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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Products in promotion

Part no. A2661503133

Engine Wiring Mercedes W169 W245 M266 Petrol Cable Loom Harness A2661503133

PLN 474.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0025429319

Mercedes C117 W166 W176 W205 X253 Relay Black Control Unit 4 Pin 12V A0025429319

PLN 75.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2139003208

Mercedes W213 SAM Module Rear Body Comfort Control Unit ECU A2139003208

PLN 189.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2469009212

Mercedes X117 Tailgate Boot Control Rear Module Unit A2469009212

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A0025428919

Relay Mercedes W176 W246 5-Pin Yellow Hella 12V A0025428919

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2034621130

Mercedes W203 Steering Column Lock Control Unit Module A2034621130

PLN 94.95

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Part no. A2059006013

Door Module Mercedes W205 Front Right O/S Door Control Module Unit A2059006013

PLN 56.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009060922

Alternator Mercedes W212 W447 X253 C238 Petrol M274 150A Bosch A0009060922

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A2038201585

Mercedes W203 Door Control Module Front Left N/S A2038201585

PLN 61.95

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Part no. A2049060405

Mercedes W204 Front Fuse Board Box Relay Unit Case A2049060405

PLN 94.95

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Part no. A6519000601-1

Mercedes W906 313 CDI 651.955 129HP Diesel Engine ECU Key Lock Kit A6519000601

PLN 1,234.95

Free delivery - Mon, Nov 24

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Part no. A2049006003

Radio Player Mercedes W204 Audio 20 Navi CD Player Head Unit A2049006003

PLN 902.95

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Part no. A1729007313

Mercedes SLC R172 PDC Parking Sensor Module Unit ECU A1729007313

PLN 379.95

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Part no. A1775401758

Mercedes W118 W177 W247 Starter Alternator Wiring Loom Harness Cable A1775401758

PLN 341.95

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Part no. A0018203126

Mercedes W168 Air Module Belt Locking System Sensor Control Unit Module ECU

PLN 42.95

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Part no. A2129005327

Radio Head Unit Mercedes W212 COMAND Navi CD DVD Player Changer A2129005327

PLN 1,139.95

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Part no. A2478207502

Mercedes C118 W177 W243 W247 Centre Console Dual USB-C Socket Ports A2478207502

PLN 123.95

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Part no. A2125400035

Earth Ground Cable Mercedes W204 W207 W212 Battery Starter Wiring A2125400035

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2115400008

ABS Sensor Mercedes W211 C219 Front Brake Wiring Harness Right O/S A2115400006

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A0009057302

Windscreen Camera Mercedes W204 W212 Front Windshield Camera Unit A0009057302

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A1175401205

Mercedes C117 Drivers Door Wiring Harness A1175401205

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2218707386

Mercedes W221 Door Control Unit Module Right Rear O/S A2218707386

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A2105460141

Mercedes-Benz E-Class W210 Battery Cable Box Connector Petrol A2105460141

PLN 27.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2469008113

Mercedes GLE X156 4Matic Transfer Control Unit Module ECU A2469008113

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A0005406904

Mercedes X253 Ground Line Battery Earth Cable Wire A0005406904

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2128205026

Mercedes W212 Impact Crash Sensor Door Left Right A2128205026

PLN 37.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2215406562

Mercedes W204 Petrol Fuel Pump Control Unit Module A2215406562

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2059004013

Mercedes W205 Air Conditioning Control Module A/C ECU Unit A2059004013

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. 6922652

BMW X3 E91 E83 Sunroof Sliding Roof Drive Unit Motor Actuator 6922652

PLN 123.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2465401350

Fuse Box Mercedes W156 W176 W246 Front Relay Control Unit Module A2465401350

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2059008304

Mercedes W205 SAM Module Rear Body Comfort Control Unit ECU A2059008304

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2829006700

Mercedes W177 A200 M282.814 163HP Engine Control Unit ECU A2829006700 Automatic

PLN 1,139.95

Free delivery - Mon, Nov 24

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Part no. A2205400031

Mercedes A B S Class W169 W220 W245 Battery Lead Cable Negative A2205400031

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2115460580

Wiring Holder Mercedes W211 Cable Loom Harness Cover Channel A2115460580

