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. A2118701585

Rain Sensor Mercedes W211 W219 Windscreen Control Unit Module A2118701585

Product currently unavailable

Part no. A2045421418

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

Product currently unavailable

Part no. A0175450632

Mercedes C140 Gearbox Module Transmission Basic Control Unit A0175450632

Product currently unavailable

Part no. A2469000709

Mercedes W246 Air Module Control Unit ECU Module A2469000709

Product currently unavailable

Part no. A6291501933

Mercedes W164 OM629 Diesel Engine Motor Wiring Loom Cable Harness A6291501933

Product currently unavailable

Part no. A0009050410

Mercedes W176 W205 C207 W212 Front Radar Distance Sensor Unit Module A0009050410

Product currently unavailable

Part no. A1775405710

Parking Sensor Wiring Mercedes W177 W247 Rear Bumper PDC Loom Cable A1775405710

Product currently unavailable

Part no. A2479061803

Mercedes W177 W247 Battery Fuse Box Positive Distribution Terminal A2479061803

Product currently unavailable

Part no. A2515454132

Mercedes W164 W251 Air Suspension Level Control Unit Module Airmatic A2515454132

Product currently unavailable

Part no. A1699000400

Door Module Mercedes W169 W245 Control Unit Front Right O/S A1699000400

Product currently unavailable

Part no. A0061514501-2

Starter Motor Mercedes W204 W212 Sprinter W906 OM651 Diesel Engine A0061514501

Product currently unavailable

Part no. A1698204185

Mercedes A B Class W169 W245 Airbag System Control Unit Module ECU A1698204185

Product currently unavailable

Part no. A2035453801-1

Mercedes W203 W209 Fuse Box Rear SAM Module Relay Control Unit A2035453801

Product currently unavailable

Part no. A6429002900-7

Mercedes W204 C350 CDI OM642.830 Engine Module ECU Kit A6429002900 Key + Lock

Product currently unavailable

Part no. A0009060086

Mercedes W205 Control Unit Power Distribution Box Electrical A0009060086

Product currently unavailable

Part no. A0075451432

ECU Mercedes W124 E280 M103.940 Engine Control Unit Automatic Jetronic

Product currently unavailable

Part no. A1679008812

Seat Module Mercedes W167 W177 W247 Control Unit ECU A1679008812

Product currently unavailable

Part no. A0055421918

Yaw Module Mercedes W204 Rotation Rate Acceleration Sensor A0055421918

Product currently unavailable

Part no. A2128700194

Mercedes W204 W212 C218 Sound Audio Amplifier Harman Becker A2128700194

Product currently unavailable

Part no. A2215402862

Mercedes W221 Fuse Box Front SAM Module Relay Control Unit A2215402862

Product currently unavailable

Part no. A6519060000

Starter Motor Mercedes W639 W906 OM651 Engine Diesel Bosch A6519060000

Product currently unavailable

Part no. A2118210097

Mercedes E-Class W211 Front Door Wiring Loom Harness Rubber Grommet A2118210097

Product currently unavailable

Part no. A6541599500

Mercedes C253 OM654 Engine Wiring Cable Cover Duct Bracket Channel A6541599500

Product currently unavailable

Part no. A2129008007

Mercedes W204 SAM Module Fuse Box Relay Control Unit A2129008007

Product currently unavailable

Part no. A9015407309

Mercedes W901 OM602 Ignition Lead Electrical Cable Harness A9015407309

Product currently unavailable

Part no. A2465403505

Door Wiring Mercedes W176 W246 Front Passenger Side Cable Harness A2465403505

Product currently unavailable

Part no. A6511501879-5

Mercedes Vito W639 2.2 CDI 651.940 4-Matic ECU Kit Engine A6511501879 Key Lock

Product currently unavailable

Part no. A0019822708

Mercedes ML W166 C216 W221 Auxiliary Additional Generator Battery A0019822708

Product currently unavailable

Part no. a4479050104

Earth Ground Cable Mercedes Vito W447 Negative Battery Lead Wiring A4479050104

Product currently unavailable

Part no. A0035422519

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

Product currently unavailable

Part no. A9079008805

Mercedes Sprinter W907 W910 Head Unit Multimedia Controller Module A9079008805

Product currently unavailable

Part no. A2479061803-1

Mercedes W177 W247 Battery Fuse Box Positive Distribution Terminal A2479061803

Product currently unavailable

Part no. A6519062400

Starter Motor Mercedes W204 W212 OM651 Diesel Engine Bosch Starter A6519062400

Product currently unavailable

