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. 9111165-PB2

PDC Sensor BMW E81 E82 E87 E88 E90 E91 Ultrasonic Parking SET X4 Platinbronze

PLN 189.95

Free delivery: Mar 16

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VW Volkswagen T-ROC A11 Front Door Ambiente Light Wiring Right O/S 2GA971395A

PLN 42.95

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

PLN 47.95

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Part no. 7H0937550A

Volkswagen Trasnporter T5 Main Fuse Socket Engine Bay Panel Module 7H0937550A

PLN 42.95

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Part no. A6229001000

Mercedes W447 114CDI OM622.851 136HP Engine Control Unit Manual A6229001000

PLN 1,424.95

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Part no. GR3T-14B321-DF

Ford Mustang GT Mk6 Air Module Control Unit GR3T-14B321-DF

PLN 474.95

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Part no. 9371789

BMW F20 F21 F30 F31 Bluetooth Teleservices GPS Telematics Module 9371789

PLN 42.95

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BMW F20 F21 F22 F30 F32 LCI Integrated Supply Module Unit 8638551

PLN 113.95

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Porsche Cayenne 92A Trailer Tow Bar Towing Control Unit Module 7P0907383F

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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

PLN 95.95

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Part no. 8573260-5

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

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Part no. A6461508391-1

Mercedes W639 111CDI OM646 109HP Engine Control ECU Kit A6461508391 Automatic

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Part no. 5A37095

BMW i4 G26 Gran Coupe Electric Rear Door Wiring Harness Right Left N/O/S 5A37095

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BMW X5 F15 Fuel Tank Cable SCR AdBlue Unit Adapter Wiring Harness Diesel 9300859

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Audi A5 S5 8T Door Wiring Loom Harness Cable Rear Right O/S 8T8971688S

PLN 94.95

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Part no. A1669005811

Door Module Mercedes W176 W246 Front Right O/S Control Unit Module A1669005811

PLN 61.95

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Part no. 5WA962133E

Volkswagen Golf 5G Keyless Entry Module Aerial Antenna 5WA962133E

PLN 75.95

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BMW F25 CD DVD Navigation Sat Nav Head Unit 9294206

PLN 332.95

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Part no. 06E911024A

Audi A6 C7 A7 4G Engine Starter Motor 3.0 TFSI Petrol CGWD 06E911024A

PLN 113.95

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Part no. 8518569

BMW F20 F21 F30 F31 N47N 116d 316d ECU Control Unit Module DDE 8518569 Manual

PLN 237.95

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Part no. 7P0941828B

Volkswagen Touareg 7P 3.0 TDI Fuse Box Control Module 7P0941828B

PLN 161.95

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Part no. 8T2T-14B192-AB

Ford Mustang GT Mk6 Main Power Relay 4 Pins 8T2T-14B192-AB

PLN 42.95

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Part no. 6940588

BMW 5 Series E60 E61 Alarm System Unit Ultra Sonic Module 6940588

PLN 47.95

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Part no. 2Q0959655AN

Volkswagen Transporter T6 Air Module Sensor Control Unit ECU 2Q0959655AN

PLN 1,614.95

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Part no. 9259425-1

Positive Battery Cable BMW F30 F31 F80 M3 F82 M4 Plus Pole Power Red 9259425

PLN 104.95

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Part no. 9242204

Wiring BMW F12 F13 F06 Cable Set For Electric Parking Brake Handbrake 9242204

PLN 189.95

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Part no. 04L906021BH-1

Audi A4 B8 2.0 TDI CNHA 190HP Quattro Engine Control ECU Kit 04L906021BH Manual

PLN 1,139.95

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Part no. 8586568

BMW F20 F22 F23 Gearbox Transmission Module Harness Wiring Loom Cable 8586568

PLN 237.95

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Part no. A0024463140-4

Mercedes W169 A160 CDI 95HP M266.920 Engine ECU Kit A0024463140 Automatic

PLN 949.95

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Part no. 9224686

BMW Mini Clubman R55 Cable Wiring Loom Splitdoor Door Rear Right O/S 9224424

PLN 75.95

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Navigation Headunit BMW F20 F22 F30 Mini F55 F56 Head Unit Basic Media

PLN 569.95

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Part no. GK2T14B144GA

Ford Transit Mk8 VI Fuse Box Module Positive Battery Terminal GK2T-14B144-GA

PLN 142.95

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Part no. 8482940

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

PLN 113.95

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

PLN 61.95

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Part no. 5P0035225A

Seat Leon 1P Altea Antenna Amplifier Booster 5P0035225A

PLN 42.95

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Part no. 9389657

BMW F20 F21 F30 F31 Bluetooth Teleservices GPS Telematics Module 9389657

PLN 94.95

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Part no. A1779005409

Door Module Mercedes C118 W177 H243 Front Right O/S Door Control A1779005409

PLN 284.95

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BMW E65 E66 Sensor Front Right Door Airbag O/S 6970908