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2044407441

Earth Ground Cable Mercedes W204 W207 W212 W218 Battery Wiring Loom A2044407441

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2465400340-2

Mercedes W176 Fuse Relay Box Control Unit A2465400340 A2465400140

PLN 65.95

Free delivery - Mon, Nov 24

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Part no. A2118203375

Antenna Booster Mercedes W211 Rear Boot Lid Tailgate Amplifier A2118203375

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2229000905

Mercedes W205 PDC Park Assist Control Module Ecu A2229000905

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A6519002803-3

Mercedes Vito W447 114 CDI OM651.950 Engine ECU Kit Ignition + 2 Key A6519002803

PLN 1,899.95

Free delivery - Mon, Nov 24

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Part no. A1775401731

Mercedes W177 M282 Wiring Harness Battery Starter Motor Alternator A1775401731

PLN 284.95

Free delivery - Mon, Nov 24

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Part no. A2075400440

Mercedes-Benz E-Class A207 Additional Battery Tray Holder Mounting Bracket

PLN 46.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1729007003

Seat Module Mercedes W204 W212 Control Unit Front Left Right N/O/S A1729007003

PLN 275.95

Free delivery - Mon, Nov 24

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Part no. A2139008430

Mercedes W910 Gearbox Control Module A2139008430

PLN 113.95

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Part no. A2829003300

Mercedes W177 A200 163HP M282.914 Engine Control Unit ECU A2829003300 Automatic

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A1775403131

Mercedes w177 Sensor Wiring Harness Cable Front A1775403131

PLN 123.95

Free delivery - Mon, Nov 24

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Part no. A1698702210

Mercedes-Benz A B W169 W245 Tow Protection Switch Button Control Unit Module

PLN 37.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2229005118

Mercedes W205 Ambient Color Light Module ECU A2229005118

PLN 70.95

Free delivery - Mon, Nov 24

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Part no. A6396890379

Mercedes Viano Vito W639 Radio Fan Adapter Control Unit Module A6396890379

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A6081550035

Mercedes W177 Alternator Mounting Bracket Carrier A6081550035

PLN 284.95

Free delivery - Mon, Nov 24

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Part no. A0035453501

Mercedes Vaneo W414 Sprinter W901 W902 W903 Fuse Box Battery A0035453501

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2049069701-1

Mercedes W204 Radio Player Audio 20 Navi CD Player Head Unit A2049069701

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A2059004321

Mercedes W205 X253 Front Right O/S Door Control Unit Module A2059004321

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A6395406809

Wiring Loom Mercedes W639 Vito Cable Door Wiring Cable A6395406809

PLN 56.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2125406905

Mercedes W212 Door Wire Wiring Loom Front Left N/S A2125406905

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1698207026

Mercedes-Benz A B Class W169 W245 Door Control Unit Right O/S Front A1698207026

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. N000000004325-1

Mercedes W169 W204 W211 C219 Replacement Fuse Kit Set N000000004325

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009004802

Air Module Mercedes W639 W906 ECU Control Unit Crash Impact A0009004802

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A6519005301-15

Mercedes W204 W212 E220CDI OM651 Diesel Engine Control Module ECU A6519005301

PLN 483.95

Free delivery - Mon, Nov 24

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Part no. A6397601804

Mercedes Vito W639 Door Handle Bowden Cable Catch Rear Wire A6397601804

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2128270228-PAL

Mercedes W212 Aerial Fin Roof Antenna Shark Palladium Silver - 792 A2128270228

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A2711535391-2

Mercedes R171 SLK 200K 184HP M271.944 Engine ECU Kit A2711535391 Key Lock

PLN 1,044.95

Free delivery - Mon, Nov 24

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Part no. A2439000800

Drivetrain Module Mercedes H243 Transmission Control Unit ECU A2439000800

PLN 712.95

Free delivery - Mon, Nov 24

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Part no. A1648205389

Mercedes ML W164 Aerial Antenna Amplifier Unit Module A1648205389

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A0001594942

Mercedes-Benz C-Class W203 M111 Ignition Coil Cable Connector A0001594942

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1775405101

Door Wiring Mercedes V177 Rear Door Right Left N/O/S Harness Wire A1775405101

PLN 66.95

Free delivery - Mon, Nov 24

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Part no. A1648205685

Air Module Mercedes ML W164 W251 SRS Control Unit ECU A1648205685

PLN 104.95

Free delivery - Mon, Nov 24

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Part no. A9078209600

