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. XAV-AX3250

SONY DAB Bluetooth Stereo Screen Display Multimedia Head Unit XAV-AX3250

Product currently unavailable

Part no. 9320241

BMW G30 G31 G11 F15 F16 Rear Entertainment Remote Control Rear 9320241

Product currently unavailable

Part no. 5G6971829B

Volkswagen Golf CD1 Tailgate Trunk Lid Wiring Harness Rubber Cover 5G6971829B

Product currently unavailable

Part no. 0AM911023T

Volkswagen Touran 1T 1.4 TSI Petrol Engine Starter Motor 0AM911023T

Product currently unavailable

Part no. STARLINE-70AH-ACCUMULATOR-1

Starline 12V Accumulator Battery 70Ah 760A

Product currently unavailable

Part no. A1725420023-1

Parking Sensor Display Mercedes W176 W204 W246 Dashboard Panel PDC A1725420023

Product currently unavailable

Part no. rhd-7575450

BMW 5 6 E60 E63 LCI Petrol N53 Wiring Loom Harness Engine 7575450

Product currently unavailable

Part no. 7576921

Mini Cooper R55 R56 R57 Mitsubishi Engine Alternator Generator Petrol 7576921

Product currently unavailable

Part no. A0155457032

Mercedes W124 S124 Ignition Engine Control Unit Module A0155457032

Product currently unavailable

Part no. 9399269

BMW X5 F15 Front KaFAS Camera Speed Limit Control ECU Module Unit 9399269

Product currently unavailable

Part no. 8E0927355

Audi A4 B7 Cabrio Convertible Roof Control Module Box Lid Storage 8E0927355

Product currently unavailable

Part no. 9264973

Seat module BMW X5 E70 Seat Control Unit Module ECU 9264973

Product currently unavailable

Part no. 8E0035192Q

Audi A4 B7 CD Player Navigation System Car Sat Nav Computer Head Unit 8E0035192Q

Product currently unavailable

Part no. A6421507391

Mercedes W221 S320 CDI 642.930 235HP Engine Control ECU A6421507391 Automatic

Product currently unavailable

Part no. YUASA YBX 9000 AGM 80Ah Accumulator-1

YUASA YBX 9000 AGM Start Stop 12V Accumulator Battery 80Ah 800A YBX9115

Product currently unavailable

Part no. 9176884-2

BMW E92 ECU BCM Body Control Module H3 Junction Box 61359176884 9176884

Product currently unavailable

Part no. A0009823108-1

Mercedes 12V Accumulator Battery 74Ah 680A A0009823108

Product currently unavailable

Part no. 7553166-6

BMW E60 E90 E91 N52 325i 525i Engine ECU Kit DME 7553166 CAS2 Key Automatic

Product currently unavailable

Part no. A2079059702

Mercedes-Benz W207 A207 Radio Aerial Antenna Amplifier Module Unit Right O/S

Product currently unavailable

Part no. 7586134-5

Mini Cooper S R56 N14 1.6 174HP ECU Kit DME 7586134 + CAS3 + Keys Automatic

Product currently unavailable

Part no. A2059061905

Mercedes W205 Centre Console Lighting Wiring Harness Cable Loom A2059061905

Product currently unavailable

Part no. 9338910

Mini Cooper F56 Wiring Driver's Loom Front Right O/S Door Cables 9338910

Product currently unavailable

Part no. 7527072-8

BMW Z4 E85 2.5i M54 192HP Engine ECU Control Unit Module DME 7527072 Manual

Product currently unavailable

Part no. 8689723

BMW F20 F21 LCI M140i B58 Petrol ECU Control Unit Module DDE 8689723 Automatic

Product currently unavailable

Part no. 9293404

BMW X3 F25 CIC Sat Nav Professional Infotainment Radio Player Head Unit 9293404

Product currently unavailable

Part no. 4E0035729C

Audi S4 B8 Bluetooth Interface MMI Multimedia Control Module ECU Unit 4E0035729C

Product currently unavailable

Part no. 8652745-1

Mini Cooper R60 R61 ALL4 N16 122HP Engine Control Unit ECU DME 8652745 CAS3 Key

Product currently unavailable

Part no. 4H0959793R

Audi A8 D4 4H Front Door Control Module Unit ECU Driver's Side 4H0959793R

Product currently unavailable

Part no. 9297276-1

Display Screen BMW F12 F13 Central Information Monitor 10" CID 9297276

Product currently unavailable

Part no. 7585249

BMW E81 E87 LCI 116i E90 316i 115HP N45N Engine Unit ECU DME 7585249 Automatic

Product currently unavailable

Part no. 9383050

BMW E90 LCI Footwell Light Module Control Unit ECU Lear FRM3R PL2 9286887

Product currently unavailable

Part no. A6421508900-2

Mercedes W212 E350 CDI OM642 Engine Unit ECU Kit A6421508900 Keys Lock Automatic

Product currently unavailable

Part no. 9326437-1

BMW F30 F31 Wiring Loom Harnes Front Passenger Door Cables Harness 9326437

