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. A6519009502

Mercedes W176 A200 CDI OM651.930 136HP Engine Module ECU A6519009502 Automatic

Product currently unavailable

Part no. A2129000006

Fuse Box Mercedes W212 Front Relay Control Unit Electric Module SAM A2129000006

Product currently unavailable

Part no. A0009062302

Starter Motor Mercedes W639 W906 Diesel Engine A0009062302

Product currently unavailable

Part no. A1718200386-1

Mercedes SLK R171 Stereo Radio CD Player Head Unit A1718200386

Product currently unavailable

Part no. A2215420417-MB

Parking Sensor Mercedes W169 W204 W212 PDC Sensor Front Mountain Gray 787

Product currently unavailable

Part no. A1635422218

Mercedes ML W163 SRS Control Module Sensor Unit Temic A1635422218

Product currently unavailable

Part no. A2087600104

Mercedes-Benz CLK W208 Front Left Right Door Interior Handle Bowden Pull Cable

Product currently unavailable

Part no. A1725400950

Mercedes SLK R172 Relay Fuse Box Control Unit A1725400950

Product currently unavailable

Part no. A2039000000-1

Mercedes CL203 Head Unit CD Player Radio Audio Controller Unit A2039000000

Product currently unavailable

Part no. A2038201786

Mercedes-Benz C-Class W203 CD Player Audio Stereo Radio Head Unit A2038201786

Product currently unavailable

Part no. A0155429317

Speed Sensor Mercedes Sprinter W906 Impuls Control Unit Module A0155429317

Product currently unavailable

Part no. A2215408745

Mercedes W221 Fuse Box Control Unit SAM Module Relay A2215408745

Product currently unavailable

Part no. A2125452640

Mercedes W212 Control Unit Module Bracket Holder Mount A2125452640

Product currently unavailable

Part no. A6429002900-9

Mercedes W164 ML350 CDI OM642.820 231HP Engine Control Unit ECU A6429002900

Product currently unavailable

Part no. A2035452901

Mercedes-Benz C-Class W203 Fuse Box Control Unit Module SAM A2035452901

Product currently unavailable

Part no. A2649060400

Mercedes W205 W257 Starter Engine Motor A2649060400

Product currently unavailable

Part no. A1729008600

Mercedes W204 Display Screen Multimedia Navigation Dashboard Unit A1729008600

Product currently unavailable

Part no. A2129009425-1

Mercedes SLK R172 Fuse Box Relay Control Unit SAM Module A2129009425

Product currently unavailable

Part no. A2124401251

Door Cable Mercedes W212 Wiring Loom Front Right O/S Driver Side A2124401251

Product currently unavailable

Part no. A9068200486

Radio Player Mercedes W639 W906 Audio Stereo CD Head Unit Display A9068200486

Product currently unavailable

Part no. A2115420518

Mercedes W211 W219 Earth Ground Cable Battery Wiring Loom Engine A2115420518

Product currently unavailable

Part no. A2059065806

Mercedes W205 W213 C253 Fuse Box Front Relay Control Unit Module A2059065806

Product currently unavailable

Part no. A2218705885

Mercedes W221 Night Vision System Camera Module Control Unit A2218705885

Product currently unavailable

Part no. A2128702751-1

Control Panel Mercedes W212 Comand Navi CD Switch Push-Button A2128702751

Product currently unavailable

Part no. A2085405706

Mercedes-Benz CLK W208 Front Left Right Door Wiring Loom Harness A2085405606

Product currently unavailable

Part no. A4479060117

Mercedes Vito W447 Front Fuse Box Relay Control Unit Module A4479060117

Product currently unavailable

Part no. A4479008006

Mercedes Vito W447 Door Module Front Right O/S Control Unit ECU A4479008006

Product currently unavailable

Part no. A2124401651

Door Cable Mercedes W212 Wiring Loom Front Left N/S Passenger Side A2124401651

Product currently unavailable

Part no. A2115400008

ABS Sensor Mercedes W211 C219 Front Brake Wiring Harness Right O/S A2115400006

Product currently unavailable

Part no. A6519006401

Mercedes GLC X253 220d 170HP 651.921 Engine Unit ECU A6519006401 Automatic

Product currently unavailable

Part no. A2095452801

SAM Module Mercedes CLK W209 C209 A209 Fuse Box Relay Control Unit A2095452801

Product currently unavailable

Part no. A1775407932-1

Mercedes W177 W247 Positive Battery Cable Lead Wire Starter A1775407932

Product currently unavailable

Part no. A2059007218-1

Mercedes GLC X253 Rear Trunk Lid Automatic Closing Lock Mechanism A2059007218

Product currently unavailable

Part no. A2129009328

Door Module Mercedes W204 W212 Front Right O/S Control Unit A2129009328

Product currently unavailable

