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.

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Part no. A2135452840

Mercedes W213 ECU Bracket Control Unit Module Holder Mount A2135452840

PLN 56.95

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PLN 949.95

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Air Module Mercedes Sprinter W907 W910 Control Module ECU A9079004105

PLN 332.95

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Gateway Module Mercedes W169 W211 W245 W219 W203 Control Unit ECU A2115408445

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PLN 379.95

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Mercedes W204 W207 Control Unit ECU Sensor Module Air SRS Bag A2079011800

PLN 237.95

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Part no. A2118703126

Headlight Module Mercedes C209 W211 CLS C219 Level Control Unit ECU A2118703126

PLN 42.95

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Mercedes Vito W447 OM622 Engine Starter Wiring Harness A4475408347

PLN 61.95

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Mercedes C118 C253 Rear Bumper Switch Sensor Module A2139058101

PLN 237.95

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Part no. A2129010700

Mercedes W212 ECU Control Unit Sensor Module Airbag A2129010700

PLN 42.95

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Mercedes C292 SAM Module Rear Control Unit A1669004519

PLN 189.95

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Door Control Module Mercedes W169 W245 Relay Unit Right Rear O/S A1698209226

PLN 61.95

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Mercedes-Benz M ML W163 Rear Left Right Door Wiring Loom Harness A1635400734

PLN 47.95

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Part no. A2054402834

Mercedes W205 Parking Sensor Wiring Rear Bumper PDC Loom Cable A2054402834

PLN 189.95

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Part no. A2128203589

Antenna Amplifier Mercedes W212 Aerial Module Rear Roof Frame Right A2128203589

PLN 42.95

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Part no. A2059004521

Door Module Mercedes W205 GLC C253 Rear Left N/S Control Unit ECU A2059004521

PLN 47.95

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Mercedes C205 Sam Control Module Body Comfort ECU A2059007134

PLN 237.95

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Mercedes W205 Rear Door Control Module Unit Left N/S ECU A2059001811

PLN 61.95

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Mercedes W164 Front Right O/S Cable Wiring Duct A1645460261

PLN 47.95

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Mercedes-Benz CLC-Class CL203 Antenna Amplifier Rear Right O/S A2038270642

PLN 85.95

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Fuse Box Mercedes W177 Relay Fuse Box COntrol Module Unit A1779061102

PLN 284.95

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Part no. A9065420518

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PLN 42.95

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Part no. A2049007508

Mercedes W204 Display Screen Monitor Radio Sat Nav Navigation Unit A2049007508

PLN 94.95

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Part no. A2215457832

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PLN 284.95

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PLN 47.95

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Mercedes W204 Battery Bracket Mount Support Holder A2046280218

PLN 42.95

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Mercedes W204 Parking Control Unit Module ECU A2049012604

PLN 113.95

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Mercedes W205 C253 Diesel Adblue Module Control Unit ECU A0009009209

PLN 94.95

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PLN 123.95

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Module Mercedes C205 Transmission Drivetrain Control Module Unit A2059007705

PLN 56.95

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Mercedes W177 W205 C257 Radar Sensor Front Control Unit Module A2139002817

PLN 712.95

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Part no. A2219005503

Mercedes W221 Air Suspension Module Regulation Control Unit A2219005503

PLN 142.95

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Part no. A0061514401

Starter Motor Mercedes W204 W211 W212 OM642 Diesel Engine A0061514401

PLN 123.95

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Part no. A0035423019

Power Relay Control Mercedes W176 W246 Module 4 Pin 12V 20A A0035423019

PLN 42.95

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Part no. A2199001100

Mercedes W219 Head Unit CD Player Navigation COMAND Radio Audio Unit A2199001100

PLN 1,139.95

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Part no. A2079010100

Air Module Mercedes W207 C207 Coupe Control Unit ECU A2079010100 5WK43967

PLN 123.95

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Part no. A9079001705

Mercedes Sprinter B907 Ignition Control Module Keyless A9079001705

PLN 427.95

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Part no. A2189002002

Mercedes X218 CLS350 Automatic Trunk Lid Clossing Control Module A2189002002

PLN 142.95

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Part no. A1715400107

Mercedes SLK R171 Window Lifter Lift Switch Cable Wiring Harness A1715400107

PLN 42.95

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Part no. A2075401650-1

Mercedes W204 Fuse Prefuse Box Relay Electrical Control Unit A2075401650

PLN 189.95

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Part no. A2469004313

Gearbox Module Mercedes W176 Automatic Transmission Unit ECU A2469004313

PLN 61.95

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Part no. A0009006007

Fuel Pump Module Mercedes W205 Control Unit ECU A0009006007

PLN 61.95

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Part no. A6394405009

Wiring Loom Mercedes W639 Vito Cable Door Wiring Cable A6394405009

PLN 37.95

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Part no. A2215408507

Mercedes W221 Door Wiring Harness Cable Front Left Right N/O/S A2215408507

PLN 94.95

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Part no. A0009004836

Mercedes W177 W247 Driving Dynamics Module Control Unit ECU A0009004836

PLN 664.95

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Roof Microphone Mercedes Citan W415 Interior Mic Unit Wiring Cable 283930431R

