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. A2466200028

Mercedes W176 Battery Support Holder Bracket Mount A2466200028

€23.95

Free delivery: Mar 6 – 11

If paid before 14:00

Part no. A0025422619-2

Mercedes ML W163 Relay 4-Pin Grey Tyco Set Kit A0025422619

€23.95

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Part no. 6977982-2

Mini Cooper R50 R53 R56 R57 R60 Relay No Contact Taubenblau Blue Set 2X 6977982

€23.95

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Part no. 9198302

BMW F10 F11 F20 F21 F30 F31 130A Electric Fan Motor Relay 9198302

€23.95

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Part no. 2GA035284A

Seat Ibiza KJ1 VW Polo MK6 Online Services Control Module ECU Unit 2GA035284A

€132.95

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Part no. 95B907553T

Porsche Macan 95B Air Suspension Control Module Unit ECU 95B907553T

€237.95

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Part no. A4148200526

Mercedes Vaneo W414 Front Left Right Door N/O/S Control Unit Module A4148200526

€23.95

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Part no. 8D0907539

Audi A3 8L A4 B5 Windscreen Sunlight Sun Light Solar Sensor Unit 8D0907539

€23.95

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Part no. 95B971030FP

Porsche Macan 95B Door Wiring Harness Loom Cable 95B971030FP

€66.95

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Part no. 8K0907064HE

Audi A4 B8 Body Control Module BCM Comfort Control Unit 8K0907064DP

€23.95

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Part no. 7N0959794

Skoda Yeti 5L Door ECU Module Control Unit Rear Right O/S 7N0959794

€23.95

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Part no. 5G4971694B

Volkswagen Golf Mk7 Rear Door Wiring Harness Cable Right O/S 5G4971694B

€37.95

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Part no. 7641652-1

Engine Wiring BMW F10 F31 F32 N20 Engine Sensor Module 1 Harness 7641652

€47.95

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Part no. 6824129

Inverter Wiring BMW F45 Mini F60 Hybrid High Voltage Battery Cable Loom 6824129

€70.95

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Part no. 4H0971142C

Audi A8 D4 Door Card Wiring Loom Cable Harness Rear Right O/S 4H0971142C

€23.95

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Part no. 9367376

Control Unit BMW F01 F02 F07 F10 F11 CAS4 Key Reading Module 9367376

€66.95

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Part no. 9370431

BMW X1 Series F48 KaFAS Camera Assist Speed Limit Control 9370431

€47.95

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Part no. 7286050

BMW F20 Control Unit Module Wing Mirror Power Fold 7286050

€66.95

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Part no. 9348763

BMW 3 4 Series F30 F80 M3 F82 M4 Battery Cable Lead Positive Underfloor 9348763

€113.95

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Part no. A2129007024

Mercedes CLS C218 Front Fuse Relay Box On Board Supply A2129007024

€75.95

Free delivery: Mar 6 – 11

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Part no. 9221109-2

BMW E60 Body Gateway Module Control Unit KGM E6X High D-Can Lear 9221109

€23.95

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Part no. 6953467

BMW 1 3 Series E88 E93 Convertible Tel Phone Antenna Aerial 6953467

€23.95

Free delivery: Mar 6 – 11

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Part no. A0131541002-2

Mercedes Vito Viano W639 Alternator Generator Diesel 200A A0131541002

€142.95

Free delivery: Mar 6 – 11

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Part no. 2992478-3

Plug Socket BMW X1 E84 Rear Light In The Side Panel Right O/S Wiring 6984754

€23.95

Free delivery: Mar 6 – 11

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Part no. A2205400382

Mercedes CL S Class C215 W220 Fuse Box Unit Front Right O/S Cover A2205400382

€28.95

Free delivery: Mar 6 – 11

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Part no. 9228914

Radio CD Player BMW F10 F11 F13 Navigation ECE Sat Nav Head Unit 9228914

€284.95

Free delivery: Mar 6 – 11

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Part no. 6977982-3

Mini Cooper R50 R53 R56 R57 R60 Relay No Contact Taubenblau Blue Set 4X 6977982

€23.95

Free delivery: Mar 6 – 11

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Part no. A1729000302

Mercedes R172 PDC Parking Distance Sensor Control Module Unit A1729000302

€23.95

Free delivery: Mar 6 – 11

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Part no. 9113064

BMW 5 Series E60 E61 LCI Centre Console Switch Cluster Control Unit ECU 9113064

€23.95

Free delivery: Mar 6 – 11

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Part no. 9811260

BMW Mini Cooper R60 Wiring Passenger Loom Front Door Cables Left N/S 9811260

€23.95

Free delivery: Mar 6 – 11

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Part no. 03E906019M-2

Volkswagen Polo 6R 1.2 Petrol CGPB 60HP Engine Control ECU Kit 03E906019M Manual

€161.95

Free delivery: Mar 6 – 11

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Part no. 9117877

BMW F20 F21 F30 F31 F32 F33 Negative Minus Pole IBS Battery Lead Cable 9117877

€23.95

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Part no. AV1T-17D547

Ford Fiesta Mk7 Windscreen Rain Sensor AV1T17D547

€23.95

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Part no. 5B44733

