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. 9289587

BMW 2 X1 Series F45 F48 Radio Antenna Amplifier Suppression Filter 9289587

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. A1645400624

Mercedes W164 Fuse Box Relay Housing Cover A1645400624

PLN 75.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 9150889

BMW E81 E87 LCI Front PDC Parking Distance Control Loom Wiring 9150889

PLN 189.95

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Part no. 8601245

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

PLN 75.95

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Part no. 5Q0919283B

PDC Module Audi A3 8V Seat Leon Skoda Octavia Parking Control Unit 5Q0919283B

PLN 42.95

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Part no. A2139007839

Mercedes W167 W177 W247 Headlight Ballast Control Module Left N/S A2139007839

PLN 379.95

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Part no. 1K0971250AL

Audi A3 8P Negative Battery Terminal Cable Wiring Battery Wire 1K0971250AL

PLN 42.95

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Part no. 4E0035061D

Audi A8 D3 Radio Audio Sound Amplifier Tuner Harman Becker 4E0035061D

PLN 759.95

Free delivery - Tue, Jan 13

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Part no. 6822077

BMW F20 F21 F22 F30 F31 Head Unit Basic Media Navigation Headunit 6822077

PLN 218.95

Free delivery - Tue, Jan 13

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Part no. rhd-A1185407902

Mercedes C118 Front Door Left Right N/O/S Electrical Wiring Harness A1185407902

PLN 113.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 03C903024F

Alternator Audi A3 8P VW Passat B7 Engine Generator 1.4 TSI 03C903024F

PLN 237.95

Free delivery - Tue, Jan 13

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Part no. 8573260-4

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

PLN 1,709.95

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Part no. 9335350

BMW F30 F31 F34 GT Radio Professional DAB CD Player 9335350

PLN 949.95

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Part no. A2218201875

Mercedes W221 Aerial Antenna Control Unit Keyless Go Entry Module A2218201875

PLN 42.95

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Part no. 9297282-1

BMW E63 E64 Battery Power Cable Lead Positive Underfloor Red 9297282

PLN 142.95

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Part no. 7589971-1

Mini One R55 R56 N12 1.4 95HP ECU Engine Control Unit DME 7589971

PLN 379.95

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Part no. A2135400329

Mercedes X253 Electrical Wiring Harness Cable Hybrid A2135400329

PLN 379.95

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Part no. A6388200310

VW Volkswagen Crafter I Headliner Roof Alarm Movement Sensor A6388200310

PLN 42.95

Delivery - Tue, Jan 13

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Part no. 8794297

BMW F20 F21 F22 F30 F31 F32 Mini F55 F56 F57 Head Unit Basic Media DAB 8794297

PLN 569.95

Free delivery - Tue, Jan 13

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Part no. A2049009907-2

Mercedes W204 Navigation Radio Player Head Unit Computer A2049009907

PLN 664.95

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Part no. 9222861

BMW 1 3 Series E87 E90 LCI CIC Sat NAV Screen Navigation Professional 9222861

PLN 2,374.95

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Part no. 9361145

Mini Cooper One R55 R56 R57 LCI R58 R59 CHAMP 2 Navigation 9361145

PLN 664.95

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If paid before 14:00

Part no. A1729060105

Mercedes SLK R172 Rear Fuse Box SAM Relay Control Unit Module A1729060105

PLN 332.95

Free delivery - Tue, Jan 13

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Part no. 6838609

Antenna Amplifier BMW F40 Aeral Diversity Control Unit FM DAB Live Dash 6838609

PLN 104.95

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Part no. 7M0951253A

Audi VW Volkswagen Seat Relay Unit Module 4 Pins 7M0951253A

PLN 42.95

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Part no. 9167397

Mini Cooper R57 R58 R59 Hands Free Telephone Microphone 9167397

PLN 75.95

Free delivery - Tue, Jan 13

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Part no. 7634061

BMW F10 Engine Transmission Module Cable Loom Wiring Harness 7634061

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. 9663381380

Peugeot 207 Engine Wiring Harness Cable Loom 1.6 HDi DV6 9663381380

PLN 360.95

Free delivery - Tue, Jan 13

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Part no. 4F0907280A

Audi A6 C6 On Board Onboard Supply Module Control Unit ECU 4F0907280A

PLN 66.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A2055463100

Retaining Plate Mercedes W205 Relay Fuse Box Holder Bracket A2055463100

PLN 85.95

Free delivery - Tue, Jan 13

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Part no. 06E911021F

Audi A5 8T A6 C7 Engine Starter Motor 3.0 TFSI Petrol 06E911021F

PLN 123.95

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Part no. A0005468502

Battery Cover Mercedes W205 W212 Battery Positive Pole Cover Red A0005468502

PLN 47.95

Delivery - Tue, Jan 13

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Part no. A1695458140

Mercedes W169 W245 Relay Control Unit Bracket Mount Holder Cover A1695458140

PLN 66.95

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Part no. 03L906018JR

Audi A4 B8 2.0 TDI CJCB 136HP Engine Control Unit Module ECU 03L906018JR Manual

PLN 949.95

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Part no. 6977066

BMW X5 E70 Door Cable Harness Wiring 6977066 6937277

PLN 61.95

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Part no. 6968649

BMW E93 Convertible Aerial Antenna Amplifier FM/AM Left N/S 6968649

PLN 37.95

Delivery - Tue, Jan 13

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Part no. 4H0959107AC

Audi A8 4D Tailgate Lift Boot Lid Control Unit Module Trunk 4H0959107AC

PLN 180.95

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Part no. 8605456

Engine Wiring BMW F21 F30 LCI F36 N20 Loom Module Harness Cable 8605456

PLN 180.95

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Part no. 6933162

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

PLN 189.95

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Part no. 6911908

On Board Monitor BMW X5 E70 X6 E71 Sat Nav System Screen Display 8,8" 6911908

PLN 284.95

Free delivery - Tue, Jan 13

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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