PLN 75.95

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Audi R8 42 GSM Antennna Receiver Amplifier Radio 420035503

PLN 902.95

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Part no. A2319009006

Door Module Mercedes R231 Front Door Left N/S Control Module A2319009006

PLN 142.95

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Land Rover Discovery Sport L550 Tailgate Opening Sensor Lower FK72-14E110-AA

PLN 94.95

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Part no. W639 Taxi Modules

Mercedes Vito W639 Control Unit Set Taxi Rear Wheel Steering Intercom Module

PLN 1,139.95

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Mercedes W204 W207 W212 W221 Starter Motor A6429060900

PLN 161.95

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Part no. A1775455100

Mercedes W177 AMG Antenna Amplifier Control Unit Module A1775455100

PLN 142.95

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Part no. 6933270

BMW 7 Series E65 E66 E67 Control Unit Door Rear Driver Side 6933270

PLN 47.95

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Part no. 6R0959655M

VW Volkswagen Polo 6R Seat Ibiza 6J Air Module Control Unit ECU 6R0959655M

PLN 161.95

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Part no. A2198200226

Door Module Mercedes C219 Rear Door Left N/S Control Module A2198200226

PLN 47.95

Delivery: Mar 16

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Part no. 896610D212

Toyota Yaris Mk1 XP10 1.0 1SZ-FE 68hp Engine Control Unit ECU 896610D212 Manual

PLN 94.95

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Part no. 7631932

Engine Wiring BMW F30 F31 N20 Loom Module Harness Cable 7631932

PLN 617.95

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Part no. 9387626-1

MINI Cooper One F55 F56 Rain / Light / Solar HUD Sensor Windshield 9387626

PLN 61.95

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Part no. 6992415

BMW 7 F02 ECU Body Control Module Junction Box JBBFEIIIR LP 6992415

PLN 189.95

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Part no. 4K0919390F

Audi A6 C8 Door Panel LED Module Light Unit Rear Right O/S 4K0919390F

PLN 42.95

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Part no. 4F0907280E

Audi Q7 4L On Board Power Supply Control Module Unit ECU 4F0907280E

PLN 61.95

Free delivery: Mar 16

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Part no. 8V3971035A

Audi A3 S3 8V 3D Door Wiring Harness Loom Cable Driver's Side 8V3971035A

PLN 94.95

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Part no. A2129004307

Display Screen Mercedes W204 W212 Information Navigation Dashboard A2129004307

PLN 379.95

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Part no. MB3T-14N143-MC

VW Amarok Mk2 Negative Earth Battery Wiring Loom Cable Connector MB3T-14N143-MC

PLN 142.95

Free delivery: Mar 16

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Part no. 7410838-1

BMW X3 F25 Front Headlight Lamp Light Wiring Harness Cable Right O/S 7410838

PLN 42.95

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Part no. 8V1035035B

Audi A3 S3 Q2 RS3 Multimedia Navigation Card Reader Head Unit 8V1035035B

PLN 2,374.95

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Part no. 06H911021A

Audi A5 8T 2.0 TFSI Petrol Engine Starter Motor Actuator 06H911021A

PLN 75.95

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Part no. A2049060305-1

Mercedes W204 SAM Module Control Unit Rear A2049060305

PLN 284.95

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Part no. 9128602

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

PLN 123.95

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Part no. 8W0907064EC

Audi A5 F5 BCM Body Comfort Module Onboard Control Unit ECU 8W0907064EC

PLN 284.95

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Part no. 8618444

BMW F30 LCI 330e B48X Cell Module Connector 8618444 61278618444

PLN 94.95

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Part no. 191906383C-1

Audi VW Volkswagen Seat Skoda Relay Unit Module 4 Pins 191906383C

PLN 42.95

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Part no. A2139005427

Mercedes W213 C238 Air Suspension Level Control Unit Module Airmatic A2139005427

PLN 807.95

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Part no. A6388200310

VW Volkswagen Crafter I Headliner Roof Alarm Movement Sensor A6388200310

PLN 42.95

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Part no. 8570934

BMW F20 F21 116d ed Diesel N47N 116HP ECU Engine Control Unit DDE 8570934 Manual

PLN 664.95

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Part no. 7L0907401B-1

Volkswagen Touareg 3.0 TDI BKS 225HP Engine Control ECU Kit 7L0907401B Automatic

PLN 1,899.95

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Part no. A2128300008

Fan Blower Mercedes W212 Comand Navi CD Control Unit Module Cooler A2128300008

PLN 47.95

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Part no. LR021530

