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. 3D0035465

VW Volkswagen Phaeton Mk1 Mulitmedia Audio Sound System Amplifier Unit 3D0035465

€23.95

Free delivery: Mar 10 – 11

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Part no. DE93-2C444-BA

Ford Focus Mk3 Brake Servo Air Pressure Sensor DE93-2C444-BA A2C53428844

€23.95

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Part no. 8K0937517B

Audi RS4 B8 Positive Battery Distribution Terminal Junction Relay Box 8K0937517B

€23.95

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Part no. AH22-19C166-AA

Land Rover Discovery 4 L319 USB iPod Port Socket AH22-19C166-AA

€23.95

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Part no. 4E0862336MX

Audi S4 B8 Bluetooth Telephone Control Module ECU 4E0910336MX 4E0862335

€51.95

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Part no. 2130769

Ford Ranger Wildtrak Mk6 Battery Positive Lead Cable Harness Wire HB3T-14300-BA

€56.95

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Part no. A9075402087

Mercedes W907 Starter Wiring Battery Alternator Cable Harness Loom A9075401305

€61.95

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Part no. 1K8971104F

Volkswagen Scirocco Mk3 Rear PDC Parking Sensor Wiring Harness Loom 1K8971104F

€37.95

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Part no. 7P0927601A

Audi Q7 4L Volkswagen Touareg 7P Oil Pump Control Module Unit ECU 7P0927601A

€23.95

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Part no. 7853357

Engine Wiring BMW F87 M2 N55 Petrol Loom Module 1 Harness Cable 7853357

€170.95

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Part no. 8380409

BMW X5 E53 Fuse Distribution Box Relay Board 6907395 8380409 6909721

€23.95

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Part no. 9140942-BAR1

BMW E87 E90 E91 LCI Rear PDC Ultrasonic Parking Sensor SET X2 Barberarot - A39

€28.95

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Part no. 6958526-1

BMW 5 X5 X6 Series 1 E60 E61 E70 E71 F10 F11 Seat Adjustment Switch Right O/S

€23.95

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Part no. 95B837462B

Porsche Macan 95B Front Door Window Lifter Regulator Right O/S 95B837462B

€70.95

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Part no. 95504490277

Porsche Cayenne 955 Telematics Bluetooth Telephone Module Unit 95504490277

€56.95

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Part no. A1769980001

Door Wiring Plug Mercedes W176 W246 Cable Lead Connector A1769980001

€23.95

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Part no. A1665404802

Mercedes W166 Front Seat Headrest Wiring Cable Harness A1665404802

€23.95

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Part no. 9359014

BMW F25 Car Access Key Reading Module Control Unit ECU CAS4 CG+ELV 9359014

€47.95

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Part no. 6R0959772A

Audi A1 S1 8X Heated Seat Control Unit Relay Module Unit 6R0959772A

€28.95

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Part no. AH42-15K603-AA

Range Rover L405 Aerial Antenna Control Unit Keyless Entry AH42-15K603-AA

€23.95

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Part no. 8611289

Mini Cooper S R56 JCW Coolant Thermostat Adapter Wiring Cable 8611289

€28.95

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Part no. 3R0907279

Seat Exeo On Board Power Supply Control Unit ECU 3R0907279

€165.95

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Part no. 3R0971095

Seat Exeo 3R Front Bumper Wiring Loom Harness Cable 3R0971095

€42.95

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Part no. 9317866

BMW 3 Series F30 330e Hybrid Battery Accumulator Bracket Holder Mount 9317866

€23.95

Free delivery: Mar 10 – 11

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Part no. 8506442

BMW E81 E82 E87 LCI E88 123d Petrol N47S 204HP ECU Engine DDE 8506442 Manual

€165.95

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Part no. 9475146

BMW F20 F21 F22 F23 F30 Rain Light Sensor Windscreen Wiper 9475146

€47.95

Free delivery: Mar 10 – 11

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Part no. 1S0919275-DGR

Audi A5 8T Parking Sensor Control Module Daytona Grey Metallic - Z7S 1S0919275

€23.95

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Part no. 9389286

Door Wiring Mini Clubman F54 Front Passanger Side N/S Door Harness 9389286

€32.95

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Part no. 6932399

BMW X5 E53 Cable Loom Plug Socket Connector Wiring Harness 6932399 6932396

€23.95

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Part no. A1645403572-1

Mercedes W164 W251 Fuse Box Relay Module Control Unit A1645403572

€170.95

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Part no. 9123739

BMW 1 3 5 7 Series E81 E87 E90 E91 E92 F01 USB USB Hub Audio Interface Module

€23.95

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Part no. 7605076

BMW F06 F10 F11 F12 F13 Wiring Harness Cable Engine Ignition Module N55 7605076

€75.95

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Part no. 2K5951172

VW Volkswagen Caddy Maxi Interior Roof Alarm Sensor Module Unit 2K5951172

€108.95

Free delivery: Mar 10 – 11

