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. 8XA971085C

Audi A1 S1 8X Rear Bumper PDC Parking Sensor Wiring Harness Loom 8XA971085C

€37.95

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Part no. 7P6919475D

VW Volkswagen Touareg 7P PDC Parking Distance Control Module Unit 7P6919475D

€28.95

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Part no. A9064460542

Mercedes W639 W906 ECU Control Unit Sensor Module Air Module A9064460542

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Door Cable BMW F36 Rear Left Right N/O/S Wiring Harness 9325917

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BMW F20 F21 F22 F30 F31 F32 F36 Body Control Module Unit FEM LR01 9438731

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Audi Q7 4M Body Control Comfort Unit Module BCM Convenience Unit ECU 4N0907063KE

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BMW E90 E91 LCI E92 330d Diesel N57 Engine Control Unit DDE 8510221 Automatic

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Mini Countryman F60 Battery Ground Earth Mass Cable 8651049

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Mini EGS Control Unit Module ECU Programmed 5 Pins 1421295

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Mercedes W204 ECU Control Unit Sensor Module Airbag A2048706826

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Door Module Mercedes W205 X253 Front Door Right O/S Control Unit A2229000013

€23.95

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Kia Ceed I 1.6 CRDI 115HP D4FB Diesel Engine Control ECU 39113-2A511 Manual

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BMW E81 E87 LCI E90 E91 120d 320d N47 177HP ECU KIT DDE 8506438 CAS 3 Key

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Mercedes-Benz E CLS Class W211 W219 Crash Sensor Left Right N/O/S A0018209326

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

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BMW E60 E81 E87 E90 E91 X3 E83 Relay Changer Make Contact Salmon Red Set 1742690

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Mercedes CLC-Class CL203 Rear Parking Sensor Wiring Loom Cable PDC A2034404532

€23.95

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Mini R55 R56 Gearbox Clutch Cylinder Control Cylinder Unit 6770600

€32.95

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Part no. 8K0971104

Audi A5 8T Rear Bumper PDC Parking Sensor Wiring Harness Loom 8K0971104

€23.95

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BMW 1 2 Series F20 F21 F30 F30 Mini F56 Front Seat Sensor Mat Left N/S 9284594

€23.95

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Part no. A6519007500-7

Mercedes A207 C207 E220 CDI 651.911 BE Engine ECU Kit Ignition + Key A6519007500

€142.95

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Part no. 9196937

BMW E93 Convertible Seat Control Unit Module ECU 9196937 FSV 7.14.0

€23.95

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Part no. 80A906093

Audi Q5 FY Fuel Pump Control Unit Module ECU Diesel Kuhnke 80A906093

€32.95

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Part no. 8U0971035AL

Audi Q3 8U Door Loom Wiring Harness Cable Front Right O/S 8U0971035AL

€23.95

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Part no. 4F0051510K

Audi Cable Adapter iPod Connection 4F0051510K

€23.95

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Part no. 03G906018DN-3

Audi A3 8P 2.0 TDI 170HP BMN Engine Control Module ECU Kit 03G906018DN Manual

€170.95

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Part no. DH22-14B192-EA

Land Rover Discovery Sport L550 Relay 4-Pin Unit 12V 70A Grey DH22-14B192-EA

€23.95

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BMW F10 F11 F12 F13 F15 F16 Airbag Sensor Module B-pillar Crash Sensor 9224177

€23.95

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Fuel Pump Control Audi A3 8P VW Golf Mk6 Relay Module Unit ECU 12V 1K0906093F

€23.95

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Mercedes W213 OM654 Engine Wiring Cable Cover Duct Bracket Channel A6541592225

€23.95

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Mercedes W166 Door Module Rear Left N/S Control Unit ECU A1669005412

€28.95

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Ford Transit Mk8 Fiesta Mk8 Crash Impact Sensor Air Module L1TT-14B006-AA

€23.95

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Part no. A2139000124

Mercedes W213 W222 C257 Amplifier Module Audio Burmester A2139000124

€427.95

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Mercedes W177 Crash Impact Sensor Front Door Left Right Unit A1679050700

€23.95

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Seat Control Unit BMW X5 E70 E87 E90 Module ECU Electronic Module 9149836