Product currently unavailable

Part no. 03E906023L

Volkswagen Polo 6R 1.2 MPI CGPB 60HP Engine Control ECU 03E906023L Manual

Product currently unavailable

Part no. 9871349

BMW G30 G31 X3 G01 Control Unit Module Heater Ionizer ECU 9871349

Product currently unavailable

Part no. A2139060303

Mercedes W205 Navigation 2015/2016 Update SD Card Road Map Europe A2139060303

Product currently unavailable

Part no. 9140245-1

BMW Z4 Series E89 Antenna Base 9140245 65209140245

Product currently unavailable

Part no. Halfords 76Ah Accumulator-3

Halfords 12V Calcium Accumulator Battery 76Ah 680A HCB096

Product currently unavailable

Part no. A6519009302-2

Mercedes W639 113 CDI 651.940 136HP Engine Module ECU Kit A6519009302 Key Lock

Product currently unavailable

Part no. 9319918-1

BMW F45 F46 X1 F48 Air Duct Front Slam Panel Flap Control Motor Drive E05078-100

Product currently unavailable

Part no. 8631725-3

BMW F20 F30 F32 120i 320i 420i N20 184HP Engine Unit ECU DME 8631725 Automatic

Product currently unavailable

Part no. A2055402324

Mercedes W205 Center Console Ambient Lighting Light Wiring Harness A2055402324

Product currently unavailable

Part no. rhd-1439207

Engine Wiring BMW E39 Petrol Engine M52 Ignition Coil Wiring Harness 1439207

Product currently unavailable

Part no. 7429966

BMW i3 I01 Hybrid Rex Petrol Fuel Pump Control Unit Module 7429966

Product currently unavailable

Part no. A4479000002

Mercedes W447 Electronic Module ECU Control Unit A4479000002

Product currently unavailable

Part no. 9225185

BMW 1 3 Series E81 E87 E93 Antenna Phone With Cradle Mount 9225185

Product currently unavailable

Part no. 06K907425B-8

Skoda Octavia RS 5E 2.0 TSI CHHB 220HP Engine Control ECU 06K907425B Automatic

Product currently unavailable

Part no. 4G8959795F

Audi A7 4G Rear Door Control Module Unit ECU Left Right N/O/S 4G8959795H

Product currently unavailable

Part no. 1431172-2

Ford Transit Mk7 Engine Cooling Fan Radiator Module Control Unit 940002904

Product currently unavailable

Part no. GK21-14D378-AA

Ford Transit Custom Adblue Harness Loom Wiring 2.0 EcoBlue GK21-14D378-AA

Product currently unavailable

Part no. A6461501191

Mercedes W639 Vito OM646 111CDI 116HP Engine Unit Module ECU A6461501191 Manual

Product currently unavailable

Part no. 4F0907279C

Audi Q7 4L Onboard Supply Body Control Comfort BCM Unit Module 4F0907279C

Product currently unavailable

Part no. 1K4971121G

Volkswagen VW Golf Mk5 Door Harness Loom Cable Wiring Front Passenger 1K4971121G

Product currently unavailable

Part no. 7600020-10

Mini Cooper R55 R56 N12 DME Petrol Engine Control Unit ECU 7600020 Automatic

Product currently unavailable

Part no. A2721531291

Mercedes CL203 CLC 350 M272.960 272HP Engine Module ECU Kit A2721531291 2 Keys

Product currently unavailable

Part no. 9380333

BMW X3 F25 Central Gateway Module Control Unit Lear ZGW-02 8SK 9380333

Product currently unavailable

Part no. 8570442

Engine Wiring BMW F25 F26 2.0dX B47 Loom Module Harness Cable Automatic 8570442

Product currently unavailable

Part no. A9079005405

Mercedes Sprinter W907 Body Control Module Control Unit BCM V2 ECU A9079005405

Product currently unavailable

Part no. 8P4971035L

Audi A3 8P Door Wiring Front Right O/S Harness Loom Cable 8P4971035L

Product currently unavailable

Part no. 7533651-1

BMW E60 E61 530i M54 231HP ECU Kit DME 7533651 + CAS2 + 2 Keys Automatic

Product currently unavailable

Part no. A2048704926

Rain Sensor Mercedes W204 Light Control Unit Front Windscreen A2048704926

Product currently unavailable

Part no. 5QS915181

Audi A3 S3 8Y Battery Negative Terminal Cable Wire 5QS915181

Product currently unavailable

Part no. 69502354

Iveco Daily Towing Tow Bar Trailer Hook Module Control Unit 69502354

Product currently unavailable

Part no. 8512292-2

BMW E90 E91 LCI N47N 316d 116HP Engine ECU Kit DDE 8510832 + CAS3 + Key Manual

Product currently unavailable

Part no. 7561834-6

BMW X3 E83 2.0i N46 150HP Engine ECU DME 7561834 Manual

Product currently unavailable

Part no. 5QA919294

PDC Module Audi A3 8V Q2 GA VW Crafter PDC Assist Control Unit 5QA919294

Product currently unavailable

Part no. SP343ZZC