Part no. A0165459632

Mercedes C140 W202 Engine Cooling Radiator Fan Control Unit Module A0165459632

Product currently unavailable

Part no. A1685453532

Mercedes W168 ESP + HBA Electronic Stability Program Control Module A1685453532

Product currently unavailable

Part no. A2118203297

Mercedes W211 W219 Radio CD Player COMAND Sat Navigation Head Unit A2118203297

Product currently unavailable

Part no. A9079000806

Mercedes Sprinter W907 W910 Front SAM Body Control Module Unit ECU A9079000806

Product currently unavailable

Part no. A2118705426

Rain Sensor Mercedes W211 C219 Front Windscreen Control Unit A2118705426

Product currently unavailable

Part no. A2909064100

Exhaust Flap Actuator Mercedes W205 W213 C253 Control Unit Right O/S A2909064100

Product currently unavailable

Part no. A2661540902

Alternator Generator Mercedes W169 W245 Engine 115A 14V A2661540902

Product currently unavailable

Part no. A1679008405

Mercedes Sprinter W907 W910 Front Door Module Control Unit Left N/S A1679008405

Product currently unavailable

Part no. A1645450201

Fuse Box Mercedes ML W164 W251 OM642 Diesel Relay Module Unit A1645450201

Product currently unavailable

Part no. A6401502433

Engine Wiring Mercedes W169 W245 OM640 Cable Loom Harness A6401502433

Product currently unavailable

Part no. A1765400009

Negative Cable Mercedes C117 W176 Battery Lead Minus Pole Wiring A1765400009

Product currently unavailable

Part no. A2129004008

Mercedes C207 Stereo Radio CD Player Head Unit A2129004008

Product currently unavailable

Part no. A2465403803

Mercedes-Benz A-Class W176 Cover Equipment Electrical Fuse Box A2465403803

Product currently unavailable

Part no. A0055421818

Mercedes W204 Yaw Rotation Rate Acceleration Sensor Module A0055421818

Product currently unavailable

Part no. A0185458332

Mercedes C140 Body Control Comfort Unit Module BCM Unit ECU A0185458332

Product currently unavailable

Part no. A2129068800

Radio Head Unit Mercedes W212 COMAND Navi CD DVD Player Control Unit A2129068800

Product currently unavailable

Part no. A2711500391-9

Mercedes R172 BlueEFFICIENCY 271.861 184HP Engine ECU Kit A2711500391 Key + Lock

Product currently unavailable

Part no. A2469005010

Mercedes W176 W246 Parktronic Parking Control Unit Module ECU A2469005010

Product currently unavailable

Part no. A2059004113-1

Mercedes S205 Display Screen Multimedia Navigation Sat Head Unit A2059004113

Product currently unavailable

Part no. A0065424218

Mercedes Sprinter W906 Turn Rate Sensor Module Control Unit A0065424218

Product currently unavailable

Part no. A1669000213

Mercedes ML W166 Radio Stereo CD Player Audio Sat Nav Head Unit A1669000213

Product currently unavailable

Part no. A6429061000

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

Product currently unavailable

Part no. A2129000004-2

SAM Module Mercedes W212 Fuse Box Relay Control Unit A2129000004

Product currently unavailable

Part no. A2649001200-4

Mercedes W177 A35 AMG 306HP 260.920 4Matic Engine ECU Control Unit A2649001200

Product currently unavailable

Part no. A1695420518-KB

Mercedes-Benz W245 Front Bumper Parking Distance Sensor Parktronic Kosmos Black

Product currently unavailable

Part no. A0051516601

Starter Motor Mercedes W203 W209 W211 W906 Engine Diesel A0051516601

Product currently unavailable

Part no. A2115456101

Mercedes W211 SAM Module Fuse Box Relay Control Unit A2115456101

Product currently unavailable

Part no. A2126280041

Mercedes W212 Battery Holder Mount Bracket E-Class A2126280041

Product currently unavailable

Part no. A2118702489

Audio Amplifier Mercedes W211 Audio Gateway Control Unit Module A2118702489

Product currently unavailable

Part no. A2711540902

Alternator Generator Mercedes W203 W209 M271 Engine Valeo 120A 14V A2711540902

Product currently unavailable

Part no. A2035450403

Mercedes-Benz C CLK Class W203 C209 Fuse Box Cover Engine A2035450403

Product currently unavailable

Part no. A0051510601

Starter Motor Mercedes W163 R170 W210 W901 Diesel Engine Actuator A0051510601

Product currently unavailable

Part no. A9062700060

Mercedes Sprinter W906 Mechatronic Automatic Gearbox Control Unit A9062700060

Product currently unavailable

Part no. A4159064900-1

