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. 02M911024S

VW Golf MK7 5G Audi A3 8V Engine Starter Motor Valeo 2.0 TDI Diesel 02M911024S

PLN 75.95

Free delivery - Tue, Nov 25

If paid before 14:00

Part no. 99661510200

Porsche Boxster 986 Rear Spoiler Control Relay 99661510200

PLN 42.95

Delivery - Tue, Nov 25

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Part no. 8617707

BMW Mini Cooper F55 F56 Wiring Harness Engine Supply Module Cable Loom 8617707

PLN 42.95

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Part no. 9180402

BMW E90 Front Sport Seat Lumbar Wiring Loom Harness Cable 9180402

PLN 94.95

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Part no. 8570442

Engine Wiring BMW F25 F26 2.0dX B47 Loom Module Harness Cable Automatic 8570442

PLN 94.95

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Part no. 6931507

BMW E60 E61 E63 E87 E90 E91 F10 Diagnosis Interface Most 6931507

PLN 42.95

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Part no. A9075406749

Mercedes W907 Battery Electrical Ground Line Wire Earth Cable A9075406749

PLN 94.95

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Part no. A2518204426

Mercedes V251 W164 Front Lamp Headlight Control Module Unit HELLA A2518204426

PLN 42.95

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Part no. 9274023

BMW F20 F21 F30 F31 REM Rear Electronic Module Fuse Box Control Unit V3 9274023

PLN 237.95

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Part no. A1669000318

Mercedes-Benz A B Class W176 W246 Front Left N/S Door Control Unit Module ECU

PLN 123.95

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Part no. A2518701889

Antenna Amplifier Mercedes W164 W251 Aerial Control Unit Module A2518701889

PLN 42.95

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Part no. A9069820109

Mercedes Sprinter W906 Positive Battery Terminal Cover Cap Trim Red A9069820109

PLN 42.95

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Part no. 7589354

Mini R55 R56 R57 R59 R60 JCW Engine Starter Motor Actuator 7589354

PLN 42.95

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Part no. 9319081

BMW F20 F21 F22 F30 F31 F32 Radio Remote Control Receiver 434 MHZ

PLN 42.95

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Part no. 06M911021A

Audi SQ5 FY Starter Motor Engine Diesel Bosch 06M911021A

PLN 94.95

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Part no. 4FO903291

Audi A6 C6 2.0 TDI Relay Condenser 4FO903291

PLN 42.95

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Part no. 9338153

Mini F54 F60 Clubman Countryman Antenna Aerial Amplifier AM / FM Unit 9338153

PLN 75.95

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Part no. 7534705

Mini R50 R52 Ground Battery Cable Alternator Starter 7534705

PLN 42.95

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Part no. A2105400230

Mercedes-Benz E-Class W210 Battery Positive Plus Cable Loom Harness A2105400230

PLN 56.95

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Part no. 4G0035083

Stereo DAB Radio Audi A4 B8 Q5 8R CD Player Radio Receiver Head Unit 4G0035083

PLN 569.95

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Part no. 8516253

Engine Wiring BMW F46 Mini F56 B47 Loom Harness Injection Valve Ignition 8516253

PLN 949.95

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Part no. 8K0959794A

Audi A4 B8 Door Module Rear Right O/S Control Unit Module ECU 8K0959794A

PLN 42.95

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Part no. A2115400008

ABS Sensor Mercedes W211 C219 Front Brake Wiring Harness Right O/S A2115400006

PLN 94.95

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Part no. 9266383

Display Screen BMW F12 F13 Central Information Monitor 10" Multimedia 9266383

PLN 607.95

Free delivery - Tue, Nov 25

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Part no. 6809051

BMW F20 LCI REM Rear Electronic Module Fuse Box Control 6809051

PLN 56.95

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Part no. A2079052800

Mercedes-Benz E-Class W207 Cabrio A207 Anti Theft Alarm Module Control Unit ECU

