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. 7556880

Engine Wiring BMW Z4 E85 E86 Petrol N52 Loom Harness Module Manual 7556880

€227.95

Free delivery: Mar 6 – 11

If paid before 14:00

Part no. A1645403230

Mercedes ML W164 Positive Battery Terminal Cable Lead Wiring A1645403230

€37.95

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Part no. 8387568

BMW 7 Series E65 E66 Battery B Engine Compartment Terminal Point 8387568

€23.95

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Part no. 000051446C

VW Volkswagen Golf Mk6 5K Digital Media Adapter Cable Wiring Loom 000051446C

€23.95

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Part no. 8T0035462

Audi A5 8T MMI Multimedia Interface Unit Module Control ECU 8T0035462

€23.95

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Part no. A2049000300

Mercedes W212 Media Interface Control Unit Module Communication A2049000300

€23.95

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Part no. 4N0035736A

Audi A6 C8 SD SIM Card Double Twin USB Module Multimedia Reader Port 4N0035736A

€47.95

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Part no. 6872066

Mini F54 F60 Trailer Towing Control Module Cover Bracket Mounting 6872066

€23.95

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Part no. 5Q0907530D

Volkswagen VW Golf Mk7 Gateway Control Unit Module 5Q0907530D

€23.95

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Part no. A9065420044

Mercedes W906 Bracket Mount Fuse Distribution Box A9065420044

€23.95

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Part no. A2059004013

Mercedes W205 Air Conditioning Control Module A/C ECU Unit A2059004013

€23.95

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Part no. A1175401205

Mercedes C117 Drivers Door Wiring Harness A1175401205

€28.95

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Part no. 6800903-2

Mini R50 R52 R53 Steering Wheel Horn Switch Left Right N/O/S Set 6800903

€32.95

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Part no. 6821205

Battery Wire Mini Cooper F55 F56 F57 IBS Negative Battery Lead Cable 6821205

€23.95

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Part no. A2045402610

Mercedes W204 Cable Harness Rear Door Panel Card Wiring Loom A2045402610

€23.95

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Part no. AV6Q6M0

Ford Transit Connect Mk2 Glow Plug Wiring Harness Engine AV6Q6M0

€23.95

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Part no. A1769052400-1

Mercedes W176 Pressure Crash Impact Sensor Control Module A1769052400

€56.95

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Part no. A4159007503

Mercedes Citan W415 Body Control Module Unit BCM ECU A4159007503 284B18276R

€237.95

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Part no. 8506281-1

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

€94.95

Free delivery: Mar 6 – 11

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Part no. 1K8955557

Volkswagen Scirocco Mk3 Door Crash Impact Pressure Sensor Unit 1K8955557

€23.95

Free delivery: Mar 6 – 11

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Part no. 9381445

Mini Cooper F55 F56 F57 IBS Negative Battery Lead Cable 9381445

€23.95

Free delivery: Mar 6 – 11

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Part no. 4H0959793F

VW Touareg 7P Front Door Control Module Unit ECU Driver's Side 4H0959793F

€23.95

Free delivery: Mar 6 – 11

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Part no. 4M0971237S

Audi Q7 4M Q8 Mk1 Battery Negative Cable Wiring Earth Line 4M0971237S

€37.95

Free delivery: Mar 6 – 11

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Part no. 4E0941817A

Audi RS4 B8 Front Door Wiring Harness Loom Plug Socket 4E0941817A

€23.95

Free delivery: Mar 6 – 11

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Part no. 4E0910552G

Audi S8 D3 5.2 FSI 450HP BSM Quattro Engine Unit ECU 4E0910552G Automatic

€379.95

Free delivery: Mar 6 – 11

If paid before 14:00

Part no. A2108208726

Mercedes-Benz W210 S210 Alarm Anti Theft System Control Module Unit A2108208726

€23.95

Free delivery: Mar 6 – 11

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Part no. 9G9T-14240-HBB

Ford Mondeo Mk4 Door Wiring Harness Loom Cable Rear Right O/S 9G9T-14240-HBB

€23.95

Free delivery: Mar 6 – 11

If paid before 14:00

Part no. A1568200089

Mercedes W176 W246 Tailgate Aerial Antenna Amplifier Unit A1568200089

€23.95

Free delivery: Mar 6 – 11

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Part no. 5Q0937084M

Volkswagen VW Golf Mk7 BCM Convenience Body Control Module Unit ECU 5Q0937084M

€37.95

Free delivery: Mar 6 – 11

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Part no. EJ32-10E889-CA

Range Rover Evoque L538 Display Capacitive Screen Unit EJ3210E889CA

€85.95

Free delivery: Mar 6 – 11

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Part no. 9252813

BMW 5 7 Series F01 F02 F10 F11 Power Distribution Fuse Box Rear 9252813

€28.95

Free delivery: Mar 6 – 11

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Part no. A2055408104

Battery Cable Mercedes W205 X253 Diesel OM651 Alternator Wiring A2055408104

€28.95

Free delivery: Mar 6 – 11

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Part no. A1635408905

Mercedes-Benz M-Class ML W163 Rear Axle Brake Wiring Loom Harness A1635408905

€23.95

Free delivery: Mar 6 – 11

