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. 3G0845109

Volkswagen Tiguan Skoda Octavia 5E Sun Light Solar Sensor Control Unit 3G0845109

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Volkswagen VW Crafter SY Fuel Pump Module Control Unit ECU 2.0 TDI 3Q0906121C

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Audi A6 C8 Alternator Earth Line Ground Wiring Harness Cable 4K0971238

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Porsche Cayenne 9PA Gateway Control Module Unit 3.2 V6 7L5907530A

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BMW F20 F21 LCI F36 F87 M2 N55 Cable Alternator Starter Base B Wiring 8621486

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Audi S3 8V Battery Tray Holder Mounting Bracket 5Q0915331K

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Mercedes SLK R172 Roadster Soft Top Folding Roof Control Module A1729003406

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Audi A8L 4H Navigation Dashboard Display Hud Screen 4H0919604H

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BMW 5 6 Series E60 E61 E63 LCI Cable Set Start / Stop Switch Wiring Loom 6970087

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Mercedes W164 Positive Battery Cable Wiring A1645403130

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Honda Stream S Alternator Generator 31100-PSA-013

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

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Mercedes-Benz E-Class W207 Cabrio A207 Battery Ground Cable Wiring Mass Lead

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Volkswagen Passat B5 Audi A8 D3 A4 B6 Fuse Box Control Unit Module 8D1941824

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Audi Q2 GA 35 TFSI 1.5 DXDB Engine ECU Kit Ignition + Key 05E907309CB Manual

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Audi A6 C8 Negative Minus Earth Cable Battery Wiring Harness 4K0915181

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BMW F30 F80 M3 Battery Cover Trunk Trim Panel Right Boot 7239175

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Volkswagen Crafter SY Anti Theft Alarm Sensor Module Control Unit 5Q0951172A

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Fuel Pump Module Mercedes W176 W204 C207 W212 W246 Control Unit ECU A0009001704

€80.95

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

€23.95

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Range Rover Evoque L538 Electric Handbrake Control Unit Module EJ32-2C491-AB

€23.95

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Land Rover Discovery 4 L319 Centre Console iPod Connection Wiring AH22-14D202-BB

€23.95

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Mercedes SLK R171 Rain Sensor Front Windscreen Light A1718204026

€37.95

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ICM Control Unit BMW F01 F02 LCI F06 F10 F11 F13 ECU Module 6875997

€32.95

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BMW F02 F06 F07 F10 F11 F12 F13 VDC Rear Suspension Level Control Module 6859722

€42.95

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BMW E65 E66 Power Distribution Box 6900583

€23.95

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Mercedes W221 Antenna Amplifier Aerial A2218204189

€23.95

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Seat Leon Mk3 Antenna Amplifier Module FM Right O/S Aerial Booster 5F4035225B

€42.95

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Ford Transit Custom Mk8 Battery Box Lid Tray Cover Panel Trim LK4T-10N725-BA

€37.95

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Seat Skoda Audi VW Polo 6R Multi Use Control Relay 4 Pin 645 4H0951253A SET X3

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Door Wiring Mercedes W177 W247 Front Passenger Side Cable Harness A1775408609

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Mercedes W907 W910 Battery Electrical Wiring Harness Ground Line A9075407160

€28.95

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Ford Focus Mk3 Rear Tail Light Lamp Wiring Cable Left N/S BM51-13405-AK

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Part no. DV6T14B533BD

Ford Transit Connect Door Module Front Left N/S Control Unit ECU DV6T14B533BD

€32.95

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

€23.95

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BMW E46 E83 E85 Engine Electronics Unit Box Cover Trim 7521582

€23.95

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Sound Amplifier BMW X5 F15 X6 F16 Active Harman Becker Design 9390835

€37.95

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BMW X5 E53 3.0i Petrol Pressure Hose Compressor Condenser 8377077

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Audi A5 8T Seat Cable Front Wiring Loom Harness Left Right N/O/S 8T0971365J

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

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Mercedes-Benz C W204 Front Left Door N/S Control Unit Module A2048207385

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SAM Module Mercedes W207 A207 C207 Rear Control Unit ECU A2129060205

€99.95

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Earth Ground Cable Mercedes W204 W207 Battery Wiring Loom Engine A2044402607

€23.95

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Audi A3 8P Multi Use Control Module Relay 4 Pin Light Green Unit Set 4H0951253

€23.95

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Seat Ibiza Mk5 KJ1 Multimedia Radio CD Player Head Unit 575035816A

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Mercedes Sprinter W910 Fuel Tank Wiring Loom Cable Harness A9105400805

€23.95

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Audi A3 8V Rear Door Wiring Cable Harness Loom Left Right N/O/S 8V5971687E

€23.95

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Audi S8 D3 Front Headlight Level Control Sensor Right O/S 4E0941286G

€32.95

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Mercedes Vito W447 Earth Ground Cable Negative Battery Lead Wiring A4475407604

