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. 4L0907468A

Audi Q7 4L Gateway Module Central Control Unit 4L0907468A

Product currently unavailable

Part no. 4H0919475Q

Audi A6 C7 PDC Parking Distance Sensor Module Control Unit ECU 4H0919475Q

Product currently unavailable

Part no. 4F0971589A

Audi S6 C6 Steering Wheel Multifunction Wiring Loom 4F0971589A

Product currently unavailable

Part no. 4E0919887L

Audi Q7 4L Sat Navi Navigation Drive Reader DVD Player Unit 4E0919887L

Product currently unavailable

Part no. 1K0971349FL

Audi A3 8P Alternator Main Cable Wiring Harness Loom 1K0971349FL

Product currently unavailable

Part no. 04L903017A

Audi A4 B8 2.0 TDI CNHC Diesel Alternator Generator 04L903017A

Product currently unavailable

Part no. 8U1035192A

Audi Q3 8U Sat Navi Stereo Radio Audio Head Unit CD Player 8U1035192A

Product currently unavailable

Part no. 4G0035192H

Audi A6 C7 Multimedia Radio CD Player Head Unit 4G0035192H

Product currently unavailable

Part no. 5Q0906121D

Audi Q3 8U 2.0 TDI CFGC Fuel Sender Pump Control Module Unit ECU 5Q0906121D

Product currently unavailable

Part no. 4F0907539

Audi S6 C6 Dashboard Light Sun Solar Sensor Unit 4F0907539

Product currently unavailable

Part no. 1K0937125D

Audi A3 8P Engine Bay Fuse Box 1K0937125D

Product currently unavailable

Part no. 8K0907801C

Audi A5 8T Parking Brake Handbrake Module Control Unit 8K0907801C

Product currently unavailable

Part no. 8K0955557B

Audi A5 8T Crash Impact Sensor Unit Module Air Unit 8K0955557B

Product currently unavailable

Part no. RHD-8R2035666F

Audi A4 B8 Multimedia Stereo Sat Nav SD CD Player Radio Head Unit 8R2035666F

Product currently unavailable

Part no. 4K4907117L

Audi Q7 4M Camera Module Drive Support Lane Assist Control Unit 4K4907117L

Product currently unavailable

Part no. 03F906070GN-1

Audi A1 8X 1.2 TFSI CBZA 86HP Engine ECU Kit Ignition + Key 03F906070GN Manual

Product currently unavailable

Part no. 81A035192D

Audi A3 8V Radio CD SD SIM Player Stereo Sat Nav Head Unit 81A035192D

Product currently unavailable

Part no. 7P0915105

Audi Volkswagen Varta Car Battery Accumulator AGM 12V 68Ah 680A 7P0915105

Product currently unavailable

Part no. 8P4971029M

Audi A3 8P Door Wiring Loom Front Left N/S Harness 8P4971029M

Product currently unavailable

Part no. 8P0953549B

Audi A3 8P Steering Wheel Position Angle Sensor Control Unit Module 8P0953549B

Product currently unavailable

Part no. 4G8959793A

AUDI A7 4G8 Door Control Module Front Left N/S Driver Side 4G8959793A

Product currently unavailable

Part no. 059911024G

Audi A6 C6 ASB 3.0 TDI V6 Starter Motor 059911024G

Product currently unavailable

Part no. 8P0907279C

Audi A3 8P Body Control Comfort Unit Module BCM Unit 8P0907279C

Product currently unavailable

Part no. 057911023EX

Audi Q7 4L Engine Starter Motor Actuator Starter 057911023EX

Product currently unavailable

Part no. 6C0941824D

Audi A1 S1 8X Fuse Relay Box Module Unit 6C0941824D

Product currently unavailable

Part no. 4L0910553H

Audi Q7 4L Air Suspension Module Regulation Control Unit 4L0910553H

Product currently unavailable

Part no. 8W0907064GC

Audi A5 F5 Central Body Control Module BCM Unit ECU 8W0907064GC

Product currently unavailable

Part no. 4G0906093H

Audi A7 4G 3.0 TDI Fuel Pump Sender Control Relay Module Unit ECU 4G0906093H

Product currently unavailable

Part no. 8T0959795J

Audi A5 8T Rear Door Module Control Unit Module ECU Left Right N/O/S 8T0959795J

Product currently unavailable

Part no. 8W0959121A

Audi A4 B9 A5 F5 Air Module Pedestrian Protection Sensor Crash 8W0959121A

Product currently unavailable

Part no. 8H0959433K

Audi A4 B7 Cabrio Body Comfort Central Control Unit Module BCM ECU 8H0959433K

Product currently unavailable

Part no. 80A971104A

Audi Q2 GA Rear Bumper PDC Parking Sensor Wiring Harness Loom Cable 80A971104A

Product currently unavailable

Part no. 8U0959651

Audi Q3 8U Air Module Crash Impact Sensor Control Unit 8U0959651

Product currently unavailable

Part no. 83A919605C

Audi RSQ3 F3 Onboard MMI Multimedia Sat Nav Display Touch Screen 83A919605C