€47.95

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Yaw Sensor Audi A4 B8 A5 8T ESP Rotation Rate Unit Module 8K0907637C

€23.95

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BMW E87 E90 Navigation System Professional CCC Navi Controller 6987692

€569.95

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BMW 3 5 6 Series E60 E63 E90 E92 Crossover Frequency Unit Module Door 7838929

€23.95

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BMW X3 F25 Central Gateway Module Control Unit ECU 9282285

€47.95

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Volkswagen Skoda Seat Audi Radiator Cooling Fan Relay Control Unit 1J0919506M

€23.95

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BMW F20 F21 F30 F31 N47N 116d 316d ECU Control Unit Module DDE 8518569 Manual

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Audi A3 8L A4 B5 A6 C5 Alarm Control Module Unit ECU 4B0951173

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BMW 1 Series F20 Control Unit Air Conditioning A/C Module 9287530

€23.95

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Mini Cooper R55 R56 Control Unit Module Passive Go 3448466

€28.95

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BMW E65 E66 E67 Earth Ground Battery Strap Cable 7518610

€23.95

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Part no. 4L0910441C

Audi Q7 4L Rear Reversing Camera Module View Control Unit ECU 4L0910441C

€94.95

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Seat Arona KJ7 Door Wiring Harness Loom Cable Rear Right O/S 6F0971161T

€32.95

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Part no. 7P1907401

Volkswagen Touareg 7L 3.0 TDI CVVA 262HP Engine Control ECU 7P1907401 Automatic

€237.95

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Part no. 4H0907182G

Audi A8 D4 4H Multicontour Seat Module Control Unit Left Right N/O/S 4H0907182G

€42.95

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Part no. A1725400433

Electric Wire Mercedes SLK R172 M271 Alternator Prefuse Box Wiring A1725400433

€28.95

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Part no. A2229001408

Module Mercedes S205 Trunk Rear Tuner Digital Radio DAB Control Unit A2229001408

€32.95

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Part no. 4G8959107S

Audi A7 4G8 Sportback Electric Tailgate Bootlid Control Unit Module 4G8959107S

€23.95

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Part no. 5C0035680C

Volkswagen Scirocco Tiguan 5N Display Screen Multimedia Nav Unit 5C0035680C

€560.95

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Part no. 2188246

Ford Transit Custom Rear Bumper PDC Cables Wiring Loom Harness JK2T-15K868-AB

€70.95

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Part no. 6868253

BMW F20 F21 F30 F31 ECU ICM Control Unit Module Airbag ECU 6868253

€23.95

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Part no. 4G8959795J

Audi A7 4G8 Rear Door Module Control Module Unit Left Right N/O/S 4G8959795J

€23.95

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Part no. K1BT-18B955-FD-1

Ford Transit Custom Mk8 Dashboard Display Screen Touchscreen K1BT-18B955-FD

€123.95

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Seat Wiring Mercedes C117 Front Seat Left Wiring Harness a2465400512

€28.95

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Part no. 8506444

BMW E90 E91 LCI E92 330d N57 245HP ECU Engine Control Unit DDE 8506444 Manual

€113.95

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Part no. 8V21-11000-AE

Ford Transit Connect Mk2 Diesel Starter Motor 8V21-11000-AE

€23.95

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Vauxhall Opel Insignia A 2.0 TDCI Engine Control Module 55585024 Manual

€28.95

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BMW F30 LCI 335dX N57Z Engine Gearbox Module Wiring Cable Loom Harness 8578504

€37.95

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Part no. A2465411005

Battery Cover Mercedes C117 W176 W246 Box Trim Lid Panel Housing A2465411005

€23.95

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Part no. A2319009106

Door Module Mercedes R231 Front Door Right O/S Control Module A2319009106

€47.95

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Part no. 9270495-CAR1

BMW X5 E70 X6 E71 F10 F11 PDC Ultrasonic Sensor Carbonschwarz 416 9231281 SET X2

€23.95

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Part no. 7L0937503

Volkswagen Touareg 7L Fuse Box Relay Control Unit Module 7L0937503

€56.95

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Part no. 7624412

BMW 1 3 Series F20 F21 F30 Cable Alternator Starter Base B Wire 7624412

€23.95

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VW Sharan 7N Rear Door Module Control Unit Left N/S Passenger Side 7N0959794K