€23.95

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Mercedes GLC C253 Tailgate Boot Lid Module Control Unit A2059004507

€51.95

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Land Rover Discovery L550 Sunroof Sliding Roof Drive Motor Actuator WR09-C01-AA

€23.95

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Part no. 6H22-14C708-AC

Land Rover Discovery 3 L319 Front Electric Seat Control Module 6H22-14C708-AC

€66.95

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BMW F30 LCI 330e Hybrid High Voltage Electronics Unit Holder Support 9382401

€37.95

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Module Mercedes W205 Air Conditioning A/C System Control Module A2059007521

€23.95

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Mercedes W907 314 CDI Engine Alternator Generator Valeo A6519065700

€161.95

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Ground Line BMW G11 G12 G20 G30 G31 Battery Earth Cable Wire 8633997

€23.95

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Mercedes W221 Front Centre Dashboard Speaker Logic 7 A2218207502

€32.95

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BMW F01 Front Door Wiring Loom Cable Harness 9262871

€32.95

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Mercedes W164 Boot Trunk Lid Tailgate Control Unit Module ECU A1648702726

€51.95

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BMW X5 F15 Fuse Box Rear Relay Module Control Unit 9316569

€23.95

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Mercedes W204 R172 DAB Receiver Digital Audio Control Unit Module A1669003602

€89.95

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Ford Fiesta Mk7 GPS Sensor Antenna Module C1BT-19C175-AB

€42.95

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BMW E90 LCI M-Audio Controller System Control Unit Module Navigation 9186215

€28.95

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Ford B-Max 1.0 GTDi Ecoboost Fuel Injector Wiring Harness CM5G-9F666-BC

€23.95

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Ford B-Max Roof Antenna Wiring Harness Cable AV1T-18812-EB

€23.95

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Audi Q5 FY Multimedia Volume Control Button Switch Knob Head Unit 80C919616

€23.95

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Range Rover Evoque L538 Radio CD Player Sat Nav Head Unit CF6N-18C815-HB

€89.95

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BMW X3 SERIES E83 Wiring Loom Harness Passenger Side 3508099

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Mercedes W164 W251 High Tone Horn Signal Right O/S A0065424220

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BMW X3 Series E83 E83N Inclination Indicator Alarm System 65753405815 3405815

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FEM Module BMW F23 F36 Body Control Unit ECU LR01 9387266

€132.95

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Audi Q7 4M Front Door Module Control Unit ECU Passenger Side 4M0959592N

€56.95

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BMW F40 Ultrasonic Alarm System Module Control Unit 5A44586

€66.95

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Mercedes A-Class W168 Door Cable Harness Wiring Loom Front Right A1685405008

€23.95

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Skoda Octavia II BKD 2.0 TDI Starter Motor 02E911023L

€42.95

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Audi A4 B9 Dashboard Air Vent Wiring Loom Harnes Cable Passenger Side 8W0971659B

€23.95

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

€23.95

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Battery Cover BMW X1 F48 X2 F39 Mini Countryman F60 Upper Panel 7290727

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Porsche Boxster S 986 3.2 9621 251HP Engine Control ECU Kit 99661860500 Manual

€503.95

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BMW E90 E91 E92 335i Petrol N54 ECU Kit Control Unit DME 7568842 CAS3 Key Manual

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Volkswagen Crafter Mk2 Wing Mirror Aerial Antenna Wiring Module 7C0035532

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Volkswagen Polo 6R Tiguan 1T Multi Use Control Module Relay SET 4H0951253C

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BMW F20 F21 F30 F31 F32 Mini F56 F57 Seat Control Unit Module Heating 9381114

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Audi A3 8P Volkswagen Caddy MK3 Earth Ground Cable Battery Wiring 1K0971250AN

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Ford Fiesta Mk7 Rear PDC Parking Sensor Wiring Harness Loom C1BT-15K868-AAE

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

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Volkswagen Touareg 7L Air Module Control Unit Crash Impact Sensor 7L0959655

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BMW 3 X3 Z4 Series 2 E46 E83 E85 Engine Electronics Unit Box 7534922

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Wiring Cable BMW F06 F12 F13 Electric Parking Hand Brake Handbrake Set 9277202

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Volkswagen Golf Mk6 Alternator Main Cable Wiring Harness Loom 1K0971349BP

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Mercedes W221 Dashboard Instrument Cluster Panel Switch A2218202910

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Audi TT FV Driver's Seat Cable Seat Belt Warning Wiring Loom Harness 8S0971365F

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Audi A1 8X Q3 8U Front Door Module Driver's Side Control Unit ECU 8X0959793E

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Audi A5 F5 Seat Module Control Unit ECU Front Left Right N/O/S 4M0959760A

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Audi A6 C7 Front Door Wiring Harness Loom Left N/S Passenger's Side 4G5971030DJ

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Ford Mondeo Mk4 Central Door Locking Control Unit Module ECU 7S7T-19G481-DB

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Showing 5545-5643 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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