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. 5A56078

Mini F55 F56 Ignition Lock Barrel Key Unit 5A56078

€47.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2479008607

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

€89.95

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Part no. A2479003216

Mercedes C118 W247 Head Unit Radio Sat Nav Navigation Control Unit A2479003216

€474.95

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Part no. 6931987

BMW 7 Series E65 E66 E67 Control Unit Voice Input System Module 6931987

€23.95

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Part no. 7805349-1

BMW X3 Series E83 LCI M47N2 2.0d 150HP ECU Kit DDE + EWS4 + Key 7805349 Manual

€313.95

Free delivery - Wed, Jan 14

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Part no. A2118201526

Mercedes S211 Rear Door Control Module Left N/S A2118201526

€23.95

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Part no. 8631833

Mini R55 R56 R57 LCI R60 Automatic Gearbox Basic Control Unit EGS 7356237

€37.95

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Part no. 7575579

BMW X5 X6 Series E70 E71 Cable Wiring Harness Rear Differential Axle 7575579

€28.95

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Part no. 7P0907652

Yaw Sensor Audi Q7 4L Rotation Rate Unit Module 7P0907652

€23.95

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Part no. 04L907309AB-1

Audi Q3 8U 2.0 TDI DFTA 150HP Quattro Engine ECU Kit Ignition + Key 04L907309AB

€161.95

Free delivery - Wed, Jan 14

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Part no. 8F0035399

Audi A5 8F Door Speaker Tweeter Front Left N/S 8F0035399

€23.95

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Part no. 80A907159

Audi SQ5 FY Control Unit Module Active Sound Design 80A907159

€85.95

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Part no. A2128204185

Mercedes W204 W212 Door Module Control Unit Module Rear Right O/S A2128204185

€23.95

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Part no. 7621168

BMW F20 F21 F30 F31 Earth Cable Battery Engine N47N N13 7621168

€23.95

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Part no. 8W1959595D

Audi Q5 FY Rear Door Control Module Unit Left Right N/O/S 8W1959595D

€23.95

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Part no. 5Q0907530AF

Volkswagen Seat Skoda Audi Gateway Control Unit Module ECU 5Q0907530AF

€23.95

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Part no. A0035421019

Relay Mercedes C117 GLA X156 ML W166 W176 W246 5 Pins Yellow A0035421019

€23.95

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Part no. 7789225

BMW E65 E66 730d M57N Diesel Cable Starter-Base B+ 7789225

€28.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9252640

Mini Cooper R55 R56 R57 R60 R61 Control Unit PDC Parking Sensor Module 9252640

€23.95

Free delivery - Wed, Jan 14

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Part no. 8635808-1

Engine Wiring BMW F20 F30 F31 LCI B38 Loom Module 2 Harness Cable 8635808

€75.95

Free delivery - Wed, Jan 14

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Part no. 1742690

BMW E60 E63 E87 E90 Relay Changer Make Contact Salmon Red 1742690

€23.95

Free delivery - Wed, Jan 14

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Part no. 6867932

BMW F20 F21 F23 Mini Cooper F55 F56 Control Unit Trailer Tow Hitch 6867932

€66.95

Free delivery - Wed, Jan 14

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Part no. 9266838

BMW X3 F15 Can Bus Interface 120Ohm Control Module Unit ECU 9266838

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 4H0907658B

Audi A3 8V A5 A6 A7 Air Quality Sensor Unit 4H0907658B

€23.95

Free delivery - Wed, Jan 14

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Part no. 7823314

Mini Cooper R55 R56 R57 LCI N47N 1.6 Diesel Engine Starter Motor 7823314

€23.95

Free delivery - Wed, Jan 14

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Part no. 03E971815A

Volkswagen Polo 6R Cover Wiring Loom Guide Bracket Trim 03E971815A

€23.95

Free delivery - Wed, Jan 14

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Part no. 9343687

BMW F01 LCI F07 F10 F11 F25 Safety Control Unit Air Module Bag ECU 9343687

€42.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 5K0959793C

Skoda Octavia RS 1Z Door Module Control Unit ECU 5K0959793C

€56.95

Free delivery - Wed, Jan 14

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Part no. 6C4971694E

VW Volkswagen Polo 6R Rear Door Cable Harness Wiring Loom Right O/S 6C4971694E

€23.95

Free delivery - Wed, Jan 14

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Part no. 4H0951253C-1

Volkswagen Polo 6R Tiguan 1T Multi Use Control Module Relay SET 4H0951253C

€23.95

Free delivery - Wed, Jan 14

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Part no. A1729060205

Mercedes SLK R172 Rear SAM Fuse Relay Box Control Unit Module A1729060205

€108.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. BK2T-19L540-BE

Ford Transit Custom Mk8 Door Wiring Loom Harness Right O/S BK2T-19L540-BE

€23.95

Free delivery - Wed, Jan 14

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Part no. 9251984

BMW F10 F11 F20 F21 F30 Control Unit Module Voltage Transformer VSU180 9233143

€23.95

Free delivery - Wed, Jan 14

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Part no. A2128203985

Mercedes W204 W212 Door Module Rear Left N/S Control Unit Module A2128203985

€23.95

Free delivery - Wed, Jan 14

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Part no. 8W0906259N-1

