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. A1719010100

Mercedes SLK R171 Heated Heating Seat Control Unit Module A1718201626

Product currently unavailable

Part no. A2711504279

Mercedes W204 C180 156HP Kompressor M271.910 Engine ECU A2711504279 Manual

Product currently unavailable

Part no. A2118203297

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

Product currently unavailable

Part no. A1669007616

Amplifier DAB Mercedes W176 W204 W212 Control Unit Module ECU A1669007616

Product currently unavailable

Part no. A0034464110

Mercedes W203 W204 W211 Automatic Gearbox Transmission Control Unit A0034464110

Product currently unavailable

Part no. lhd-A2215401250

Mercedes W221 Prefuse Fuse Distribution Box Unit Front A2215401250

Product currently unavailable

Part no. A2115459232

Parktronic Module Mercedes W211 PDC Parking Sensors Control Unit A2115459232

Product currently unavailable

Part no. A9065400113

Mercedes-Benz Sprinter W906 Rear Door Licence Plate Lighting Wiring Cable

Product currently unavailable

Part no. A9065402727

Mercedes Sprinter W906 OM651 Engine Wiring Harness Cable Loom A9065402727

Product currently unavailable

Part no. A2139007929

Mercedes W213 GLC X253 Hybrid High Voltage Battery Inverter Module A2139007929

Product currently unavailable

Part no. A2125452640

Mercedes W212 Control Unit Module Bracket Holder Mount A2125452640

Product currently unavailable

Part no. A6519003403-4

Mercedes Sprinter W906 OM651.955 163HP Engine Unit Module ECU A6519003403 Manual

Product currently unavailable

Part no. A1669000220

Mercedes GLE C292 Coupe Air Control Module Unit Bosch SRS A1669000220

Product currently unavailable

Part no. A1694402805

Mercedes-Benz A B W169 W245 Starter Alternator Battery Lead Cable A1694402805

Product currently unavailable

Part no. A2129006924

Mercedes W207 W212 SAM Module Fuse Box Relay Control Unit A2129006924

Product currently unavailable

Part no. A2048700594

Radio Player Mercedes-Benz W204 COMAND Navi CD Head Unit A2048700594

Product currently unavailable

Part no. A1698206926

Door Module Mercedes W169 W245 Front Left N/S Control Unit A1698206926

Product currently unavailable

Part no. A6399000300-1

Mercedes Vito Viano W639 Side Sliding Door Control Unit Module ECU A6399000300

Product currently unavailable

Part no. A2139063605

SD Card Mercedes W205 C238 Garmin Map Pilot Navigation Europe A2139063605

Product currently unavailable

Part no. A2711504879

Mercedes W204 C180 Kompressor 271.952 156HP Engine Control Unit ECU A2711504879

Product currently unavailable

Part no. A2701501433

Engine Wiring Mercedes W176 W246 W242 M270 Loom Harness Cable A2701501433

Product currently unavailable

Part no. A2098204189

Mercedes-Benz CLK-Class C209 W209 Aerial Antenna Amplifier Unit A2098204189

Product currently unavailable

Part no. A0005456916

Mercedes W212 CDI Automatic Gearbox Control Module Unit ECU A0005456916

Product currently unavailable

Part no. A6079002000-1

Mercedes W176 A180 CDI 607.951 109HP Engine ECU Kit A6079002000 Key Lock Manual

Product currently unavailable

Part no. A2711502779-2

Mercedes W204 C180 156HP Kompressor M271.952 Engine ECU Kit A2711502779 Key

Product currently unavailable

Part no. A2055404106

Brake Harness Mercedes W205 Rear Left Brake Pad Wear Wire Wiring A2055404106

Product currently unavailable

Part no. A2469067901

Mercedes C117 W176 W246 Battery Positive Plus Pole Terminal Lead A2469067901

Product currently unavailable

Part no. A2045842982

Mercedes W204 Fuse Box Grouping Fuse Placement Map Card Diagram A2045842982

Product currently unavailable

Part no. A6519005301-12

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

Product currently unavailable

Part no. A0018276804

Mercedes W207 Connection Media Interface Cable iPod Wiring Lead A0018276804

Product currently unavailable

Part no. A9065452101

Fuse Box Mercedes Sprinter W906 SAM Control Unit Module A9065452101

Product currently unavailable

Part no. A1645405662

Mercedes W164 Central Gateway Control Unit Module A1645405662

Product currently unavailable

Part no. A0009825323

Mercedes GLC X253 Relay Battery Control Cut Off Out Relay A0009825323