Product currently unavailable

Part no. 9165623

BMW X5 X6 Series E70 E71 Airbag Control ECU Unit Module 9165623

PLN 47.95

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Part no. A1669004519

Mercedes C292 SAM Module Rear Control Unit A1669004519

PLN 189.95

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Part no. 02E911024B

Starter Motor VW Golf GTI Audi Seat Skoda Petrol CJX CHHA Bosch 1.1KW 02E911024B

PLN 61.95

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Part no. 1K0951253-1

VW Volkswagen Audi Seat Relay 449 12V 30A Unit Module 4 Pins 1K0951253

PLN 42.95

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Part no. A2213201058

Mercedes R231 Valve Block Air Suspension Control Unit A2123200358

PLN 854.95

Free delivery - Tue, Nov 25

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Part no. 6957347

BMW 6 Series E63 E64 F06 F12 F13 Aerial Antenna Amplifier Module Left N/S

PLN 47.95

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Part no. 8583657

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

PLN 42.95

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Part no. 8510221-13

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

PLN 759.95

Free delivery - Tue, Nov 25

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Part no. A1725400433

Electric Wire Mercedes SLK R172 M271 Alternator Prefuse Box Wiring A1725400433

PLN 93.95

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Part no. A2049009614

Mercedes W204 CD Player Radio Navigation Sat Nav Head Unit A2049009614

PLN 1,234.95

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Part no. 4M0959595N

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

PLN 113.95

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Part no. 8W0915459E

Audi A4 B9 Battery Positive Terminal Cable Plus Pole Wiring Harness 8W0915459E

PLN 94.95

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Part no. 8518568-4

BMW F20 F30 F32 120d 320d 420d N47N 184HP Engine Unit ECU DDE 8518568 Automatic

PLN 379.95

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Part no. 6976156

BMW E60 E61 E63 Passenger Side Door Air Control Module 6976156

PLN 61.95

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Part no. N000000003996

Mercedes Universal Fuse Relay Electrical Unit Set Bag N000000 003996

PLN 42.95

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Part no. 7253188-1

BMW 3 Series E92 Sports Seat Left Right Thigh Support Cover Trim Leather Dakota

PLN 85.95

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Part no. 8355056

BMW 5 X5 Series E53 Fuel Tank Flap Actuator 8355056

PLN 47.95

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Part no. A0035423019

Power Relay Control Mercedes W176 W246 Module 4 Pin 12V 20A A0035423019

PLN 42.95

Delivery - Tue, Nov 25

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Part no. 09D927750EE

VW Volkswagen Touareg 7L Automatic Gearbox Module Control Unit ECU 09D927750EE

PLN 75.95

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Part no. 7539787

BMW Mini Cooper R55 R56 R57 R58 Negative Battery Cable 7539787

PLN 42.95

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Part no. 8506281-5

BMW E87 E90 LCI 116d 316d Diesel N47 ECU KIT Engine DDE 8506281 CAS3 Key Manual

PLN 379.95

Free delivery - Tue, Nov 25

If paid before 14:00

Part no. A6396890379

Mercedes Viano Vito W639 Radio Fan Adapter Control Unit Module A6396890379

PLN 94.95

Free delivery - Tue, Nov 25

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Part no. 7627023

BMW F20 F21 F30 Petrol N13 Automatic Gearbox Engine Sensor Module 1 Wiring

PLN 113.95

Free delivery - Tue, Nov 25

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Part no. 7807802-1

BMW X5 E70 LCI X6 E71 N57 N57S Cable Alternator Starter Base B Wiring 7807802

PLN 85.95

Free delivery - Tue, Nov 25

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Part no. 9321022

BMW Mini Cooper F55 F56 F57 B Junction Terminal Box 300-400 W 9321022

PLN 84.95

Free delivery - Tue, Nov 25

If paid before 14:00

Part no. 8P0035192SX

