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.

More information

Make

Category

Subcategory

Condition

In Stock

Price

Products in promotion

Part no. 191955531

Audi Volkswagen Seat Relay Unit Module 6 Pins 12V 191955531

Product currently unavailable

Part no. 5H0919605B-1

Volkswagen GOLF CD1 Multimedia Display Screen Radio Sat Nav Head Unit 5H0919605B

Product currently unavailable

Part no. rhd-6R2971121GS

Volkswagen Polo 6R 3D Front Left N/S Door Wiring Harness Cable Loom 6R2971121GS

Product currently unavailable

Part no. 02Z911024H

Volkswagen Passat B7 Starter Motor Actuator TDI Diesel Engine 02Z911024H

Product currently unavailable

Part no. 7H4971793

Volkswagen Transporter T5 Cable Battery Terminal Minus 7H4971793

Product currently unavailable

Part no. 03G906018FC-2

Volkswagen Golf V 5 1K 2.0 TDI BMN 170HP Engine Control ECU 03G906018FC Manual

Product currently unavailable

Part no. 5N0907801B

VW Volkswagen Tiguan 5N Parking Brake Handbrake Module Control Unit 5N0907801B

Product currently unavailable

Part no. 038971803

Volkswagen VW Caddy 2K Injector Wiring Harness Loom 038971803

Product currently unavailable

Part no. 3C8035730

VW Volkswagen Tiguan 5N Bluetooth Interface Control Module ECU 3C8035730

Product currently unavailable

Part no. 5Q0915321H

VW Volkswagen Golf Mk7 Battery Tray Holder Mounting Bracket Support 5Q0915321H

Product currently unavailable

Part no. RHD-6R2971120GE

VW Volkswagen Polo 6R Driver's Side Door Wiring Harness Loom 6R2971120GD

Product currently unavailable

Part no. 03L906023PC

Volkswagen Caddy 1.6 TDI CAYD C20 102HP Engine Unit ECU Manual 03L906023PC

Product currently unavailable

Part no. 3G5035820B

VW Volkswagen Tiguan Mk2 AX1 Multimedia Radio Navigation Head Unit 3G5035820B

Product currently unavailable

Part no. 2K5937085

VW Volkswagen Caddy C20 Body Control Module BCM Comfort Control Unit 2K5937085

Product currently unavailable

Part no. A9069007000

VW Volkswagen Crafter Radio Stereo Sat Nav Display Screen Head Unit A9069007000

Product currently unavailable

Part no. 6R0971349AL

VW Polo 6R Battery Cable Positive Alternator Starter Wiring B+ 6R0971349AL

Product currently unavailable

Part no. 3AA959433E

VW Volkswagen Passat B7 Convenience Body Control Module Unit ECU 3AA959433E

Product currently unavailable

Part no. 5WA035284B

VW Volkswagen Tiguan Mk2 Online Connect Bluetooth Control Unit 5WA035284B

Product currently unavailable

Part no. 1K0035186AD

VW Volkswagen Golf 5 Radio CD Player Stereo Head Unit 1K0035186AD

Product currently unavailable

Part no. 7N0907530C

VW Volkswagen Golf 6 Gateway Control Unit Module ECU 7N0907530C

Product currently unavailable

Part no. 070911023B

Volkswagen Touareg 7L 2.5 TDI Engine Starter Motor Actuator Starter 070911023B

Product currently unavailable

Part no. 5WA035741B

Volkswagen Golf CD1 Antenna Amplifier Transmitter Receiver Module ECU 5WA035741B

Product currently unavailable

Part no. 5G0971095E

VW Volkswagen Golf Mk7 Wiring Loom PDC Front Harness Parking Sensor 5G0971095E

Product currently unavailable

Part no. 5N0971693A

Volkswagen TIGUAN 5N Rear Door Left Right N/O/S Harness Cable Wiring 5N0971693A

Product currently unavailable

Part no. 03L906012Q

VW Volkswagen Crafter 1 2.0 TDI CKTB Engine Unit Module ECU Manual 03L906012Q

Product currently unavailable

Part no. 5N0971120G

VW Tiguan 5N Door Wiring Cable Harness Loom Front Driver's Side 5N0971120G

Product currently unavailable

Part no. 5H0971104P

Volkswagen Golf Mk8 CD1 Parking Sensor Wiring Rear Bumper Loom Cable 5H0971104P

Product currently unavailable

Part no. 03L906023A

VW Volkswagen Golf 6 1.6 TDI Diesel CAYB Engine Unit ECU Manual 03L906023A

Product currently unavailable

Part no. 02Z911023E

Volkswagen New Beetle 1.4 TSI Petrol Engine Starter Motor 02Z911023E

Product currently unavailable

Part no. 5N1971121G

Volkswagen Tiguan 5N Door Wiring Front Passenger Side Cable Harness 5N1971121G

Product currently unavailable

Part no. 5H9971693AH

VW Volkswagen Golf Mk8 Door Cable Rear Left N/S Harness Wiring Loom 5H9971693AH

Product currently unavailable

Part no. RHD-5G4971121MT

Volkswagen Golf Mk7 VII Front Right O/S Door Loom Wiring Harness 5G4971121MT

