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. 7811111

BMW X3 E83 LCI 2.0d N47 177HP Engine Module ECU Kit DDE 7811111 Automatic

€336.95

Free delivery: Mar 10 – 13

If paid before 14:00

Part no. 7700844253

Renault Relay Module Control Unit Yellow 12V 40A 5 Pins 7700844253

€23.95

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Part no. 6915943

BMW 7 X3 Z4 Series E65 E66 E83 E85 E86 Interface Japan Luggage Module 6915943

€94.95

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Part no. A0018209126

Mercedes CLC CLK Class CL203 W203 C209 Crash Sensor A0018209126

€23.95

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Part no. A1775401910

Mercedes W177 Door Wiring Rear Door Left N/S Module Harness Cables A1775401910

€28.95

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Part no. 4E0959655K

Audi A8 4E S8 D3 SRS Bag Control Air Module Unit Bosch 4E0959655K

€23.95

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Part no. 198393-01

Volkswagen Polo 6R Light Lamp Control Module Unit ECU 198393

€23.95

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Part no. 4H0035446A

Audi A7 4G Antenna Signal Amplifier Control Unit ECU 4H0035446A

€23.95

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Part no. 8E0035195M

Audi A4 B7 Convertible Symphony CD Changer Radio Head Unit 8E0035195M

€75.95

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Part no. 9462544

BMW F20 F30 F31 Mini F55 F56 F60 Control Unit Air Conditioning Module 9462544

€23.95

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Part no. 8U0971030AF

Audi Q3 8U Front Door Wiring Harness Loom Cable Passenger Side 8U0971030AF

€32.95

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Part no. 2GA971694A

VW Volkswagen T-Roc Mk1 Rear Door Cable Harness Wiring Loom Right O/S 2GA971694A

€32.95

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Part no. 80A941823A

Audi Q5 FY Positive Battery Terminal Potential Distributor 80A941823A

€56.95

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Part no. 4H0937517

Audi A8L 4H Fuse Relay Battery Junction Box Housing 4H0937517

€66.95

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Part no. 9362351-1

Mini F55 F56 BMW F45 i3 I01 Head Unit Radio DAB Media Player Unit 9362351

€94.95

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Part no. 8704090

BMW F20 F21 F30 Mini F55 F56 HSD Cable HU CID Wiring Cable 8704090

€32.95

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Part no. 8R0907468L

Audi A5 8F Gateway Control Unit Module ECU 8R0907468L

€23.95

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Part no. 09D927750FA

Volkswagen Touareg 7L Automatic Gearbox Module Control Unit ECU 09D927750FA

€32.95

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Part no. 9852926

BMW F31 X5 F15 Mini F60 Electric Tailgate Bootlid Control Unit Module 9852926

€61.95

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Part no. A2129001711

Mercedes W212 PDC Parking Distance Control Unit Module Sensor A2129001711

€23.95

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Part no. 9389286

Door Wiring Mini Clubman F54 Front Passanger Side N/S Door Harness 9389286

€32.95

Free delivery: Mar 10 – 13

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Part no. BS7T-14K131-AA

Land Rover Discovery Sport L550 Fuse Relay Box BS7T-14K131-AA

€23.95

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Part no. 4H0907182H

Audi A8 D4 4H Front Seat Backrest Control Module Unit ECU 4H0907182H

€23.95

Free delivery: Mar 10 – 13

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Part no. 03L906018BP-1

Skoda Yeti Mk1 2.0 TDI 110HP CFHA Engine Control Unit ECU 03L906018BP Manual

€70.95

Free delivery: Mar 10 – 13

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Part no. A2465400140

Mercedes-Benz A-Class W176 Equipment Electrical Cover Fuse Box A2465400140

€23.95

Free delivery: Mar 10 – 13

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Part no. 8602123

BMW i3 I01 Hybrid Electric Earth Ground Cable Line Strap Battery Lead 8602123

€23.95

Free delivery: Mar 10 – 13

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Part no. A2038206426

Mercedes-Benz C-Class W203 Front Right Door O/S Control Unit Module A2038206426

€23.95

Free delivery: Mar 10 – 13

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Part no. 7356250

BMW E92 LCI Coupe Mini R56 R57 Xenon Headlight Ballast Headlamp Control 7356250

€23.95

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Part no. 7795485

BMW X1 E81 E84 E87 E90 E91 Earth Cable Battery Cable 7795485

€23.95

Free delivery: Mar 10 – 13

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Part no. 8634246

Mini F54 F60 B42 B46 B48 Ignition Injection Valve Wiring Harness Loom 8634246

€47.95

Free delivery: Mar 10 – 13

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Part no. 6900583-1

BMW 7 Series E65 E66 Cable Wire Power Distribution Box 6900583

€23.95

Free delivery: Mar 10 – 13

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Part no. 3D0909601F

VW Volkswagen Touareg 7L Air Module Control Unit ECU SRS 3D0909601F

€23.95

Free delivery: Mar 10 – 13

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Part no. 8X0959795D

Audi A1 8X Rear Door Module Left N/S Control Unit ECU 8X0959795D

€23.95

Free delivery: Mar 10 – 13

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Part no. A1408207126

