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. A2055457200

Mercedes W205 Radio Stereo Head Unit Mount Bracket Holder Support A2055457200

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A9079005303

Mercedes Sprinter W907 W910 Control Unit Module ECU A9079005303

PLN 379.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2219007701

Mercedes W221 Door Module Rear Right Left N/O/S Control Unit A2219007701

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0041518501-1

Mercedes W169 W245 Engine Starter Motor A0041518501

PLN 75.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A6511508300

Engine Wiring Mercedes W910 OM651.958 Diesel Harness Loom Cable A6511508300

PLN 569.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129000004

SAM Module Mercedes W212 Fuse Box Relay Control Unit A2129000004

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1695457740

Mercedes-Benz A B W169 W245 Bracket Starter Alternator Control Unit A1695457740

PLN 28.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1179008600

Airbag Module Mercedes w176 Air Bag SRS Control Unit ECU A1179008600

PLN 189.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129005200

Seat Module Mercedes W204 W212 Memory Control Unit Driver's Side A2129005200

PLN 189.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1729060005

Mercedes R172 Rear SAM Fuse Relay Box A1729060005

PLN 379.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1645400182

Mercedes ML W164 GL X164 Fuse Box Cover Trim Panel Cap A1645400182

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1179009101

Mercedes-Benz A-Class W176 CLA C117 Rear View Camera Control Module Unit ECU

PLN 284.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009007604

Adblue Module Mercedes W205 W213 W177 W907 SCR Control Unit EGR ECU A0009007604

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1779004106

Door Module Mercedes C118 W177 W247 Front Right O/S Control Unit A1779004106

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A9079003207

Mercedes W907 Air Suspension Level Control Unit Module Airmatic A9079003207

PLN 617.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2124404851

Mercedes W212 Rear Bumper PDC Wiring Parking Sensor Loom Harness A2124404851

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129004901

Fuse Box Mercedes W212 Rear SAM Relay Control Unit Module A2129004901

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1695458140

Mercedes W169 W245 Relay Control Unit Bracket Mount Holder Cover A1695458140

PLN 66.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2075402013

Door Cable Mercedes W212 Wiring Loom Front Left Right Door N/O/S A2075402013

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2038219751

Mercedes C-Class W203 Roof Alarm Motion Sensor Cover Trim Grey A2038219751

PLN 56.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129007024

Mercedes CLS C218 Front Fuse Relay Box On Board Supply A2129007024

PLN 322.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A6519005301-7

Mercedes W204 C250CDI 204HP OM651.911 Engine ECU Kit A6519005301 Automatic

PLN 807.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A9065460121

Mercedes W906 Battery Cable Negative Lead Wiring Harness A9065460121

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2035450803

Mercedes W203 Battery Terminal Fuse Box Electrical Unit A2035450803

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0018209326

Mercedes-Benz E CLS Class W211 W219 Crash Sensor Left Right N/O/S A0018209326

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2139003029

Mercedes A238 Fuse Box Control Unit SAM Module Relay A2139003029

PLN 379.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129004014

Mercedes W204 W212 Front Door Module Control Unit Module Left N/S A2129004014

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A6229000700

Mercedes W447 Bosch Glow Plug Relay Controller Unit Control Module A6229000700

PLN 332.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2218204189

Mercedes W221 Antenna Amplifier Aerial A2218204189

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1698700689-2

Mercedes W169 W245 CD Player Radio Stereo Head Unit A1698700689

PLN 100.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2535402128

Mercedes X253 Starter Motor Wiring Harness Cable A2535402128

PLN 284.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2215450801-1

Mercedes W221 Fuse Box Control Unit SAM Module Relay A2215450801

PLN 854.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2046801231

Mercedes W204 Dashboard Navigation Central Display Screen Monitor A2046801231

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2079012500

Air Module Mercedes C204 C207 Sensor Control Unit ECU A2079012500

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A9067601204

Mercedes Sprinter W906 Front Left Door N/S Handle Bowden Pull Cable A9067601204

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2055403103

Alternator Starter Wiring Harness Mercedes W205 GLC C253 OM651 A2055403103

PLN 123.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2535409530

Mercedes X253 Hybrid Engine Wiring Harness Loom Cable A2535409530

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1669063901

Mercedes ML W166 Relay Module Box Under Rear Right Seat F4 A1669063901

PLN 85.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0015424523

Parktronic Display Mercedes W207 W212 PDC System Parking Sensor A0015424523

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1718201726

Mercedes SLK R171 Seat Heated Heating Control Unit Module ECU A1718201726

PLN 103.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1779005509

Door Module Mercedes C118 W177 H243 Rear Left N/S Door Control A1779005509

PLN 284.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2218703086

Mercedes W221 Seat Module Front Right O/S Memory Control Unit A2218703086

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2045420323

PDC Display Mercedes W204 Front Parking Sensor Screen Control Unit A2045420323

