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. A2055403103

Alternator Starter Wiring Harness Mercedes W205 GLC C253 OM651 A2055403103

€28.95

Free delivery: Mar 10 – 11

If paid before 14:00

Part no. JK2T-14D453-AG

Ford Transit Custom Blind Spot Radar Sensor Rear Left Right N/O/S JK2T-14D453-AG

€189.95

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Part no. 03C906026AD

Audi A1 8X 1.4 TFSI CTHG 185HP Engine ECU Kit BCM + Key 03C906026AD Automatic

€284.95

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Part no. 8T0907468T

Audi A4 B8 A5 8T Gateway Control Unit Module ECU 8T0907468T

€23.95

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Part no. 4G0907697H

Audi TT FV LED Headlight Ballast Module Daytime Running Lights Unit 4G0907697H

€37.95

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Part no. 7557395-24

Mini Cooper R50 R52 1.6 W10 116HP Engine Control ECU Kit DME 7557395 Automatic

€170.95

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Part no. 4M0959795N

Audi A4 B9 Door Module Rear Left Right N/O/S Control Unit Module ECU 4M0959795N

€32.95

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Part no. 7600019-3

BMW Mini Cooper R55 R56 Petrol N12 1.6 120HP ECU Kit DME + CAS3 + Key 7600019

€118.95

Free delivery: Mar 10 – 11

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Part no. A6519003403-1

Mercedes W906 314 CDI OM651 Engine Module ECU Kit A6519003403 Automatic

€474.95

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Part no. F1ET-14F142-BC

Ford Transit Connect Door Module Front Left N/S Control Unit ECU F1ET-14F142-BC

€23.95

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Part no. A2465451440

Mercedes W176 Fuse Relay Box Cover Cap Top Trim Lid A2465451440

€23.95

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BMW F20 F30 F31 LCI Mini F55 F56 Compensator LTE UK Control Unit Module 9128982

