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. A2219008004

Mercedes W221 Sound Audio Amplifier Control Unit Module A2219008004

Product currently unavailable

Part no. A0035403945

Mercedes W209 Convertible Tire Pressure Module Unit Bracket Mount A0035403945

Product currently unavailable

Part no. A2118202675

Mercedes-Benz E-Class S211 Estate Touring GPS Nav Satnav Antenna A2118202675

Product currently unavailable

Part no. A6469002700-1

Mercedes Vito W639 OM646.980 Engine Unit ECU Kit A6469002700 Key Lock Automatic

Product currently unavailable

Part no. a4479050104

Earth Ground Cable Mercedes Vito W447 Negative Battery Lead Wiring A4479050104

Product currently unavailable

Part no. A2188200087

Mercedes W212 Adapter Car Radio Stereo MP3 AUX Port Attachment Plug A2188200087

Product currently unavailable

Part no. A6421501230-1

Mercedes W219 CLS350 CDI OM642.920 Engine Module ECU Kit A6421501230 Key Lock

Product currently unavailable

Part no. A0025424019

Mercedes W906 W907 Cut Off Electric Relay Module Wiring Cable A0025424019

Product currently unavailable

Part no. A2048600305

Mercedes W204 Air Module Rear Left N/S Door SRS Control Unit A2048600305

Product currently unavailable

Part no. A2709002100-7

Mercedes W176 A200 BlueEFFICIENCY 270.910 156HP Engine ECU Module A2709002100

Product currently unavailable

Part no. A2129005201

Mercedes W212 Estate Fuse Box Rear Relay Control Unit Module SAM A2129005201

Product currently unavailable

Part no. A2118704626

Driver Seat ECU Mercedes W203 A209 W211 Memory Control Unit Module A2118704626

Product currently unavailable

Part no. A9079002404-1

Mercedes Sprinter W907 W910 Electronic Ignition Module Control Unit A9079002404

Product currently unavailable

Part no. A2319067400

Mercedes R231 Headlight LED Control Module Headlamp Unit A2319067400

Product currently unavailable

Part no. A6511500126-1

Mercedes W204 C200CDI BlueEFFICIENCY OM651.913 Engine ECU Kit A6511500126 Key

Product currently unavailable

Part no. A2078201989

Mercedes-Benz W207 A207 Radio Aerial Antenna Amplifier Module Unit A2078201989

Product currently unavailable

Part no. A6519009702-1

Mercedes W176 A200 CDI OM651.930 136HP Engine ECU Kit A6519009702 2 Keys Lock

Product currently unavailable

Part no. A2319067300

Mercedes R231 Headlight LED Control Module Headlamp Adjust Unit A2319067300

Product currently unavailable

Part no. A2229003011

Mercedes GLC C253 X253 Camera Lane Assist Control ECU Module Unit A2229003011

Product currently unavailable

Part no. A9070005999

Mercedes Sprinter W910 Door Wiring Loom Cable Harness A9070005999

Product currently unavailable

Part no. A2721533779

Mercedes C219 CLS350 M272.964 272HP Engine Module Unit ECU A2721533779 Automatic

Product currently unavailable

Part no. A1644400837

Mercedes W164 Parking Sensor Wiring Loom Cable Harness Front PDC A1644400837

Product currently unavailable

Part no. A6081550035

Mercedes W177 Alternator Mounting Bracket Carrier A6081550035

Product currently unavailable

Part no. A6429007401

Mercedes W213 E350 OM642.855 Diesel Engine Unit ECU A6429007401 Automatic

Product currently unavailable

Part no. rhd-A2055400436

Door Wiring Mercedes C205 Front Right O/S Door Harness Loom A2055400436

Product currently unavailable

Part no. A2129063001-1

Radio Head Unit Mercedes W212 Command Navi CD DVD Player Navigation A2129063001m

Product currently unavailable

Part no. RHD-A2135405392

Display Screen Mercedes W213 C238 Instrument Cluster Speedo Meter A2135405392

Product currently unavailable

Part no. A6229000700

Mercedes W447 Bosch Glow Plug Relay Controller Unit Control Module A6229000700

Product currently unavailable

Part no. A2709000900-1

Mercedes W176 A 180 270.910 122HP Blue Efficiency ECU Kit A2709000900 Key Lock

Product currently unavailable

Part no. A0255454732

Brake Module Mercedes R170 W202 Brake Power Assist BAS Control Unit A0255454732

Product currently unavailable

Part no. A2661539779

Mercedes W169 B150 M266.920 Engine Control Unit ECU A2661539779 Automatic

Product currently unavailable

Part no. A2711502779

Mercedes W204 C180 Kompressor M271 Engine Control Unit Module ECU A2711502779

Product currently unavailable

Part no. A6549009400-2

Mercedes W907 315CDI OM654.920 Engine Unit Module ECU Kit A6549009400 Keys

