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. A9075406749

Mercedes W907 Battery Electrical Ground Line Wire Earth Cable A9075406749

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. E92-PDC-WIRING-LOOM-HARNESS-REAR-BUMPER-1

BMW E92 LCI PDC Wiring Loom Harness Rear Bumper

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2709060500

Ignition Coil Mercedes W176 W204 C207 W212 Petrol Cable Connector A2709060500

PLN 66.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A9069820109

Mercedes Sprinter W906 Positive Battery Terminal Cover Cap Trim Red A9069820109

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2048702426

Mercedes W204 Door Module Rear Left N/S Control Unit Module A2048702426

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2218708285

Mercedes W221 Head Unit DVD High Line Radio Player Navigation A2218708285

PLN 2,184.95

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Part no. A2701590042

Ignition Coil Mercedes W176 M270 Petrol Ignition Cable Connector A2701590042

PLN 75.95

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Part no. A1686103436

Mercedes-Benz A-Class W168 Battery Clamp Holder A1686103436

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A9079006906

Mercedes Sprinter W907 W910 Ignition Lock Control Unit Module ECU A9079006906

PLN 759.95

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Part no. A6549061600

Starter Motor Mercedes W205 W213 W238 W447 OM654 Engine Diesel A6549061600

PLN 189.95

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Part no. A2135406200

Fuse Box Mercedes W213 S213 W238 Rear Electrical Control Unit Module A2135406200

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2465453740

Mercedes-Benz A B Class W176 W246 Rear Fuel Pump Control Unit Bracket Holder

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2229009915

Keyless Module Mercedes W205 W213 ECU Door Lock Control Unit A2229009915

PLN 66.95

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Part no. A9079051602

Mercedes W907 Aerial Antenna Amplifier Control Unit Module A9079051602

PLN 142.95

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Part no. A2079013700

Mercedes-Benz E-Class W207 Windscreen Windshield Rain Sensor Control Unit

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A0035455005

Mercedes W202 W210 Kick Down Kickdown Relay Electrical Module Unit A0035455005

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A6395406609

Wiring Loom Vito Mercedes W639 Front Door Cable Left Right N/O/S A6395406609

PLN 61.95

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Part no. A1775409141

Mercedes W177 W243 W247 Front Door Wiring Harness Cable Driver Side A1775409141

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A1698200089

Mercedes A B Class W169 W245 Aerial Antenna Amplifier Right O/S A1698200089

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A0015456403

Mercedes Sprinter W906 Fuse Box Relay Cover Box Cap A0015456403

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1725420023

Mercedes W176 W204 W246 Front Parking Sensor Display Control PDC A1725420023

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2139005213

Mercedes W213 Door Control ECU Module Front Left N/S A2139005213

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2229001909

Mercedes W205 W222 Door Module Front Right O/S Control Unit ECU A2229001909

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A2465405833

Mercedes W176 W246 Starter Cable Loom Wiring 160 180 CDI Diesel A2465405833

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2055455100

Mercedes W205 W213 C238 Power Distribution Unit Busbar Connector A2055455100

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2048702126

Mercedes W204 Door Module Control Unit Module Front Right O/S A2048702126

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2479001306

Mercedes W177 W247 SAM Module Body Comfort Control Unit A2479001306

PLN 427.95

Free delivery - Mon, Nov 24

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Part no. A2075404107

Mercedes W204 M276 NOX Sensor Adapter Left N/S Harness Wiring Cable A2075404107

PLN 161.95

Free delivery - Mon, Nov 24

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Part no. A9075450100

Fuse Box Mercedes Sprinter W907 W910 Relay Box Fuse Box Module A9075450100

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A2048702626

Door Module Mercedes W204 Rear Right O/S Control Unit Module A2048702626

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A0999008701

Mercedes W177 Steering Column Control Module A0999008701

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A9079001403

Mercedes Sprinter W907 Module Control Unit Radar Sensor A9079001403

PLN 949.95

Free delivery - Mon, Nov 24

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Part no. A1695408033

Mercedes-Benz A W169 Front Driver's Side Door Wiring Loom Harness A1695408033

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2465405733