Product currently unavailable

Part no. A1699010100-2

Fuse Box Mercedes W169 W245 SAM Body Control Module Unit ECU A1699010100

Product currently unavailable

Part no. A2219008603

Mercedes W221 Door Control Module Unit ECU Front Right O/S A2219008603

Product currently unavailable

Part no. A2049009501

Fuse Box Mercedes W204 Rear SAM Relay Control Unit Module A2049009501

Product currently unavailable

Part no. A6401508334

Mercedes W245 B200 CDI OM640.941 140HP Engine ECU Kit A6401508334 Key

Product currently unavailable

Part no. A1669005517

Mercedes W207 Telematic Communication Control Unit Module A1669005517

Product currently unavailable

Part no. A6421540402-1

Mercedes W164 W204 W211 OM642 Diesel Alternator Generator A6421540402

Product currently unavailable

Part no. A2098205226

Mercedes CLK C209 Rear Body Control Module Unit BCM ECU A2098205226

Product currently unavailable

Part no. a2229004519

Communication Module Mercedes R172 C117 W176 Hermes LTE Control Unit A2229004519

Product currently unavailable

Part no. A1729008612

Mercedes SLK R172 Amplifier Audio Sound Control Unit Module Harman A1729008612

Product currently unavailable

Part no. A0131546802

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

Product currently unavailable

Part no. A2048205015

Mercedes W204 W207 Wiring Loom Cable Harness AUX Jack A2048205015

Product currently unavailable

Part no. A2469002718-1

Radio CD Player Mercedes W176 W246 Audio Navigation Stereo Head Unit A2469002718

Product currently unavailable

Part no. A2218708685

Mercedes W221 Telephone Bluetooth Control Module A2218708685

Product currently unavailable

Part no. A6395400431

Mercedes Vito W639 Earth Cable Battery Terminal Wiring A6395400431

Product currently unavailable

Part no. A6519009402

Mercedes W245 B200 CDI Blue Efficiency OM651.901 Engine Unit ECU A6519009402

Product currently unavailable

Part no. A1635402209

Mercedes-Benz M ML W163 Rear Bumper Parktronic Wiring Loom Harness A1635402209

Product currently unavailable

Part no. A1699002400

Mercedes W169 CD Navi Media Player Radio COMAND Head Unit A1699002400

Product currently unavailable

Part no. A1649004600

Mercedes ML W164 W251 SAM Module Control Unit ECU A1649004600

Product currently unavailable

Part no. A1669006120

Mercedes ML W166 GLE C292 SAM Module Control Unit ECU A1669006120

Product currently unavailable

Part no. A1661500033

Mercedes-Benz W168 M166 Engine Wiring Harness Loom Cable A1661500033

Product currently unavailable

Part no. A1645402972

Mercedes W164 Fuse Box Holder A1645402972

Product currently unavailable

Part no. A6519005203-1

ECU Mercedes C205 C250d Diesel OM651.921 204HP Engine Control Unit Automatic

Product currently unavailable

Part no. A2059007815

Mercedes W205 Radio Audio Navi GPS Head Unit A2059007815

Product currently unavailable

Part no. A9075404687

Mercedes W907 Battery Cable Alternator Wiring Loom Harness Cabling A9075404687

Product currently unavailable

Part no. A6461507272

Mercedes W639 Vito 109 CDI OM646 Engine Unit Module ECU A6461507272 Manual

Product currently unavailable

Part no. A2229001614

Module Mercedes C205 Front Door Right O/S Control Module Unit A2229001614

Product currently unavailable

Part no. A2139052503

Mercedes W167 W177 W205 W213 Trunk Lid Opening Sensor Control Unit A2139052503

Product currently unavailable

Part no. A2114409906

Antenna Wiring Mercedes W211 Rear End Antenna Wiring Harnes A2114409906

Product currently unavailable

Part no. A6395450191

Mercedes Vito W639 Positive Battery Terminal Cover Cap Trim Red A6395450191

Product currently unavailable

Part no. A1715451001

Mercedes SLK R171 Fuse Box SAM Relay Control Unit Module A1715451001

Product currently unavailable

Part no. A6399003100

Mercedes Vito W639 Door Module Front Left N/S Control Unit ECU A6399003100

Product currently unavailable

Part no. A2469009412

Mercedes W176 Head Unit Radio Cd Player Bluetooth Multimedia A2469009412

Product currently unavailable

Part no. A0009062302-1

Starter Motor Mercedes W639 W906 Diesel Engine A0009062302 0986024530

Product currently unavailable

Part no. A1775405710

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

