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. A2045407135

Earth Ground Cable Mercedes W204 C207 Line Strap Battery Lead A2045407135

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 9387151-1

BMW F30 Hybrid 330e B48X Positive Battery Lead Cable Starter Unit Wiring 9387151

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8574372-3

BMW F30 330d F32 430d N57N 258HP Engine Unit ECU Kit DDE 8574372 Key FEM

PLN 949.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 896500D040

Toyota Yaris MK1 Power Steering Column Control Unit Module 896500D040

PLN 75.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A0009007126

Air Conditioning Module Mercedes W205 W213 C253 A/C Control Unit ECU A0009007126

PLN 170.95

Free delivery - Tue, Jan 13

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Part no. 8512047-4

BMW E90 E91 LCI N47N 320d 184HP Engine Control Unit ECU DDE 8512047 Automatic

PLN 237.95

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Part no. 8616810

BMW 1 2 3 4 Series F20 F21 F22 F23 F30 F31 F32 Battery Cable Connecying Line

PLN 42.95

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Part no. A2055406621

Starter Cable Mercedes W205 GLC X253 Electrical Wiring Harness A2055406621

PLN 108.95

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If paid before 14:00

Part no. A0005459812

Mercedes Vito W447 W213 OM654 Power Distribution Relay Unit Module A0005459812

PLN 113.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 6864206

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

PLN 61.95

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If paid before 14:00

Part no. A1729060205

Mercedes SLK R172 Rear SAM Fuse Relay Box Control Unit Module A1729060205

PLN 379.95

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Part no. 8573260-8

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

PLN 1,709.95

Free delivery - Tue, Jan 13

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Part no. A2469004313

Gearbox Module Mercedes W176 Automatic Transmission Unit ECU A2469004313

PLN 61.95

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Part no. 9372556

BMW G11 Door Wiring Harness Rear Left Right Door N/O/S Wiring Loom 9372556

PLN 108.95

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Part no. 7P6907357B

Volkswagen Golf Mk7 Headlight Head Lamp Range Control Unit Module ECU 7P6907357D

PLN 189.95

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Part no. 8058634

Engine Wiring BMW X3 M F97 X4 M F98 Loom Harness Ignition Module 8058634

PLN 474.95

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Part no. 8510221-1

BMW E90 E91 LCI E92 325d Diesel N57 204HP ECU Engine Kit DDE 8510221 CAS3 + Key

PLN 949.95

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Part no. 9177195

BMW E65 E66 X5 E70 X6 E71 Video TV Tuner Module Control Unit ECU 9177195

PLN 1,044.95

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Part no. 8605144

BMW F20 F21 LCI F23 F30 F32 F33 Engine Wiring Loom Harness Cable 8605144

PLN 237.95

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Part no. 6904620

BMW 7 Series E65 E66 Diversity Antenna Tuner Amplifier Wiring 6904620

PLN 18.95

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Part no. 9240508

Fuse Map BMW X5 X6 E70 E71 Assignment Grouping Card 9240508

PLN 42.95

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Part no. A1245401850

Mercedes W124 M103.940 Engine Fuse Box Module Unit A1245401850

PLN 332.95

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Part no. 7512967-1

Mini Cooper R50 R52 R53 Base B Terminal Point Engine Compartment 7512967

PLN 61.95

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Part no. 8514032

BMW X3 F25 X4 F26 Diesel B47 Alternator Starter Wiring Holder Cover 8514032

PLN 42.95

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Part no. A2199001100

Mercedes W219 Head Unit CD Player Navigation COMAND Radio Audio Unit A2199001100

PLN 1,139.95

Free delivery - Tue, Jan 13

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Part no. 6960000

BMW X5 Series E53 Front Bumper PDC Loom Cables Wiring Set 6960000

PLN 237.95

Free delivery - Tue, Jan 13

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Part no. 8678964

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

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. 4H0959591A

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

PLN 123.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A2229001809

Mercedes W205 W222 Door Module Front Left N/S Control Unit ECU A2229001809

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8809737

PDC Wiring BMW X4M F98 G02 Rear Bumper Parking Assistance Sensor Harness 8809737

PLN 379.95

Free delivery - Tue, Jan 13

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Part no. 9170453

BMW X5 E70 Footwell ECU Light Control Module Xenon FRM II Lear 9170453

PLN 379.95

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Part no. 8630168

BMW 3 F30 LCI 330e Hybrid Charging Control Unit Bracket Holder Mount 8630168

PLN 94.95

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Part no. 1405523

Mini One D R50 R53 Cooper S Fuse Box 1405523

PLN 47.95

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Part no. 6970908

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

PLN 75.95

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Part no. A2465401350

Fuse Box Mercedes W156 W176 W246 Front Relay Control Unit Module A2465401350

PLN 47.95

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Part no. A2129000217

Mercedes W212 Radio Head Unit Navi CD Player Control Unit A2129000217

PLN 949.95

Free delivery - Tue, Jan 13

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Part no. 130831041000

Audi A5 8T Headlight Inner LED Inner Module Unit 6NHM0000 130831041000

PLN 123.95

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Part no. 1388911-3

BMW E36 E38 E85 Mini R52 R57 5x Change-Over Contact Relay Violet Set 1388911

PLN 61.95

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Part no. E92-PDC-WIRING-LOOM-HARNESS-REAR-BUMPER-2

