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. A2229005914

Mercedes W205 Rear SAM Module Control Unit A2229005914

Product currently unavailable

Part no. A2139005023

Ignition Switch Mercedes C238 Electronic Anti Theft Control Module A2139005023

Product currently unavailable

Part no. A2098202689

Mercedes CLK W209 Radio CD Player Stereo Audio Head Unit A2098202689

Product currently unavailable

Part no. A2479002516

Mercedes C253 Windscreen Camera Control Unit Module A2479002516

Product currently unavailable

Part no. A6399000800

Mercedes Vito W639 Fuse Box Relay Control Unit Front SAM Module A6399000800

Product currently unavailable

Part no. A1661500033

Mercedes-Benz W168 M166 Engine Wiring Harness Loom Cable A1661500033

Product currently unavailable

Part no. A2115459232

Parktronic Module Mercedes W211 PDC Parking Sensors Control Unit A2115459232

Product currently unavailable

Part no. A2215407545

Mercedes W221 Parking Aid Sensors Control Unit Module A2215407545

Product currently unavailable

Part no. A9069005103

Mercedes Sprinter W906 Radio CD Player Audio Bluetooth Head Unit A9069005103

Product currently unavailable

Part no. A2059007147

Mercedes C205 Control Body Comfort Module Unit ECU A2059007147

Product currently unavailable

Part no. A2125406250

Mercedes-Benz W212 SAM Fuse Prefuse Box Relay Control Unit A2125406250

Product currently unavailable

Part no. A0275455632

ESP Module Mercedes W210 Electronic Stability Program Control Unit A0275455632

Product currently unavailable

Part no. A1645403706

Wiring Mercedes X164 Dashboard Lower Control Panels Switch Harness A1645403706

Product currently unavailable

Part no. A1695450540

Fuse Box Mercedes W169 W245 Electrical Relay Control Unit A1695450540

Product currently unavailable

Part no. A2139007929

Mercedes W213 GLC X253 Hybrid High Voltage Battery Inverter Module A2139007929

Product currently unavailable

Part no. A6399002900

Mercedes Vito W639 Door Module Front Left N/S Control Unit ECU A6399002900

Product currently unavailable

Part no. A2129005000-1

Navigation Screen Mercedes W212 1 Head Unit Sat Nav Center Display A2129005000

Product currently unavailable

Part no. A6549001300

Glow Plug Relay Mercedes W213 C238 Diesel OM654 Preglow Module A6549001300

Product currently unavailable

Part no. A2218708685

Mercedes W221 Telephone Bluetooth Control Module A2218708685

Product currently unavailable

Part no. A0195453132

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

Product currently unavailable

Part no. A2218205375-CS

Mercedes CLK S Class C209 W209 W221 Roof Antenna Shark Radio Silver A2218205375

Product currently unavailable

Part no. A2129009425-1

Mercedes SLK R172 Fuse Box Relay Control Unit SAM Module A2129009425

Product currently unavailable

Part no. A2038703594

Mercedes CL203 CLC Head Unit CD Player Radio Audio Controller Unit A2038703594

Product currently unavailable

Part no. A6421503972-1

Mercedes C219 CLS 320 642.920 224HP Engine Unit ECU Kit A6421503972 Key Lock

Product currently unavailable

Part no. A6519003203-3

Mercedes W906 313 CDI OM651.955 129HP Diesel Engine ECU Kit A6519003203 Manual

Product currently unavailable

Part no. A0009002218

Mercedes C253 Fuel Pump Module Control Unit ECU A0009002218

Product currently unavailable

Part no. A1729004004-1

Mercedes W204 Display Screen Multifunction Navigation Dashboard A1729004004

Product currently unavailable

Part no. A1718200386

Mercedes SLK R171 Stereo Radio CD Player Head Unit A1718200386

Product currently unavailable

Part no. A2319003606

Mercedes R231 Seat Control Unit Module Driver A2319003606

Product currently unavailable

Part no. A0009067900

Alternator Mercedes W204 W212 Diesel Engine OM651 Valeo 180A A0009067900

Product currently unavailable

Part no. A2115459301

Mercedes W211 W219 Fuse Box Rear SAM Module Electrical Fuse Unit A2115459301

Product currently unavailable

Part no. A1729015805

Mercedes SLK R172 Airbag Module SRS Control Unit ECU A1729015805

Product currently unavailable

Part no. A1638200726

Mercedes ML W163 Window Windscreen Rain Light Sensor Module A1638200726

Product currently unavailable

Part no. A1769051600

Mercedes W176 Front Pressure Impact Crash Sensor Unit Module