€28.95

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Part no. A2218705687

Mercedes W221 Linguatronic Control Module Unit ECU English Version A2218705687

€85.95

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Part no. 7806042

Mini R55 R56 Connecting Wiring Cable Cooper D W16 Diesel 7806042

€23.95

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Part no. 5Q0971371

VW Volkswagen Golf Mk7 Positive Battery Terminal Cable Lead Wiring 5Q0971371

€56.95

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Part no. 4L0907468B

Audi Q7 4L Gateway Module Central Control Unit 4L0907468B

€23.95

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Part no. A2059006615

Mercedes W205 Windscreen Rain Sensor Front Control Unit A2059006615

€23.95

Free delivery: Mar 10 – 11

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Part no. 03C972619CG

VW Passat B7 Engine Wiring Loom Cable Harness Injector Module Petrol 03C972619CG

€104.95

Free delivery: Mar 10 – 11

If paid before 14:00

Part no. DV21-12A650-PB

Ford B-Max 1.0 EcoBoost 100HP Engine Control Unit ECU DV21-12A650-PB Manual

€142.95

Free delivery: Mar 10 – 11

If paid before 14:00

Part no. EB3T-14B321-EG

Ford Ranger Mk3 Restraint Air Module Control Unit ECU EB3T-14B321-EG

€75.95

Free delivery: Mar 10 – 11

If paid before 14:00

Part no. 7843335

BMW F10 M5 F12 M6 Engine Wiring Harness Valvetronic Servomotor Cyl.1-4 7843335

€47.95

Free delivery: Mar 10 – 11

If paid before 14:00

Part no. LR034238-2

Range Rover L405 Rear Tail Light Wiring Harness Cable Right O/S CK52-13404-BC

€23.95

Free delivery: Mar 10 – 11

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Part no. 9808786

Mini Paceman R61 Front Right O/S Window Lifter Mechanism Motor Regulator 9808786

€32.95

Free delivery: Mar 10 – 11

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Part no. 8601245

Earth Ground Cable BMW i3 I01 Hybrid Rex Electric Engine Wiring 8601245

€23.95

Free delivery: Mar 10 – 11

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Part no. A4145400130

Mercedes-Benz Vaneo W414 Cable Starter Line Positive Line Battery A4145400130

€23.95

Free delivery: Mar 10 – 11

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Part no. 4M0959595N

Audi Q7 4M Rear Door Control Module Unit ECU Left Right N/O/S 4M0959595N

€32.95

Free delivery: Mar 10 – 11

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Part no. 5Q0971250T

Volkswagen Golf Mk7 Seat Leon 5F Battery Wire Negative Earth Lead 5Q0971250T

€28.95

Free delivery: Mar 10 – 11

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Part no. F1ET-14F144-BC

Ford Transit Connect Door Module Front Right O/S Control Unit ECU F1ET-14F144-BC

€23.95

Free delivery: Mar 10 – 11

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Part no. 6839769

KaFAS Module BMW F10 F20 F30 Mini F55 F56 Assist Camera Control Unit 6839769

€32.95

Free delivery: Mar 10 – 11

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Part no. 4G1919129

Audi A1 8X A4 B8 A6 C7 A7 4G TV Tuner Module Control Unit 4G1919129

€85.95

Free delivery: Mar 10 – 11

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Part no. 8714621

Mini Cooper One F55 F56 F60 Telematics Control Unit Module 8734756

€237.95

Free delivery: Mar 10 – 11

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Part no. 8U0971687D

Audi Q3 8U Door Loom Wiring Harness Cable Rear Left Right N/O/S 8U0971687D

€28.95

Free delivery: Mar 10 – 11

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Part no. A1775408457

Mercedes W118 W177 Alternator Earth Cable Wiring Harness Loom A1775408457

€80.95

Free delivery: Mar 10 – 11

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Part no. F1F1-12A650-SA

Ford Focus Mk3 1.5 TDCI XWDE 120HP Engine Control Unit ECU F1F1-12A650-SA Manual

€113.95

Free delivery: Mar 10 – 11

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Part no. 2GA971395

VW Volkswagen T-ROC A11 Front Door Ambiente Light Wiring Left N/S 2GA971395

€23.95

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Part no. 1K0971228AB

Audi A3 8P VW Golf Mk6 Positive Battery Terminal Cable Wire Lead 1K0971228AB

€23.95

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Part no. 8678964

BMW X1 F48 Mini Cooper F55 F56 Engine Gearbox Module Wiring Cable Loom 8678964

€23.95

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Part no. A2128208726

Mercedes W212 Door Module Rear Left N/S Control Unit ECU A2128208726

€23.95

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Part no. 8K0907637A

Audi A5 8T Acceleration Yaw Rate Sensor Module Control Unit ECU 8K0907637A

€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. 9313656-1

BMW 3 Series F30 F80 Boot Trunk Lid Tailgate Wiring Loom Harness Cable 9260012

€28.95