BMW E92 E92N LCI PDC Wiring Loom Harness Rear Bumper

PLN 42.95

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Part no. 8K0959793S

Audi A4 B8 Front Door Control Module Unit ECU 8K0959793S

PLN 42.95

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Part no. 8W1959595D

Audi Q5 FY Rear Door Control Module Unit Left Right N/O/S 8W1959595D

PLN 42.95

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Part no. 8574024

Engine Wiring BMW F30 F31 335dX N57Z Automatic Gearbox Cable Harness 8574024

PLN 151.95

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Part no. 9186211

BMW X5 E70 M Audio Professional Radio CD Player Navigation Head Unit 9186211

PLN 474.95

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Part no. 8T0959793K

Audi A4 B8 A5 8T Door Control Unit Module Front Driver's Side 8T0959793K

PLN 42.95

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Part no. 6R0915181E

Audi A1 8X Battery Cable Loom Harness Wiring Negative Terminal 6R0915181E

PLN 42.95

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Part no. 8T0959792P

Audi A5 8T Front Door Control Module Right O/S Passenger Side 8T0959792Q

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. 167859

BMW X5 Series E53 Widescreen Motorway and Trunk Road Unit Module 167859

PLN 93.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4H0035225

Audi A8L 4H Aerial Antenna Amplifier AMP Booster Module 4H0035225

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 9228914

Radio CD Player BMW F10 F11 F13 Navigation ECE Sat Nav Head Unit 9228914

PLN 949.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4F0959792R

Audi A6 C6 Front Door Left N/S Module Unit Control ECU 4F0959792R

PLN 42.95

Delivery - Tue, Jan 13

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Part no. 9243637

BMW X3 F25 Rear Bumper PDC Wiring Loom Parking Sensor Cable Harness 9243637

PLN 189.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8368932

BMW E39 Alarm Sensor Comfort Control Module Unit ECU 55892110

PLN 100.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 6C0907159B

Volkswagen Polo 6C Body Sound Impact Control Module ECU 6C0907159B

PLN 118.95

Free delivery - Tue, Jan 13

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Part no. A2108207626

Mercedes-Benz C E W202 W210 Front Right Door O/S Control Module A2108207626

PLN 42.95

Delivery - Tue, Jan 13

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Part no. A2469064201

Antenna Amplifier Mercedes X117 W176 W205 Rear Aerial Module A2469064201

PLN 127.95

Free delivery - Tue, Jan 13

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Part no. 6932644-1

BMW 3 5 Series E60 E71 E90 E92 Suppression Filter Aerial Module Antenna 6932644

PLN 47.95

Delivery - Tue, Jan 13

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Part no. 7606628

BMW F10 M5 F06 F12 F13 M6 S63N Engine Alternator Generator 14V 210A 7606628

PLN 332.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8378113

BMW Z4 Series E85 E86 Interior Fuse Box 8378113

PLN 66.95

Free delivery - Tue, Jan 13

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Part no. A2219004704

Mercedes-Benz S W221 Comand 6-Changer CD Radio Head Unit DVD Navi A2219004704

PLN 2,849.95

Free delivery - Tue, Jan 13

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Part no. 7P0941828B

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

PLN 161.95

Free delivery - Tue, Jan 13

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Part no. 9267535

BMW X3 F25 Body Control Module ECU Junction Box JBBFE III 3 V9 Lear 9267535

PLN 113.95

Free delivery - Tue, Jan 13

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Part no. A4475402231

Mercedes W447 Sliding Door Wiring Loom Harness Right O/S A4475402231

PLN 113.95

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Part no. A1698207426

Mercedes-Benz A B Class W169 W245 Door Control Unit Right O/S Rear A1698207426

PLN 47.95

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Part no. 8S0907468D

Audi TT FV Mk3 8S Gateway Module Interface Data Bus Control Unit 8S0907468D

PLN 184.95

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Part no. 2Q0915181B

Seat Ibiza Mk5 Negative Battery Terminal Cable Lead 2Q0915181B

PLN 42.95

Delivery - Tue, Jan 13

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Part no. 6867168

BMW 1 2 Series F20 F21 F30 F31 N13 N47N ECU ICM Control Unit Module 6867168

PLN 75.95

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Part no. 7075944-2

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

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A6402002770-1

Alternator Belt Tensioner Mercedes W169 W245 OM640 Diesel Holder Mounting Panel

PLN 112.95

Free delivery - Tue, Jan 13

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Part no. 9362398

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