Part no. A2139052109

MercedesW213 Rear Tailgate Boot Control Module Unit A2139052109

Product currently unavailable

Part no. A1679001320

Ignition Module Mercedes V177 Electronic Ignition Switch Keyless Control Unit

Product currently unavailable

Part no. A0009060903

Alternator Mercedes W166 W213 C292 OM651 Generator 14V 250A A0009060903

Product currently unavailable

Mercedes W204 S204 Airbag Module Air Bag SRS Control Unit ECU A2049013502

-5%

Part no. A2049013502

Mercedes W204 S204 Airbag Module Air Bag SRS Control Unit ECU A2049013502

Product currently unavailable

Part no. A0015422623

PDC Display Mercedes W639 Front Parking Sensor Screen Control Unit A0015422623

Product currently unavailable

Part no. A2129015706

Mercedes W212 Display Screen Multifunction Navigation Dashboard A2129015706

Product currently unavailable

Part no. A2088206010

Mercedes W202 C208 W208 Alarm Sensor Module Unit A2088206010

Product currently unavailable

Part no. A9060034199

Mercedes-Benz Sprinter W906 Front Left N/S Door Wiring Loom Harness A9060005999

Product currently unavailable

Part no. A1725420023-1

Parking Sensor Display Mercedes W176 W204 W246 Dashboard Panel PDC A1725420023

Product currently unavailable

Part no. A2038201311

Phone Adapter Mercedes W203 W211 Contact Plate Holder Telephone A2038201311

Product currently unavailable

Part no. A0051511601

Mercedes W168 Vaneo W414 Diesel Engine Speed Starter Motor A0051511601

Product currently unavailable

Part no. A2049060105-1

Mercedes W204 SAM Control Unit Module Fuse Box Relay Rear A2049060105

Product currently unavailable

Part no. A2129001327

Door Module Mercedes W204 W212 Rear Right O/S Control Unit Module A2129001327

Product currently unavailable

Part no. A0009068302

Mercedes Sprinter W907 Alternator Generator Engine Diesel 250A 14V A0009068302

Product currently unavailable

Part no. A0185454132

Mercedes W202 Ignition Engine Control Unit Module C180 M111 Petrol A0185454132

Product currently unavailable

Part no. A2035460180

Mercedes-Benz C-Class S203 W203 Cable Rail Guide Sensors ABS A2035460180

Product currently unavailable

Part no. A6429061000

Mercedes W204 W213 ML W166 OM642 Diesel Engine Starter Starting Unit A6429061000

Product currently unavailable

Part no. A1669005420

Mercedes W166 Radio Sat Nav CD Multimedia Control Central Head Unit A1669005420

Product currently unavailable

Part no. A4475401755

Earth Ground Cable Mercedes Vito W447 Positive Battery Lead Wiring A4475401755

Product currently unavailable

Part no. A0028272104-1

Mercedes W204 USB Port Cable Multimedia Interface Cable MI2-Ipod A0028272104

Product currently unavailable

Part no. A2048700196-3

Mercedes W204 Radio Player COMAND Navi CD Head Unit A2048700196

Product currently unavailable

Part no. A1699002100

Mercedes W245 Head Unit Radio CD Media Player Telephone Unit A1699002100

Product currently unavailable

Part no. A2129004008

Mercedes C207 Stereo Radio CD Player Head Unit A2129004008

Product currently unavailable

Mercedes Sprinter W906 Fuse Box Cover Trim Panel Lid Grey A6395450003

-5%

Part no. A9065450003-1

Mercedes Sprinter W906 Fuse Box Cover Trim Panel Lid Grey A6395450003

Product currently unavailable

Part no. A2105401530

Mercedes-Benz E W210 Battery Starter Alternator Positive Plus Cable A2105401530

Product currently unavailable

Part no. A2118703794

Mercedes W169 W211 W245 Sound Audio Amplifier Unit Harman Becker A2118703794

Product currently unavailable

Part no. A0131546802

Alternator Generator Mercedes W204 W212 OM651 14V 180A Engine Electrical Unit

Product currently unavailable

Part no. A2078205289

Mercedes C207 Rear Radio Amp Sound Amplifier Audio Getaway Becker A2078205289

Product currently unavailable

Part no. A6229000500-1

Mercedes W447 109CDI BE OM622.951 Engine Control Module ECU Kit A6229000500

Product currently unavailable

Part no. A2709002100-10

Mercedes C117 W176 45 AMG 133.980 Engine Control Unit ECU A2709002100 Automatic

Product currently unavailable

Part no. A2046800931

Mercedes W204 Dashboard Navigation Central Display Screen Monitor A2046800931

Product currently unavailable

Part no. A2469000112

Radio Head Unit Mercedes C117 W176 W246 Navi CD Player Navigation A2469000112

Product currently unavailable

Part no. A2661531491-5

Mercedes W169 A180 M266.940 116HP Engine ECU Kit A2661531491 Key Lock Automatic