Mercedes C140 Blinker Hazard Trailer Relay Module Control Unit A1408207126

€227.95

Free delivery: Mar 10 – 13

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Part no. 9244189

BMW F20 F21 F30 F31 Telematics Module Bluetooth Combox Telematik ECU 9244189

€23.95

Free delivery: Mar 10 – 13

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Part no. 9251487-1

BMW E88 Cabrio Footwell Light Module Control Unit ECU BASIS PL2 FRM3R 9251487

€170.95

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Part no. 7661503

Battery Cable Relay BMW E60 E64 E82 E90 Electrical Unit 7661503

€23.95

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Part no. 9143439

BMW E81 E87 E90 E91 E92 6-disc CD Changer without Magazine 9143439

€47.95

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Part no. 7PP907064LA

Porsche Macan 95B Body Comfort Module Control Unit 7PP907064LA

€237.95

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Part no. A2038270642

Mercedes-Benz CLC-Class CL203 Antenna Amplifier Rear Right O/S A2038270642

€23.95

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Part no. 141951253B-4

Audi VW Volkswagen Seat Relay Number 53 Unit Module 4 Pins Set Of 4 141951253B

€23.95

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Part no. 7619250

Alternator Bracket BMW F10 F20 F22 F30 F32 LCI G30 B47 Supporting Mount 7619250

€23.95

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Part no. 7804110

BMW 5 Series F10 F11 LCI Earth Cable Battery Cable 7804110

€23.95

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Part no. 8677247-1

Mini Countryman F60 Cooper Cable Alternator Starter Wire 12428677247 8677247

€23.95

Free delivery: Mar 10 – 13

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Part no. A2055409591

Mercedes W205 Door Wiring Loom Harness Cable Rear Right Left N/O/S A2055409591

€56.95

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Part no. 6C1T14B056AE-1

Ford Transit MK7 Air Module ECU Control Unit 6C1T14B056AE

€23.95

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Part no. 8368932

BMW E39 Alarm Sensor Comfort Control Module Unit ECU 55892110

€23.95

Free delivery: Mar 10 – 13

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Part no. 9350003

Safety Control Unit BMW F01 LCI F07 F10 F11 F25 Air Module Bag ECU 9350003

€23.95

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Part no. A2049009301

Mercedes W212 Media Interface Control Unit Module Multimedia A2049009301

€28.95

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Part no. 9267214

BMW F20 F21 F22 F30 F31 F32 F33 F34 Air Control Unit Module ECU 9267214

€23.95

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Part no. A0001502780

Mercedes W203 CL203 W204 M272 Petrol Ignition Coil Cable Connector A0001502780

€23.95

Free delivery: Mar 10 – 13

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Part no. 8589168

Alternator Harness BMW X3 G01 X4 G02 30dX 40dX B57 Cable Base B+ Loom 8589168

€56.95

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Part no. A2118701310

Mercedes W221 Hood Bonnet Light Solar Sensor Module Unit A2118701310

€28.95

Free delivery: Mar 10 – 13

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Part no. 4M0035507

Audi A3 8V A4 B9 Telephone Antenna Amplifier Module Unit Booster 4M0035507

€23.95

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Part no. 5WA980653D

Volkswagen Golf CD1 Camera Lane Assist Control ECU Module Unit 5WA980653D

€89.95

Free delivery: Mar 10 – 13

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Part no. 8P0906131A

Audi A3 8P Engine Unit Bracket ECU Module Holder Bracket Mount 8P0906131A

€23.95

Free delivery: Mar 10 – 13

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Part no. 8507202

BMW E90 E91 LCI 318d N47N 143HP ECU Engine Control Unit DDE 8507202 Manual

€61.95

Free delivery: Mar 10 – 13

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Part no. A9075402605

Mercedes W907 Fuse Box Control Unit Module Q2 A9075402605

€61.95

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Part no. 6824117G

Mini F60 Hybrid High Voltage Battery Wiring Loom Harness 6824117G

€32.95

Free delivery: Mar 10 – 13

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Part no. 8F0959655C

Audi A5 8F Cabrio Air Module Control Unit ECU Crash Control Sensor 8F0959655C

€28.95

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Part no. 9233009

BMW F33 F83 M4 Convertible DWA-Alarm System Module Unit ECU 9233009

€23.95

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Part no. 6949228-2

4 x Mini Cooper R52 Convertible DWA Door Alarm System Module Unit Set 6949228

€28.95

Free delivery: Mar 10 – 13

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Part no. 8N0906018BH

Audi S3 8L 1.8T BAM Quattro 225HP Petrol Engine Unit ECU 8N0906018BH Manual

€379.95

Free delivery: Mar 10 – 13

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Part no. A2055401492

Mercedes W205 Door Wiring Harness Door Control Loom Front Left N/S A2055401492

€104.95

Free delivery: Mar 10 – 13

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Part no. 06D903016A

Audi A4 B7 Alternator Generator Unit 140A 14V 1.8 2.0 Petrol Engine 06D903016AB

€28.95

Free delivery: Mar 10 – 13

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Part no. J9C3-70718-AS

Land Rover Discovery Sport L550 Telematics Bluetooth Module Unit J9C3-70718-AS