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. 5Q0937125A

Fuse Relay Box Volkswagen Audi Skoda Seat Engine Bay Supply Unit 5Q0937125A

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. 6929916

BMW E63 E64 Rear Bumper PDC Cables Set Wiring Loom Harness 6929916

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. 5QS919298

Audi A3 S3 8Y VW Caddy SB Mk4 Parking Sensor Module Control Unit 5QS919298

PLN 569.95

Free delivery - Tue, Jan 13

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Part no. 8617239

Gearbox Module Mini R55 R56 LCI R60 Automatic Transmission Unit EGS 8617239

PLN 275.95

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Part no. 9221462

BMW F01 Front Seat Control Unit Module ECU Left Temic 9221462

PLN 61.95

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Part no. DE8T19H463DC

Ford Transit Connect Mk2 Rain Sensor Control Unit Module FoMoCo DE8T-19H463-DC

PLN 42.95

Delivery - Tue, Jan 13

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Part no. A2135403205

Lever Sensor Wiring Mercedes W213 C238 Rear Left Right N/O/S Cable A2135403205

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A2118206185

Mercedes E S Class W211 W220 Telephone Hands Free Control Module A2118206185

PLN 47.95

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Part no. 3457434-1

Mini Cooper One R55 R56 R57 LCI R60 Radio Boost CD Player Head Unit 3457434

PLN 949.95

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Part no. 6700003892

Smart Fortwo C453 Power Steering Column Control Unit Module 6700003892

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A9075402087

Mercedes W907 Starter Wiring Battery Alternator Cable Harness Loom A9075401305

PLN 227.95

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Part no. 9356156

External Ignition Base BMW F20 F30 F32 F33 Power Terminal Distribution 9356156

PLN 42.95

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Part no. A0005463704

Mercedes C118 Positive Pole Battery Insulating Cap Cover Trim A0005463704

PLN 42.95

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Part no. 5Q0971230DT

Volkswagen Golf Mk7 Alternator Wiring Harness Loom Cable 1.4 TSI 5Q0971230DT

PLN 42.95

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Part no. 4H0937517

Audi A8L 4H Fuse Relay Battery Junction Box Housing 4H0937517

PLN 284.95

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Part no. A9068270005

Mercedes W639 W906 Voltage Stabilizer Control Unit Module A9068270005

PLN 66.95

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Part no. 6955116-BAQ

BMW 1 3 Series E81 E82 E87 E88 E90 E91 Ultrasonic Sensor PDC Barriquerot 6955116

PLN 47.95

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Part no. 95B919606E

Porsche Macan 95B MMI Multimedia Navigation Control Head Unit 95B919606E

PLN 1,424.95

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Part no. 4F0035503E

Audi A4 B8 Transmitting Receiving Unit Road Toll System 4F0035503E

PLN 189.95

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Part no. A1765405608

Mercedes-Benz A-Class W176 Rear Right Door Wiring Cable A1765405608

PLN 42.95

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Part no. A2118703485

Mercedes W211 Door Module Rear Right O/S Control Unit ECU A2118703485

PLN 47.95

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Part no. BK2T18D815GD-1

Ford Transit Custom MK8 Radio Stereo Audio USB Head Unit Panel BK2T18D815GD

PLN 180.95

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Part no. 3456478

Mini R58 Door Module Harness Wiring Loom Cable Set Driver's Side 3456478

PLN 94.95

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Part no. A2075451740

Mercedes-Benz A207 W207 Cabrio Control Unit Module Bracket Holder A2075451740

PLN 66.95

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Part no. 95B971030FP

Porsche Macan 95B Door Wiring Harness Loom Cable 95B971030FP

PLN 284.95

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Part no. 6947216

BMW 3 Series E93 Convertible Rear Bumper FM Radio Aerial Antenna 6947216

PLN 75.95

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Part no. 4L0959795B

Audi Q7 4L Door Control Module Unit ECU Rear Left N/S 4L0959795B

PLN 61.95

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Part no. A2139003029

Mercedes A238 Fuse Box Control Unit SAM Module Relay A2139003029

PLN 379.95

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Part no. 9364638

Mini Cooper One F54 F55 F56 F60 ECU Body Domain Controller BDC Module 9364638

PLN 522.95

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Part no. 7543297

BMW 5 6 Series E60 E61 E63 E64 N52 Cable Alternator Starter Base B

PLN 42.95

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Showing 3070-3168 of 12190 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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