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.

More information

Make

Category

Subcategory

Condition

In Stock

Price

Products in promotion

Part no. 8P0035535

Audi A4 B7 Amplifier Bracket Aerial Antenna Module Mount Holder 8P0035535

Product currently unavailable

Part no. 1K0937124Q

Audi RS3 8P Engine Bay SAM Relay Fuse Box Module Control Unit ECU 1K0937124Q

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. 06H911021A

Audi A5 8T 2.0 TFSI Petrol Engine Starter Motor Actuator 06H911021A

Product currently unavailable

Part no. 4E0955559C-1

Audi A6 C6 Front Windscreen Rain Light Solar Sensor Unit 4E0955559C

Product currently unavailable

Part no. 8T0959760E

Audi A5 8T Front Seat Control Module Unit Left Right N/O/S 8T0959760E

Product currently unavailable

Part no. 8L0959655L

Audi A3 S3 8L Front Crash Impact Air Module Sensor Unit Module 8L0959655L

Product currently unavailable

Part no. 8T2035195

Audi A4 B8 Head Unit Radio CD Player Symphony Stereo Audio Player 8T2035195

Product currently unavailable

Part no. 02Z911023L

Audi R8 Gen 1 Engine Starter Motor 4.2 FSI 02Z911023L

Product currently unavailable

Part no. 059911021C

Audi A4 B8 3.0 TDI CAPA Diesel Starter Motor 059911021C

Product currently unavailable

Part no. 09D927750KC

Audi Q7 4L 3.0 TDI CASA Automatic Gearbox Control Module Unit ECU 09D927750KC

Product currently unavailable

Part no. 8K0959760D

Audi A5 8T Front Driver Site Module Control Unit Seat Adjustment Seat 8K0959760D

Product currently unavailable

Part no. 4K5962239

Audi A6 C8 Tailgate Opening Steering Line D Pulse Generator Flap 4K5962239

Product currently unavailable

Part no. 8K0907063AG

Audi A4 B8 Onboard Supply Control Unit Comfort 8K0907063AG

Product currently unavailable

Part no. 4H0959795E

Audi A8 4H Rear Door Module Control Unit Left Right N/O/S 4H0959795E

Product currently unavailable

Part no. 0AM911023G

Audi A3 8V Engine Starter Motor Actuator Starter 0AM911023G

Product currently unavailable

Part no. 059903023BX

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

Product currently unavailable

Part no. 04L907309L

Audi A4 B9 2.0 TDI DETA Quattro Engine Control Unit ECU 04L907309L Automatic

Product currently unavailable

Part no. 04E903023K

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

Product currently unavailable

Part no. 8R0971228BG

Audi SQ5 8R Starter Alternator Engine Wiring Loom Cable 3.0 TDI 8R0971228BG

Product currently unavailable

Part no. 8Y0971365N

Audi A3 8Y Seat Belt Warning System Wiring Harness Cable Loom System 8Y0971365N

Product currently unavailable

Part no. 8J0057186JX

Audi TT 8J Radio Head Unit CD Audio Player Control Unit 8J0035186J

Product currently unavailable

Part no. 03L906022BQ-1

Audi A3 8P 2.0 TDI CBAB 140HP Engine ECU Kit Ignition + Key 03L906022BQ Manual

Product currently unavailable

Part no. 8X0971036BS

Audi A1 8X Door Card Wiring Harness Loom Cable Front Passenger Side 8X0971036BS

Product currently unavailable

Part no. 03L906022DH

Audi TT 8J 2.0 TDI 170HP CBBB Quattro Engine Module Unit ECU 03L906022DH Manual

Product currently unavailable

Part no. 05E903026K

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

Product currently unavailable

Part no. 4L0035225

Audi Q7 4L Radio Aerial Antenna Amplifier AM/FM 4L0035225

Product currently unavailable

Part no. 8Y4971104BK

Audi S3 8Y Rear Bumper Wiring Harness Cable Loom 8Y4971104BK

Product currently unavailable

Part no. 4L0910110B

Audi Q7 4L CD Player Changer Multimedia Module Control Unit 4L0910110B

Product currently unavailable

Part no. 4F0907279B

Audi A6 C6 Body Control Comfort Unit Module BCM Convenience Unit 4F0907279B

Product currently unavailable

Part no. 6C0937132C

Audi A1 S1 8X Fuse Box Relay Top Upper Cover Cap Flap 6C0937132C

Product currently unavailable

Part no. 8W0959595N

Audi A4 B9 Door Module Rear Right Left N/O/S Control Unit 8W0959595N

Product currently unavailable

Part no. 8W0906093F

A4 B9 35 TFSI Fuel Pump Sender Control Relay Module Unit ECU 8W0906093F

Product currently unavailable

Part no. 05L903141

Audi A3 8Y A4 B9 A6 C8 Alternator Bracket Mount Holder 2.0 TDI 05L903143

Product currently unavailable

Part no. 8W0907064GB