PLN 61.95

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Part no. A1669003407

Mercedes W176 W204 Digital Audio DAB Receiver Control Unit Module A1669003407

PLN 94.95

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Part no. A2229004320

Telematics Module Mercedes C238 Communication Blutooth Control A2229004320

PLN 265.95

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Part no. A2469003417

Parking Brake Module Mercedes W176 W231 W246 Electric Control Unit A2469003417

PLN 42.95

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Mercedes GLE W166 C292 Front Seat Occupancy Sensor Wire Harness A1668200400

PLN 379.95

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Part no. A2219005404

Mercedes R231 Seat Memory Control Unit Module Front Right A2219005404

PLN 1,662.95

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Part no. A2465402610

Mercedes-Benz A B W176 W246 160 180 CDI Alternator Cable Loom Wire A2465402610

PLN 66.95

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Mercedes W205 Front Axle Damper Adjustment Left N/S Wiring Harness A2055403706

PLN 123.95

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Mercedes W221 Multimedia Interface USB Adapter Port Socket A2188200187

PLN 94.95

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Part no. A1245401850

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PLN 332.95

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Mercedes W212 E250CDI Blue Efficiency OM651 204HP Engine Module ECU A6519007401

PLN 379.95

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Mercedes Vito W639 Gateway Control Unit Module A2034450000

PLN 42.95

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Mercedes SLK R171 Air Module System Control Unit ECU A1718206526

PLN 284.95

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PLN 94.95

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Mercedes W176 W212 W246 Telematics Communication Control Unit Module A2059007123

PLN 42.95

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Part no. A2129005212

Radio Head Unit Mercedes W212 COMAND Navi CD DVD Player Navigation A2129005212

PLN 854.95

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Door Module Mercedes W177 W247 Rear Left Right N/O/S Control Unit A1779008511

PLN 170.95

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Part no. A4475402231

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PLN 113.95

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Mercedes W156 W176 Battery Cable Negative Lead Terminal Harness A2469052403

PLN 75.95

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Part no. A1695403945-1

Mercedes W169 W245 Central Gateway Control Unit Module ECU A1695403945

PLN 47.95

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Part no. A0038201926

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PLN 61.95

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PLN 379.95

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Energy Distributor Mercedes W205 W238 Power Control Unit Module A0009822112

PLN 61.95

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Part no. A2045455640

Mercedes Benz C E W204 W207 Control Unit Module SAM Bracket Mount A2045455640

PLN 18.95

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Part no. A1779001604

Mercedes W177 W247 Door Module Front Right Control Unit A1779001604

PLN 47.95

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Part no. A9079008805

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PLN 379.95

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PLN 142.95

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Mercedes W213 W222 Fuse Box Rear Electrical Fuse Unit Module A2139062202

PLN 94.95

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Part no. A1569057900

Mercedes W176 Aerial Antenna Amplifier A1569057900

PLN 37.95

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Part no. A6461505072-1

Mercedes W211 E220 CDI 646.821 170HP Engine ECU Kit A6461505072 Ignition + Key

PLN 949.95

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Mercedes Vito W639 Battery Terminal Fuse Box Control Unit Module A6395400150

PLN 56.95

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Mercedes ML W164 OM642 Diesel Engine Control Unit Module ECU A6421509478

PLN 759.95

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PLN 94.95

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PLN 569.95

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Battery Cable Mercedes W176 W246 Terminal Starter Wiring Harness A2465405933

PLN 42.95

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Part no. A2129060005

Fuse Box Mercedes W212 Rear Relay Control Unit Electric Module SAM A2129060005

PLN 142.95

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Part no. A2229001809

Mercedes W205 W222 Door Module Front Left N/S Control Unit ECU A2229001809

PLN 61.95

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Part no. A6394405109

Mercedes Vito W639 Wiring Harness Rear Boot Trunk Lid Tailgate Loom A6394405109

PLN 142.95

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Part no. 307873750AA

Mercedes W176 Steering Wheel Wiring Loom Harness 307873750AA

PLN 93.95

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Part no. A2128270228-ING

Mercedes W212 Estate Roof Antenna Cover Shark Indium Grey Metallic A2128270228

PLN 85.95

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Showing 1288-1386 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 .

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