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. A2711502933

Engine Wiring Harness Mercedes R171 W203 C209 M271 Loom Cable A2711502933

Product currently unavailable

Part no. 1368035080

Battery Tray Citroen Relay Fiat Ducato Battery Housing Box Tray 1368035080

Product currently unavailable

Part no. A1669008222

Mercedes GLA X156 Central Display Infotainment Sat Nav Media Screen A1669008222

Product currently unavailable

Part no. A0009005109

Mercedes W205 X253 Distronic Radar Sensor Cruise Control Unit Module A0009005109

Product currently unavailable

Part no. A0009068802-3

Alternator Generator Mercedes Sprinter W906 Engine Diesel 180A 14V A0009068802

Product currently unavailable

Part no. A1669002307

Mercedes ML W166 PDC Parking Distance Control Unit Module Sensor A1669002307

Product currently unavailable

Part no. A1645401730

Mercedes W164 Battery Starter Alternator Wiring Harness Cable OM642 A1645401730

Product currently unavailable

Part no. A0255453332

Mercedes W202 W210 Engine Cooling Radiator Fan Control Unit Module

Product currently unavailable

Part no. A2086900028

Mercedes-Benz W202 C208 Roof Alarm Motion Sensor Cover Trim Grey A2086900028

Product currently unavailable

Part no. A2195404505

Mercedes C219 Coupe Front Bumper Parking Sensor PDC Wiring Harness A2195404505

Product currently unavailable

Part no. A2118705390

Mercedes ML W164 SLK R171 W211 C219 CD Changer 6 Disc Player Unit A2118705390

Product currently unavailable

Part no. A2118704726

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

Product currently unavailable

Part no. A0131541002

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

Product currently unavailable

Part no. A2218208789

Mercedes W221 Audio Sound Speakers Amplifier Control Unit ECU A2219008103

Product currently unavailable

Part no. A6461540002

Mercedes Sprinter W906 OM646 Engine Diesel Alternator Generator A6461540002

Product currently unavailable

Part no. A2054403008

Mercedes W205 X253 Wiring Cable Harness Center Console A2054403008

Product currently unavailable

Part no. A0009068802-1

Mercedes Sprinter W906 Alternator Generator Diesel 180A 14V A0009068802

Product currently unavailable

Part no. A1718200786

Mercedes SLK R171 Stereo Radio CD Player Head Unit A1718200786

Product currently unavailable

Part no. A2108205710

Mercedes-Benz C E Class W202 W203 W210 Windscreen Rain Light Sensor A2108205710

Product currently unavailable

Part no. A0001502550

Mercedes ML W163 Alternator Generator A0001502550

Product currently unavailable

Part no. A1669005420

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

Product currently unavailable

Part no. A2079003700

Mercedes C207 Door Module Rear Left N/S Control Unit ECU A2079003700

Product currently unavailable

Part no. A2469008510

Body Control Module Mercedes W117 W176 W242 W246 Fuse Box Sam A2469008510

Product currently unavailable

Part no. A6401507934

Mercedes W169 W245 A180 B180 CDI Engine Control Module A6401507934 Automatic

Product currently unavailable

Part no. A2129003708

Mercedes W212 COMAND Radio Head Unit Navi CD DVD Player Navigation A2129003708

Product currently unavailable

Part no. A6519009402-1

Mercedes W245 B200 CDI Blue Efficiency OM651.901 136HP ECU Kit A6519009402 Key

Product currently unavailable

Part no. A2649060400

Mercedes W205 W257 Starter Engine Motor A2649060400

Product currently unavailable

Part no. A6519009702-2

Mercedes H243 EQA350 780.200 4-Matic Engine Unit ECU A6519009702 Automatic

Product currently unavailable

Part no. A2059000628

Door Module Mercedes W205 Front Right O/S Door Control Module Unit A2059000628

Product currently unavailable

Part no. A6421500856

Mercedes W164 Diesel OM642 Engine Wiring Loom Harness Cable A6421500856

Product currently unavailable

Part no. A6110920140

Mercedes-Benz M-Class ML W163 Fuel Pump Bracket Holder Housing A6110920140

Product currently unavailable

Part no. A1669003501

Mercedes W166 Switch Rotary Selector Controller Navigation Radio A1669003501

Product currently unavailable

Part no. A1699002500

Mercedes W169 W245 W639 W906 Head Unit Radio Media Player Navigation A1699002500

Product currently unavailable

Part no. A0009001803