Product currently unavailable

Part no. A2048700594-2

Mercedes W204 Radio Player COMAND Navi CD Head Unit A2048700594

Product currently unavailable

Part no. A2118705885

Air Bag Module Mercedes W211 Control Unit ECU Airbag Sensor A2118705885

Product currently unavailable

Part no. A2711505433

Mercedes R171 W203 Petrol Engine 271921 Wiring Harnes Loom A2711505433

Product currently unavailable

Part no. A2208703589

Navigation Player Mercedes W211 W219 DVD CD Reader Control Unit A2208703589

Product currently unavailable

Part no. A9064401066

Mercedes Sprinter W906 W907 Positive Battery Cable Wiring A9064401066

Product currently unavailable

Mercedes W176 W207 W246 USB Interface Multimedia Adapter Connector A1728202100

-15%

Part no. A1728202100

Mercedes W176 W207 W246 USB Interface Multimedia Adapter Connector A1728202100

Product currently unavailable

Part no. A1635457332

Mercedes ML W163 Comfort Control Module Central Electronics A1635457332

Product currently unavailable

Part no. A1648703726

Seat Module Mercedes X164 Rear Third Row Seats Control Module A1648703726

Product currently unavailable

Part no. A6511509000

Mercedes Sprinter W906 Diesel OM651 Engine Wiring Loom Harness A6511509000

Product currently unavailable

Part no. A2098206126

Mercedes W209 Convertible Rain Light Sensor Windscreen Module A2098206126

Product currently unavailable

Part no. A0141542702

Alternator Mercedes Vito W639 Sprinter W906 Generator 14V 120A Bosch A0141542702

Product currently unavailable

Part no. A2118702889

Mercedes W211 Radio Head Unit CD Audio Player Control Unit A2118702889

Product currently unavailable

Part no. A2035454901-1

Mercedes CL203 Fuse Box Control Unit Module SAM A2035454901

Product currently unavailable

Part no. A2711534691-3

Mercedes R171 SLK200 271.944 163HP Engine ECU Kit A2711534691 Key Lock Ignition

Product currently unavailable

Part no. A2118704726

Seat Module Mercedes W203 CLK W209 W211 Front Memory Control Unit A2118704726

Product currently unavailable

Part no. A2129004500

Mercedes C207 W212 Fuse Box Relay Control Unit SAM Module A2129004500

Product currently unavailable

Part no. A2539003809

Mercedes W253 Display Screen Monitor Radio Sat Nav Navigation Unit A2539003809

Product currently unavailable

Part no. A0065427018

Yaw Module Mercedes W221 ML W164 Rotation Rate Acceleration Sensor A0045423818

Product currently unavailable

Part no. A6519060026-2

Starter Motor Mercedes W204 W212 W639 OM651 Diesel Engine Starter A6519060026

Product currently unavailable

Part no. A1695451940-1

Fuse Box Mercedes W169 W245 Electrical Relay Control Module Unit A1695451740

Product currently unavailable

Part no. A1698202675

Mercedes W169 W245 Aerial Roof Antenna Radio Rod A1698202675

Product currently unavailable

Part no. A6429000401-1

Mercedes W166 ML350 Bluetec 4-Matic OM642.826 Engine ECU Kit Module A6429000401

Product currently unavailable

Part no. A2479009412

Bluetooth Module Mercedes W247 W447 Multimedia Control Unit ECU A2479009412

Product currently unavailable

Part no. A2049009410-1

Mercedes W204 CD Player Radio Stereo Navigation Sat Nav Head Unit A2049009410

Product currently unavailable

Part no. A6395450191

Mercedes Vito W639 Positive Battery Terminal Cover Cap Trim Red A6395450191

Product currently unavailable

Part no. A1648209585

Mercedes ML W164 Air Module System Control Unit A1648209585

Product currently unavailable

Part no. A1635402810

Mercedes-Benz M ML W163 OM612 Engine Wiring Harness Loom Cable A1635402810

Product currently unavailable

Part no. A2208203685

Mercedes W220 Headlight Head Lamp Control Module Unit A2208203685

Product currently unavailable

Mercedes-Benz A-Class W176 Front Door Cable Wiring Loom Harness A1765405408

-5%

Part no. A1765405408

Mercedes-Benz A-Class W176 Front Door Cable Wiring Loom Harness A1765405408

Product currently unavailable

Part no. A4475407880

Mercedes Vito W447 Front Passenger Side Fuse Box Control Unit Module A4475407880

Product currently unavailable

Part no. A2128702951-1

Control Panel Mercedes W212 Comand Navi CD Switch Push-Button A2128702951

Product currently unavailable

Part no. A0009068802-1

Mercedes Sprinter W906 Alternator Generator Diesel 180A 14V A0009068802

Product currently unavailable

...

Showing 2872-2970 of 3267 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