Product currently unavailable

Part no. A0001139065

Starter Motor Mercedes W204 W212 OM651 Diesel Engine Starter A0001139065

Product currently unavailable

Part no. A1729006613

Mercedes SLK R172 GPS Navigation System Screen Display A1729006613

Product currently unavailable

Part no. A2465402605

Mercedes-Benz A B W176 W246 Engine Temperature Sensor Wiring Cable Harness

Product currently unavailable

Part no. A6511501879

Mercedes W639 OM651.940 113 CDI 136HP Engine Unit Module ECU A6511501879 Manual

Product currently unavailable

Part no. A1728201700

Mercedes W176 W246 USB Interface Multimedia Adapter Connector A1728201700

Product currently unavailable

Part no. A2129009705

Mercedes W204 W212 Fuse Box Relay Control Unit Electric SAM Module A2129009705

Product currently unavailable

Part no. A2079010600

Rain Sensor Mercedes W204 W212 Light Solar Condensation Control Unit A2079010600

Product currently unavailable

Part no. A2059001311

Mercedes W205 Door Module Front Left N/S Control Unit ECU A2059001311

Product currently unavailable

Part no. A1645450216

Mercedes ML W164 PDC Module Parking Distance Control Unit Sensor A1645450216

Product currently unavailable

Part no. A2469008819

Radio Head Unit Mercedes W176 W246 Audio 20 Media Player Navigation A2469008819

Product currently unavailable

Part no. A6519003203-4

Mercedes W906 313 CDI OM651.955 129HP Diesel Engine ECU A6519003203 Manual

Product currently unavailable

Part no. A2741504703

Mercedes W205 W213 Engine Wiring Harness Cable Loom M274 Petrol A2741504703

Product currently unavailable

Part no. 237104376R

Mercedes Citan W415 109 CDI OM607.951 Engine Control Unit ECU 237104376R Manual

Product currently unavailable

Part no. A1729008500-3

Mercedes W166 W204 Display Screen Information Navigation Dashboard A1729008500

Product currently unavailable

Part no. A1695420018-KB

Mercedes W169 Front Bumper Parking Distance Sensor Parktronic Kosmos Black 191

Product currently unavailable

Part no. A2129004830

Mercedes SLK R172 W212 Rear Fuse Box SAM Relay Control Unit Module A2129004830

Product currently unavailable

Part no. A4479001000

Mercedes Vito W447 Air Module Sensor Control Unit ECU A4479001000

Product currently unavailable

Part no. A6519005301-12

Mercedes W212 E220CDI OM651.924 Engine ECU Kit Key Lock Ignition A6519005301

Product currently unavailable

Part no. A2711505533

Mercedes W204 Petrol Engine M271 Engine Wiring Harnes A2711505533

Product currently unavailable

Part no. A9066200131

Mercedes-Benz Sprinter W906 Battery Tray Housing Box Case A9066200131

Product currently unavailable

Part no. A6519009302-5

Mercedes W639 OM651.940 136HP Engine Unit Module ECU Kit A6519009302 Key Manual

Product currently unavailable

Part no. A6398200642

Mercedes Viano Vito W639 Radio Fan Adapter Control Unit Module A6398200642

Product currently unavailable

Part no. A0002704652

Mercedes W907 DSM ISM Gearbox Control Unit Module Cloning Coding A0002704652

Product currently unavailable

Part no. A1648203785

Mercedes ML W164 Front Left Control Unit Module Door A1648203785

Product currently unavailable

Part no. A0009062302-1

Starter Motor Mercedes W639 W906 Diesel Engine A0009062302 0986024530

Product currently unavailable

Part no. A1669009808

Mercedes ML W166 Head Unit Radio Player Sat Nav Tel SD Card Unit A1669009808

Product currently unavailable

Part no. A0009057802

Crash Impact Sensor Mercedes C118 W177 W205 W247 Acceleration Unit A0009057802

Product currently unavailable

Part no. A6071500233

Engine Wiring Mercedes W176 W246 Diesel OM607 Loom Harness Cable A6071500233

Product currently unavailable

Part no. A2114409906

Antenna Wiring Mercedes W211 Rear End Antenna Wiring Harnes A2114409906

Product currently unavailable

Part no. A6079002200-5

Mercedes W176 A180 CDI OM607.951 BE 109HP Engine ECU A6079002200 Manual

Product currently unavailable

Part no. A0009003806

Mercedes W205 Park Parking Assist PDC Distance Control Unit Module A0009003806

Product currently unavailable

Part no. A2661530391-1

Mercedes W169 W245 A150 B150 M266.920 95HP Engine ECU Kit A2661530391 Key Lock

Product currently unavailable

Part no. A0009004436