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Part no. 04C903023L

Audi A1 8X 1.2 TFSI CBZA Petrol Engine Alternator Generator 04C903023L

€32.95

Free delivery: Mar 6 – 11

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Part no. 8577238

BMW F30 F31 Sterter Motor Alternator Cable Wiring Loom Harness 8577238

€28.95

Free delivery: Mar 6 – 11

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Part no. 9187541-1

BMW E88 ECU Body Control Module H3 PL2 JBBFE II Junction Box 9187541

€32.95

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Part no. 6976964

BMW 3 5 X5 Series E39 E46 E53 BMW Radio Professional TMC Unit 6976963

€227.95

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Part no. A1765450000

Mercedes-Benz A-Class W176 Bluetooth Unit Module Bracket Holder A1765450000

€23.95

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Part no. 9436289

BMW G20 G21 Rear Door Wiring Loom Cable Control Unit Left Right N/O/S 8718245

€32.95

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Part no. 6964141

BMW 7 Series E65 E66 E67 Control Unit Module Door Front Driver Side 6964141

€23.95

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Part no. 7798006

BMW E60 E61 E87 LCI E81 E82 X1 E84 E90 E91 N47 Diesel Starter Motor 7798006

€23.95

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Part no. 9226901

Body Control Module BMW F01 ECU Junction Box PL6 JBBFE III 3 Lear 9226901

€56.95

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Part no. 3455304

Mini R57 Cabrio DWA Door Alarm Theft Deterrent System Unit 3455304

€23.95

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Part no. A2789060600

Mercedes W166 R172 W205 C207 W212 C216 Engine Starter Motor 12V A2789060600

€51.95

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Part no. 8K0971228H

Audi A4 B8 3.0 TDI Starter Alternator Wiring Loom Cable Harness 8K0971228H

€23.95

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Part no. 9136726

BMW Mini Cooper One R55 R56 Multifuse B Battery Power Distributor 9136726

€23.95

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Part no. A0035453501

Mercedes Vaneo W414 Sprinter W901 W902 W903 Fuse Box Battery A0035453501

€23.95

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Part no. 8K590735700

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

€23.95

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Part no. 6933529

BMW 5 Series E60 E61 Centre Console Switch Centre DSC 6933529

€23.95

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Part no. 8584276

BMW F30 F31 320d Engine Control Unit ECU DDE ed Diesel N47N 163HP 8584276

€80.95

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Part no. 8XA971679C

Audi A1 8X Dashboard Glove Box Wiring Loom Cable Storage Harness 8XA971679C

€23.95

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Part no. A0018275101

Mercedes W164 Tyre Pressure Sensor Rear Right Left Antenna Module A0018275101

€23.95

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Part no. 5Q0959655C

Volkswagen Golf Mk7 5G Impact Crash Air Module Sensor 5Q0959655C

€213.95

Free delivery: Mar 6 – 11

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Part no. 4M0959795N

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

€32.95

Free delivery: Mar 6 – 11

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Part no. 9384214

BMW F10 ECU Body Control Module V2 PL6 JBBFE III Junction Box 9384214

€66.95

Free delivery: Mar 6 – 11

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Part no. 8506444-3

BMW E90 E91 LCI E92 330d Diesel N57 245HP ECU Engine Kit DDE 8506444 CAS3 + Key

€256.95

Free delivery: Mar 6 – 11

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Part no. 9199305

KaFAS Camera BMW F10 F11 Rear View Control Unit Module 9199305

€89.95

Free delivery: Mar 6 – 11

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Part no. 6926435

BMW 1 3 Series E87 E90 Mini R56 R57 Seat Control Unit Module Heating 6926435

€23.95

Free delivery: Mar 6 – 11

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Part no. A2218708992

Mercedes W221 C216 Telephone Bluetooth Connection Control Module A2218708992

€32.95

Free delivery: Mar 6 – 11

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Part no. 8573116

BMW 5 Series F10 F11 LCI B47 Cable Alternator Starter 8573116

€23.95

Free delivery: Mar 6 – 11

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Part no. 8585380-1

BMW F30 330d F32 430d N57N 258HP Control Unit ECU Kit DDE 8585380 FEM Key

€284.95

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Part no. 8636596

BMW 1 3 Series F20 F21 F30 F31 Line Cable Power Distribution Module 8636596

€23.95

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Part no. 8796289

BMW X3 G01 X4 G02 X5 G05 Battery Terminal Negative Cable Wire Wiring 8796289

€28.95

Free delivery: Mar 6 – 11

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Part no. 04L903021G

Audi Q2 GA Diesel Engine Alternator Generator Assembly Bosch 04L903024T

€47.95

Free delivery: Mar 6 – 11

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Part no. 8621500

BMW F20 F21 F30 LCI Petrol N13 N20 Cable Alternator Starter Base B+ 8621500

€28.95

Free delivery: Mar 6 – 11

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Part no. 6766003

BMW X3 E83 Z4 E85 E86 Fuel Pump Module Control Unit 6766003

€23.95

Free delivery: Mar 6 – 11

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Part no. 4H0959792F