Land Rover Discovery 4 L319 Front Seat Module Control Unit AH22-14D600-AD

PLN 237.95

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Part no. 8647878

BMW X5 F15 N20 Petrol Sensor System Engine Wiring Harness Cable Loom 8647878

PLN 712.95

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Part no. 3M5T-14N003-SB

Land Rover Discovery 4 L319 Wiring Harness Loom Passenger Seat 3M5T-14N003-SB

PLN 94.95

Free delivery: Mar 16

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Part no. 4F0959793T

Audi Q7 4L Door Module Front Driver's Side Control Unit ECU 4F0959793T

PLN 42.95

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Part no. 7328154-2

BMW F46 Rear Lamp Tillight Light Plug Socket Wiring Cable Right O/S 7328154

PLN 42.95

Delivery: Mar 16

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Part no. XS7U-11000-C4A

Ford Focus Mondeo Escort 1.8 Petrol Engine Motor Starter XS7U11000C4A

PLN 61.95

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Part no. 9292945

BMW F20 F21 F22 F30 F31 F32 F36 FEM Module Control Unit 9292945

PLN 522.95

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Part no. A0009822523

Mercedes W156 W242 W246 W447 Relay 4-Pin Black Hella A0009822523

PLN 42.95

Delivery: Mar 16

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Part no. DH52-10C652-AC

Land Rover FREELANDER 2 L359 Battery Cable Wire DH52-10C652-AC

PLN 42.95

Delivery: Mar 16

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Part no. 7075944-2

BMW E60 E65 E70 Front Right Seat O/S Height Adjustment Drive 7075944

PLN 94.95

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Part no. 99761817112

Porsche Cayman 987C Immobilizer Alarm Control Module Unit 99761817112

PLN 218.95

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Part no. 241268711R

Door Wiring Renault Master 3 Rear Sliding Cable Harness 241268711R

PLN 47.95

Delivery: Mar 16

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Part no. 9387561

Head Unit BMW I3 I8 Mini F56 Navigation Sat Nav DAB High Control Module 9387561

PLN 1,519.95

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Part no. 8K0907063N

Audi A4 B8 Body Control Comfort Unit Module BCM Unit ECU 8K0907063N

PLN 218.95

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Part no. 8H2210F845AA

Land Rover Discovery 3 L319 Bluetooth Phone Control Module 8H2210F845AA

PLN 284.95

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Part no. 420919275-1

Rear Bumper PDC Audi A5 Sensor Parking Distance Control 420919275 1706091849

PLN 75.95

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Part no. A2129004718

Door Module Mercedes W212 Front Right Control Unit Module A2129004718

PLN 70.95

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Part no. 8D0972695

Audi R8 42 Diagnostic Plug Connector Wiring Loom Cable Harness 8D0972695

PLN 42.95

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Part no. 6R0971349AP

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

PLN 94.95

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Part no. 8W0906093D

Audi A4 B9 Fuel Pump Control Unit Module ECU 8W0906093D

PLN 142.95

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Part no. 6920469

BMW E65 E66 E67 Sensor A-pillar Right Airbag 65776920469 6920469

PLN 47.95

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Part no. LR014003-2

Land Rover Discovery 4 L319 Rear Taillight Lamp Wiring Cable Left N/S LR014003

PLN 42.95

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Part no. 8W0907159F

Audi A4 S4 B9 A5 S5 Impact Sound Actuator Control Module 8W0907159F

PLN 142.95

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Part no. 0AM911022C

Volkswagen Golf Mk8 Engine Starter Motor Assembly Unit 0AM911022C

PLN 94.95

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Part no. 6907519-1

BMW 7 SERIES E65 E66 E67 Battery cable plus pole 6907519

PLN 42.95

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Part no. 4H0907247

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

PLN 42.95

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Part no. 4D0907131

Audi VW Volkswagen Seat Relay Unit Module 4 Pins 12V 4D09907131

PLN 61.95

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Part no. KV6T10C679BC

Ford Transit Connect Battery Cable Negative Lead Terminal Harness KV6T10C679BC

PLN 94.95

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Part no. PC3T-19J220-BC-1

VW Volkswagen Amarok Mk2 Front Door Camera Control Unit Left N/S PC3T-19J220-BC

PLN 332.95

Free delivery: Mar 16

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Part no. A1779008511

Door Module Mercedes W177 W247 Rear Left Right N/O/S Control Unit A1779008511

PLN 170.95

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Showing 2773-2871 of 13895 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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