Mercedes Citan W415 Alternator Generator OM607 Diesel Engine 150A 14V 231000026R

Product currently unavailable

Part no. A6511501879-7

Mercedes Vito W639 OM651.940 136HP 113 CDI Engine ECU Kit A6511501879 Keys+Lock

Product currently unavailable

Part no. A2115401805

Battery Cable Mercedes W211 OM647 Starter Alternator Wiring Harness A2115401805

Product currently unavailable

Part no. A0009052702

Mercedes W169 W204 W212 Battery Cable Negative Lead Wiring Harness A0009052702

Product currently unavailable

Part no. A6461503278

Mercedes Vito W639 OM646.982 109HP Engine Module ECU Unit A6461503278 Manual

Product currently unavailable

Part no. A0014460340-1

Mercedes W169 A150 M266.920 95HP Engine Control ECU Kit A0014460340 Automatic

Product currently unavailable

Part no. A2059000044

Mercedes C205 Midline Sound Audio Amplifier Unit A2059000044

Product currently unavailable

Part no. A2129005712

Mercedes W204 Front Fuse Box Relay Module Sam Control A2129005712

Product currently unavailable

Part no. A0325453832

Module Mercedes W639 Automatic Transmission Control Module Unit A0325453832

Product currently unavailable

Part no. A4475404326

Mercedes Vito W447 Fuse Relay Box Control Module A4475404326

Product currently unavailable

Part no. A6421508900-8

Mercedes W221 S350 BlueTEC OM642.862 Engine ECU Kit Ignition + Key A6421508900

Product currently unavailable

Part no. A0131545902

Alternator Generator Mercedes W211 S211 OM646 Diesel Engine 200A A0131545902

Product currently unavailable

Part no. A1698206726

Mercedes-Benz W245 ECU Control Unit Sensor Module Airbag A1698206726

Product currently unavailable

Part no. A4479000101

Door Module Mercedes Vito W447 Rear Right O/S Door Control Unit A4479000101

Product currently unavailable

Part no. A9065410740

Mercedes Sprinter W906 Battery Cover Frame Bracket Mount Holder A9065410740

Product currently unavailable

Part no. A2078210411

Mercedes W204 W207 Centre Console Connector AUX USB Port Socket Trim A2078210411

Product currently unavailable

Part no. A0131541002-1

Mercedes Vito Viano W639 Alternator Generator Diesel 200A A0131541002

Product currently unavailable

Part no. A2055402324

Mercedes W205 Center Console Ambient Lighting Light Wiring Harness A2055402324

Product currently unavailable

Part no. A6397600604

Mercedes-Benz Vito W639 Front Left Door N/S Lock Bowden Pull Cable A6397600604

Product currently unavailable

Part no. A2129005010

Mercedes W212 Audio 20 CD Player Audio Stereo Radio Head Unit A2129005010

Product currently unavailable

Part no. A2049014504

Rain Sensor Mercedes W204 W212 Windscreen Control Unit A2049014504

Product currently unavailable

Part no. A6429007201

AdBlue Module Mercedes W166 Diesel OM642 Exhaust Gas Cleaning Unit A6429007201

Product currently unavailable

Part no. A1718200386-1

Mercedes SLK R171 Stereo Radio CD Player Head Unit A1718200386

Product currently unavailable

Part no. A6395460035

Mercedes Vito W447 W639 Battery Terminal Protection Cap Cover A6395460035

Product currently unavailable

Part no. A1665420018

Battery Cable Mercedes W176 Negative Lead Wiring Harness Control A1665420018

Product currently unavailable

Part no. A1728100011-1

Navigation Processor Mercedes W176 W212 Control Unit Module NTG 4.5 A1728100011

Product currently unavailable

Part no. A1769001101

Mercedes W176 W246 Comfort Module Central Gateway Control Unit VST A1769001101

Product currently unavailable

Part no. A2124401251

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

Product currently unavailable

Part no. A9069001203

Mercedes Sprinter W906 Radio Player Stereo Audio Head Unit A9069001203

Product currently unavailable

Part no. A1408205126

Mercedes W140 Electric Seat Adjustment Control Unit Module ECU A1408205126

Product currently unavailable

Part no. A2219007301

Mercedes W221 Front Door Control Left N/S Module Unit ECU A2219007301

Product currently unavailable

Part no. A1645402372

Mercedes W164 W251 Fuse Relay Module Rear Fuse Box Unit A1645402372

Product currently unavailable

Part no. A2129006709

Head Unit Mercedes C207 W212 High Line Radio Sat Nav DVD Bluetooth A2129006709

Product currently unavailable

...

Showing 2872-2970 of 3281 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