Free delivery - Tue, Jan 13

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Part no. A1718300272

Mercedes A B ML Class W166 W169 W245 Interior Temperature Sensor A1718300272

PLN 42.95

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Part no. 8516739-6

Mini SD R56 LCI R60 143HP N47N Engine ECU Kit DDE 8516739 + CAS3 + Key, Manual

PLN 949.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 5WA919298

Audi S3 8Y PDC Parking Distance Assist Sensor Module Control Unit 5WA919298

PLN 189.95

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Part no. 8634124

BMW F40 F45 X1 F48 Mini F55 F56 F60 Alternator Generator Denso 120A 8634124

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. 7798875

BMW X5 Series E70 LCI Ventilation Grommet Unit Box Cover 7798875

PLN 75.95

Free delivery - Tue, Jan 13

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Part no. 9299592

BMW F10 F11 Central Gateway Module ECU Control Unit Lear ZGW-02 4SK 9299592

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. 8K590735700

Audi A5 8T Front Lamp Xenon Headlight Range Control Module 8K590735700

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 3420482

BMW X3 E83 Ground Earth Cable Battery Wiring 3420482

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 9348358

BMW E60 Body Comfort Control Unit DDE Module ECU 9348358

PLN 427.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 6949228-1

2 x Mini Cooper R52 Convertible DWA Door Alarm System Module Unit Set 6949228

PLN 47.95

Delivery - Tue, Jan 13

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Part no. 5N0035341G

Volkswagen Golf Scirocco CC Multimedia Interface Module Box 5N0035341G

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. 9242204

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

PLN 189.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4G0035056-1

Audi A4 B8 Sat Nav Multimedia DAB Radio Control Head Unit 4G0035056

PLN 949.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8580165

Mini F54 F55 F56 F57 F60 B47 Wiring Harness Engine Glow Plug Module 8580165

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. 9371790

BMW 1 Series F20 Telematics Control Unit Module Bluetooth 9371790

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. 8580307

BMW X1 E84 18dX Diesel N47N Engine Control Unit Module ECU DDE 8580307 Manual

PLN 427.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 9200943

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

PLN 28.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 7561834-13

BMW E87 E90 120i 320i N46 150HP Engine Control DME Module 7561834 Automatic

PLN 664.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 7304589

BMW F01 F02 Headlight Module LEAR TMS Headlamp Control Unit Module 7304589

PLN 284.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A2709000900-4

Mercedes W176 A45 4Matic M133.980 381HP Engine Control ECU A2709000900 Automatic

PLN 2,374.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. H1BT18K811LF

Ford Transit Custom Mk1 Radio Head Unit Control Panel H1BT18K811LF

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A2115460580

Wiring Holder Mercedes W211 Cable Loom Harness Cover Channel A2115460580

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. 7464634

BMW X1 F48 Control Unit Remote Backrest Unlocking 7464634

PLN 42.95

Delivery - Tue, Jan 13

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Part no. 8S0959121

Audi TT FV 8S Crash Impact Sensor Pedestrian Protection Module Front 8S0959121

PLN 237.95

Free delivery - Tue, Jan 13

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Part no. 8W9971104A

Audi S4 B9 Wiring Loom Set PDC Rear Complete Harness Parking Sensor 8W9971104A

PLN 237.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A6519007500-11

Mercedes W204 C 200 CDI 651.913 136HP Engine Unit ECU Kit A6519007500 Key Lock

PLN 664.95

Free delivery - Tue, Jan 13

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Part no. 6R0802717B

Seat Ibiza 6J Audi A1 8X Battery Tray Holder Mounting Bracket Cover 6R0802717B

PLN 42.95

Delivery - Tue, Jan 13

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Part no. 94520-4H0004X

Hyundai H-1 Dashboard Panel Digital Clock Watch Unit 94520-4H0004X

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. 3417586

Electronic Box BMW X3 E83 LCI 2.5si 3.0si N52N Control Unit Mount Holder 3417586

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A0141540402

Alternator Mercedes W164 OM272 Engine Alternator 180A 14V Valeo A0141540402

PLN 369.95

Free delivery - Tue, Jan 13

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Part no. 6C1T14A481CA