Right Connections Electronic CAN Bus Trailer Module Control Unit 12V SP343ZZC

Product currently unavailable

Part no. 9897880-3

Mini Cooper S F55 F56 B48C 192HP Petrol Engine Unit ECU DME 9897880 Manual

Product currently unavailable

Part no. A1715451701-1

Fuse Box Mercedes SLK R171 Roadster SAM Relay Box Control Module A1715451701

Product currently unavailable

Part no. 8638198-4

BMW F20 F30 116i 316i N13 136HP Engine ECU Kit DME 8625241 FEM Key Manual

Product currently unavailable

Part no. 8574095-7

BMW F20 F21 F30 F31 116d 316d 116HP N47 Diesel Engine Control ECU 8574095 Manual

Product currently unavailable

Part no. KT1T18D832BR

Ford Transit Connect Music Radio Stereo CD Player Head Unit KT1T18D832BR

Product currently unavailable

Part no. 7269531

BMW F07 F10 F11 Xenon Headlight Control Module Lear TMS 7269531

Product currently unavailable

Part no. 7620985-7

Mini Cooper S R56 LCI R60 N18 1.6 184HP Engine ECU Kit DME 7620985 Automatic

Product currently unavailable

Part no. 3455443

Mini R57 Convertible Fuse Distribution Box Relay Board SPEG 3455443

Product currently unavailable

Part no. 5H0919605B

Volkswagen GOLF CD1 Multimedia Display Screen Radio Sat Nav Head Unit 5H0919605B

Product currently unavailable

Part no. 1393415-3

BMW E90 E91 F10 Mini R50 R52 Change Over Contact Relay Grey 5 Pins Set 1393415

Product currently unavailable

Part no. 1320587A

WEBASTO Thermostat Control Unit 12/24V 1320587A

Product currently unavailable

Part no. 9316923

BMW F30 Kafas Camera Module Based Drive Support Lane Assist Control Unit 9316923

Product currently unavailable

Part no. 6831173

Mini F60 Front Door Harness Loom Cable Wiring Left Right N/O/S 6831173

Product currently unavailable

Part no. 8P0907357C

Audi A3 8P A6 C6 Headlight Levelling Module Control Unit ECU 8P0907357C

Product currently unavailable

Part no. VARTA-AGM-105AH

VARTA Accumulator Battery 105Ah 900A 12V Silver Dynamic AGM

Product currently unavailable

Part no. A2711538479

Mercedes W203 C118 M271.946 143HP Engine Control ECU A6121536379 Automatic

Product currently unavailable

Part no. GV6112A650KA

Ford Transit Connect MK2 1.5 TDCI 101HP Engine Unit ECU GV6112A650KA Manual

Product currently unavailable

Part no. 9166897-1

Audio Amplifier HiFi BMW E87 E90 Top Sound System Control Unit 9177752

Product currently unavailable

Part no. 8489449-1

BMW F36 LCI Petrol 430i B48 Engine Module ECU Kit DME 8489449 Keys FEM Automatic

Product currently unavailable

Part no. 9366338

Dashboard Wiring BMW G30 G31 Front Centre Console Loom Harness 9366338

Product currently unavailable

Part no. A0038207926

Door Module Mercedes W221 Door Control Unit Module A0038207926

Product currently unavailable

Part no. A6421506691-1

Mercedes W164 ML280 CDI OM642.940 Engine Control Unit ECU Kit A6421506691 Key

Product currently unavailable

Part no. A2751500879-1

Mercedes S65 W221 AMG M275 Engine ECU Kit Ignition + 2 Key A2751500879 Automatic

Product currently unavailable

Part no. 8W0907217B

Audi A4 B9 Front Windscreen Windshield Lane Assist Camera 8W0907217B

Product currently unavailable

Part no. 8XA035192C

Audi A1 8X Mulitmedia MMI Player Audio Stereo Radio Head Unit 8XA035192C

Product currently unavailable

Part no. 7595365

BMW Z4 Series E89 23i 30i N52N Engine Wiring Loom Harness 7595365 7584717

Product currently unavailable

Part no. A6461532891-2

Mercedes Vito W639 111 CDI 646.982 116HP Engine ECU Kit A6461532891 Key Lock

Product currently unavailable

Part no. 8574351-1

BMW X1 E84 18d Diesel N47N Engine Unit ECU Kit DDE 8574351 + CAS3 + Key Manual

Product currently unavailable

Part no. 8K0971589A

Audi S4 B8 Steering Wheel Air Module Wiring Harness Loom Cable 8K0971589A

Product currently unavailable

Part no. 8735982

BMW G30 G31 F90 M5 G11 Antenna Aerial Diversity Amplifier Unit 8735982

Product currently unavailable

Part no. rhd-9621899

Display Cover BMW G20 G21 G22 G28 LCI Trim Panel Frame Dashboard Screen 9621899

Product currently unavailable

Part no. 7432799

BMW X5 X6 F15 F16 Diesel Adblue Module Control Unit ECU 7432799

Product currently unavailable

...

Showing 17326-17424 of 21244 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