Audi A4 B9 A5 F5 Central Body Control Module BCM Unit ECU 8W0907064GB

Product currently unavailable

Part no. 8P0907404-1

Audi RS3 8P 2.5 TFSI CEPA Quattro 340HP Engine Unit ECU Kit 8P0907404 Automatic

Product currently unavailable

Part no. 8E0057185KX

Audi A4 B7 Radio Media Player Audio CD Head Unit Player Concert 8E0057185KX

Product currently unavailable

Part no. 8T2035186P-1

Audi A4 B8 Radio Media Player Audio CD Head Unit Player Concert 8T2035186P

Product currently unavailable

Part no. 4G0907401F-1

Audi A7 4G 3.0 TDI CDUC Quattro Engine ECU Kit BCM + Ignition + Key 04L907445F

Product currently unavailable

Part no. 4G8971085DP

AUDI A6 C7 A7 FY Sensor Harness Installation PDC Radar 4G8971085DP

Product currently unavailable

Part no. 4G0035061H

Audi A5 8T Head Unit Radio Player Navigation Control Module 4G0035061H

Product currently unavailable

Part no. 4G0907553F-1

Audi RS6 C7 4G Air Suspension Module Regulation Control Unit WABCO 4G0907553F

Product currently unavailable

Part no. 8P4963553

Audi A3 8P Front Seat Occupation Sensor Left Right N/O/S 8P4963553

Product currently unavailable

Part no. 4H0907063BN

Audi A6 C7 2.0 TDI CGLC BCM Body Control Module Unit ECU 4H0907063BN

Product currently unavailable

Part no. 8K2907115Q-1

Audi A5 8T 2.0 TFSI CDNB 180HP Engine ECU Kit 8K2907115Q 2 Keys + Ignition

Product currently unavailable

Part no. 8E0907637

Audi A4 B7 YAW Sensor ESP Rotation Rate Acceleration Control Unit 8E0907637

Product currently unavailable

Part no. 4N0915105E

Audi A6 C8 Q7 Q8 4M Hybrid Lithium Voltage Battery Unit 4N0915105E

Product currently unavailable

Part no. 8X0919475Q

Audi Q3 8U PDC Parking Distance Assistant Control Unit Module ECU 8X0919475Q

Product currently unavailable

Part no. 431951253G

Audi S8 A8 D3 Relay Control Module Unit Purple 381 4 Pins 431951253G

Product currently unavailable

Part no. 05L911021

Audi A4 B9 A5 F5 2.0 Diesel Starter Motor Engine Valeo 05L911021 0001174006

Product currently unavailable

Part no. 355013 ampassy 5631b6

Audi A4 B7 Audio Sound System Amplifier Bose 355013 5631B6

Product currently unavailable

Part no. 0AH911023G

Audi Seat Skoda Volkswagen 1.2 TSI Petrol Starter Motor 0AH911023G

Product currently unavailable

Part no. 4L0907468

Audi A6 C6 Q7 4L Gateway Module Control Unit 4L0907468 4L0910468

Product currently unavailable

Part no. 4K0907334

Audi A6 C8 A7 C8 Fuse Box Power Distribution Unit Module Control 4K0907334

Product currently unavailable

Part no. 057911023E

Audi Q7 4L 4.2 TDI Quattro Engine Starter Motor Actuator 057911023E

Product currently unavailable

Part no. 02E911023H

Audi A3 Starter Motor Engine Diesel 02E911023H

Product currently unavailable

Part no. 4F9971085E

Audi A6 C6 Avant Rear Bumper PDC Wiring Loom Parking Sensor 4F9971085E

Product currently unavailable

Part no. 4G5971693

Audi A6 C7 4G Rear Door Card Harness Loom Cable Wiring Left N/S 4G5971693

Product currently unavailable

Part no. 04L907309A-1

Audi A3 8V 2.0 TDI CRLB 150HP Engine ECU Kit Ignition + 2 Keys 04L907309A Manual

Product currently unavailable

Part no. 8V4971029M

Audi A3 S3 8V Front Door Wiring Harness Loom Cable Driver Side 8V4971029M

Product currently unavailable

Part no. 5WA907530Q

Audi A3 RS3 8Y Gateway Control Unit Module ECU GW2020 High 5WA907530Q

Product currently unavailable

Part no. 4K5971693AJ

Audi A6 C8 Door Wiring Harness Loom Rear Left Right N/O/S 4K5971693AJ

Product currently unavailable

Part no. 06K907425C-1

Audi Q3 8U 2.0 TFSI CULB 180HP Quattro Engine ECU Kit 06K907425C Ignition + Key

Product currently unavailable

Part no. 059903018R-1

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

Product currently unavailable

Part no. 03L911024

Audi A4 B8 A5 8T Diesel 2.0 TDI Starter Motor Manual 03L911024

Product currently unavailable

Part no. 4E0919063

Audi A1 8X A3 8V Door Light Emitting Diode Mount Bracket LED Module 4E0919063

Product currently unavailable

Part no. 059903019H

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

Product currently unavailable

Part no. 02M911022F

Audi Q2 GA 35 TFSI DXDB Petrol Starter Motor Manual 02M911022F

Product currently unavailable

Part no. 06L907425C-1