Ford Transit Mk7 Under Bonnet Fuse Box Module Onboard Supply 6C1T14A481ACA

PLN 284.95

Free delivery - Tue, Jan 13

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Part no. A2749003900

Mercedes Vito W447 Electronic Control Unit Module ECU A2749003900

PLN 949.95

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Part no. A1635400734

Mercedes-Benz M ML W163 Rear Left Right Door Wiring Loom Harness A1635400734

PLN 47.95

Delivery - Tue, Jan 13

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Part no. 7857551

Battery Cable BMW F80 M3 F82 M4 Wire Lead Positive Alternator Starter B+ 7857551

PLN 237.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 9296780

BMW F20 F21 F30 F31 Control Unit Air Conditioning Module 9296780

PLN 55.95

Delivery - Tue, Jan 13

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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. A2118205885

Mercedes E-Class S-Class W211 W220 Nokia Phone Control Unit Module ECU

PLN 42.95

Delivery - Tue, Jan 13

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Part no. 231A07345R

Smart Fortwo C453 Central Door Locking Control Unit Module ECU 231A07345R

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. 8J0971349CD

Audi TT 8J Alternator Main Cable Wiring Harness Loom 8J0971349CD

PLN 113.95

Free delivery - Tue, Jan 13

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Part no. A1569057900

Mercedes W176 Aerial Antenna Amplifier A1569057900

PLN 37.95

Delivery - Tue, Jan 13

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Part no. 3C0915336A

Audi A3 8P Battery Box Tray Covering Housing Trim Holder Bracket 3C0915336A

PLN 42.95

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Part no. 7574365-1

Alternator Generator Mini Cooper R55 R56 R57 R57 R58 LCI Petrol 7574365

PLN 113.95

Free delivery - Tue, Jan 13

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Part no. 9248096

Air Module BMW F01 F02 LCI F06 F10 F11 F13 ECU Control Unit ECU 9248096

PLN 113.95

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Part no. 8267406

Headrest Adjustment BMW E46 E64 Front Right O/S Seat Actuator 8267406

PLN 42.95

Delivery - Tue, Jan 13

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Part no. 7799146

Mini R55 R56 Alternator Supporting Bracket Mount Generator Diesel W16 7799146

PLN 47.95

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Part no. A4475401440

Mercedes Vito W447 Fuse Box Relay Control Unit Module A4475401440

PLN 237.95

Free delivery - Tue, Jan 13

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Part no. A6519007401

Mercedes W212 E250CDI Blue Efficiency OM651 204HP Engine Module ECU A6519007401

PLN 379.95

Free delivery - Tue, Jan 13

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Part no. A1718600205

Mercedes R171 Passenger Seat Air Module Control Unit Module A1718600205

PLN 189.95

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Part no. 8U0955559C

Audi RS3 8V Front Windscreen Rain Light Solar Sensor Unit 8U0955559C

PLN 94.95

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Part no. A4539052600

Smart Fortwo C453 Aerial Antenna Rod Radio GPS Antenna Unit A4539052600

PLN 379.95

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Part no. 8T0907441D

AUDI A4 B8 Reversing Camera Control Module Rear View Unit ECU 8T0907441D

PLN 569.95

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Part no. A2118703285

Mercedes W211 Door Module Rear Right O/S Control Unit ECU A2118703285

PLN 47.95

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Part no. 6948692

BMW E60 E61 E63 Passenger Side Door Airbag Control Module 6948692

PLN 56.95

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Part no. 8476016

Battery Cable BMW X3 G01 X4 G02 Diesel Alternator Starter Positive Cable 8476016

PLN 142.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 9148264

Seat Module BMW E87 E90 E91 E92 Control Unit ECU 9148264

PLN 85.95

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Part no. 5F4971036D

Seat Leon Mk3 5F Door Wiring Loom Harness Front Passenger Side 5F4971036D

PLN 94.95

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Part no. 6865298

BMW F20 F21 F30 F31 ECU ICM Plus Control Unit Module Airbag 6865298

PLN 43.95

Delivery - Tue, Jan 13

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Part no. A1779005509

Door Module Mercedes C118 W177 H243 Rear Left N/S Door Control A1779005509

PLN 284.95

Free delivery - Tue, Jan 13

If paid before 14:00

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Showing 2971-3069 of 12189 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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