Audi A3 S3 8P Radio Media GPS Sat Audi Navigation Plus Unit 8P0035192QX

PLN 949.95

Free delivery - Tue, Nov 25

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Part no. 8T0915181

Audi A4 RS4 B8 Battery Terminal Negative Cable Loom Harness Wiring 8T0915181

PLN 42.95

Delivery - Tue, Nov 25

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Part no. 95B980654D

Porsche Macan 95B Front Windscreen Lane Assist Kafas Camera 95B980654D

PLN 902.95

Free delivery - Tue, Nov 25

If paid before 14:00

Part no. 9240943

Mini Cooper R55 R56 LCI R60 Electrical System Fuse Distribution Box 9240943

PLN 132.95

Free delivery - Tue, Nov 25

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Part no. 9264568

BMW E92 LCI Body Control Module Unit PL2RR JBBFE IIIR L1 9264568

PLN 42.95

Delivery - Tue, Nov 25

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Part no. 9257426

Fuse Box Grouping BMW F10 F11 Fuse Placement Map Card Diagram 9257426

PLN 42.95

Delivery - Tue, Nov 25

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Part no. 9327318

BMW 1 2 3 4 5 F10 F20 F22 F30 F32 Navigation Sat Nav DAB Head Unit High 9327318

PLN 1,472.95

Free delivery - Tue, Nov 25

If paid before 14:00

Part no. A1679003418

Mercedes W205 C253 W257 Door Module Rear Left N/S Control Unit ECU A1679003418

PLN 284.95

Free delivery - Tue, Nov 25

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Part no. 6928461

BMW E46 E60 E61 E63 E81 E87 E90 E91 X3 E83 X5 E53 E70 Bluetooth Antenna 6928461

PLN 42.95

Delivery - Tue, Nov 25

If paid before 14:00

Part no. 8365960

BMW E38 E39 E53 Battery Crash Disconnection Control Relay 8365960

PLN 42.95

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Part no. 9118064

BMW 7 Series E65 E66 Centre Console Vent Storage Compartment Support 9118064

PLN 47.95

Delivery - Tue, Nov 25

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Part no. 6928050

BMW 7 Series E65 E66 E67 Battery Cable Wire Earth Ground Minus Negative L=260MM

PLN 46.95

Delivery - Tue, Nov 25

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Part no. A1668200689

Antenna Amplifier Mercedes W176 Aerial Module Unit Rear A1668200689

PLN 42.95

Delivery - Tue, Nov 25

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Part no. 9316575

BMW 1 2 Series F20 F21 F22 Battery Cable Lead Positive Underfloor 9316575

PLN 85.95

Free delivery - Tue, Nov 25

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Part no. A2229067403

Mercedes W177 W247 M260 Exhaust Control Valve Flap Actuator Drive A2229067403

PLN 854.95

Free delivery - Tue, Nov 25

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Part no. 8W8959107D

Audi A5 F5 Rear Hatch Tailgate Boot Lid Control Module Unit ECU 8W8959107D

PLN 94.95

Free delivery - Tue, Nov 25

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Part no. A1775401910

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

PLN 113.95

Free delivery - Tue, Nov 25

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Part no. 6972651

BMW Mini R52 Cabrio Convertible Folding Top Roof Module 6972651

PLN 94.95

Free delivery - Tue, Nov 25

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Part no. AC1112A650BC

Ford Transit MK7 2.4 TDCI T24DD0P Diesel Engine Control Unit ECU AC1112A650BC

PLN 104.95

Free delivery - Tue, Nov 25

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Part no. A2469005010

Mercedes W176 W246 Parktronic Parking Control Unit Module ECU A2469005010

PLN 94.95

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Part no. 9324779

BMW F20 F21 F22 F30 F31 F32 F36 Module Control Unit FEM LR-01 9324779

PLN 474.95

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Part no. 06K907425B-15

Audi S3 8V 2.0 TFSI DJHA 310HP Quattro Engine Unit ECU Kit 06K907425B Automatic

PLN 1,519.95

Free delivery - Tue, Nov 25

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Part no. 7521582

BMW E46 E83 E85 Engine Electronics Unit Box Cover Trim 7521582

PLN 42.95

Delivery - Tue, Nov 25

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Part no. 9148265