Audi A5 F5 45 TFSI DKNA 245HP Quattro Engine ECU Kit 8W0906259N Gateway + Key

€351.95

Free delivery - Wed, Jan 14

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Part no. A2129005327

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

€277.95

Free delivery - Wed, Jan 14

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Part no. A9079001403

Mercedes Sprinter W907 Module Control Unit Radar Sensor A9079001403

€237.95

Free delivery - Wed, Jan 14

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Part no. A2115458532

Mercedes W211 W219 Body Control Module Control Unit ECU A2115458532

€23.95

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Part no. 240720782R

Renault Trafic III VIvaro B Wiring Connector Additional Horn Cable 240720782R

€23.95

Free delivery - Wed, Jan 14

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Part no. 8K0959793J

Audi A4 B8 Door Module Front Right O/S Control Unit Module ECU 8K0959793J

€23.95

Free delivery - Wed, Jan 14

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Part no. A2439000800

Drivetrain Module Mercedes H243 Transmission Control Unit ECU A2439000800

€161.95

Free delivery - Wed, Jan 14

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Part no. 7589354

Mini R55 R56 R57 R59 R60 JCW Engine Starter Motor Actuator 7589354

€23.95

Free delivery - Wed, Jan 14

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Part no. 7542310

BMW Mini Cooper One R50 DME Petrol Engine Control Unit ECU Automatic 7542310

€28.95

Free delivery - Wed, Jan 14

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Part no. 7618644

BMW Z4 Series E89 Roadster Petrol N20 Cable Alternator-Starter-Base B 7618644

€23.95

Free delivery - Wed, Jan 14

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Part no. BK2T14A094BA

Ford Transit Mk8 Battery Fuse Box BK2T14A094BA

€51.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A1698700689-2

Mercedes W169 W245 CD Player Radio Stereo Head Unit A1698700689

€23.95

Free delivery - Wed, Jan 14

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Part no. 6949229-2

4 x Mini R52 Convertible DWA Door Alarm System Module Control Unit Set 6949229

€28.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A0009068706

Mercedes W205 C43 Alternator Generator VALEO 200A 3.0 Petrol A0009068706

€113.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 7520019

Mini Cooper One R50 Petrol W10 W11 Engine Control Unit DME 7520019 Automatic

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2129004518

Door Control Unit Mercedes W204 W207 W212 Front Left N/S Module ECU A2129004518

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 7801711-1

BMW X3 E83 2.0d M47N2 Engine Control Unit Module ECU DDE 7801711 Manual

€227.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2129004910

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

€118.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8K0971104Q

Audi A5 8T Rear Bumper PDC Parking Sensor Wiring Harness Loom 8K0971104Q

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2124407952

Battery Cable Mercedes W212 W218 Negative Lead Terminal Harness A2124407952

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. rhd-A1185407902

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

€28.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8365960

BMW E38 E39 E53 Battery Crash Disconnection Control Relay 8365960

€23.95

Free delivery - Wed, Jan 14

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Part no. A2469050201

Mercedes C117 X156 Antenna Amplifier Control Unit Module A2469050201

€32.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 2622610

Bluetooth Module BMW F10 F20 F23 F30 Teleservices GPS Telematics Control 2622610

€32.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9805533-1

Mini R60 Rear PDC Parking Sensor Royal Grey Metallic - A48 9805533 SET x2

€28.95

Free delivery - Wed, Jan 14

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Part no. 9154349

BMW MINI Clubman R55 Cable Wiring Loom Splitdoor Split Door Rear Left N/S

€23.95

Free delivery - Wed, Jan 14

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Part no. 7618677

Battery Lead Cable BMW E81 E84 E87 RR1 RR2 RR3 Negative IBS 7618677

€23.95

Free delivery - Wed, Jan 14

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Part no. 283930431R

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

€23.95

Free delivery - Wed, Jan 14

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Part no. 6904620

BMW 7 Series E65 E66 Diversity Antenna Tuner Amplifier Wiring 6904620

€23.95

Free delivery - Wed, Jan 14

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Part no. 4L0907290

Audi Q7 4L Gateway Convenience Module Unit Control ECU 4L0907290

€23.95

Free delivery - Wed, Jan 14

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Part no. 9286365

BMW X1 X2 Series F39 F48 Antenne AM Antenna Amplifier Cable 9286365

€23.95

Free delivery - Wed, Jan 14

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Part no. 9116801

Hands Free Module BMW E60 E90 Everest Motorola Non GPS Phone 9116801

€28.95

Free delivery - Wed, Jan 14

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Part no. 5WA980653C

Audi A3 S3 RS3 8Y Front Camera FAS Lane Assistance Control Unit 5WA980653C

€94.95

Free delivery - Wed, Jan 14

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Part no. 6964140

BMW 7 Series E65 E66 Control Unit Door Rear Passenger Side 6933264

€23.95

Free delivery - Wed, Jan 14