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Part no. A2478207502

Mercedes C118 W177 W243 W247 Centre Console Dual USB-C Socket Ports A2478207502

€32.95

Free delivery: Mar 10 – 11

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Part no. 5N0035342E

VW Volkswagen Polo 6R Multimedia Electronic Control Interface Module 5N0035342E

€23.95

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Part no. 7187221

BMW F01 F02 F03 LCI Rear Third Stoplamp Stop Lamp Brake Light 7187221

€23.95

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Part no. 9339823

BMW X3 G01 G11 G12 G30 G31 Battery Positive Terminal Pint Jump Start 9339823

€23.95

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Part no. HK72-19C164-ZD

Land Rover Discovery Sport L550 Audio Speaker Amplifier HK72-19C164-ZD

€241.95

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Part no. A6519000700-3

Mercedes W906 310 CDI OM651.955 95HP Engine Unit ECU Kit A6519000700 Key Lock

€393.95

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Part no. 8H42-10E887-AB

Land Rover Discovery 3 L319 Sat Navi Navigation DVD Drive Reader 8H42-10E887-AB

€37.95

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Part no. 8639583-1

BMW F20 F21 F30 LCI M140i 340i B58 Wiring Harness Motor Sensor Module 8639583

€180.95

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Part no. 9142400

BMW Mini Cooper R55 R56 R57 Passenger's Door Module Cables N/S 9142400

€23.95

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Part no. A1729007313

Mercedes SLC R172 PDC Parking Sensor Module Unit ECU A1729007313

€75.95

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Part no. B67824524

Mercedes W164 Media Interface Connection Cable MI AUX Wiring B67824524

€23.95

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Part no. 6850955

Brake Control Unit BMW F10 F11 X3 F25 Parking Brake Handbrake Module EMF 6850955

€23.95

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Part no. 9491592-1

BMW F22 F23 F87 Rear Tail Light Lamp LED Wiring Loom Right O/S 9491592

€23.95

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Part no. 7583740

BMW Z4 E89 Earth Battery Cable Wiring Loom Harness Line 7583740

€23.95

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Part no. BJ32-17509-AC

Range Rover Evoque L538 Control Unit Module BJ32-17509-AC

€23.95

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Part no. 7N0941329

Audi A3 8V 30 TDI DGTE Ad Blue Reducer Dosage Control Module Unit ECU 7N0941329

€23.95

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Part no. 4F0919813E

Audi A4 B8 Chip Card Reader for Road Toll ETC Japan Module Unit 4F0919813E

€37.95

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Part no. 9393660

BMW F10 Central Gateway Module Control Unit Lear ZGW-02 4SK 9393660

€51.95

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Part no. 6960308

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

€23.95

Free delivery: Mar 10 – 11

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Part no. A2469064201

Antenna Amplifier Mercedes X117 W176 W205 Rear Aerial Module A2469064201

€32.95

Free delivery: Mar 10 – 11

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Part no. 7856819

Battery Cable BMW F90 M5 F91 M8 Wire Lead Positive Alternator Starter B+ 7856819

€28.95

Free delivery: Mar 10 – 11

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Part no. 7P0937211A

Porsche Cayenne 92A 3.0 TDI Fuse Box Relay Control Module 7P0937211A

€23.95

Free delivery: Mar 10 – 11

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Part no. 8V5971687Q

Audi A3 8V Door Wiring Harness Loom Rear Left Right N/O/S 8V5971687Q

€32.95

Free delivery: Mar 10 – 11

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Part no. 4F1971036A

Audi A6 C6 Front Passenger Door Wiring Left N/S Harness Loom Cable 4F1971036A

€23.95

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Part no. A0001502780

Mercedes W203 CL203 W204 M272 Petrol Ignition Coil Cable Connector A0001502780

€23.95

Free delivery: Mar 10 – 11

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Part no. 5WA959436P

Volkswagen Golf CD1 Keyless Go Module ECU Entry Control Unit 5WA959436P

€32.95

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Part no. AV1T-14A584-CDD

Ford B-Max Door Loom Wiring Harness Cable Driver Side Front AV1T-14A584-CDD

€28.95

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Part no. 03L911024B

Audi A6 C7 2.0 TDI CGLC Diesel Starter Motor 03L911024B

€23.95

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Part no. A2124400414

Mercedes C207 W207 W212 Fuel Pump Module Diesel Control Unit ECU A2124400414

€28.95

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Part no. DPLA-15C859-DL

Range Rover Evoque L538 PDC Parking Sensor Control Unit DPLA-15C859-DL

€32.95

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Part no. EJ32-14301-AC

Range Rover Evoque L538 2.2 TDCi Negative Battery Cable Terminal EJ32-14301-AC

€23.95

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Part no. A1779069601

Mercedes W177 W247 Fuse Box Front Relay Engine Control Unit Module A1779069601

€42.95

Free delivery: Mar 10 – 11

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Part no. 9225014-1

