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. 6911038

BMW 3 X5 Series E46 E53 Airbag Side Impact Crash Sensor Bosch 6911038

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 6990109

BMW X3 E83 LCI Front Door Speaker Tweeter 6990109

€23.95

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Part no. A1695406945

Mercedes SLK R171 Gateway Control Unit Gateway Module ECU A1715405145

€32.95

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Part no. 9670855680

Peugeot Partner Diesel Glow Plug Wiring Loom Cable Wiring 9670855680

€23.95

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Part no. 9491419

BMW F45 F48 F15 F31 F36 Mini F60 Trunk Lid Automatic Lift Control Module 9491419

€32.95

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Part no. A2469005515

Mercedes W176 Rain Light Sensor Control Unit Front Windscreen Camera A2469005515

€37.95

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Part no. 8W0035192K

Audi A4 B9 Multimedia Stereo Sat Nav SD CD Player Radio Head Unit 8W0035192K

€284.95

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Part no. MB3T-14C574-PFB

Volkswagen Amarok NF Ford Ranger T9 Body Cable Wire Harness MB3T-14C574-PFB

€56.95

Free delivery - Wed, Jan 14

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Part no. A2048200189

Mercedes-Benz C E Class W204 W207 Aerial Antenna Amplifier Unit A2048200189

€23.95

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Part no. A0009055504-TNG

Mercedes W205 W212 Front Rear PDC Parking Distance Sensor Tenorite Grey - 755

€23.95

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Part no. A2125409110-1

Console Lightning Mercedes W212 Centre LED Selector Cable Wiring A2125409110

€23.95

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Part no. 8720302

BMW 1 3 Series F20 F31 LCI Telematics Control Unit Module ATM ECE 4G 8720302

€61.95

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Part no. 9353421

BMW F11 LCI Body Control Module Unit V7 PL6 JBBFE III 9353421

€32.95

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Part no. A1645400762

Mercedes W164 W211 C219 Tyre Pressure Monitor Control Unit Module A1645400762

€28.95

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Part no. 5Q0971250Q

Audi A3 S3 8V Negative Battery Terminal Earth Cable Lead Wiring 5Q0971250Q

€23.95

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Part no. A2139009406

Mercedes W213 Display Screen Information Navigation Dashboard A2139009406

€66.95

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Part no. 6909776

BMW X5 Series E53 Control Element Light Switch 6909776

€23.95

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Part no. A2661501233

Engine Wiring Mercedes W169 W245 M266 Petrol Cable Loom Harness A2661501233

€56.95

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Part no. 6772102

BMW X5 X6 E70 E71 Holder Bracket Actuator Unit 6772102

€23.95

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Part no. A1699000700

Mercedes A B Class W169 W245 Door Control Module Front Right O/S A1699000700

€23.95

Free delivery - Wed, Jan 14

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Part no. A2661538479-1

Mercedes W169 A150 Petrol M266.920 95HP Engine ECU Kit A2661538479 Automatic

€180.95

Free delivery - Wed, Jan 14

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Part no. 1K0937132F

Vw Golf 5 Audi A3 8P Seat Leon 1P1 Fuse Box Cover Trim Panel Housing 1K0937132F

€23.95

Free delivery - Wed, Jan 14

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Part no. 8383185

BMW X5 7 Series E38 E53 Control Unit Illuminated Door Handle 8383185

€23.95

Free delivery - Wed, Jan 14

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Part no. 9337880

BMW F20 F22 F30 Rear Electric Power Distribution Fuse Box 9337880

€23.95

Free delivery - Wed, Jan 14

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Part no. 7533100

Mini Cooper One R50 Petrol W10 Engine Wiring Loom Harness Module 7533100

€47.95

Free delivery - Wed, Jan 14

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Part no. A0005455916

Mercedes W204 Automatic Gearbox Transmission Module Unit ECU A0005455916

€28.95

Free delivery - Wed, Jan 14

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Part no. A1728200815

Mercedes W204 C207 Centre Console Aux Port Socket Plug Terminal A1728200815

€23.95

Free delivery - Wed, Jan 14