BMW X3 G01 X4 G02 Driver's Seat Control Unit Module Memory Heated 5B44733

€161.95

Free delivery: Mar 6 – 11

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Part no. CPLA-18K891-AA

Range Rover L405 Radio Isolator Module Unit CPLA-18K891-AA

€23.95

Free delivery: Mar 6 – 11

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Part no. 5G4971693B

Volkswagen Golf Mk7 Rear Door Wiring Harness Cable Left N/S 5G4971693B

€37.95

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Part no. 9315130

Door Wiring Harness BMW F25 Rear Left Right Door N/O/S Wiring Loom 9315130

€28.95

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Part no. 7607454

Battery Insert BMW F13 F12 F06 Battery Crashpad Foam Insulator 7607454

€23.95

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Part no. A2479002707

Communication Module Mercedes W177 W247 Hermes LTE Control Unit A2479002707

€51.95

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Part no. 9227766

BMW F11 Touring Tailgate Spoiler Probe AM/FM Sensor 9227766

€23.95

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Part no. a0045468040

Mercedes W204 W212 W221 Power Distributor Box Conectors Socket A0045468040

€23.95

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Part no. A2059067200-1

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

€28.95

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Part no. A0009003606

Mercedes W176 W246 Automatic Transmission Control Uni A0009003606

€23.95

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Part no. 6906626

Mini R50 R52 R53 Fuse Box Housing Electrical Power Distribution Box 6906626

€23.95

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Part no. TM450

Trafficmaster TM450 GPS Vehicle Location Tracker Control Unit Module ECU

€23.95

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Part no. A0051513901

Kompressor Mercedes W203 W211 M271 Petrol Engine Starter Motor A0051513901

€23.95

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Part no. 7350697-2

BMW X1 F48 Rear Light Lamp Trunk Tailgate Left N/S Loom Harness Wiring 7350697

€23.95

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Part no. 1508937

BMW Mini Cooper S One D R50 R52 R53 Negative Battery Cable Wire 1508937

€23.95

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Part no. 1Q0955557

Volkswagen VW Polo 6R Air Module Control Unit Crash Impact Sensor 1Q0955557

€23.95

Free delivery: Mar 6 – 11

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Part no. 5Q0971230AQ

Seat Leon 5F VW Golf Mk7 Alternator Wiring Harness Loom Cable 5Q0971230AQ

€23.95

Free delivery: Mar 6 – 11

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Part no. 4M0959793H

Audi A5 F5 A4 B9 Front Door Control Module Unit ECU Driver's Side 4M0959793H

€28.95

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Part no. A2829003300

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

€37.95

Free delivery: Mar 6 – 11

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Part no. 6C0907159B

Volkswagen Polo 6C Body Sound Impact Control Module ECU 6C0907159B

€23.95

Free delivery: Mar 6 – 11

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Part no. 8518568-3

BMW F20 F30 120d 320d ed Diesel N47N 163HP ECU Kit DDE 8518568 + Key + FEM

€132.95

Free delivery: Mar 6 – 11

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Part no. 7N0959792

Skoda Yeti 5L Door Control Unit Module ECU Passenger's Side 7N0959792F

€23.95

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Part no. 9294309

Dashboard Monitor BMW X3 F25 X4 F26 Onboard Central Display Screen 6,5" 9294309

€189.95

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Part no. AA6T-14B321-BA

Ford Fiesta Mk7 VI Air Module ECU Module Control Unit SRS AA6T-14B321-BA

€42.95

Free delivery: Mar 6 – 11

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Part no. A0009059101

Mercedes-Benz E-Class W207 W212 ESP Yaw Rotation Rate Sensor A0009059101

€23.95

Free delivery: Mar 6 – 11

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Part no. 8N7907953

Audi TT 8N Wind Brake Relay Unit Module 8N7907953

€23.95

Free delivery: Mar 6 – 11

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Part no. 8P7035223A

Audi A3 8P Convertible Audio Amplifier Unit Control Unit Module Bose 8P7035223A

€32.95

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Part no. 6989080-OLI

BMW E65 E66 E67 PDC Rear Parking Sensor Ultrasonic Olivin Metallic

€28.95

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Part no. 8617050-4

Mini Cooper R56 LCI R58 R59 N16 1.6 122HP Engine ECU DME 8617050 Manual

€146.95

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Part no. 8489449-3

BMW F30 F31 LCI F32 320iX B48 184HP Engine Control ECU Kit DME 8489449 Automatic

€436.95

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Part no. 9805461

Mini Countryman R60 Front Door Wiring Loom Harness Cable Right O/S 9805461

€23.95

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Part no. GK2T-6M091-AB

Ford Transit Mk8 2.0 Ecoblue Diesel Glow Plug Wiring Loom GK2T-6M091-AB

€23.95

Free delivery: Mar 6 – 11

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Part no. 9128602

Cables Wiring BMW E81 E87 LCI Front Bumper PDC Loom Set 9128602

€32.95

Free delivery: Mar 6 – 11

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Part no. 6952477

BMW 5 Series E60 E61 Centre Console Switch Centre DTC PDC 6952477