Product currently unavailable

Part no. A2075401650

Mercedes W204 Fuse Prefuse Box Relay Electrical Control Unit A2075401650

Product currently unavailable

Part no. A6549008000-1

Mercedes Vito W447 OM654.920 114 CDI 136HP Engine ECU Kit A6549008000 Key Lock

Product currently unavailable

Part no. A1175403601

Mercedes C117 Front Bumper Parking Sensor Wiring Loom Cable Harness A1175403601

Product currently unavailable

Part no. A0035422519

Mercedes-Benz A B Class W169 W245 Battery Relay Module Unit A0035422519

Product currently unavailable

Part no. A2129007313

Mercedes W212 CD Player Audio Stereo Radio Head Unit A2129007313

Product currently unavailable

Part no. A0009829308

Mercedes W212 W218 12Ah 200A Auxiliary Additional Generator Battery A0009829308

Product currently unavailable

Part no. A2711536091-1

Mercedes R171 SLK 200 M271.954 Engine Control Unit ECU Kit A2711536091 Key Lock

Product currently unavailable

Part no. A9068200086

Head Unit Mercedes Sprinter W906 Radio Cd Player Unit A9068200086

Product currently unavailable

Part no. A2129001901

Mercedes W212 Towing Hitch Trailer Hook Module Control Unit A2129001901

Product currently unavailable

Part no. A2059060195

Mercedes W205 Front Seat Backrest Heating Mat Element A2059060195

Product currently unavailable

Part no. A4479007906

Mercedes W447 Door Module Front Left Control Unit A4479007906

Product currently unavailable

Part no. A2214302449

Mercedes W221 Parking EPB Hand Brake Actuator Module Control Unit A2214302449

Product currently unavailable

Part no. A9069003602

Mercedes W906 Sam Control Module Fuse Box Unit A9069003602

Product currently unavailable

Part no. A0009004601

Mercedes-Benz S W221 Distronic Radar Sensor Control Unit Module A0009004601

Product currently unavailable

Part no. A6519002803-2

Mercedes W447 114 CDI OM651.950 Engine Control Unit ECU Kit A6519002803 Keys

Product currently unavailable

Part no. 5WK4842

Mercedes W220 Door Central Locking Handle Infrared Proximity Sensor 5WK4842

Product currently unavailable

Radio Player Mercedes W204 COMAND Navi CD Head Unit A2048700196

-20%

Part no. A2048700196-2

Radio Player Mercedes W204 COMAND Navi CD Head Unit A2048700196

Product currently unavailable

Part no. A2115455232

Mercedes W211 Front Fuse Box SAM SRB Module Relay Control Unit A2115455232

Product currently unavailable

Part no. A9069820109-1

Mercedes W907 Positive Battery Terminal Cover Cap Trim Red A9069820109

Product currently unavailable

Part no. A2059000441-1

Central Display Mercedes W205 X253 Dashboard Infotainment Screen M A2059000441

Product currently unavailable

Part no. 2523079917

Mercedes W470 Nissan Navara OM699 Diesel Fog Lights Blue Relay Set 2523079917

Product currently unavailable

Part no. A6421507300-1

Mercedes W164 ML300 CDI 642.940 190HP Engine Control ECU A6421507300 Automatic

Product currently unavailable

Part no. A0009007106

Mercedes CLS W218 Engine Control Unit ECU Module A0009007106

Product currently unavailable

Part no. A2079058802-DWM

Roof Antenna Mercedes W204 W212 Diamond White Metallic - 799 A2079058802

Product currently unavailable

Part no. A1635459032

Mercedes ML W163 Body Control Module Unit BCM ECU A1635459032

Product currently unavailable

Part no. A2661536479

Mercedes-Benz W245 B200 Turbo M266 Engine Control ECU A2661536479 Automatic

Product currently unavailable

Part no. A0009004701

Distance Radar Module Mercedes C204 Distronic Control Unit ECU A0009004701

Product currently unavailable

Part no. A2139001610

Mercedes W213 W222 C238 Keyless Go Entry Control Module Unit ECU A2139001610

Product currently unavailable

Part no. A6511501879-4

Mercedes Vito W639 651.940 116 CDI 163HP Engine Module ECU A6511501879 Manual

Product currently unavailable

Part no. A1669005404

Mercedes W166 W246 Door Module Front Right O/S Control Unit ECU A1669005404

Product currently unavailable

Part no. rhd-A2125400324

Fuse Box Mercedes W212 Relay Electrical Storage Module Support A2125400324

Product currently unavailable

Part no. A6429007301-1

Mercedes W218 CLS350CDI BlueTec OM642.852 Diesel 252HP ECU A6429007301 Automatic

Product currently unavailable

Part no. A0195453132

Mercedes SLK R170 W202 W208 ESP Control Unit ABS ASR Module ECU A0195453132

Product currently unavailable

Part no. A6393280030