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Part no. 8T0907468D

Audi A4 B8 A5 8T Gateway Diagnostic Interface Control Unit Module ECU 8T0907468R

€23.95

Free delivery - Wed, Jan 14

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Part no. 6R0971349AP

VW Volkswagen Polo 6R 1.4 TSI Petrol Alternator Wiring Harness Loom 6R0971349AP

€23.95

Free delivery - Wed, Jan 14

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Part no. 8W0959655H

Audi A4 B9 RS5 F5 Air Module Control Unit SRS Sensor ECU 8W0959655H

€313.95

Free delivery - Wed, Jan 14

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Part no. 8586536-6

BMW F30 F32 LCI 335d 435d N57Z 313HP Control Unit ECU Kit DDE 8586536 FEM Key

€398.95

Free delivery - Wed, Jan 14

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Part no. 8K0915181H

Audi A1 8X Negative Minus Battery Terminal Cable 1.4 TFSI CAXA Petrol 8K0915181H

€23.95

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Part no. 8370933

BMW 3 5 6 Series E60 E61 E63 E90 Support Bracket Navigation Computer 8370933

€23.95

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Part no. 9352750

BMW X6 F16 F86 Camera Kafas Front Windscreen Camera Module 9352750

€51.95

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Part no. 8512499-1

BMW E81 E87 E90 E91 LCI N47 143HP Diesel ECU Kit DDE 8512499 Manual

€132.95

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Part no. 7391042

BMW F10 F30 X1 F48 Mini F54 Rear Tailgate Smart Opener Top Wire Sensor 7391042

€32.95

Free delivery - Wed, Jan 14

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Part no. A2229007109

SAM Module Mercedes C205 GLC X253 Coupe Rear Control Unit A2229007109

€28.95

Free delivery - Wed, Jan 14

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Part no. 6956746

BMW E81 E87 E90 LCI PDC Parking Ultrasonic Sensor Monaco Blue A35 6956746

€23.95

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Part no. 1388277

BMW E39 E46 E60 E61 E83 E90 E91 Switch Glove Box Light

€23.95

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Part no. 5WA971794R

VW Golf 8 1.5 eTSI HV Battery Positive Terminal Harness Cable Wiring 5WA971794R

€28.95

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Part no. 9364818

BMW Z4 E89 ECU Body Control Module Junction Box H2 PL2RR JBBFE IIIR 9364818

€218.95

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Part no. A4475400600

Mercedes Vito W447 Battery Cable Alternator Wiring Diesel OM651 A4475400600

€42.95

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Part no. 3D0971235AD

VW Volkswagen Phaeton Mk1 Battery Negative Terminal Wire Cable 3D0971235AD

€23.95

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Part no. 7579155

Engine Starter Motor BMW X5 E70 LCI F07 X6 E71 N55 Petrol Denso 7579155

€37.95

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Part no. A1729006609-2

Mercedes SLK R172 Radio CD Player Sat Nav Comand Head Unit A1729006609

€151.95

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Part no. A2055463100

Retaining Plate Mercedes W205 Relay Fuse Box Holder Bracket A2055463100

€23.95

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Part no. 8387568-1

BMW E65 Battery B Engine Compartment Terminal Point Cover 8387568

€23.95

Free delivery - Wed, Jan 14

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Part no. 9243896

Central Information Display BMW F10 F11 LCI Boardmonitor Screen 7" 9243896

€23.95

Free delivery - Wed, Jan 14

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Part no. A2225403150

Fuse Box Mercedes W205 Front Passenger Side Footwell Fuse Box A2225403150

€23.95

Free delivery - Wed, Jan 14

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Part no. A1715400107

Mercedes SLK R171 Window Lifter Lift Switch Cable Wiring Harness A1715400107

€23.95

Free delivery - Wed, Jan 14

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Part no. 6866986

BMW F01 F02 LCI F06 F10 F11 F13 ECU ICM Control Unit Module Airbag 6866986

€28.95

Free delivery - Wed, Jan 14

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Part no. 4752820

Positive Cable BMW F20 F21 Under Bonnet Battery Wiring Loom 4752820

€32.95

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Part no. A2761508800

Starter Cover Mercedes W205 W212 W213 M276 Heat Plate Motor Shield A2761508800

€23.95

Free delivery - Wed, Jan 14

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Part no. A2389009000