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Part no. A2055408104

Battery Cable Mercedes W205 X253 Diesel OM651 Alternator Wiring A2055408104

€28.95

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Part no. 8573260-5

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

€308.95

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Part no. A9075407312

Mercedes W907 Battery Fuse Box Positive Distribution Terminal A2479061803

€56.95

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Part no. 8506434-4

BMW E81 E84 E87 E90 LCI 18d 118d 318d N47 ECU Kit DDE 8506434 CAS3 Key Automatic

€251.95

Free delivery: Mar 10 – 11

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Part no. 9350336

BMW F06 F12 F13 F80 Mini F56 Radio CD Player Head Unit 9395949

€75.95

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Part no. 4E0919887M

Sat Nav Audi S8 D3 A6 C6 DVD Drive Navigation Control Unit 4E0919887M

€37.95

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Part no. 6992955

BMW F25 Footwell Light Control Module ECU Unit FRM3 TEMIC 6992955

€113.95

Free delivery: Mar 10 – 11

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Part no. 9362398

BMW F20 F21 F30 F31 F32 F45 Body Control Unit Module REM 9362398

€37.95

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Part no. 8P0971148

Audi A3 8P Tailgate Heated Rear Window Wiring Harness Loom 8P0971148

€23.95

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Part no. 5P0035225A

Seat Leon 1P Altea Antenna Amplifier Booster 5P0035225A

€23.95

Free delivery: Mar 10 – 11

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Part no. 6C0919603A

VW Volkswagen Polo Mk5 6R Radio Multimedia Display Navigation Unit 6C0919603A

€142.95

Free delivery: Mar 10 – 11

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Part no. 9878660

BMW F40 F44 Battery Terminal Negative Minus Cable Wiring IBS 9878660

€23.95

Free delivery: Mar 10 – 11

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Part no. 8E0035456D

Audi A4 B8 Telephone Aerial Antenna Signal Amplifier Module 8E0035456D

€23.95

Free delivery: Mar 10 – 11

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Part no. 9291977

Mini Roadster R59 Cabrio Convertible Top Module CVM 61359291977 9291977

€47.95

Free delivery: Mar 10 – 11

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Part no. 8367094

BMW E65 Fuse Box Relay Unit Control Module Connector Box 8367094

€28.95

Free delivery: Mar 10 – 11

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Part no. 079903805AF

Audi A5 S5 S5 8T 4.2 FSI Alternator Bracket Mount Holder 079903805AF

€23.95

Free delivery: Mar 10 – 11

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Part no. 4H0907063BA

Audi A6 C7 Onboard Supply BCM Body Control Module Unit ECU 4H0907063BA

€32.95

Free delivery: Mar 10 – 11

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Part no. A2129000004-2

SAM Module Mercedes W212 Fuse Box Relay Control Unit A2129000004

€37.95

Free delivery: Mar 10 – 11

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Part no. 9200943

BMW 1 3 Series E81 E87 E90 E91 E92 Ultra Sonic Alarm System Module 9200943

€23.95

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Part no. 8510221-16

BMW E90 E91 E92 LCI 325d Diesel N57 204HP ECU Engine Module DDE 8510221 Manual

€104.95

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Part no. 8506373-1

BMW X3 E83 LCI 1.8d N47 Engine Control Unit ECU Kit Module DDE 8506373 EWS Key

€284.95

Free delivery: Mar 10 – 11

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Part no. A1695453740

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

€23.95

Free delivery: Mar 10 – 11

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Part no. 9264568-1

BMW E82 LCI Body Control Module Unit PL2RR JBBFE IIIR L1 9264568

€23.95

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Part no. BK2T-19L540-AE

Ford Transit Custom Mk8 Door Wiring Loom Harness Left N/S BK2T-19L540-AE

€23.95

Free delivery: Mar 10 – 11

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Part no. 4E0941285G

Audi S8 D3 Front Headlight Level Control Sensor Left N/S 4E0941285G

€32.95

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Part no. GR3T-18T806-BG

Ford Mustang GT Mk6 Audio Speaker Amplifier GR3T-18T806-BG FR3T-18B849-A

€85.95

Free delivery: Mar 10 – 11

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Part no. 9166783-1

BMW X5 X6 E70 E71 Rear Seat Console Entertainment DVD Display Screen 9166783

€284.95

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Part no. 8617551-5

BMW F20 F21 125i N20 218HP ECU Control Unit Kit DDE 8617551 Key FEM Automatic

€474.95

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Part no. 8470176-6

BMW F30 F31 LCI 320dX B47 190HP Diesel Engine Control ECU DDE 8470176 Automatic

