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. 4H0907428D

Audi A8 D4 Rear Reversing Camera Module View Camera Control Unit ECU 4H0907428D

Product currently unavailable

Part no. 8E0959651B

Audi A3 8P Crash Impact Airbag Sensor Unit Module Air Bag 8E0959651B

Product currently unavailable

Part no. 130831041000

Audi A5 8T Headlight Inner LED Inner Module Unit 6NHM0000 130831041000

Product currently unavailable

Part no. 0AM911023R

Audi A3 8V 1.4 TSI Petrol Starter Motor Engine Actuator Unit 0AM911023R

Product currently unavailable

Part no. 83F971104F

Audi Q3 F3 Rear Bumper PDC Wiring Loom Cabling Parking Sensor 83F971104F

Product currently unavailable

Part no. 8K5907551D

Audi S4 B8 3.0 TFSI CGWC Quattro 333HP Engine ECU 8K5907551D Automatic

Product currently unavailable

Part no. 8V5035225

Audi A3 8V Keyless Entry Amplifier Control Box Module Aerial Antenna 8V5035225

Product currently unavailable

Part no. 8N8035223

Audi TT 8N Amplifier BOSE Premium Audio Sound System Module 8N8035223

Product currently unavailable

Part no. 4F0910289N-1

Audi A6 S6 RS6 C6 4F Convienience Comfort Module Unit ECU 4F0910289N

Product currently unavailable

Part no. 4G1035192A

Audi A7 4G Multimedia CD Radio Control Head Unit 4G1035192A

Product currently unavailable

Part no. 4G0907553G

Audi A8 D4 Dynamic Air Suspension Control Unit Module ECU WABCO 4G0907553G

Product currently unavailable

Part no. 8H0035223E

Audi A4 B7 Convertible Rear Speaker Amplifier Blaupunkt Right O/S 8H0035223E

Product currently unavailable

Part no. 5Q0907521D

Audi A3 8V Heater Blower Motor Fan Resistor 5Q0907521D

Product currently unavailable

Part no. 5Q0906121F

Audi Q3 8U 2.0 TDI Fuel Pump Sender Control Relay Module Unit ECU 5Q0906121F

Product currently unavailable

Part no. 4H0907063BA

Audi A6 C7 Onboard Supply BCM Body Control Module Unit ECU 4H0907063BA

Product currently unavailable

Part no. 8W9971104A

Audi S4 B9 Wiring Loom Set PDC Rear Complete Harness Parking Sensor 8W9971104A

Product currently unavailable

Part no. 8K2971228G

Audi A5 8T 1.8 TFSI Starter Alternator Harness Wiring Cable 8K2971228G

Product currently unavailable

Part no. 8V0857273N-1

Audi A3 S3 8V Head Up Navigation Multimedia Screen Display Unit 8V0857273N

Product currently unavailable

Part no. 2100493N

Audi A5 8T Seat Cable Front Left Right N/O/S Wiring Loom Harness 2100493N

Product currently unavailable

Part no. 8K0959793J

Audi A4 B8 Door Module Front Right O/S Control Unit Module ECU 8K0959793J

Product currently unavailable

Part no. 8K0907064JJ

Audi RS4 B8 Body Control Comfort Unit Module BCM Unit ECU 8K0907064JJ

Product currently unavailable

Part no. 8T0907468F

Audi A5 8T Gateway Control Module Unit ECU 8T0907468F

Product currently unavailable

Part no. 8K0907063

Audi A4 B8 Body Control Unit Basic Module BCM 8K0907063

Product currently unavailable

Part no. 8K0971228P

Audi A4 B8 Starter Alternator Wiring Loom Cable Harness 8K0971228F

Product currently unavailable

Part no. 8P0907063AD

Audi TT 8J Body Comfort Control BCM Module Unit ECU 8P0907063AD

Product currently unavailable

Part no. 8F0959255

Audi A5 8F Convertible Folding Roof Module Control Unit 8F0959255

Product currently unavailable

Part no. 8E0907279J

Audi A4 B7 Body Comfort Control Body Power Supply Module Unit BCM ECU 8E0907279J

Product currently unavailable

Part no. 8K0959794

Audi A4 B8 Door Module Rear Right O/S Control Unit Module ECU 8K0959794

Product currently unavailable

Part no. 8R2907115-1

Audi Q5 8R 2.0 TFSI CNCD 224HP Engine Unit ECU Kit 8R2907115 Key Ignition Manual

Product currently unavailable

Part no. 04L907309E-1

Audi A3 8V 1.6 TDI CRKB 110HP Engine ECU Kit Ignition + Key 04L907309E Manual

Product currently unavailable

Part no. 8P7907115

Audi A3 8P 1.8 TFSI BZB 160HP Engine Control Unit Module ECU 8P7907115 Automatic

Product currently unavailable

Part no. 4B0035152C-1

Audi TT Mk1 8N Radio Stereo Player Head Unit Chorus 4B0035152C

Product currently unavailable

Part no. 5Q0959655L

Audi A3 8V Air Module Control Sensor ECU Unit 5Q0959655L

