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. A0035420819

Mercedes W176 W205 W213 W242 W447 W907 Relay 4-Pin Black Tyco Unit A0035420819

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129004910

Radio Head Unit Mercedes W212 CD Audio Player Head Control Unit A2129004910

PLN 284.95

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Part no. A2319009106

Door Module Mercedes R231 Front Door Right O/S Control Module A2319009106

PLN 189.95

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Part no. A6519007500-3

Mercedes W204 C220CDI BlueEFFICIENCY OM651.911 Engine ECU Kit A6519007500 Key

PLN 1,329.95

Free delivery - Mon, Nov 24

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Part no. A1645400762

Mercedes W164 W211 C219 Tyre Pressure Monitor Control Unit Module A1645400762

PLN 56.95

Delivery - Mon, Nov 24

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Part no. A1031550435

Mercedes W124 M103 Bracket Alternator Mount Holder Support A1031550435

PLN 94.95

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Part no. A0009063903

Alternator Generator Mercedes W205 W213 Diesel Engine Valeo 200A A0009063903

PLN 474.95

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Part no. A2044401705

Mercedes S204 Door Wiring Loom Cable Rear Left Right N/O/S A2044401705

PLN 46.95

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Part no. A9076830400

Mercedes W907 Fuse Box Relay Cover Lid Control Unit Bracket Trim A9076830400

PLN 61.95

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Part no. A2129004114

Door Module Mercedes W204 W212 Rear Left N/S Control Unit A2129004114

PLN 37.95

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Part no. A1669061202

Mercedes W221 Fuse Box Control Unit Module Relay A1669061202

PLN 142.95

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Part no. A2513200058

Mercedes ML W164 W221 Air Suspension Valve Block Control Unit Module A2513200058

PLN 189.95

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Part no. A2049003509

Mercedes W204 S204 Radio Head Unit Sat Nav CD Player 2049003509

PLN 189.95

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Part no. A2055400555

Mercedes W205 Door Electrical Wiring Harness Front Left N/S A2055400555

PLN 94.95

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Part no. A2055404797

Battery Cable Mercedes GLC X253 Starter Motor Alternator Wiring A2055404797

PLN 189.95

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Part no. A9075407312

Mercedes W907 Battery Fuse Box Positive Distribution Terminal A2479061803

PLN 474.95

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Part no. A0005427700

Mercedes GLE C292 Coupe Parking PDC Sensor Display Device Unit A0005427700

PLN 85.95

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Part no. RHD-A1664404337

Mercedes C292 Positive Cable Battery Starter Alternator Plus Wiring A1664404337

PLN 284.95

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Part no. A6401508334-1

Engine Control Unit Mercedes W245 B200 CDI OM640.941 140HP ECU A6401508334

PLN 123.95

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Part no. A1725408705

Mercedes R172 Electrical Wiring Harness Cable Window Regulator A1725408705

PLN 66.95

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Part no. A2025402373-1

Mercedes A C E Class 1 W169 W203 W211 OBD Diagnostic Plug Cover A2025402373

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2135406100

Fuse Box Mercedes W205 Interior Equipment Fuse Box Control Module A2135406100

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2038219551-2

Mercedes CL203 Rear Roof Alarm Motion Sensor Control Unit Module A2038219551

PLN 56.95

Delivery - Mon, Nov 24

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Part no. A0365457032

Mercedes C209 W211 CLS C219 Steering Wheel Module Control Unit A0365457032

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A6394409909

Wiring Loom Mercedes W639 Vito Cable Sliding Door Rear Left N/S A6394409909

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2215400401

Mercedes W221 Power Supply Battery Control Module Unit A2215400401

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A0045467640

Distributor Box Mercedes W204 W207 W221 Connector Block Control Unit A0045467640

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1669062300

Mercedes W221 Rear Armrest DVD Player Control Headunit A1669062300

PLN 284.95

Free delivery - Mon, Nov 24

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Part no. A1679003418

Mercedes W205 C253 W257 Door Module Rear Left N/S Control Unit ECU A1679003418

PLN 284.95

Free delivery - Mon, Nov 24

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Part no. A1669004719

Audio Amplifier Mercedes W166 C292 Sound Control Unit Harman Kardon A1669004719

PLN 2,659.95

Free delivery - Mon, Nov 24

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Part no. A2055407616

Wiring Mercedes W205 Electrical Cable Transmission To Body A2055407616

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2465409611

Mercedes-Benz A B Class W176 W246 Battery Surround Trim Box Bracket A2465409611

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2129003414