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Part no. 8K0971765E

Audi A4 B8 AdBlue Tank Wiring Harness Loom Cable 8K0971765E

€23.95

Free delivery - Wed, Jan 14

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Part no. A2129009916

Mercedes S212 Rear Tailgate Boot Trunk Lid Control Module Unit A2129009916

€23.95

Free delivery - Wed, Jan 14

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Part no. 9381086

Amplifier BMW F06 GT F10 F13 F15 Audi Control Unit Active Sound Design 9381086

€47.95

Free delivery - Wed, Jan 14

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Part no. 9267958

BMW F20 F30 MINI F56 Control Unit Air Conditioning Module 9267958

€23.95

Free delivery - Wed, Jan 14

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Part no. 8789891

BMW F87 M2 LCI Electric Front Bumper Wiring Harness PDC Loom Cable 8789891

€113.95

Free delivery - Wed, Jan 14

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Part no. 9115107-1

BMW X5 Series E70 E70N LCI Wiring Set Wash Water Container Cable Loom 9115107

€23.95

Free delivery - Wed, Jan 14

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Part no. 5WA959655J

Audi S3 8Y Air Module Control Unit SRS System ECU 5WA959655J

€66.95

Free delivery - Wed, Jan 14

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Part no. A2079011800

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

€56.95

Free delivery - Wed, Jan 14

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Part no. 7P6035730C

Skoda Superb Seat Ibiza 6J Bluetooth Interface Control Module ECU 7P6035730C

€47.95

Free delivery - Wed, Jan 14

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Part no. 4E0910441-1

AUDI A8 S8 D3 Reversing Camera Control Module Rear View Unit ECU 4E0910441

€132.95

Free delivery - Wed, Jan 14

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Part no. 8W1907064BL

Audi A4 B9 Body Control Module BCM Comfort Control Unit Power Supply 8W1907064BL

€189.95

Free delivery - Wed, Jan 14

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Part no. 8622032

BMW F20 F21 F30 F31 LCI Control Unit Box Cover Mudguard Flap Cap 8622032

€23.95

Free delivery - Wed, Jan 14

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Part no. 8638552

Supply Module BMW F90 M5 F91 M8 G05 G11 G30 Integrated Control Unit 8638552

€56.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8K1907115M

Audi A4 B8 A5 8T 1.8 TFSI CDHB 160HP Engine Control ECU 8K1907115M Automatic

€156.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A9079821100

Mercedes W910 Engine Hood Microswitch Cable Wiring Loom Harness A9079821100

€23.95

Free delivery - Wed, Jan 14

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Part no. 8482940

BMW F30 LCI G11 G30 Battery Cell Supervision Circuit Module Unit 8667593

€32.95

Free delivery - Wed, Jan 14

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Part no. A2215403110

Mercedes W221 Positive Battery Cable Wire A2215403110

€23.95

Free delivery - Wed, Jan 14

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Part no. 9270491-BS

PDC Parking Sensor BMW E70 LCI F07 F25 Ultrasonic Black Sapphire 9216207

€23.95

Free delivery - Wed, Jan 14

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Part no. 8P0035503M

Audi A3 8P Bluetooth Antenna Module Control Unit 8P0035503M

€23.95

Free delivery - Wed, Jan 14

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Part no. A2118703485

Mercedes W211 Door Module Rear Right O/S Control Unit ECU A2118703485

€23.95

Free delivery - Wed, Jan 14

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Part no. 6838610

BMW 1 Series F40 Aerial probe AM/FM Antenna 6838610

€23.95

Free delivery - Wed, Jan 14

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Part no. 4H0907247

Audi A6 4G Keyless Entry Aerial Antenna Control Unit Module 4H0907247

€23.95

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Part no. A2045407135

Earth Ground Cable Mercedes W204 C207 Line Strap Battery Lead A2045407135

€23.95

Free delivery - Wed, Jan 14

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Part no. 04L907309G-1

Volkswagen New Beetle 2.0 TDI CUUA 110HP Engine Unit ECU Kit 04L907309G Manual

€222.95

Free delivery - Wed, Jan 14

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Part no. 7N0959793

Skoda Yeti 5L Door Control Unit Module ECU Driver's Side 7N0959793

€23.95

Free delivery - Wed, Jan 14

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Part no. A0009053006

Battery Wire Mercedes W205 Negative Cable With Battery Sensor 48V A0009053006

€89.95

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Part no. 9186655

BMW 3 Series E92 Front Right O/S Driver Side Door Wire Wiring Loom 9186655

€23.95

Free delivery - Wed, Jan 14

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Part no. 7540203

BMW X5 Series E70 Control Unit DME Module Emergency Release Lock 7582630

€23.95

Free delivery - Wed, Jan 14

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Part no. 6966551

BMW 5 Series E60 E61 Front Door Wiring Loom Harness Passengers Side 6966549

€37.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9154413-1

BMW E93 LCI Convertible GPS Antenna Aerial Unit Module 9154413

€28.95

Free delivery - Wed, Jan 14

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Part no. 7853357

Engine Wiring BMW F87 M2 N55 Petrol Loom Module 1 Harness Cable 7853357

€170.95

Free delivery - Wed, Jan 14

If paid before 14:00

...

Showing 2179-2277 of 12466 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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