Product currently unavailable

Part no. A6399005400-1

Mercedes Vito W639 Fuse Box Relay Control Unit Electric Module SAM A6399005400

Product currently unavailable

Part no. A6395420018

Mercedes Vito W639 Steering Wheel Angle Sensor Ring Squib A6395420018

Product currently unavailable

Part no. A0015455716

Mercedes Vito W639 Automatic Gearbox EGS Control Unit Module ECU A0015455716

Product currently unavailable

Part no. A2059002211

Display Mercedes C205 Dashboard Central Multimedia Car System Screen A2059002211

Product currently unavailable

Part no. A2219009202

Parktronic Module Mercedes W221 W216 Parking Sensor Control Unit A2219009202

Product currently unavailable

Part no. A1699000100

Mercedes-Benz A B W169 W245 Front Left Door N/S Control Unit Module A1699000100

Product currently unavailable

Part no. A2721540102

Alternator Mercedes W211 Alternator Generator Bosch 14V 180A A2721540102

Product currently unavailable

Part no. A6511505933

Engine Wiring Mercedes W212 Diesel OM651 Cable Loom Harness A6511505933

Product currently unavailable

Part no. A2208203685

Mercedes W220 Headlight Head Lamp Control Module Unit A2208203685

Product currently unavailable

Part no. A2129006429

Mercedes SLK R172 C207 Front Fuse Box Relay Control Unit SAM Module A2129006429

Product currently unavailable

Part no. A2709002900-1

Mercedes X156 GLA200 M270.910 156HP Engine Control Unit ECU Kit A2709002900 Key

Product currently unavailable

Part no. A0141542702

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

Product currently unavailable

Part no. A2215403250

Mercedes W221 Fuse Box Control Unit SAM Module Relay A2215403250

Product currently unavailable

Part no. A4479000001

Mercedes W447 Front Door Module Left N/S Control Unit ECU A4479000001

Product currently unavailable

Part no. A1665408332

Mercedes W166 Parking Sensor Wiring Loom Cable Harness Front PDC A1665408332

Product currently unavailable

Part no. A2479004415

Telematics Module Mercedes W213 H243 Communication Blutooth Control A2479004415

Product currently unavailable

Part no. A0001501780

Ignition Coil Mercedes W202 W203 M111 Cable Connector A0001501780

Product currently unavailable

Part no. A1695407705-1

Mercedes W169 W245 Door Cable Harness Wiring Loom Front Left N/S A1695407705

Product currently unavailable

Part no. A2198200089

Antenna Amplifier Mercedes CLS C219 Pillar C Left N/S Aerial Module A2198200089

Product currently unavailable

Part no. A1645400072

Mercedes ML W164 Front Fuse Box SAM Relay Control Unit Module A1645400072

Product currently unavailable

Part no. A2078210411

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

Product currently unavailable

Part no. A6549009400-3

Mercedes W907 315CDI OM654.920 Engine Unit Module ECU Kit A6549009400 BCM + Key

Product currently unavailable

Part no. A2465405901

Mercedes-Benz A B W176 W246 Left Right Seat Wiring Loom Harness A2465405901

Product currently unavailable

Part no. A4475460064

Mercedes W447 Fuse Box Module Cover Trim Trunk A4475460064

Product currently unavailable

Part no. A2711534691

Mercedes W203 C200 Kompressor M271.940 163HP Engine ECU A2711534691 Automatic

Product currently unavailable

Part no. A0993200258

Mercedes W213 C238 Air Suspension Valve Block Control Unit Module A0993200258

Product currently unavailable

Part no. A2139062610

SD Card Mercedes X156 W176 W205 Garmin Map Pilot Navigation Europe A2139062610

Product currently unavailable

Part no. A2129006709

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

Product currently unavailable

Part no. A1715450101

Mercedes SLK R171 Fuse Box SAM Relay Control Unit Module A1715450101

Product currently unavailable

Part no. A2229008816

Mercedes W213 Parking Control Unit Camera View Module ECU Parktronic A0009006418

Product currently unavailable

Part no. A2389008601

Communication Module Mercedes W177 W205 W213 X253 Hermes LTE Unit A2389008601

Product currently unavailable

Part no. A1715404209

Roof Wiring Mercedes SLK R171 Covertible Roof Opening Wring Harness A1715404209

Product currently unavailable

...

Showing 1981-2079 of 3165 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