Fuse Box Mercedes C204 W204 Front Relay Control Unit Module SAM A2129003414

PLN 455.95

Free delivery - Mon, Nov 24

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Part no. A2229005613

Rear View Camera Module Mercedes W205 W222 W253 Control Unit A2229005613

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A2711500391-7

Mercedes W204 C180 Engine Unit BlueEFFICIENCY 271.820 156HP ECU A2711500391

PLN 759.95

Free delivery - Mon, Nov 24

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Part no. A0035422319

Mercedes W176 W246 Relay Battery Decoupling 12V A0035422319

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2038202285

Mercedes-Benz C-Class W203 Door Control Module Right Rear O/S A2038202285

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1649005001

Mercedes ML W164 Sam Control Module Fuse Box Unit A1649005001

PLN 2,374.95

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Part no. A0141541102

Alternator Generator Mercedes W204 W207 Diesel Engine Valeo 150A A0141541102

PLN 379.95

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Part no. A2124400706

Wiring Harness Mercedes W212 LED Lighting Air Nozzle Cable A2124400706

PLN 56.95

Delivery - Mon, Nov 24

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Part no. A2215408609

Mercedes W221 Rear Door Wiring Harness Cable Left N/S A2215408609

PLN 142.95

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Part no. A6519003403-1

Mercedes W906 314 CDI OM651 Engine Unit Module ECU Kit Key Lock A6519003403

PLN 1,899.95

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Part no. A1679008812

Seat Module Mercedes W167 W177 W247 Control Unit ECU A1679008812

PLN 161.95

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Part no. A6549009400

Mercedes W447 W907 W910 Engine Control Unit Module ECU A6549009400

PLN 759.95

Free delivery - Mon, Nov 24

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Part no. A1679009330

Mercedes C118 W167 W177 W243 W247 Ignition Control Module Unit ECU A1679009330

PLN 1,139.95

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Part no. A6397600104

Bowden Cable Mercedes W639 Vito Door Handle Catch Top Rear Left Wire A6397600104

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2535402605

Mercedes GLC X253 Rear Bumper Wiring Loom PDC Harness Parking Sensor A2535402605

PLN 284.95

Free delivery - Mon, Nov 24

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Part no. A2128270228-SEL

Mercedes W212 Roof Antenna Amplifier Shark Selenite Grey - 992 A2128270228

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A2429004801

Mercedes W176 W204 W212 Telematics Communication Control Unit Module A2429004801

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A1779002510

Mercedes W177 W247 Safety Module Air Module SRS Control Unit ECU A1779002510

PLN 522.95

Free delivery - Mon, Nov 24

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Part no. A0009003206

Mercedes W205 W222 Fuel Pump Module Control Unit A0009003206

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A0005400502

Mercedes W212 W221 W447 W906 Adblue Injector Wiring Cable Loom A0005400502

PLN 70.95

Free delivery - Mon, Nov 24

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Part no. A6541400155

Mercedes-Benz W213 Genuine Gas Filter Pressure Line Sensor Dpf A6541400155

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A2198203626

Mercedes CLS W219 Door Module Rear Right O/S Control Unit A2198203626

PLN 66.95

Free delivery - Mon, Nov 24

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Part no. A2229002014

Mercedes X253 Door Module Rear Right Control Unit A2229002014

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A0025407097-1

Mercedes W221 Air Pump Valve Pressure Electric Change Over Sensor A0025407097

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2059004113

Mercedes S205 Display Screen Multimedia Navigation Sat Head Unit A2059004113

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A2034404913

Mercedes-Benz CLC CL203 Rear Tailgate Boot Lid Wiring Harness Loom A2034404913

PLN 65.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2054400534

Mercedes C205 Bumper PDC Wiring Loom Rear Parking Sensor A2054400534

PLN 189.95

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Part no. A6395460035

Mercedes Vito W447 W639 Battery Terminal Protection Cap Cover A6395460035

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2469003014

Mercedes W176 W231 W246 Electric Parking Brake Control Unit Module A2469003014

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A6569000200-1

Mercedes W213 E400d OM656.929 Diesel Engine ECU Kit A6569000200 Automatic

PLN 2,279.95

Free delivery - Mon, Nov 24

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Part no. A6549009600-3

Mercedes GLC 220d X253 654.920 194HP 4Matic Engine Control Unit A6549009600

PLN 854.95

Free delivery - Mon, Nov 24

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Part no. A2135402870

Ground Cable Mercedes C238 Fuse Box Wire Prefuse Box Wiring A2135402870

PLN 141.95

Free delivery - Mon, Nov 24

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Part no. A2475451000

Mercedes W177 W247 Battery Bracket Battery Mount Holder Trim A2475451000