€99.95

Free delivery: Mar 10 – 13

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Part no. BH42-14D620-AA

Land Rover 4 L319 Rear Door Control Unit Module Left Right N/O/S BH42-14D620-AA

€23.95

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Part no. AH22-14D374-AG

Land Rover Discovery 4 L319 Air Module Control Unit AH22-14D374-AG

€23.95

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Part no. 4E0035785D-1

Audi A4 B8 A5 8T MMI Multimedia Interface Control Unit Module 4E0035785D

€123.95

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Part no. 9266350

BMW F01 F02 HiFi System Amplifier Harman Becker Audio Booster 9266350

€47.95

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Part no. 6808605

BMW F45 Mini F60 Air Con Pipe Pressure Hose Tube Compressor Evaporator 6808605

€37.95

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Part no. A1679001420

Central Locking Module Mercedes C118 W177 Door Lock Control Unit A1679001420

€70.95

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Part no. A1729008500-2

Mercedes W166 W204 Display Screen Information Navigation Dashboard A1729008500

€113.95

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Part no. 9362848

BMW 1 3 Series F20 F21 F30 F31 Bluetooth Teleservices GPS Telematics Module

€28.95

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Part no. 8517874-6

BMW F20 F21 116d N47N 116HP ECU Kit DDE 8517874 + Key + FEM + Lock Manual

€218.95

Free delivery: Mar 10 – 13

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Part no. 4H0951253A

Seat Skoda Audi VW Polo 6R Multi Use Control Module Relay 4 Pin 645 4H0951253A

€23.95

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Part no. A2218708326

Mercedes W221 Rear View Backup Camera Control Unit Module A2218708326

€56.95

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Part no. 7560377

Cable Alternator BMW E81 E82 E87 E88 E90 E91 LCI Starter B+ 7560377

€23.95

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Part no. 8573260-10

BMW F20 F21 116d Diesel N47N 116HP ECU Kit DDE 8573260 + Keys + FEM Manual

€332.95

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Part no. A0045425218

Mercedes W221 Blind Spot Radar Sensor Module Control Unit A0045425218

€208.95

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Part no. 6955116-BAQ

BMW 1 3 Series E81 E82 E87 E88 E90 E91 Ultrasonic Sensor PDC Barriquerot 6955116

€23.95

Free delivery: Mar 10 – 13

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Part no. 8200568535-1

Renault Master 3 Vauxhall Movano B 2.3 DCI Diesel Starter Motor 8200568535

€56.95

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Part no. 9139868-1

BMW X3 E83 LCI X5 E70 LCI PDC Parking Ultrasonic Sensor Black 9139868

€23.95

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Part no. 7611322

BMW F01 F02 F06 F07 F10 F11 F12 Positive Cable Battery Lead N55 Engine 7611322

€32.95

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Part no. 6926445

BMW 5 Series E60 E61 LCI Heated Front Seat Control Module 6926445 9182128

€32.95

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Part no. 8V4971030AD

Audi A3 S3 8V Front Door Wiring Harness Loom Cable Passenger Side 8V4971030AD

€61.95

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Part no. 8X0907159B

Audi A1 8X Fuel Pump Module Control Unit ECU 8X0907159B

€32.95

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Part no. Q0009493V003000000

Smart Fortwo C450 ESP YAW Rate Lateral Acceleration Speed Sensor 0265005671

€165.95

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Part no. 04E907309AF-3

Seat Ibiza FR IV 1.2 TSI CJZD 110HP Engine Control ECU Kit 04E907309AF Manual

€189.95

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Part no. 4H0035061J

Audi A8L 4H Head Unit Radio CD Player Navigation GPS 4H0035061J

€398.95

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Part no. A2045458401

Mercedes W204 Fuse Box Terminal Connection Unit A2115452301

€222.95

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Comfort Control Unit BMW F06 F10 F11 F12 F13 Junction Box 9286945

€51.95

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BMW F20 F21 F22 F30 F31 F32 F36 Body Control Module Unit FEM LR01 9383182

€199.95

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Part no. 8K0971228

Audi A4 B8 A5 8T Negative Battery Cable Starter Alternator Wiring 8K0971228

€56.95

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Part no. AH42-18C941-AG

Land Rover Discovery 4 L319 USB Audio Stereo Control Unit Module AH42-18C941-AG

€32.95

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Part no. LR036132

Range Rover L405 Engine Wiring Loom Harness Cable 4.4 Diesel CK52-9H589-AC

€218.95

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Part no. A2128204713

Seat Wiring Mercedes W212 Front Loom Harness Passenger Side A2128204713

€23.95

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Part no. A2059068501-1

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

€28.95

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Part no. 7580334

Earth Ground Cable BMW F10 F11 F13 F01 Battery Cable Engine Wiring 7580334

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Showing 5842-5940 of 13888 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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