Product currently unavailable

Part no. 4F1910552C-1

Audi S6 C6 5.2 FSI Quattro BXA 435 HP Control Unit ECU Kit 4F1910552C Automatic

Product currently unavailable

Part no. 8K0971104AE

Audi A5 8T Rear Bumper PDC Parking Sensor Wiring Harness Loom 8K0971104AE

Product currently unavailable

Part no. 4M0907355

Audi A4 B9 Q7 4M A5 F5 Adblue Control Module Unit 4M0907355

Product currently unavailable

Part no. 4E0616575K

Audi S8 A8 D3 4E Air Shock Absorber Sensor Damper Front Left N/S 4E0616575K

Product currently unavailable

Part no. 8T2035666D

Audi A5 8T CD Player Radio Multimedia MMI Head Unit ECU 8T2035666D

Product currently unavailable

Part no. 8T0907441B

Audi S5 8T Rear Reversing Camera Module View Camera Control Unit ECU 8T0907441B

Product currently unavailable

Part no. 8U0971104E

Audi Q3 8U Rear Bumper PDC Parking Sensor Wiring Harness Loom Cable 8U0971104E

Product currently unavailable

Part no. 4F1971030BD

Audi A6 C6 Front Right O/S Door Harness Cable Loom 4F1971030BD

Product currently unavailable

Part no. 8K0907064GE

Audi A5 S5 8T BCM Body Control Module Unit ECU 8K0907064GE

Product currently unavailable

Part no. 8K0907064BP

Audi S5 8T Body Comfort Control BCM Supply Module Unit ECU 8K0907064BP

Product currently unavailable

Part no. RHD-8E2907355C

Audi A4 S4 B6 B7 8E Module Controller Box Housing Cover Panel 8E2907355C

Product currently unavailable

Part no. 06D903016AB

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

Product currently unavailable

Part no. 4F0035061

Audi A5 8T Radio Stereo Head Unit Control Switch Unit Audio Controller 4F0035061

Product currently unavailable

Part no. 8K0907063DC

Audi A5 8T Body Control Comfort Unit Module BCM Unit ECU 8K0907063DC

Product currently unavailable

Part no. 8J0907115Q

Audi TTS 8J 2.0 TFSI CDLB 272HP Quattro Engine Control ECU 8J0907115Q Automatic

Product currently unavailable

Part no. 03L903017E-1

Audi A4 B8 Avant 2.0 TDI Quattro Alternator Generator 03L903017

Product currently unavailable

Part no. 4F0919129D

Audi A5 8T Volkswagen Touareg TV Tuner Digital Video Control Module 4F0919129D

Product currently unavailable

Part no. 8K0907801L

Audi S5 8T Parking Electric Brake Handbrake Module Control Unit 8K0907801L

Product currently unavailable

Part no. 8K0919475G

Audi A5 S5 8T PDC Parking Distance Assist Sensor Module Control Unit 8K0919475G

Product currently unavailable

Part no. 4G0907397R

Audi S1 8X Front Lamp Headlight DRL Ballast Control Module Unit 4G0907397R

Product currently unavailable

Part no. 4G0907637K

Audi A7 4G8 ESP Yaw Rate Module Control Unit Sensor ECU 4G0907637K

Product currently unavailable

Part no. 8W6971104A

Audi A5 F5 Rear Bumper PDC Parking Sensor Wiring Harness Loom Cable 8W6971104A

Product currently unavailable

Part no. 5Q0959655AR

Audi A3 8V Air Module Control Unit SRS System ECU 5Q0959655AR

Product currently unavailable

Part no. 8K0907063DD

Audi A5 8T Onboard Comfort Supply BCM Control Module Unit ECU 8K0907063DD

Product currently unavailable

Part no. 5Q0959392B

Audi A3 S3 8V Door Control Module Front Passenger Side Left N/S 5Q0959392B

Product currently unavailable

Part no. 8J0035193D

Audi TT 8J Centre Console Multimedia Navigation Control CD Player 8J0035193D

Product currently unavailable

Part no. 8J0035223E

Audi TT 8J Coupe Roadster Ultrasonic Sound Control Module ECU Unit 8J0035223E

Product currently unavailable

Part no. 03G906016DT

Audi A3 8P 2.0 TDI 140HP Diesel Engine Control Unit ECU Module DSG 03G906016DT

Product currently unavailable

Part no. 4F0907279

Audi A6 C6 Power Supply Module Comfort Control Unit ECU 7591534

Product currently unavailable

Part no. 4H0906093D

Fuel Pump Audi A8 D4 Q7 4L Diesel Control Unit Module 4H0906093D

Product currently unavailable

Part no. RHD-8T2820043AD

Air Condition Control Audi A4 B8 A5 8T Climate Module Heater Unit 8T2820043AD

Product currently unavailable

Part no. 8E0837220Q-1

Remote Key Audi A4 S4 B7 8E Radio Alarm Key Fob Opener Button 8E0837220Q

Product currently unavailable

Part no. 4H0971104S