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A0535450226

Mercedes Sprinter W906 Fuse Box Connector Plug Socket A0535450226

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2469003114

Transmission Module Mercedes W176 W246 Control Unit ECU A2469003114

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A2059007521

Module Mercedes W205 Air Conditioning A/C System Control Module A2059007521

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2479008607

SAM Module Mercedes W177 W247 Front SAM Body Comfort Control Unit A2479008607

PLN 379.95

Free delivery - Mon, Nov 24

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Part no. A2135405542

Mercedes W205 Electrical Wire From Transmission To Body Ground Cable A2135405542

PLN 61.95

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Part no. A2115454840

Mercedes E-Class S211 W211 Battery Tray Holder Mounting Bracket A2115454840

PLN 42.95

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Part no. A0009820512

Energy Distributor Mercedes W177 W212 Power Control Unit Module A0009820512

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2048204697

Mercedes W204 Dashboard Dash Navigation Central Display Screen Monitor

PLN 759.95

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Part no. A2469004519

Gearbox Module Mercedes W176 W246 Control Unit ECU Automatic A2469004519

PLN 189.95

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Part no. A2465406607-1

Positive Cable Mercedes W176 W246 Battery Lead Plus Pole Red A2465406607

PLN 61.95

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Part no. A2059067200

Mercedes W205 S205 W213 Fuse Box Front Relay Control Unit Module A2059067200

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1179001802

Mercedes W176 Air Module Belt Locking System Control Unit Module ECU

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A2059007143

SAM Module Mercedes W205 Trunk Rear SAM Control Module A2059007143

PLN 408.95

Free delivery - Mon, Nov 24

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Part no. A0009008718

Climate Control Module Mercedes W205 W213 Air Conditioning A/C Unit A0009008718

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A0141540402

Alternator Mercedes W164 OM272 Engine Alternator 180A 14V Valeo A0141540402

PLN 369.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A9105400805

Mercedes Sprinter W910 Fuel Tank Wiring Loom Cable Harness A9105400805

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2469052602

Dashboard Panel Mercedes W176 W246 Switch Dynamic Select Start/Stop A2469057902

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A2139007105

Air Module Mercedes W213 S213 W238 SRS Control Unit ECU A2139007105

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A1669005417

Mercedes X117 Communication Telematics Control Module Unit ECU A1669005417

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1775402811

Mercedes W177 W243 W247 Rear Door Wiring Harness Cable Left N/S A1775402811

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2044401001

Parktronic Module Mercedes W204 PDC Parking Sensors Control Unit A2044401001

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2229002109

Mercedes W205 W222 Door Module Control Unit Rear Right O/S A2229002109

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2465400335

Mercedes W176 W246 Negative Earth Cable Battery Terminal Wiring A2465400335

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009051600

Mercedes W207 W212 W221 Front Windscreen Windshield Camera A0009051600

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A2075404207

Mercedes W204 M276 NOX Sensor Adapter Right O/S Harness Wiring Cable A2075404207

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2465400512

Seat Wiring Mercedes C117 Front Seat Left Wiring Harness a2465400512

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A9075401805

Mercedes Sprinter W907 Battery Terminal Unit Connection Box A9075401805

PLN 123.95

Free delivery - Mon, Nov 24

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Part no. A2539000100

Rain Light Sensor Mercedes X253 Windschield Sensor Module Unit A2539000100

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2229003210

Mercedes W205 Head Unit Audio Player Radio Sat Nav Module A2229003210

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A2465401205

Mercedes-Benz A B W176 W246 Left N/S Parking Brake Electrical Wiring Cable

PLN 75.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0005400664

Mercedes W205 Battery Cable Wiring Harness Loom Petrol Hybrid A0005400664

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2049057501

Mercedes W204 W212 Dashboard Light Sun Solar Sensor Unit A2049057501

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2059068501

Mercedes W205 Fuse Box Rear Relay Electrical Control Unit Box A2059068501

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2048210851

Mercedes W212 Windscreen Rain Sensor Temperature Humidity Unit A2048210851

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

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Showing 199-297 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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