Mercedes W176 W204 C207 C218 W246 Fuel Pump Control Module A0009001803

Product currently unavailable

Part no. A2059005351

Mercedes GLC X253 Electronic Module ECU Control Unit A2059005351

Product currently unavailable

Mercedes W221 Door Module Rear Door Control ECU Unit Left N/S A2218704895

-15%

Part no. A2218704895

Mercedes W221 Door Module Rear Door Control ECU Unit Left N/S A2218704895

Product currently unavailable

Part no. a1699007900

Mercedes W169 W639 COMAND Navigation Head Unit Radio Sat Nav Screen A1699007900

Product currently unavailable

Part no. A1769009203

Mercedes R172 R231 Headlight LED Ballast Control Unit Module A1769009203

Product currently unavailable

Part no. A2049060205

Mercedes W204 Rear SAM Module Fuse Box Relay Control Unit A2049060205

Product currently unavailable

Part no. A2115457301

Mercedes C219 Front Fuse Box SAM Relay Control Module A2115457301

Product currently unavailable

Part no. A6429002700

Mercedes W203 W204 W212 OM642 Glow Plug Relay Unit Control Module A6429002700

Product currently unavailable

Part no. A4479009509-1

Mercedes W447 Comfort Control Unit Module A4479009509

Product currently unavailable

Part no. A2129008307

Mercedes W212 Fuse Box Control Unit Module SAM Relay Box A2129008307

Product currently unavailable

Part no. A0061514601

Starter Motor Mercedes Sprinter W203 W204 W211 OM646 Diesel Engine A0061514601

Product currently unavailable

Part no. A2469003818

Mercedes W176 W246 Radio Head Unit COMAND Navi Player Control Unit A2469003818

Product currently unavailable

Part no. A4475460064

Mercedes W447 Fuse Box Module Cover Trim Trunk A4475460064

Product currently unavailable

Part no. A2048708926

Mercedes S204 Bootlid Control Unit Trunk Lid Module A2048708926

Product currently unavailable

Part no. A2469000012-1

Mercedes W176 W246 Radio Head Unit COMAND Navi Player Control Unit A2469000012

Product currently unavailable

Part no. A4159066000

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

Product currently unavailable

Part no. A4479050004

Mercedes Vito W447 Negative Battery IBS Cable Wiring A4479050004

Product currently unavailable

Part no. A1649004101

Mercedes ML W164 Passenger Side Control Unit Module Fuse Box SAM A1649004101

Product currently unavailable

Part no. A1669006020

Mercedes W166 Front SAM BCM Control Unit Module CBC V4 ECU A1669006020

Product currently unavailable

Part no. A2059006413

Door Module W205 Rear Right O/S Door Control Unit Module ECU A2059006413

Product currently unavailable

Part no. A6395450191

Mercedes Vito W639 Positive Battery Terminal Cover Cap Trim Red A6395450191

Product currently unavailable

Part no. A9100005999

Mercedes Sprinter W910 Cable Wiring Loom Harnesses A9100005999

Product currently unavailable

Part no. A0009002720

Mercedes Sprinter W907 Parking Control Unit Module Sensor Parktronic A0009002720

Product currently unavailable

Part no. A2038704589

Mercedes W203 CD Media Player Radio Audio 20 Phone Head Unit A2038704589

Product currently unavailable

Part no. A1695420518

Mercedes-Benz B W245 Front Bumper Parking Distance Sensor Parktronic Primed

Product currently unavailable

Part no. A1725400950

Mercedes SLK R172 Relay Fuse Box Control Unit A1725400950

Product currently unavailable

Part no. A2129009025

Mercedes W212 Fuse Box Front Relay Control Unit Module SAM A2129009025

Product currently unavailable

Part no. A1688207310

Mercedes-Benz A-Class W168 Sensor Mat Seat Occupation Recognition A1688207310

Product currently unavailable

Part no. A6511500186

Mercedes W212 Engine Wiring Harness Cable Loom A6511500186

Product currently unavailable

Part no. A2049067702

Mercedes W204 Fuse Box Rear SAM Module Electrical Fuse Unit A2049067702

Product currently unavailable

Part no. A6079002300-4

Mercedes W176 180 CDI OM607 Engine Control Unit Module ECU 237101754R Automatic

Product currently unavailable

Part no. A1635454032

Mercedes W163 ECU Start Engine Control Unit Immobilizer Ring A1635454032

Product currently unavailable

Part no. A2038701689

Mercedes CL203 Antenna Amplifier Control Module Unit Aerial Booster A2038701689

Product currently unavailable

Part no. A2215403050

Mercedes W221 Rear SAM Fuse Box Power Distribution Control Unit A2215403050