Mercedes Vito W639 Valve Block Air Suspension Control Unit Module A6393280030

Product currently unavailable

Part no. A2139002207

Air Suspension Module Mercedes W213 C238 Regulation Control Unit ECU A2139002207

Product currently unavailable

Part no. A9064461542

Air Module Mercedes Vito W639 Sprinter W906 Control Unit ECU Sensor A9064461542

Product currently unavailable

Part no. A0028208126

Mercedes W220 Air Module System Control Unit Module ECU SRS A0028208126

Product currently unavailable

Part no. A6394401832

Mercedes W639 Fuse Box Control Unit Module A6394401832

Product currently unavailable

Part no. rhd-A2075400632

Mercedes C207 Head Unit Navigation Display Media Cable A2075400632

Product currently unavailable

Part no. A0018209726

Mercedes-Benz C CLK Class W203 W209 Airbag Control Unit Module ECU A0018209726

Product currently unavailable

Part no. A2139000500

Trunk Module Mercedes S205 Automatic Trunk Lid Closing Control Unit A2139000500

Product currently unavailable

Mercedes W639 116 CDI 651.940 163HP Engine Module ECU Kit A6519009302 Key Lock

-40%

Part no. A6519009302-4

Mercedes W639 116 CDI 651.940 163HP Engine Module ECU Kit A6519009302 Key Lock

Product currently unavailable

Part no. A2139005223

SAM Module Mercedes W213 C238 Control Unit Front ECU A2139005223

Product currently unavailable

Part no. A6079002200-1

Mercedes W176 A180 CDI OM607 Engine Module ECU A6079002200 Keys Lock Automatic

Product currently unavailable

Part no. A0018203126

Mercedes W168 Air Module Belt Locking System Sensor Control Unit Module ECU

Product currently unavailable

Part no. A6121536379

Mercedes ML W163 270 CDI OM612 163HP Engine Control Unit ECU A6121536379 Manual

Product currently unavailable

Part no. A1665405202

Mercedes ML W166 GLE C292 Engine Compartment Fuse Box Right A1665405202

Product currently unavailable

Part no. A1698207226

Door Module Mercedes W169 W245 Front Right O/S Control Unit A1698207226

Product currently unavailable

Part no. A2129060905

Mercedes A207 Rear SAM Module Fuse Box Relay Control Unit A2129060905

Product currently unavailable

Part no. A0009063622

Mercedes W166 W204 R231 Alternator Generator 180A 14V A0009063622

Product currently unavailable

Part no. A1698205089

CD Player Mercedes W169 W245 Radio Nav Navigation Head Unit A1698205089

Product currently unavailable

Part no. A0015455816

Mercedes Vito Viano W639 Automatic Gearbox Control Module Unit A0015455816

Product currently unavailable

Part no. A2205400030

Mercedes-Benz S-Class W220 Battery Lead Cable Positive Pole A2205400030

Product currently unavailable

Part no. A2038201786

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

Product currently unavailable

Part no. A1669009518

Mercedes ML W166 Pneumatic Air Supsension Module Control Unit A1669009518

Product currently unavailable

Part no. A0009001704

Fuel Pump Module Mercedes W176 W204 C207 W212 W246 Control Unit ECU A0009001704

Product currently unavailable

Part no. rhd-A2085450140

Mercedes-Benz C CLK W202 W208 Fuse Box Relay Control Unit Electric A2085450140

Product currently unavailable

Part no. A1718206526

Mercedes SLK R171 Air Module System Control Unit ECU A1718206526

Product currently unavailable

Part no. A0009063701

Mercedes W205 Alternator 14V/200A Valeo Diesel Engine M626 A0009063701

Product currently unavailable

Part no. A2059000241

Head Unit Mercedes W205 Vito W447 W470 Sat Nav Control Unit A2059000241

Product currently unavailable

Part no. A2218704795

Door Module Mercedes W221 Front Door Right O/S Control Module A2218704795

Product currently unavailable

Part no. A2189007605

Mercedes W212 CLS W218 W246 Sound Audio Amplifier Harman Becker A2189007605

Product currently unavailable

Part no. A4479008905

Mercedes W447 Radio CD Player Stereo Navi Media Head Unit A4479008905

Product currently unavailable

Part no. A2118202897

Radio CD Player Mercedes W211 CLS C219 COMAND Navigation Head Unit A2118202897

Product currently unavailable

Part no. A2045421418

Mercedes-Benz A C W169 W204 Battery Negative Earth Cable Wiring A2045421418

Product currently unavailable

Part no. A2055402992

Mercedes W205 Parking Sensor Wiring Rear Bumper PDC Loom Cable A2055402992

Product currently unavailable

...

Showing 4159-4257 of 5467 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