Wiring Harness Mercedes X156 W176 Petrol Battery To Starter Cable A2465405733

PLN 75.95

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Part no. A2218207502

Mercedes W221 Front Centre Dashboard Speaker Logic 7 A2218207502

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2515400524

Mercedes W251 Fuse Relay Electrical Box Housing Cover A2515400524

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2128204926

Mercedes W212 Crash Impact Air Module Sensor Front Unit A2128204926

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1725400035

Electrical Cable Mercedes R172 Transmission To Body Wiring Harness A1725400035

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2129003704

Parking Module Mercedes W207 W212 PDC Distance Control Unit Sensor A2129003704

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2229001408

Module Mercedes S205 Trunk Rear Tuner Digital Radio DAB Control Unit A2229001408

PLN 93.95

Free delivery - Mon, Nov 24

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Part no. A2058201201

Sunroof Wiring Mercedes C205 C238 Panoramic Motor Cable Harness A2058201201

PLN 75.95

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Part no. A2045400440

Battery Bracket Mercedes W204 W207 Battery Mount Support Holder A2045400440

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2059003222

Door Module Mercedes W205 W253 Control Unit Module Front Right O/S A2059003222

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2059006651

Mercedes C205 GLC C253 Body Control Comfort Module Unit SAM BCM A2059006651

PLN 949.95

Free delivery - Mon, Nov 24

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Part no. A2055404596

Mercedes W205 Electrical Ground Line Wire Earth Cable A2055404596

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2129004502

Mercedes W204 W207 Front Right Door Control Unit Module A2129004502

PLN 27.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129006518

Door Module Mercedes W204 W207 W212 Front Right O/S Control Unit A2129006518

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2045420623

Mercedes W204 Warning Device Parktronic Display Rear Sound Signal A2045420623

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A0035420219-2

Mercedes W639 W906 Relay 5-Pin Control Unit 12A Blue SET X2 A0035420219

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2049005601

Mercedes W204 S204 Estate SAM Control Unit Module Rear A2049005601

PLN 123.95

Free delivery - Mon, Nov 24

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Part no. A2118701885

Mercedes ML W164 Control Unit Module DC UHI MOST A2118701885

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2539059800

Mercedes W205 Lid Boot Trunk Tailgate Smart Opener Control Module A2539059800

PLN 161.95

Free delivery - Mon, Nov 24

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Part no. A1775405501

Mercedes W177 Door Harness Loom Cable Wiring Rear Left Right N/O/S A1775405501

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0025421419

Mercedes W163 W169 W203 W210 Relay 5-Pin Yellow TYCO A0025421419

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2079001200

Door Module Mercedes C207 W207 Front Right O/S Control Unit ECU A2079001200

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2129008816

Mercedes X218 Radio Comand Navigation Seat Control Unit Module A2129008816

PLN 1,044.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1698208626

Mercedes-Benz A B W169 W245 Door Control Module Right Rear O/S A1698208626

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2048704526

Door Module Mercedes W204 Rear Left N/S Control Unit Module A2048704526

PLN 56.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129008707-1

Mercedes W212 Display Screen Multifunction Dashboard Control Unit A2129008707

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A1728202989

Mercedes SLK R172 Roadster Antenna Amplifier Control Module A1728202989

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A1179001702

Mercedes GLA X156 Interior SRS Air Module Seat Belt Tensioner A1179001702

PLN 379.95

Free delivery - Mon, Nov 24

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Part no. A2055405203

Mercedes W205 Negative Cable Battery Lead Minus Pole Wiring A2055405203

PLN 104.95

Free delivery - Mon, Nov 24

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Part no. A2469009512

Multimedia Switch Mercedes X156 C117 W176 CD Player Radio Head Unit A2469009512

PLN 569.95

Free delivery - Mon, Nov 24

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Part no. A2059068501-1

Fuse Box Mercedes W205 S205 W213 Fuse Box Front Relay Control Module A2059068501

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2128300008

Fan Blower Mercedes W212 Comand Navi CD Control Unit Module Cooler A2128300008

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A6519007500-13

Mercedes W212 E250 CDI 651.924 204HP Engine Unit ECU Kit A6519007500 Key Lock

PLN 1,139.95

Free delivery - Mon, Nov 24