Air Module Mercedes A205 A238 A217 SRS Protection Control Unit A2389009000

€113.95

Free delivery - Wed, Jan 14

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Part no. A2059006651

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

€398.95

Free delivery - Wed, Jan 14

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Part no. 9266384

BMW 5 Series F10 F11 LCI Boardmonitor Central Information Display 7" 9266384

€56.95

Free delivery - Wed, Jan 14

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Part no. A0009009114

Mercedes W205 Air Conditioning Climate Control Module ECU A0009009114

€28.95

Free delivery - Wed, Jan 14

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Part no. 8573260-8

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

€417.95

Free delivery - Wed, Jan 14

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Part no. 3457490

Mini Cooper Paceman R61 High SPEG Fuse Distribution Box H4 3457490

€165.95

Free delivery - Wed, Jan 14

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Part no. 8510221-13

BMW E90 E91 LCI E92 325d Diesel N57 204HP ECU Engine Kit DDE 8510221 Automatic

€189.95

Free delivery - Wed, Jan 14

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Part no. 8635815

BMW F20 F30 LCI 118i 318i B38 Gearbox Wiring Loom Harness Cable 8635815

€32.95

Free delivery - Wed, Jan 14

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Part no. 6925330

Central Bass Speaker BMW E81 E87 E90 E91 E92 Stereo Audio Right O/S 6925330

€23.95

Free delivery - Wed, Jan 14

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Part no. 1439559

BMW X5 Series E53 Battery Cable Plus Pole 1439559

€23.95

Free delivery - Wed, Jan 14

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Part no. 6947786

BMW E60 E61 E63 E64 Steering Column Adjuster Switch 6947786

€23.95

Free delivery - Wed, Jan 14

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Part no. 6933162

BMW E65 E66 On-board Navigation Display Monitor Screen 8,8" 6933162

€47.95

Free delivery - Wed, Jan 14

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Part no. 6856314

BMW 1 3 Series F20 F21 F30 F31 ECU ICM Plus Control Unit Module Airbag

€37.95

Free delivery - Wed, Jan 14

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Part no. A9067601204

Mercedes Sprinter W906 Front Left Door N/S Handle Bowden Pull Cable A9067601204

€23.95

Free delivery - Wed, Jan 14

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Part no. A0009822923

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

€23.95

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Part no. A1668210351

Mercedes-Benz A CLA C117 W176 Airbag Impact Crash Sensor A1668210351

€23.95

Free delivery - Wed, Jan 14

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Part no. 4H0959655H

Audi A7 4G8 Air Module Control Unit ECU SRS Module Unit 4H0959655H

€23.95

Free delivery - Wed, Jan 14

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Part no. A2045405609

Video Wiring Cable Mercedes W204 Video Unit Harness Cable Wire A2045405609

€23.95

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Part no. 7587548-2

Mini Cooper S R55 R56 N14 1.6 174HP ECU Kit DME 7587548 CAS 3 + Key Manual

€474.95

Free delivery - Wed, Jan 14

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Part no. 9313992

BMW F13 Front Seat Control Module Unit ECU Left Right N/O/S 9313992

€51.95

Free delivery - Wed, Jan 14

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Part no. 9143823-1

BMW E88 E93 LCI ECU Air Control Unit Module Controller 9143823

€23.95

Free delivery - Wed, Jan 14

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Part no. 8R0907468T

Audi Q5 8R Gateway Module Control Unit ECU 8R0907468T 8R0907468C

€23.95

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Part no. 6864206

Air Module BMW F20 F21 F30 F31 F32 ECU ICM Plus Control Unit 6864206

€23.95

Free delivery - Wed, Jan 14

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Part no. 3456601-1

Mini Cooper One R55 R56 R57 LCI R60 Radio Boost CD Player Unit Head 3456601

€265.95

Free delivery - Wed, Jan 14

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Part no. A0005463704

Mercedes C118 Positive Pole Battery Insulating Cap Cover Trim A0005463704

€23.95

Free delivery - Wed, Jan 14

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Part no. F20 F30 PLUG SOCKET LOOM PDC