VW Touareg 7P Front Door Control Module Unit ECU Passenger Side 4H0959792F

€23.95

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Part no. 3D0907040H

VW Volkswagen Phaeton 3D Climate Air Conditioning Control Module Unit 3D0907040H

€23.95

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Part no. 9116978

BMW X5 Series E70 Cable Loom Door Rear Left Right N/O/S Wiring Harness 9116978

€23.95

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Part no. 06E971627T

Audi A6 C7 2.8 FSI CHVA Petrol Engine Wiring Loom Harness Cable 06E971627T

€23.95

Free delivery: Mar 6 – 11

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Part no. 8685853

BMW F40 X1 F48 Mini F55 F56 F60 Engine Injector Wiring Loom Harness 8685853

€85.95

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Part no. 8X0971036BS

Audi A1 8X Door Card Wiring Harness Loom Cable Front Passenger Side 8X0971036BS

€23.95

Free delivery: Mar 6 – 11

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Part no. A1725400035

Electrical Cable Mercedes R172 Transmission To Body Wiring Harness A1725400035

€23.95

Free delivery: Mar 6 – 11

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Part no. 8P4963553A

Audi A3 8P Front Seat Occupation Sensor Left Right N/O/S 8P4963553A

€28.95

Free delivery: Mar 6 – 11

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Part no. A1715409245

Mercedes SLK R171 Gateway Control Unit Gateway Module ECU A1715409245

€37.95

Free delivery: Mar 6 – 11

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Part no. 9359013

Control Unit BMW F01 F02 F07 F10 F11 CAS4 Key Reading Module 9359013

€75.95

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Part no. A1679003118

Door Module Mercedes W205 W213 X253 Front Right O/S Control Unit A1679003118

€75.95

Free delivery: Mar 6 – 11

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Part no. A9075400500

Mercedes W907 Battery Cable Wiring Loom Harness Cabling A9075400500

€75.95

Free delivery: Mar 6 – 11

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Part no. A1679008309

Mercedes W177 W247 Telematics Module Communication Control Unit A1679008309

€42.95

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Part no. 9253637

BMW 3 5 Series F10 F11 F30 F31 Airbag Control Unit Module 9253637 65779253637

€23.95

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Part no. A0009002308

Mercedes W447 W906 Adblue Module Exhaust Gas Control Unit ECU A0009002308

€89.95

Free delivery: Mar 6 – 11

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Part no. 8663284

BMW F20 F30 F31 LCI B38 ECU Basic DME Control Unit Automatic Gearbox 8663284

€313.95

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Part no. A6397600104

Bowden Cable Mercedes W639 Vito Door Handle Catch Top Rear Left Wire A6397600104

€23.95

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Part no. 7799855-2

BMW 1 3 5 Series E60 E87 E90 M47N2 120d 320d 520d ECU Kit DDE CAS2 Key 7799855

€541.95

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Part no. A2079001100

Door Module Mercedes C207 W207 Front Left N/S Control Unit ECU A2079001100

€23.95

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Part no. A0009004839

Mercedes C118 W177 C247 Battery Control Module Unit ECU A0009004839

€284.95

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Part no. 8R0907468N

Audi A5 8T Gateway Control Module Unit ECU 8R0907468N

€28.95

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Part no. 9811263

Mini Cooper R60 Wiring Loom Front Door Cables Passenger Side 9811263

€23.95

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Part no. 4F1941824A

Audi A5 F5 Fuse Box Control Module Connector Plug Socket Wiring Loom 4F1941824A

€23.95

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Part no. 9294912

BMW F10 F11 X5 F15 X6 F16 Rear Seat Compartment Screen Display SET 9294912

€569.95

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Part no. 7799470

Wiring Bracket BMW E60 E61 X3 E83 Diesel Engine Harness Cable Loom Mount 7799470

€23.95

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Part no. 1K0906381

Audi Seat Skoda Volkswagen Relay Multi Use Grey 1K0906381

€23.95

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Part no. 2HJ962211N

Volkswagen Amarok Mk2 Engine Earth Ground Wiring Harnes Cable MB3T-18C942-BF

€23.95

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Part no. 9184810

BMW X6 E71 Wiring Set Wash Water Container Cable Loom 9184810

€23.95

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Part no. 6938664

BMW E65 E66 Control Unit Front Centre Console Module 6938664

€23.95

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Part no. 6927025-1

Window Lifter Drive BMW E87 E90 E91 Motor Rear Left 6927025

€23.95

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Part no. 6925966-2

BMW X3 E83 LCi Rear Door Window Lifter Right O/S 6925966

€23.95

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Part no. 9325884

BMW F36 Door Cable Front Driver's Door Wiring Loom Harness 9325884

€23.95

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Part no. 9236460

BMW F10 Footwell Light Module Control Unit ECU FRM III 9236460

€75.95

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Showing 1288-1386 of 13731 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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