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Part no. A2218201811-2

Mercedes W221 Bluetooth Hands Free Mobile Phone Adapter Connector A2218201811

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A4475402105

Mercedes Vito W447 Battery Cable Starter Alternator Wiring Harness A4475402105

PLN 132.95

Free delivery - Mon, Nov 24

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Part no. A1776204201

Mercedes C118 W177 W247 Battery Box Trim Housing Cover Support A1776204201

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2098209610

Mercedes CLK W209 Convertible Alarm Anti Theft System Control Unit A2098209610

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2059009643

Mercedes W205 Telematics Bluetooth Module Control Unit ECU A2059009643

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. rhd-A1185407902

Mercedes C118 Front Door Left Right N/O/S Electrical Wiring Harness A1185407902

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A1729002301

Mercedes SLK R172 Door Control Unit Module Front Left N/S A1729002301

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2761509875

Mercedes W213 W222 A238 M276 Starter Screening Plate Shield A2761509875

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A9065400041

Mercedes Sprinter W906 Battery Cable Negative Lead Wiring Harness A9065400041

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1698207926

Mercedes W169 W245 Control Unit Front Left Door N/S Module A1698207926

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2049005410

Mercedes W204 Sat Nav Radio CD Player Radio Head Unit A2049005410

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A2229002112

Door Module Mercedes W205 GLC C253 Control Unit Rear Right O/S A2229002112

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1568200089

Mercedes W176 W246 Tailgate Aerial Antenna Amplifier Unit A1568200089

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009822923-1

Mercedes W177 W205 W247 Relay Fuse Unit Module 4 Pins Grey SET X2 A0009822923

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A2118704926

Seat Module Mercedes W164 W203 W211 C219 Front Memory Control Unit A2118704926

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009003101

Mercedes W204 W212 W221 Fuel Pump Module Control Unit A0009003101

PLN 123.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0005459812

Mercedes Vito W447 W213 OM654 Power Distribution Relay Unit Module A0005459812

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A2059008118

Telematics Module Mercedes W176 W205 W218 Communication Control Unit A2059008118

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2044402232

Mercedes W204 W207 Battery Cable Positive Wiring Harness Loom A2044402232

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A0025421519

Mercedes-Benz M-Class ML W163 Relay 4-Pin Black Hella A0025421519

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1695453740

Mercedes-Benz A-Class W169 Fuse Box Unit Holder Bracket Frame A1695453740

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129009908

Mercedes SLK R172 Fuse Box Relay Control Unit SAM Module A2129009908

PLN 474.95

Free delivery - Mon, Nov 24

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Part no. A2078203426

Mercedes W204 C207 Rain Sensor Light Control Unit Front Windscreen A2078203426

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2465408109

Door Wiring Mercedes W176 Loom Cable Rear Left Right N/O/S A2465408109

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A9075400186

Mercedes Sprinter W907 Battery Cable Alternator Wiring Loom Harness A9075400186

PLN 360.95

Free delivery - Mon, Nov 24

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Part no. A0065454601

Energy Distributor Mercedes W204 OM656 Power Control Unit Module A0065454601

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A9068203526

Door Module Mercedes Sprinter W906 Front Right O/S Control Unit ECU A9068203526

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2139005613

Mercedes W213 Front Door Module Right O/S Control Unit A2139005613

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A0038207926

Door Module Mercedes W221 Door Control Unit Module A0038207926

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A2909003001-1

Mercedes C238 Transfer Case Torque Distribution Control ECU E53 4matic

PLN 949.95

Free delivery - Mon, Nov 24

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Part no. A9075407160

Mercedes W907 W910 Battery Electrical Wiring Harness Ground Line A9075407160

PLN 123.95

Free delivery - Mon, Nov 24

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Part no. A2218203375

Mercedes W221 Bluetooth Antenna AMP Amplifier Module A2218203375

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2098200326

Mercedes C209 Body Control Module Unit Temic 376 800 GZ A2098200326

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

...

Showing 694-792 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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