PDC Plug BMW F20 F22 F30 F32 Loom Socket Parking Sensor Wiring Harness

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2741501802

Mercedes W213 Engine Wiring Harness Cable Loom A2741501802

€180.95

Free delivery - Wed, Jan 14

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Part no. 6981416

BMW E87 E90 E91 CAS 2 Control Unit ECU Key Reading Module 6981416

€28.95

Free delivery - Wed, Jan 14

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Part no. 8376443

BMW X3 X5 Z4 E46 E53 E83 E85 Switch Cluster Steering Column 8376443

€23.95

Free delivery - Wed, Jan 14

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Part no. 7939168

Rain Sensor BMW F20 F21 F30 F31 Windscreen Light Solar Condensation Unit 7939168

€56.95

Free delivery - Wed, Jan 14

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Part no. 9181453

BMW 1 X4 X5 Series F20 F21 F25 F26 Antenna Aerial Diversity Trap Circuit 9181453

€23.95

Free delivery - Wed, Jan 14

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Part no. 9322122-1

Display Screen BMW F20 F21 F22 Central Information Sat Nav Monitor 6,5" 9322122

€37.95

Free delivery - Wed, Jan 14

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Part no. A4475400010

Mercedes Vito W447 Battery Cable Alternator Wiring Diesel OM651 A4475400010

€28.95

Free delivery - Wed, Jan 14

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Part no. 2GA035284B

Audi Q2 GA Online Services Control Module ECU Unit 2GA035284B

€142.95

Free delivery - Wed, Jan 14

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Part no. CK2T-6M091-AD

Ford Transit Custom 2.2 TDCi Glow Plug Wiring Loom Cable Wire CK2T-6M091-AD

€28.95

Free delivery - Wed, Jan 14

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Part no. 2432355

Ford Transit Custom Alternator 240A 14V 2.0 EcoBlue GK2T-10300-CC

€189.95

Free delivery - Wed, Jan 14

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Part no. 9383176

BMW F20 F30 F34 BCM FEM BSI Body Control Module Unit 9383176

€113.95

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Part no. 02Z911023H

Volkswagen VW Golf V 1.9 TDI Diesel Engine Starter Motor 02Z911023H

€32.95

Free delivery - Wed, Jan 14

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Part no. 8P0953519G

Audi TT 8J A3 8P Windscreen Wiper Stalk Switch Assembly 8P0953519G

€23.95

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Part no. 7446712

BMW F23 Cabrio Convertible Folding Top Roof ECU Control Unit CVM Module 7446712

€142.95

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Part no. 4H0959591A

Audi A8 D4 4H Sunroof Wind Deflector Module Control Unit 4H0959591A

€28.95

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Part no. A0009008709

Mercedes W213 Tyre Pressure Control Module Unit A0009008709

€28.95

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Part no. 8H0959655E

Audi A4 S4 B7 Cabrio Air Module Control Unit ECU Impact Sensor 8H0959655E

€23.95

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Part no. 9267085

Antenna Amplifier BMW F01 F10 F13 Aeral Diversity 868 MHZ Control Unit 9267085

€23.95

Free delivery - Wed, Jan 14

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Part no. 8583657

Wiring Harness BMW F20 E90 LCI Mini R56 LCI Engine Glow Plug Module 8583657

€23.95

Free delivery - Wed, Jan 14

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Part no. 8385157

BMW X3 E46 E83 LCI Start Point Housing Bracket Base B 8385157

€23.95

Free delivery - Wed, Jan 14

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...

Showing 1288-1386 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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