Mercedes W907 L2H2 Electric Radio Player Head Unit A9078209600

PLN 474.95

Free delivery - Mon, Nov 24

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Part no. A2048208526

Mercedes W204 Parking Sensor Parktronic Display Control A2048208526

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009822723

Mercedes W205 Estate Fuse Relay Box Module Control A0009822723

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2385452700

Mercedes C238 Rear Control Unit Module Bracket Holder Trim Panel A2385452700

PLN 66.95

Free delivery - Mon, Nov 24

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Part no. A2749000800-4

Mercedes W205 C200 274.920 184HP Engine Control Unit ECU A2749000800 Manual

PLN 474.95

Free delivery - Mon, Nov 24

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Part no. A2049005503

Mercedes C207 Complete Damper Adjustment Control Module ECU A2049005503

PLN 284.95

Free delivery - Mon, Nov 24

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Part no. A2035407308

Mercedes-Benz C-Class W203 Rear Left Right Door Wiring Loom Harness A2035407308

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A9079053907

Mercedes Sprinter W907 W910 Battery Sensor Cable Negative Terminal A9079053907

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A2469067100-1

Mercedes W176 W246 C117 Fuse Relay Box Unit Cables Wiring Loom A2469067100

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A1679007012

Mercedes C118 W177 W247 Keyless Go Module ECU Entry Control Unit A1679007012

PLN 218.95

Free delivery - Mon, Nov 24

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Part no. A2465411005

Battery Cover Mercedes C117 W176 W246 Box Trim Lid Panel Housing A2465411005

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2114406209

Mercedes W211 OM646 Battery Cable Starter Alternator Wiring Harness A2114406209

Product currently unavailable

Part no. A2124407952

Mercedes W212 W218 Battery Cable Negative Lead Terminal Harness A2124407952

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2048708026

Mercedes W204 Media Interface Control Unit Module ECU A2048708026

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2218702086

Mercedes W221 Rear Seat Control Module Unit ECU A2218702086

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A2761508800

Starter Cover Mercedes W205 W212 W213 M276 Heat Plate Motor Shield A2761508800

PLN 101.95

Free delivery - Mon, Nov 24

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Part no. A2059061905

Mercedes W205 Centre Console Lighting Wiring Harness Cable Loom A2059061905

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2469066600

Fuse Box Mercedes W156 W176 W246 Front Relay Control Unit Module A2469066600

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A2048200189

Mercedes-Benz C E Class W204 W207 Aerial Antenna Amplifier Unit A2048200189

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009008214

Mercedes W177 W247 W447 W907 Fuel Pump Module Control Unit ECU A0009008214

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2215460935

Mercedes W221 W216 Fuse Box Cover Control Unit Trim Panel Lid A2215460935

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2465452840

Mercedes-Benz A B W176 W246 Control Module Housing Bracket Mount A2465452840

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A0009828523

Mercedes W164 Suspension Compressor Relay A0009828523

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2469000717

Mercedes C117 X156 All Wheel Drive Control Unit Module ECU MFA A2469000717

PLN 142.95

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Part no. A6071550335

Alternator Belt Tensioner Mercedes W176 OM607 Diesel Holder Mounting Panel

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A1648701589

Mercedes ML W164 Aerial Antenna Amplifier Module Unit A1648701589

PLN 42.95

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Part no. A2135451140

ECU Bracket Mercedes W213 Control Unit Module Holder Mount A2135451140

PLN 61.95

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Part no. A2239053002

Mercedes Vito W447 Aerial Antenna Amplifier Control Unit Module A2239053002

PLN 237.95

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Part no. A2465402705

Mercedes W176 Door Harness Loom Cable Wiring Front Left Right N/O/S A2465402705

PLN 75.95

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Part no. A0009828323

Mercedes W176 W246 Power Relay Control Module 5 Pin 12V A0009828323

PLN 37.95

Delivery - Mon, Nov 24

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Part no. A2215402062

Fuel Pump Module Mercedes ML W164 W204 Petrol Control Unit ECU A2215402062

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A2479001709

Mercedes W907 Radio Control Unit ECU Module A2479001709

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A1729001906

Mercedes X218 CLS350 Communication Bluetooth Control Module A1729001906

PLN 47.95

Delivery - Mon, Nov 24

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Showing 1-99 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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