Mercedes C118 C205 C253 Automatic Gearbox Control Unit Module ECU A0009008324

Product currently unavailable

Part no. A0025428918

Mercedes-Benz C M Class W163 W203 ESP Yaw Rotation Rate Sensor A0025428918

Product currently unavailable

Part no. A2189009003

Mercedes CLS C218 Front Headlight Xenon Ballast Control Module Unit A2189009003

Product currently unavailable

Part no. A1645402305

PDC Wiring Mercedes ML W164 Front Bumper Parking Sensor Loom Cable A1645402305

Product currently unavailable

Part no. A6519064800

Mercedes GLC X253 GLC 220d Diesel OM651 Engine Starter Motor Bosch A6519064800

Product currently unavailable

Part no. A2711535391-3

Mercedes R171 SLK 200K 163HP 271.944 Engine ECU Kit A2711535391 Keys Lock

Product currently unavailable

Part no. A9079000704

Body Control Module Mercedes Sprinter W907 W910 SAM BCM Unit ECU A9079000704

Product currently unavailable

Part no. A1775407932

Mercedes W177 W247 Positive Battery Cable Lead Wire Starter A1775407932

Product currently unavailable

Part no. A2115405332

Mercedes S211 Rear Axle Self Levelling Device Cable A2115405332

Product currently unavailable

Part no. A9068200486

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

Product currently unavailable

Part no. A2189005607

Radio Head Unit Mercedes W207 W212 COMAND Navi CD Player Navigation A2189005607

Product currently unavailable

Part no. A4159066000

Starter Motor Mercedes W415 Citan OM607 OM608 Diesel Engine Starter 233006508R

Product currently unavailable

Part no. A2465402710

Mercedes W176 W246 Emergency Call Switch Roof Wiring Cable Loom A2465402710

Product currently unavailable

Part no. A0018200826

Mercedes SLK R170 W202 W210 Module Control Unit SRS Sensor ECU Bosch A0018200826

Product currently unavailable

Part no. A1679052401

Crash Impact Sensor Mercedes C118 W177 W247 Front Acceleration Unit A1679052401

Product currently unavailable

Part no. A1635422218

Mercedes ML W163 SRS Control Module Sensor Unit Temic A1635422218

Product currently unavailable

Part no. A2539003809

Mercedes W253 Display Screen Monitor Radio Sat Nav Navigation Unit A2539003809

Product currently unavailable

Part no. A0131541002

Mercedes-Benz Vito Viano W639 Alternator Generator Diesel 200A A0131541002

Product currently unavailable

Part no. A2139052403

Mercedes W213 Trunk Tailgate Rear Switch Sensor Module A2229059004

Product currently unavailable

Part no. A2218206689

Mercedes W221 S500 Audio Amplifier Sound System Control Module A2218205289

Product currently unavailable

Part no. A2038201411

Mercedes R171 W203 W211 Phone Adapter Contact Plate Holder Telephone A2038201411

Product currently unavailable

Part no. A1729060205

Mercedes SLK R172 Rear SAM Fuse Relay Box Control Unit Module A1729060205

Product currently unavailable

Part no. A2129003825

Mercedes W204 SAM Module Control Unit Electrical Fuse Box Unit A2129003825

Product currently unavailable

Part no. A2139008409-1

Seat Module Mercedes C238 Front Right Seat Control Unit A2139008409

Product currently unavailable

Part no. A2319003706

Mercedes R231 Control Unit Module Passenger Seat A2319003706

Product currently unavailable

Part no. A2039000100-1

Head Unit Mercedes CL203 CLC CD Player Radio Audio Telephone Unit A2039000100

Product currently unavailable

Part no. A2139008828

Air Module Mercedes W213 C238 C253 Control Unit ECU A2139008828

Product currently unavailable

Part no. A2124403758

Mercedes W212 Front Bumper PDC Wiring Parking Sensor Loom Harness A2124403758

Product currently unavailable

Part no. A6111537779-1

Mercedes W203 C220CDI OM611.692 116HP Engine Unit ECU Kit A6111537779 Key Lock

Product currently unavailable

Part no. A2049060105-1

Mercedes W204 SAM Control Unit Module Fuse Box Relay Rear A2049060105

Product currently unavailable

Part no. A2719000600

Mercedes W203 C180 Kompressor M271.946 Engine Control Unit ECU A2719000600

Product currently unavailable

Part no. A2115455301

Fuse Box Mercedes W211 Rear Trunk Module Relay Fuse Box SAM A2115455301

Product currently unavailable

Part no. A6461536579

Mercedes-Benz W203 W210 Sprinter W906 Glow Plug Relay A6461536579

Product currently unavailable

...

Showing 2179-2277 of 3361 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