BMW F23 F30 Distributor External Ignition Base Control Unit Module 9225014

€23.95

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Part no. A2465401350

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

€28.95

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Part no. 7M0951253A-1

Audi VW Volkswagen Seat Relay Unit Module 4 Pins Set x2 7M0951253A

€23.95

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Part no. A2829003300-1

Mercedes W177 A180 282.914 136HP Petrol ECU Kit A2829003300 Key BCM Automatic

€246.95

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Part no. A6079002200-2

Mercedes W176 A180 CDI OM607 109HP BlueEFFICIENCY Engine Unit ECU A6079002200

€113.95

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Part no. 6905950

BMW X5 Series E53 Spoiler Dualband Antenna Amplifier Aerial 6905950

€23.95

Free delivery: Mar 10 – 11

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Part no. 7550967

BMW E81 E90 E91 E60 Petrol Alternator Generator 150A 7550967

€61.95

Free delivery: Mar 10 – 11

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Part no. 7835431

Carrier Air Conditioner BMW E60 M5 E61N E63 E64 M6 Compressor 7835431

€23.95

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Part no. 6990090

BMW E61 E63 E90 E92 F06 Mini R55 R56 Trap Circuit Antenna 6990090

€23.95

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Part no. 079903805J

Audi A4 B6 B7 4.2 V8 FSI Alternator Bracket Mount Holder 079903805J

€23.95

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Part no. 9247081

BMW X1 E84 Wiring Loom Harness Passenger Side 9247081

€23.95

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Part no. 6927311

BMW E60 Front Seat Control Unit Module Controller ECU 6927311

€23.95

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Part no. 7520912-1

BMW E60 E61 E63 E64 LCI Lid Cover Panel Electronic Box 7520912

€23.95

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Part no. 6940763

BMW 7 Series E65 E66 E67 Ultra Sonic-Module 6940763

€23.95

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Part no. A4535408304

Smart Fortwo C453 Front Bumper Wiring Parking Sensor Loom Harness A4535408304

€66.95

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Part no. 8573260-1

BMW F20 F21 116d ed Diesel N47N 116HP Engine Control ECU DDE 8573260 Manual

€71.95

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Part no. 8T0919611-1

Audi A4 B8 Head Unit Media Player Controller Knob Switch Panel 8T0919611

€66.95

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Part no. EJ32-14B673-AB

Land Rover Evoque L538 Tailgate Control Module Unit ECU J32-14B673-AB

€37.95

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Part no. BJ32-10C652-AA

Range Rover Evoque L538 Negative Battery Cable Battery To Earth BJ3210C652AA

€37.95

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Part no. 4N0907064DD

Audi A6 C8 Body Control Comfort Unit Module BCM Convenience Unit ECU 4N0907064DD

€113.95

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Part no. A2215401633

Mercedes W221 Door Harness Cable Loom Wire Wiring Rear Left N/S A2215401633

€42.95

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Part no. 6952477

BMW 5 Series E60 E61 Centre Console Switch Centre DTC PDC 6952477

€23.95

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Part no. 4G5035225

Audi A6 C7 Aerial Roof Booster Antenna Amplifier AMP 4G5035225

€23.95

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Part no. A1729060005

Mercedes R172 Rear SAM Fuse Relay Box A1729060005

€89.95

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Part no. 9210860

BMW X3 F25 Rear Fuse Box Power Distribution Control Unit Box 9210860

€23.95

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Part no. A2135452840

Mercedes W213 ECU Bracket Control Unit Module Holder Mount A2135452840

€23.95

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Part no. GU5T-14B192-GA

Ford Transit Mk8 Relay High Power 4-Pin Black FoMoCo GU5T-14B192-GA 4RA933714

€23.95

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Part no. A2045455640

Mercedes Benz C E W204 W207 Control Unit Module SAM Bracket Mount A2045455640

€23.95

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Part no. 3Q0959354

Seat Leon Mk3 Door Crash Impact Sensor Front Left Right N/O/S 3Q0959354

€23.95

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Part no. 5M5T-14B192-EA-1

Ford Transit Custom Relay 4-Pin Black 12V 40A FOMOCO Set X2 5M5T-14B192-EA

€23.95

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Part no. 9365054

BMW F30 Wiring Harness Loom Rear Trunk Lid Boot Tailgate 9365054

€32.95

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Part no. 191906383C

Audi VW Volkswagen Seat Relay Unit Module 4 Pins 191906383C

€23.95

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Part no. MB3T-14N143-MC

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

€32.95

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Part no. 0AM911023F

Volkswagen Polo 6R Engine Starter Motor Assembly Unit 0AM911023F

€23.95

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Showing 5446-5544 of 14021 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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