alternators and generators – Responsible for generating electricity and charging the battery while the engine is running.
Parts for alternators and generators – Including voltage regulators, brushes and bearings that ensure proper operation of the alternator.
Starters – Key components of the starting system that enable the engine to be started.
Starter parts – Including bendixes, rotors and solenoids necessary for the proper operation of the starter.
Batteries – They store the electrical energy necessary to start the engine and power on-board systems.
Wires, harnesses and connectors – They transmit energy and electrical signals between various vehicle systems.
Fuses and fuse boxes – Protect the electrical system against overloads and short circuits.
Relays – They control the flow of current in individual electrical circuits of the vehicle. A functioning electrical system is the basis for the reliability of your car, regardless of operating conditions.

Key technical parameters of electrical systems

Each of these components has specific technical parameters that determine its compatibility with the vehicle. For example, alternators installed in mid-range cars (e.g., Volkswagen Passat B6) typically have a capacity of 90 A to 140 A, while luxury vehicles (e.g., Mercedes S-Class) require alternators with a capacity exceeding 180 A. Starter motors vary in torque and operating voltage – the standard is 12 V, while 24 V starters are used in heavy-duty vehicles.

Why is it worth taking care of your car's electrical system?

Regular maintenance and replacement of electrical system components is key to reliability and road safety. Faulty components can lead to:

Problems starting the engine.
Failure of safety systems such as ABS or airbags.
Decreased efficiency of on-board equipment, e.g. lighting or air conditioning. At the Global Parts store we offer original used car parts , which have undergone detailed quality tests, ensuring their full functionality.

Symptoms of electrical system disruptions

In practice, electrical faults manifest themselves in a variety of ways. Drivers most often notice: dimming lights when parked, difficulty starting the engine, a voltage drop on the on-board computer, or air conditioning malfunctions. The table below presents typical correlations:

Symptom	Possible cause	Item to check
Difficulty starting the engine	Worn out starter or battery	Starter motor, battery
Dimming the lights	Inefficient alternator	Alternator, voltage regulator
Electric windows not working	Damaged relays or harness	Relays, wires

How to choose the right parts for your electrical system?

When choosing parts for the electrical system, such as alternators, starters or control modules, it is worth paying attention to:

Vehicle-specific fit – Every car make and model requires specific specifications. At Global Parts, you'll find parts that perfectly fit BMW , Audi , Mercedes , Volkswagen , Mini, and many more .
Technical condition – All used parts we offer are thoroughly checked to ensure their reliability.
Technical parameters – For example, alternators should have appropriate current output, adapted to the needs of your vehicle.

Compatibility and fit

The selection of electrical parts is based primarily on OEM part numbers, but matching them to specific parameters is equally important, including current, voltage, and the number of connector pins. For example, the 120A alternator used in the Audi A4 B7 differs significantly from the 150A version installed in the Audi A6 C6 . Therefore, using manufacturer catalogs or providing the VIN makes finding the right component much easier.

Why choose used electrical parts?

Purchase of used car parts This solution allows you to combine savings with quality. Why choose it?

Lower costs – Used alternators, starters and other parts are cheaper than new ones, but offer the same high quality.
Ecology – You support recycling and reduce waste by choosing used car parts .
Wide range – We offer electrical parts for the most popular car brands, so you can easily find what you need.

How to take care of your car's electrical system?

To ensure your electrical system operates reliably for years, it is worth remembering a few rules:

Regularly check the battery condition and charge level.
Take care of your cables and connectors – corrosion or damage can lead to voltage drops and failures.
Monitor the operation of the alternator and starter – early detection of problems will help avoid more serious breakdowns. If you have any problems, you will find the right car parts at Global Parts that will help restore your vehicle to full working order.

Step-by-step control procedures

Measure the battery voltage with a multimeter – the resting value should be approximately 12.6 V.
Check the charging voltage with the engine running – the correct range is 13.8–14.5 V.
Assess the condition of the wires and terminals – lack of corrosion and a firm seat are essential.
If in doubt, check the quiescent current consumption – it should not exceed 0.05–0.08 A.

FAQ - Frequently asked questions about electrical systems in cars

Question	Answer
What is a car electrical system?	This is a set of components responsible for powering and controlling all electrical functions in the car – from engine starting to multimedia.
What is an alternator for in a car?	The alternator generates electrical current when the engine is running and charges the battery.
What is the difference between a starter and an alternator?	The starter motor is used solely to start the engine, while the alternator is responsible for generating energy while driving.
How to check if the battery is working?	Just measure its voltage – a healthy battery should have approximately 12.6 V at rest and maintain a voltage above 10 V during cranking.
What are the most common symptoms of car electrical failure?	Problems starting the engine, flashing warning lights, power windows not working or dimming lights.
Do electrical parts from one model fit another?	Sometimes yes, but the key is to match it by VIN or OEM number – this guarantees compatibility.
How often should you check your electrical system?	It is worth performing basic diagnostics (battery, alternator) at least once a year or before a long trip.

Summary: Automotive electrical systems at Global Parts Automotive Store

Automotive electrical systems are the foundation of the reliability and comfort of every modern vehicle. By choosing the right parts, such as alternators, batteries, and control modules, you can ensure your car's full operational efficiency. The Global Parts automotive store invites you to browse our wide selection of original 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 .

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