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2055400182

Mercedes W205 W213 C238 C253 Relay Fuse Box Top Cover Lid Cap A2055400182

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1698201585

Mercedes W245 ECU Control Unit Sensor Air Module A1698201585

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1648209485

Mercedes ML W164 Door Module Front Right O/S Control Unit Module A1648209485

PLN 75.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A4479000900

Mercedes Vito W447 Air Module Control Unit ECU 4479000900

PLN 474.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1765400103

Battery Cable Mercedes C117 W176 Starter Alternator Wiring Harness A1765400103

PLN 322.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009821012

Mercedes W166 W213 C238 Power Distribution Plate Control Unit Module A0009821012

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A6519007401-3

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

PLN 807.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2035402206

Mercedes W203 Diesel Engine Starter Alternator Electrical Cable A2035402206

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1645403230

Mercedes ML W164 Positive Battery Terminal Cable Lead Wiring A1645403230

PLN 123.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2118703889

Mercedes W164 W169 W211 W245 W906 6 Disc CD Changer Player A2118703889

PLN 113.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1679004712

Bluetooth Module Mercedes W205 W213 W222 W238 Control Unit ECU A1679004712

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129009025

Mercedes W212 Fuse Box Front Relay Control Unit Module SAM A2129009025

Product currently unavailable

Part no. A2079053300

Mercedes-Benz W207 Cabrio A207 Rear Left N/S Radio Aerial Antenna Amplifier

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Part no. A0009057802

Crash Impact Sensor Mercedes C118 W177 W205 W247 Acceleration Unit A0009057802

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Part no. A1669007609

Mercedes ML W166 Door Control Module Unit ECU Front Right O/S A1669007609

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Part no. A0009063622

Mercedes W166 W204 R231 Alternator Generator 180A 14V A0009063622

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Part no. A6395407735

Mercedes Vito W639 OM646 Diesel Engine Wiring Cable Loom Harness A6395407735

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Part no. A2049000902

Fuse Box Mercedes W204 Rear SAM Relay Fuse Box Control Module A2049000902

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Part no. A1698206626

Mercedes W169 W245 Airbag System Control Unit Module ECU A1698206626

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Mercedes W204 Display Screen Radio Multimedia Navigation Sat Unit A1729016600

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Mercedes X218 CLS 350CDI OM642.853 Engine Control Unit ECU Kit A6421508900 Key

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Mercedes Vito Viano W639 Battery Cable Positive Wiring Harness A6735460011

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

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Mercedes R172 SLK500 M274 Engine Control Unit Module ECU A2749000900

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Alternator Mercedes Vito W639 Sprinter W906 14V 180A Generator Valeo A6461541102

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Parking Sensor Mercedes W169 Front Bumper Distance Parktronic Horizon Blue 391

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Part no. A1645402401

Mercedes W164 Front Fuse Box SAM Relay Control Unit Module A1645402401

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Part no. A9069000103

Mercedes Sprinter W906 Radio CD Player Audio Stereo Head Unit A9069000103

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Ignition Module Mercedes V177 Electronic Ignition Switch Keyless Control Unit

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Part no. A2215407545

Mercedes W221 Parking Aid Sensors Control Unit Module A2215407545

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Mercedes W169 W245 Aerial Roof Antenna Radio Rod A1698202675

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Part no. A1665400224

Mercedes W166 C292 Fuse Relay Box Cover Trim Panel Lid Housing A1665400224

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Part no. A1718205826

Mercedes SLK R171 Air Module Bag SRS Control Unit ECU A1718205826

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Voice Control Module Mercedes W221 Linguatronic Input System Dutch A2218703787

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Mercedes Vito W447 Battery Cable Diesel OM651 Alternator Wiring A4475406353

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Door Module Mercedes GLC X253 Rear Door Left Control Module A2059000828

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Fuse Box Mercedes Sprinter W907 Prefuse Box Module F150/1 - MFB-1 A9075406960

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Mercedes W166 W176 W246 Radar Sensor Front Control Unit Module A0009051302

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Mercedes R171 Convertible Roof Top Control Unit Module ECU A1718204226

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Mercedes W124 S124 Central Lock Control Unit Module A1248205926

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Driver Seat ECU Mercedes W203 A209 W211 Memory Control Unit Module A2118704626

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Mercedes-Benz M ML W163 OM612 Engine Wiring Harness Loom Cable A1635402810

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Mercedes W202 C208 W210 Fuse Box SAM Relay Control Unit Module A0195455632

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

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Showing 1486-1584 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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