€94.95

Free delivery: Mar 10 – 11

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Part no. 7620987-1

Mini One R55 R56 LCI N16 1.6 98HP Engine ECU Kit DME 7620987 CAS 3 + Key Manual

€246.95

Free delivery: Mar 10 – 11

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Part no. A2059068501

Mercedes W205 Fuse Box Rear Relay Electrical Control Unit Box A2059068501

€23.95

Free delivery: Mar 10 – 11

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Part no. 7253188-2

BMW E92 Seat Covering Panel Sports Left Right Thigh Support Cover Black Leather

€23.95

Free delivery: Mar 10 – 11

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Part no. 8577238

BMW F30 F31 Sterter Motor Alternator Cable Wiring Loom Harness 8577238

€28.95

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Part no. A2055457540

Mercedes W205 C238 X253 W213 Inner Firewall Contact Support A2055457540

€32.95

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Part no. 9286171

BMW F20 Front Right O/S Wiring Loom Harness Door O/S 9251711

€23.95

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Part no. A9079051602

Mercedes W907 Aerial Antenna Amplifier Control Unit Module A9079051602

€32.95

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Part no. JX61-12B533-AB

Ford Transit Mk8 Engine Glow Plug Relay Module 2.0 EcoBlue Diesel JX61-12B533-AB

€23.95

Free delivery: Mar 10 – 11

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Part no. RHD-A1664404337

Mercedes C292 Positive Cable Battery Starter Alternator Plus Wiring A1664404337

€85.95

Free delivery: Mar 10 – 11

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Part no. A2075844181

Mercedes C207 Fuse Box Grouping Fuse Placement Map Card Diagram A2075844181

€23.95

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Part no. 5N0971349AT

Volkswagen Tiguan 5N Alternator Generator Wiring Harness Cable 5N0971349AT

€28.95

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Part no. 8K0971104AF

Audi A5 8T 5 Door Rear Bumper PDC Parking Sensor Wiring Harness Loom 8K0971104AF

€23.95

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Part no. 9369633

Mini F54 F55 F56 F60 ECU Body Domain Controller BDC Module Control Unit 9369633

€142.95

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Part no. 9X2Q9A361CA

Range Rover L320 Sport Rear Fuel Pump Control Unit Bracket Holder 9X2Q9A361CA

€23.95

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Part no. 8K5035570

Audi A4 B8 Aerial Antenna Disturbance Suppressor 8K5035570

€23.95

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Part no. 5F0919866K

Seat Leon Mk3 Navigation SD Card Sat Nav Map Pilot Europe 5F0919866K

€28.95

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Part no. 8574095-2

BMW F20 F21 F30 116d 316d Diesel N47N Engine ECU DDE 8574095 Key Lock FEM Manual

€227.95

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Part no. 05L907309G

Volkswagen Crafter Mk2 2.0 TDI DNAE 140HP Engine ECU Kit 05L907309 Automatic

€284.95

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Part no. A1775409357

Mercedes W177 M282 Starter Alternator Electrical Wiring Harness A1775409357

€28.95

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Part no. 8517874-11

BMW F20 F21 F30 F31 116HP N47N Engine Control Unit ECU DDE 8517874 Automatic

€80.95

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Part no. 9288769

BMW F20 F22 F30 Sound Speaker Front Door Audio Mid Range Stereo HiFi 9288769

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Part no. 9119444

BMW E81 E87 LCI E90 E91 E92 Front Fuse Box Power Distribution 9119444

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Part no. 8384505

BMW E46 E60 E61 E63 E64 Windscreen Wipers Relay Brown 8384505

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Part no. A0009822023

Mercedes W204 W212 W221 Battery Relay Module Unit A0009822023

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Part no. 6934846

BMW E91 Antenna Amplifier Diversity Module 9193841 6934846

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Part no. 7603567

BMW E60 E93 Mini Cooper R55 R56 R60 Minus Lead IBS Negative Battery 7603567

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Part no. 6923954

BMW E39 E46 X5 E53 X3 E83 Z4 E85 E86 Mini R50 R53 Rain Light Sensor 6923954

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Air Module Wiring BMW X5 E70 E81 E87 E90 E91 E92 E93 Steering Wheel Loom

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BMW E60 E61 E65 E87 E90 Trailer Towing Control Unit Module AHM 4R 6850497

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Showing 6238-6336 of 14021 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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