Audi A8 D4 Rear Bumper PDC Parking Sensor Wiring Harness Loom Cable 4H0971104S

Product currently unavailable

Part no. 4G8959792H

Audi A7 4G8 Door Control Module Passenger Side Front 4G8959792H

Product currently unavailable

Part no. 4L0035382B

Audi Q7 4L Boot Trunk Subwoofer Rear Bass Speaker 4L0035382B

Product currently unavailable

Part no. 8P4971687R

Audi A3 8P Door Harness Loom Cable Wiring Rear Right O/S 8E0971687L

Product currently unavailable

Part no. 4H0907348C

Audi A8 D4 4H Relay Fuse Bracket Holder Junction Box 4H0907348C

Product currently unavailable

Part no. 5Q0907530Q

Gateway Control Module Audi A3 8V Volkswagen MK7 ECU Unit 5Q0907530Q

Product currently unavailable

Part no. 8H0035225J

Audi A4 B7 Cabrio Aerial Antenna Amplifier Module Unit Left N/S 8H0035225J

Product currently unavailable

Part no. 4G0906093F

Audi A6 C7 Fuel Pump Control Unit Module 4G0906093F

Product currently unavailable

Part no. 4G0959754K

Audi A6 C7 Ignition Smart Key Fob Lock Remote Alarm Button Control 4G0959754K

Product currently unavailable

Part no. 8T2907560E-1

Audi RS4 B8 4.2 FSI CFSA Quattro Engine ECU Kit 8T2907560E Ignition + Key

Product currently unavailable

Part no. 5Q0959655N

Audi A3 8V Air Module Control Sensor SRS System ECU Unit 5Q0959655N

Product currently unavailable

Part no. 8W0035465

Stereo Radio Amp Audi A5 F5 Sound System Speaker Amplifier 8W0035465

Product currently unavailable

Part no. 8T0907115A

Audi A5 8T 1.8 TFSI CABD 170HP Engine Control Unit ECU 8T0907115A Manual

Product currently unavailable

Part no. 03G906056S-1

Audi A3 8P 1.9 TDI BLS 105HP Engine Control Unit ECU Kit 03G906056S Manual

Product currently unavailable

Part no. 02E911024C

Starter Motor Audi Q3 8U Volkswagen Passat B7 Engine Starter Actuator 02E911024C

Product currently unavailable

Part no. 06M911022D

Audi Q7 4M Starter Motor Engine Diesel Valeo 06M911022D

Product currently unavailable

Part no. 8X0971845A

Audi A1 8X Fuse Relay Box Electrical Control Unit Module 8X0937124

Product currently unavailable

Part no. 4B0035186Q

Audi TT 8N Radio Media Player Audio CD Head Unit Player Concert 4B0035186Q

Product currently unavailable

Part no. 1K0953549DB

Audi A3 8P Steering Wheel Position Angle Sensor Control Unit Module 1K0953549DB

Product currently unavailable

Part no. 5Q0915181H

Audi A3 8V Negative Battery Terminal Cable Harness Wiring Loom 5Q0915181H

Product currently unavailable

Part no. 4E0910336H

Audi A6 C6 Q7 4L Bluetooth Telephone Control Module ECU 4E0910336H 4E0862335

Product currently unavailable

Part no. 06K903026C

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

Product currently unavailable

Part no. 06H903017EX

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

Product currently unavailable

Part no. 8X0959795D

Audi A1 8X Rear Door Module Left N/S Control Unit ECU 8X0959795D

Product currently unavailable

Part no. 03C906027CF-1

Audi A1 8X 1.4 TFSI CAVG 185HP Petrol Engine ECU Kit Ignition + Key 03C906027CF

Product currently unavailable

Part no. 8E0035192D

Audi A4 B7 Navigation System Car Sat Nav Computer Head Unit 8E0035192D

Product currently unavailable

Part no. 8H0959255A

Audi A4 B7 Cabrio Folding Top Roof ECU Module Control Unit 8H0959255A

Product currently unavailable

Part no. 03G906016KN

Audi A4 B7 BPW 2.0 TDI 140HP Diesel Engine Control Unit ECU 03G906016KN Manual

Product currently unavailable

Part no. RHD-8K0959655

Audi A4 B8 Air Module Control Unit ECU Crash Control 8K0959655J

Product currently unavailable

Part no. 8X0959655B

Audi A1 8X Air Module Control Unit Sensor 8X0959655B

Product currently unavailable

Part no. 4G0907637

Audi A7 4G8 ESP Yaw Rate Module Control Unit Sensor ECU 4G0907637H

Product currently unavailable

Part no. 8W8959107D

Audi A5 F5 Rear Hatch Tailgate Boot Lid Control Module Unit ECU 8W8959107D

Product currently unavailable

Part no. 02T911023M

Audi A3 8P 1.6 MPI Petrol Starter Motor Engine 02T911023M

Product currently unavailable

...

Showing 1882-1980 of 2404 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