€23.95

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Part no. 9237055

Antenna Diversity BMW F07 GT Control Unit Module Aeral Amplifier 868 MHZ 9237055

€23.95

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Part no. 9231466

BMW 2 3 4 Series F22 F30 F32 Antenna Amplifier Module Trap Circuit 9231466

€23.95

Free delivery: Mar 6 – 11

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Part no. 3Q1959435C

Seat Ibiza KJ1 Keyless Go Control Unit Module ECU 3Q1959435C

€142.95

Free delivery: Mar 6 – 11

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Part no. 7P0907311-1

Volkswagen Touareg 7P 3.0 TDI CASD 204HP Engine Unit ECU Set 7P0907311 Automatic

€693.95

Free delivery: Mar 6 – 11

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Part no. 5K0959655D

Volkswagen VW Golf Mk6 5K Skoda Yeti 5L Air Module Control Unit ECU 5K0959655D

€23.95

Free delivery: Mar 6 – 11

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Part no. A0009050254

Mercedes W212 Negative Battery Cable Terminal Wiring A0009050254

€23.95

Free delivery: Mar 6 – 11

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Part no. 9213374

Mini R55 R56 R57 Cover Power Distribution Fuse Box 9213374

€23.95

Free delivery: Mar 6 – 11

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Part no. A2218702989

Mercedes C216 W221 R230 TV Tuner Video Control Unit Module A2218702989

€170.95

Free delivery: Mar 6 – 11

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Part no. 420959655

Audi R8 42 Air Module Sensor Control Unit ECU 420959655

€89.95

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Part no. 8U0907468AQ

Audi A1 8X Central Gateway Control Unit Module Relay ECU 8U0907468AQ

€23.95

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Part no. 8510591-7

BMW X1 E84 2.0d N47 177HP sDrive Engine Control Unit ECU DDE 8510591 Manual

€189.95

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Part no. 7174403-5

BMW E92 Coupe Rear Light Lamp Plug Socket Wiring Left N/S 6984754

€23.95

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Part no. A2709060500

Ignition Coil Mercedes W176 W204 C207 W212 Petrol Cable Connector A2709060500

€23.95

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Part no. 9337807

Door Speaker BMW F15 F16 Front Rear Loudspeaker HiFi Audio Speaker 9337807

€23.95

Free delivery: Mar 6 – 11

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Part no. BK2T18D815GD-1

Ford Transit Custom MK8 Radio Stereo Audio USB Head Unit Panel BK2T18D815GD

€42.95

Free delivery: Mar 6 – 11

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Part no. 6825541

BMW F20 F21 F22 F30 F32 Front Electronic Module Control Unit FEM 6825541

€99.95

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Part no. 3451779

Mini Cooper One R55 R56 Air Module ECU Control Unit 3451779

€28.95

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Part no. 8E0959643B

Audi A4 B7 Crash Impact Airbag Sensor Unit Module 8E0959643B

€23.95

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Part no. A2215401833

Mercedes W221 Door Harness Left Right N/O/S Rear Door Wiring Loom A2215401833

€23.95

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Part no. 7239175-1

BMW F30 F80 M3 Battery Cover Trunk Trim Panel Right Boot 7239175

€32.95

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Part no. 8P4971036J

Audi A3 8P Front Left N/S Door Harness Cable Loom 8P4971036J

€28.95

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Part no. 9113355

BMW E87N E90 E91 Mini Cooper R56 DC/DC Torque Converter Wandler 9113355

€23.95

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Part no. 8W6971036G

Audi A4 B9 A5 F5 Front Door Wiring Harness Cable Passenger Side 8W6971036D

€42.95

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Part no. 6882969

BMW F20 F21 F30 F31 ECU ICM Plus Control Unit Module Air Module 6882969

€32.95

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Part no. 8K0959663H

Porsche Macan 95B Start Stop Voltage Stabilizer Converter Module 8K0959663H

€37.95

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Part no. 5Q0937615C-2

Seat Leon Mk3 5F Fuse Relay Box Module Electrical Control Unit 5Q0937615C

€23.95

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Part no. 03L906018NF

Volkswagen Caddy 2K III 2.0 TDI CFHC 140HP Engine Control ECU 03L906018NF Manual

€132.95

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Part no. 8K0959793D

Audi A4 B8 A5 S5 8T Door Module Control Unit Front Left N/S 8K0959793D

€23.95

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Part no. 420941824

Audi R8 42 Spyder Fuse Box Battery Terminal Cover Housing Clamp 420941824

€32.95

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Part no. 8W9971104M

Audi A4 B9 Rear Bumper PDC Parking Sensor Harness Wiring Loom Cable 8W9971104M

€47.95

Free delivery: Mar 6 – 11

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Part no. 6863389

BMW F20 F21 F30 F31 ECU ICM Plus Control Unit Module Airbag 6863389

€23.95

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Part no. 9390835

Sound Amplifier BMW X5 F15 X6 F16 Active Harman Becker Design 9390835

€37.95

Free delivery: Mar 6 – 11

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Showing 2575-2673 of 13740 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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