€23.95

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

€23.95

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Mercedes W212 Door Wire Wiring Loom Front Right O/S A2125406505

€37.95

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Ford Focus Mondeo Escort 1.8 Petrol Engine Motor Starter XS7U11000C4A

€28.95

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Part no. 6864923

Air Module BMW F01 F02 LCI F07 GT F10 F11 F13 ECU Control Unit 6864923

€23.95

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Part no. 8W0906093D

Audi A4 B9 Fuel Pump Control Unit Module ECU 8W0906093D

€28.95

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Part no. 7L5035225T

Porsche Cayenne 9PA Aerial Antenna Amplifier Unit Rear Right O/S 7L5035225T

€47.95

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Part no. 7M0951253C-2

VW Touareg 7L Audi Q7 4L Relay Black Control Unit 5 Pin 404 12V Set 7M0951253C

€23.95

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Part no. 6900583

BMW E65 E66 Power Distribution Box 6900583

€23.95

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Part no. 6868598

BMW 1 2 3 F20 F21 F22 F30 F31 ECU ICM Control Unit Module 6868598

€23.95

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Part no. 06A906033GQ-1

Audi A3 8P 1.6 MPI BSE 102HP Engine Control Unit ECU 06A906033GQ Manual

€66.95

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Part no. 4H0937555

Audi A8L 4H Fuse Box Relay Chamber Lower Cover Lid Housing 4H0937555

€23.95

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Part no. F1B1-12A650-AMB

Ford Fiesta Mk7 1.0 EcoBoost 100HP Engine Control Unit ECU F1B1-12A650-AMB

€75.95

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Part no. A0009006907

Mercedes W205 Tire Pressure Control Module A0009006907

€23.95

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Part no. 8509757-1

BMW F07 530d F01 730d N57 245HP Engine ECU Kit DDE 8509757 CAS4 Key Automatic

€237.95

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Part no. 9247130

BMW F11 Touring Antenna Aerial Diversity Amplifier Unit 868 MHZ 9247130

€32.95

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Part no. 7243564

BMW F20 F30 Front Sport Seat Backrest Heating Mat Element 7243564

€51.95

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Part no. BV6T-14B526-BB

Ford Focus Mk3 Voltage Stabilisation Control Module Bosch ECU BV6T-14B526-BB

€23.95

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Part no. 6964263

BMW 3 Series E93 E93N Cabrio Module Bracket Holder CTM 6964263

€23.95

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Part no. 4L0910441B

Audi Q7 4L Rear Reversing Camera View Module Control Unit ECU 4L0910441B

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BMW F20 X3 F25 Head Unit Navigation GPS Sat Nav Infotainment DAB High 9286465

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Part no. A6549061400

Starter Motor Mercedes W213 S213 W238 OM654 Diesel Engine Actuator A6549061400

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BMW 1 3 Series F20 F30 LCI M140i 340i Engine Gearbox Module Wiring Loom Harness

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Part no. 443937105A

VW Volkswagen Audi Skoda Seat Little Fuse Amp 30A 12V 443937105A

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Part no. A2535409530

Mercedes X253 Hybrid Engine Wiring Harness Loom Cable A2535409530

€56.95

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Part no. A1669061202

Mercedes W221 Fuse Box Control Unit Module Relay A1669061202

€32.95

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Part no. 9243667

BMW X3 F25 X4 F26 Rear Door Left Right N/O/S Wiring Loom Cables Harness 9243667

€23.95

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Part no. A2218707526

Mercedes W221 Air Module Control Unit ECU SRS Module A2218707526

€28.95

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Part no. A1179001702

Mercedes GLA X156 Interior SRS Air Module Seat Belt Tensioner A1179001702

€127.95

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Part no. 8506281-3

BMW E81 E87 LCI E90 N47 115HP Diesel Engine Control Unit ECU DDE 8506281 Manual

€28.95

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Part no. 3425810

BMW X3 E83 2.5i 3.0i Petrol M54 Engine Wiring Loom Harness Module 3425810

€123.95

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Part no. 8573257-1

BMW F20 F30 F32 120d 320d 420d Diesel N47N 184HP ECU Kit DDE 8573257 Automatic

€142.95

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Showing 6139-6237 of 13895 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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