BMW E70 E87 E90 E91 E92 Seat Control Unit Module ECU 9148265

PLN 75.95

Free delivery - Tue, Nov 25

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Part no. A2479002707

Communication Module Mercedes W177 W247 Hermes LTE Control Unit A2479002707

PLN 218.95

Free delivery - Tue, Nov 25

If paid before 14:00

Part no. 6826790

BMW F10 F20 F22 F30 Navigation Sat Nav Head Unit High 9387565

PLN 569.95

Free delivery - Tue, Nov 25

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Part no. A2139003022

Door Module Mercedes W205 W213 X253 Rear Right Door Control Unit A2139003022

PLN 94.95

Free delivery - Tue, Nov 25

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Part no. 1167294

Mini Cooper One R50 R52 Fresh Air Recirculating Actuator 1167294 6NN007626

PLN 47.95

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Part no. A2129007024

Mercedes CLS C218 Front Fuse Relay Box On Board Supply A2129007024

PLN 322.95

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Part no. 6960308

BMW 1 Series E88 Convertible Rear Bumper FM Radio Aerial Antenna 6960308

PLN 65.95

Free delivery - Tue, Nov 25

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Part no. 1439740

BMW X5 E53 Cable Starter-Base B Electrical Cable Wiring 3.0i M54 Petrol 1439740

PLN 42.95

Delivery - Tue, Nov 25

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Part no. 8R0907364B

Audi Q5 8R A5 8T A4 B8 Active Suspension Module Damping Control Unit 8R0907364B

PLN 142.95

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Part no. 9178791

BMW F01 F02 F10 F11 Cable Wiring Set ARS Valve Block 9178791

PLN 142.95

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Part no. A2045420323

PDC Display Mercedes W204 Front Parking Sensor Screen Control Unit A2045420323

PLN 61.95

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Part no. 5QA919283E

Audi A3 8V Park Parking Assist PDC Distance Control Unit Module 5QA919283E

PLN 123.95

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Part no. 3415414

BMW Mini Cooper One R56 Aerial Antenna Amplifier Diversity Module 3415414

PLN 42.95

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Part no. 7565300-18

BMW Z4 E85 2.0 N46 150HP Engine Module ECU Kit DME 7565300 + EWS + Key Manual

PLN 1,234.95

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Part no. 6949226

BMW E63 E64 Convertible Coupe DWA Alarm System Module Control Unit 6949226

PLN 42.95

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Part no. 4F0959794E

Audi A6 C6 Rear Door Right O/S Module Unit Control ECU 4F0959794E

PLN 42.95

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Part no. A0009002414

Module Fuel Pump Mercedes W205 C253 Control Module Unit A0009002414

PLN 75.95

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Part no. 5WA907530Q

Audi A3 RS3 8Y Gateway Control Unit Module ECU GW2020 High 5WA907530Q

PLN 113.95

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Part no. A2215408609

Mercedes W221 Rear Door Wiring Harness Cable Left N/S A2215408609

PLN 142.95

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Part no. A2129005912

Mercedes W204 Fuse Box Relay SAM Control Unit Module A2129005912

PLN 332.95

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Part no. 8510591

BMW E60 E87 E90 LCI 120d 320d 520d N47 Engine ECU DDE 8510591 Manual

PLN 474.95

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Part no. 6929701

BMW 7 Series E65 E66 Alarm System Ultra Sonic Module 65756929701 6929701

PLN 42.95

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Part no. 6855995

Control Unit Module BMW F20 F21 F22 F30 F31 ECU ICM Plus 6855995

PLN 75.95

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Part no. 4E0919887M

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

PLN 61.95

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Part no. 8376443

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

PLN 42.95

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Showing 1486-1584 of 11506 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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