Product currently unavailable

Part no. 4B0035186D

Radio Player Audi TT 8N Audio Head Unit Cassette Player Concert 4B0035186D

Product currently unavailable

Part no. 8K0959793B

Audi A4 B8 Door Module Control Unit ECU Front Driver's Side 8K0959793B

Product currently unavailable

Part no. 03L906023PP-1

Audi A3 8P 1.6 TDI 105HP CAYC Engine ECU Kit 03L906023PP Keys + Ignition Manual

Product currently unavailable

Part no. 8N8035111A-1

Audi TT 8N Disc CD Changer Player Reader System Head Unit 8N8035111A

Product currently unavailable

Part no. 5Q0937084AA

Audi A3 8V Module BCM Body Control Unit Module ECU 5Q0937084AA

Product currently unavailable

Part no. 8P0959433F

Audi A3 8P CCM Covenience Control Module Unit Relay Board ECU HELLA 8P0959433F

Product currently unavailable

Part no. 8N0955531B

Audi TT 8N Wiper Relay Electrical Unit Brown 8N0955531B

Product currently unavailable

Part no. 4H0971365J

Audi A8 D4 Seat Cable Front Left Right N/O/S Seatbelt Warning Wiring 4H0971365J

Product currently unavailable

Part no. 8V1035035A-1

Audi A3 S3 8V Head Unit MIB High Multimedia Player CD SD Card Sat Nav 8V1035035A

Product currently unavailable

Part no. 06Q911024

Audi A4 B8 B9 A6 C8 Engine Starter Motor Denso 2.0 TFSI Petrol 06Q911024

Product currently unavailable

Part no. 7P0915105C

Audi Volkswagen Varta Car Battery AGM 92Ah 850A 7P0915105C

Product currently unavailable

Part no. 8H0035225R

Audi A4 B7 Aerial Antenna Amplifier Module 8H0035225R

Product currently unavailable

Part no. 4F0907383C

Audi A6 C6 Tow Bar Trailer Control Module Unit 4F0907383C

Product currently unavailable

Part no. 8E0910115H-1

Audi A4 B7 2.0 TFSI BGB Quattro 200HP Engine ECU Kit Ignition 8E0910115H + Keys

Product currently unavailable

Part no. 4G0035223C

Audi A6 C7 Audio Sound System Amplifier Bose 4G0035223C

Product currently unavailable

Part no. 03G903139D

Audi A4 B7 Engine Alternator Mount Support Bracket 1.9 2.0 TDI 03G903143D

Product currently unavailable

Part no. 4E0910336MX

Audi A6 C6 Bluetooth Multimedia Interface Control Module Unit ECU 4E0910336MX

Product currently unavailable

Part no. 8X0919884E

Audi Q3 8U A1 8X SD Card Map Pilot Navigation Europe 2013 8X0919884E

Product currently unavailable

Part no. 5Q0937084DH

Volkswagen Crafter Audi A1 A3 8V Body Control Module Unit ECU 5Q0937084DH

Product currently unavailable

Part no. 8K2907115P-1

Audi A5 8T A4 B8 8K 2.0 TFSI CDNC 211HP Engine ECU Kit 8K2907115P Key + Ignition

Product currently unavailable

Part no. RHD-4F2864261AP-1

Audi A6 C6 Panel Radio Multimedia Switch Control 4F2864261AP

Product currently unavailable

Part no. 8X0035110C

8X0035110C A1 8X A4 B8 A5 8T CD Player Changer 6 Disc 8X0035110C

Product currently unavailable

Part no. 83A962239

Audi A3 8Y Q3 F3 Rear Hatch Boot Lid Tailgate Opening Cable Wiring 83A962239

Product currently unavailable

Part no. 8V0907357A

Audi A3 8V Headlight Range Cornering Adjustment Control Module 8V0907357A

Product currently unavailable

Part no. 8W0907064CB

Audi A4 B9 BCM Body Control Module Unit ECU 8W0907064CB

Product currently unavailable

Part no. 8K0959663C

Audi A8L 4H Voltage Converter Stabilizer Control Module Unit ECU 8K0959663C

Product currently unavailable

Part no. 4F0910223C

Audi A6 C6 Hifi Audio Sound Speakers Amplifier Control Unit ECU 4F0910223C

Product currently unavailable

Part no. 8W9971104M

Audi A4 B9 Rear Bumper PDC Parking Sensor Harness Wiring Loom Cable 8W9971104M

Product currently unavailable

Part no. 4F0910223M

Audi A6 C6 Amplifier Audio Sound Control Unit Module Controller 4F0910223M

Product currently unavailable

Part no. 4FO903291

Audi A6 C6 2.0 TDI Relay Condenser 4FO903291

Product currently unavailable

Part no. 8H0035225

Audi A4 B8 Aerial Antenna Amplifier Module Right O/S 8H0035225

Product currently unavailable

Part no. RHD-5Q2971111AP-1

Audi A3 8V Power Steering Rack Wiring Harness Loom Cable 5Q2971111AP

Product currently unavailable

Part no. 06F903023H

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

Product currently unavailable