Audi Q5 FY 2.0 TFSI DAXB 252HP Quattro Engine ECU Kit Gateway + Key 06L907425C

Product currently unavailable

Part no. 5WA980653C

Audi A3 S3 RS3 8Y Front Camera FAS Lane Assistance Control Unit 5WA980653C

Product currently unavailable

Part no. 8K0971765E

Audi A4 B8 AdBlue Tank Wiring Harness Loom Cable 8K0971765E

Product currently unavailable

Part no. 03L906022JM-1

Audi A4 B8 2.0 TDI 143HP CAGA Diesel Engine Control Unit ECU Kit 03L906022JM

Product currently unavailable

Part no. 4H0971224BA

Audi A8 D4 Alternator Starter Motor Wiring Harness Cable Loom 4H0971224BA

Product currently unavailable

Part no. 8P4971687S

Audi A3 8P Door Loom Harness Wiring Passenger Rear Left N/S 8P4971687S

Product currently unavailable

Part no. 8D0907539

Audi A3 8L A4 B5 Windscreen Sunlight Sun Light Solar Sensor Unit 8D0907539

Product currently unavailable

Part no. 8K0907064HE

Audi A4 B8 Body Control Module BCM Comfort Control Unit 8K0907064DP

Product currently unavailable

Part no. 8K0907144E

Audi A5 8T Dynamic Active Steering Module ECU 8K0907144E

Product currently unavailable

Part no. 8K0906264C

Audi A5 8T 1.8 TFSI CJEE 177HP Engine ECU Kit Ignition Key 8K0906264C Automatic

Product currently unavailable

Part no. RHD-4G8919604L-1

Audi A7 4G Head Up Display Screen Projector Dashboard Car System HUD 4G8919604L

Product currently unavailable

Part no. 4F0907553A

Audi A6 C6 Allroad Adaptive Suspension Module Software Control Unit 4F0907553A

Product currently unavailable

Part no. 8W0419065D

Audi A4 B9 A5 F5 Power Steering Column Control Unit Module 8W0419065D

Product currently unavailable

Part no. 8K5945094AA-1

Audi A4 B8 Saloon Trunk Lid Tail Light Lamp Wiring Rear Right O/S 8K5945094AA

Product currently unavailable

Part no. 4H0971224

Audi A8 D4 Battery Starter Alternator Harness Wiring Cable 4H0971224

Product currently unavailable

Part no. 04L903018A

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

Product currently unavailable

Part no. 06H911024B

Audi A5 8T 2.0 CNCD Petrol Starter Motor 06H911024B

Product currently unavailable

Part no. 4G0035056-1

Audi A4 B8 Sat Nav Multimedia DAB Radio Control Head Unit 4G0035056

Product currently unavailable

Part no. 04L907309AB-3

Audi Q3 8U 2.0 TDI DFTA 150HP Quattro Engine ECU Kit 04L907309AB Ignition + Key

Product currently unavailable

Part no. 5WA959651

Audi A3 8Y VW Golf Mk8 Air Module Crash Impact Sensor 5WA959651

Product currently unavailable

Part no. 06L911021A

Audi A4 B9 2.0 TFSI CVKB Petrol Engine Starter Motor 06L911021A

Product currently unavailable

Part no. 420941824

Audi R8 42 Spyder Fuse Box Battery Terminal Cover Housing Clamp 420941824

Product currently unavailable

Part no. 8N0906018CN

Audi TT 8N 1.8T AUQ 180HP Petrol Engine Control Unit ECU 8N0906018CN Automatic

Product currently unavailable

Part no. 8W0907159D

Audi RS4 B9 A5 F5 Impact Sound Module Control Unit 8W0907159D

Product currently unavailable

Part no. 4N0959655AJ

Audi A6 C8 Air Module Control Unit ECU Crash Control Computer 4N0959655AJ

Product currently unavailable

Part no. 8K0971589G

Audi S5 8T Steering Wheel Harness Wiring Loom Cable 8K0971589G

Product currently unavailable

Part no. 059903016JX

Audi A5 8T 3.0 TDI CCWA Diesel Alternator 059903016J

Product currently unavailable

Part no. 8P0907115AP-1

Audi S3 8P 2.0 TFSI CDLA 265HP Engine ECU Kit Ignition + Key 8P0907115AP Manual

Product currently unavailable

Part no. 8P0959655N

Audi A3 8P Side Air Module Control Unit ECU 8P0959655N

Product currently unavailable

Part no. 4K0035710

Audi A6 C8 Front A Pillar Column Dashboard Speaker Right O/S 4K0035710

Product currently unavailable

Part no. 8K0971228B

Audi A5 8T Battery Starter Alternator Harness Wiring Cable 8K0971228B

Product currently unavailable

...

Showing 2575-2673 of 2723 products

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 .

used parts volkswagen car parts mercedes used car parts cheap car parts audi auto parts spare parts genuine used audi parts bmw starters, alternators, ecus & wiring mercedes starters, alternators, ecus & wiring mini starters, alternators, ecus & wiring audi starters, alternators, ecus & wiring volkswagen starters, alternators, ecus & wiring