Product currently unavailable

Part no. A2059002211

Display Mercedes C205 Dashboard Central Multimedia Car System Screen A2059002211

Product currently unavailable

Part no. A2129003608

Air Suspension Module Mercedes W212 Regulation Level Control Unit A2129003608

Product currently unavailable

Part no. A9079000305

Mercedes Sprinter W907 W910 Body Control Module BCM V2 ECU A9079000305

Product currently unavailable

Part no. A2129004603

Mercedes-Benz W221 Distronic Intelligent Cruise Control Radar Unit A2129004603

Product currently unavailable

Part no. A2049004306

Mercedes W204 Navigation CD Player COMAND Radio Sat Nav Head Unit A2049004306

Product currently unavailable

Wiring Harness Mercedes W246 M270 Petrol Engine Wiring Harness Loom A2701506733

-40%

Part no. A2701506733

Wiring Harness Mercedes W246 M270 Petrol Engine Wiring Harness Loom A2701506733

Product currently unavailable

Part no. A2719000600

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

Product currently unavailable

Part no. A6519003403-2

Mercedes W906 314CDI OM651.955 143HP Engine Unit Module ECU Kit A6519003403

Product currently unavailable

Part no. A0015455716

Mercedes Vito W639 Automatic Gearbox EGS Control Unit Module ECU A0015455716

Product currently unavailable

Part no. A2129000829

Mercedes W207 W212 Head Unit Sat Nav Navigation Display Screen

Product currently unavailable

Part no. A2055402324

Mercedes W205 Center Console Ambient Lighting Light Wiring Harness A2055402324

Product currently unavailable

Part no. A2085403508

Mercedes-Benz W202 C208 W208 Parking Sensor Wiring Cable Rear PDC A2085403508

Product currently unavailable

Part no. A2669001000

Mercedes-Benz W169 W245 Start Stop Starter Alternator Module ECU A2669001000

Product currently unavailable

Part no. A0061512501-1

Mercedes-Benz C-Class W203 W204 W211 Diesel Engine Starter Motor A0061512501

Product currently unavailable

Part no. A1729008412

Mercedes SLK R172 Roadster Folding Vario Roof Control Module A1729008412

Product currently unavailable

Part no. A1635400182

Mercedes-Benz ML-Class W163 Fuse Box Lid Cover Box Trim A1635400182

Product currently unavailable

Part no. A6461503278

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

Product currently unavailable

Part no. A9079000806

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

Product currently unavailable

Part no. A1708200386

Mercedes-Benz A E M Class W163 W168 W210 CD Player Audio 10 Stereo Radio Unit

Product currently unavailable

Part no. A2045453901

Mercedes W204 Fuse Box Relay Control Unit Electric Module SAM A2045453901

Product currently unavailable

Part no. A4479000101

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

Product currently unavailable

Part no. A2098200085

Mercedes W209 Convertible Air Module SRS Control Unit ECU A2098200085

Product currently unavailable

Part no. A2661531491

Mercedes W169 A150 M266.920 95HP Engine Control Unit ECU A2661531491 Automatic

Product currently unavailable

Part no. A2028001448

Mercedes W202 Central Locking Vacuum Pump Control Unit A2028001448

Product currently unavailable

Part no. A2749000800-3

Mercedes W205 C200 274.920 184HP Engine Control Unit ECU A2749000800

Product currently unavailable

Part no. A1645407901

Mercedes V251 Gateway Module Control Unit ECU A1645407901

Product currently unavailable

Part no. A6461500400

Mercedes Vito W639 OM646.980 111 CDI 116HP Engine ECU Module A6461500400 Manual

Product currently unavailable

Part no. A4475405931

Mercedes Vito W447 Fuse Relay Box Module A4475405931

Product currently unavailable

Part no. A1638200726

Mercedes ML W163 Window Windscreen Rain Light Sensor Module A1638200726

Product currently unavailable

Part no. A6519007003

Mercedes W176 A200 CDI OM651 136HP Engine Module ECU Unit A6519007003 Automatic

Product currently unavailable

Part no. A9065403815

Mercedes Sprinter W906 OM651 Battery Wiring Harness Loom Cable A9065403815

Product currently unavailable

Part no. A1669008512

Mercedes GLE 250 AM Tailgate Trunk Control Module Unit A1669008512

Product currently unavailable

...

Showing 2080-2178 of 3382 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