Part no. 8T0971365C

Audi A5 8T Seat Cable Front Left Right N/O/S Wiring Loom Harness 8T0971365C

Product currently unavailable

Part no. 1K0937517

Audi RS3 8V Potential Power Distribution Junction Box Jump Point 1K0937517

Product currently unavailable

Part no. 8R0959655E

Audi Q5 8R Air Module SRS System Control Sensor ECU Unit 8R0959655E

Product currently unavailable

Part no. 03L906023M-1

Audi A3 8P 1.6 TDI 105HP CAYC Diesel Engine ECU Kit 03L906023M 2 Keys Manual

Product currently unavailable

Part no. 8K0915181N

Audi A1 8X Negative Battery Terminal Cable Wiring 8K0915181N

Product currently unavailable

Part no. 5Q0937084AQ

Audi A3 8V Body Control Comfort Unit Module BCM Unit ECU 5Q0937084AQ

Product currently unavailable

Part no. 8W5035035A

MMI Multimedia Audi A4 B9 A5 F5 Q5 FY Navigation Control Head Unit 8W5035035A

Product currently unavailable

Part no. 8X0035110B

Audi A5 8T 6 Disc CD Changer Magazine Head Unit MMI 8X0035110B

Product currently unavailable

Part no. 07K903023J

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

Product currently unavailable

Part no. 8T0907376

Audi RS4 B8 Electronic Regulated Damping Module Unit 8T0907376

Product currently unavailable

Part no. 8W0959121F

Audi A4 B9 A5 F5 Air Module Sensor Crash Sensor Pressure 8W0959121F

Product currently unavailable

Part no. 3Q0907530AG

Audi Q2 Q3 F3 1.5 TFSI Gateway Control Unit Module ECU 3Q0907530AG

Product currently unavailable

Part no. 8K0919475E

Audi A4 B8 PDC Parking Assist Sensor Control Module Unit ECU 8K0919475E

Product currently unavailable

Part no. 4L0919283B

Audi A6 C6 Parking Control Unit ECU Module Sensor PDC 4L0919283B

Product currently unavailable

Part no. 03C906016DL

Audi A1 8X 1.4 TSI CAXA 122HP Engine Control Unit ECU 03C906016DL Manual

Product currently unavailable

Part no. 4F0906093G

Audi A4 B7 Fuel Pump Sender Control Relay Module Unit ECU 4F0906093G

Product currently unavailable

Part no. 4G8959793E

Audi A6 C7 Front Door Control Module Unit ECU Driver's Side 4G8959793E

Product currently unavailable

Part no. 4L0907553

Audi Q7 4L Air Suspension Adjustment Module Control Unit ECU 4L0907553

Product currently unavailable

Part no. 4F0907468D

Audi A6 C6 Diagnostic Interface Gateway Control Module Unit ECU 4F0907468D

Product currently unavailable

Part no. 8K0907063AC

Audi A5 8T Onboard Comfort Supply Control Module Unit ECU 8K0907063AC

Product currently unavailable

Part no. 8U0907468AE

Audi Q3 8U 2.0 TDI DFTA Gateway Module Control Unit ECU 8U0907468AE

Product currently unavailable

Part no. 8W0959595M

Audi A4 B9 A5 F5 Door Module Rear Right Left N/O/S Control Unit 8W0959595M

Product currently unavailable

Part no. 8R0971095D

Audi Q5 8R Front Bumper PDC Parking Sensor Wiring Harness Loom 8R0971095D

Product currently unavailable

Part no. 8K0907064FF

Audi A4 S4 B8 Body Control Comfort Unit Module BCM2 Unit ECU 8K0907064FF

Product currently unavailable

Part no. 04C903023L

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

Product currently unavailable

Part no. RHD-8R2035666J

Audi A4 B8 Multimedia Stereo Sat Nav SD CD Player Radio Head Unit 8R2035666J

Product currently unavailable

Part no. 8X0959655A

Audi A1 8X Air Module Sensor Control Unit Module 8X0959655A

Product currently unavailable

Part no. 4F9035225H

Audi A6 C6 Antenna Amplifier Control Unit Module ECU 4F9035225H

Product currently unavailable

Part no. 1K0907530J

Audi A3 8P Body Gateway Module ECU Control Unit 1K0907530J

Product currently unavailable

Part no. RHD-8R2035666

Audi A5 8T Multimedia Sat Nav MMI 3G Radio Player Unit Harman 8R2035666

Product currently unavailable

Part no. 4L0910409D-1

Audi Q7 4L 4.2 TDI Quattro BTR 326HP Engine ECU Kit Set 4L0910409D Key Automatic

Product currently unavailable

Part no. 8P0959433

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

Product currently unavailable

Part no. 02M911021S

Audi TT FV Starter Motor Engine Diesel 02M911021S

Product currently unavailable

...

Showing 1486-1584 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