Product currently unavailable

Part no. 03C907309A

Volkswagen Golf Mk6 1.4 TSI CAXA 122HP Engine Control ECU 03C907309A Manual

Product currently unavailable

Part no. 03G906021PM

Volkswagen Golf 5 1.9 TDI 105HP BXE Engine Control Unit ECU Manual 03G906021PM

Product currently unavailable

Part no. 03E906019M

Volkswagen Polo 6R 1.2 Petrol CGPB 60HP Engine Control ECU Manual 03E906019M

Product currently unavailable

Part no. 7E0919475

Volkswagen Transporter T5 Parking Aid Control Module Unit 7E0919475

Product currently unavailable

Part no. 7N0907530S

VW Volkswagen Sharan 7N Gateway Control Unit Module ECU 7N0907530S

Product currently unavailable

Part no. 02Z911023P

Volkswagen Transporter T5 Diesel Engine Starter Motor 2.0 TDI 02Z911023P

Product currently unavailable

Part no. 5K0937084B

Volkswagen Scirocco Mk3 Fuse Box Module Comfort BCM Control Unit ECU 5K0937084B

Product currently unavailable

Part no. 1T0971558D

Volkswagen Touran 1T Door Wiring Front Right O/S Harness Loom Cable 1T0971558D

Product currently unavailable

Part no. 074906032AT-1

Volkswagen Crafter 1 2.5 TDI 109HP BJK Engine Unit ECU Kit 074906032AT Key Lock

Product currently unavailable

Part no. 03G906021KF

VW Touran 1T 2.0 TDI BKD 140HP Engine Module ECU Kit 03G906021KF Manual

Product currently unavailable

Part no. 3C8035195H

Volkswagen New Beetle 70s Tiguan Mk1 Radio Stereo Head Unit 3C8035195H

Product currently unavailable

Part no. 03L907309K

VW Transporter T5 2.0 TDI CAAA Engine Unit Module ECU Manual 03L907309K

Product currently unavailable

Part no. 05E907309G

VW Golf VIII CD1 1.5 eTSI DFYA 150HP Engine Control Unit Module ECU 05E907309G

Product currently unavailable

Part no. 1K0919283A

Volkswagen Touran 1T Parking Control Unit Module Sensor 1K0919283A

Product currently unavailable

Part no. 5WA959655L

Volkswagen VW Golf Mk8 Air Module Control Unit ECU Module 5WA959655L

Product currently unavailable

Part no. 6H0953254

VW Volkswagen Polo 6N Key Reader Ignition Lock Cable Wiring Harness 6H0953254

Product currently unavailable

Part no. 7E0959263

Heater Resistor VW Transporter T5 Heater Blower Motor Fan Resistor 7E0959263

Product currently unavailable

Part no. 5G0035874

Volkswagen VW Golf Mk7 Infotainment Radio Multimedia Head Unit 5G0035874

Product currently unavailable

Part no. 7P6035730K

VW Volkswagen New Beetle Mk3 Bluetooth Interface Control Module ECU 7P6035730K

Product currently unavailable

Part no. 012911023F

Volkswagen Touareg 7L Starter Motor Engine Diesel Bosch 012911023F

Product currently unavailable

Part no. 1K0953549CH

VW Tiguan 5N Angle Steering Wheel Column Sensor Control Module 1K0953549CH

Product currently unavailable

Part no. 03F906070HE

VW Polo 5 6R 1.2 TSI Petrol Engine CBZB 105HP ECU Engine Control Unit Manual

Product currently unavailable

Part no. 06F903023HX

Volkswagen Golf Mk5 2.0 TFSI Petrol Alternator Generator 06F903023HX

Product currently unavailable

Part no. 7N0951253

VW Volkswagen Scirocco Mk3 Power Starter Motor Relay 12V 50A Plug 7N0951253

Product currently unavailable

Part no. 3Q0035842B

Volkswagen Polo V Golf VI Radio CD Stereo Radio Head Unit 3Q0035842B

Product currently unavailable

Part no. 5K0971095D

Volkswagen Golf 6 Front Bumper Electrical Wiring Harness PDC Sensor 5K0971095D

Product currently unavailable

Part no. RHD-5G2971147CH

Volkswagen Golf Mk7 VII Tailgate Boot Trunk Cable Wiring Loom 5G2971147CH

Product currently unavailable

Part no. 038906016AJ

VW Volkswagen Transporter T5 1.9 TDI Diesel Engine Control Unit ECU 038906016AJ

Product currently unavailable

Part no. 06K907425B-11

VW Golf Mk7 5G R 2.0 TFSI CJXC 300HP 4motion Engine ECU Kit 06K907425B + 2 Keys

Product currently unavailable

Part no. 1T0971085

Volkswagen VW Touran 1T Parking Sensor Wiring Rear Bumper Loom Cable 1T0971085

Product currently unavailable

Part no. 1K0035156B

VW Volkswagen Golf 6 Radio Head Unit RNS 210 Player Unit 1K0035156B

Product currently unavailable

Part no. 5M0035186AA

Radio CD Player VW Volkswagen Golf Polo Passat B6 Head Unit RCD310 5M0035186AA

Product currently unavailable

Part no. 3C0937125A

Volkswagen Tiguan 5N Engine Bay Fuse Relay Box Terminal 3C0937125A

Product currently unavailable

Part no. 5Q0971845

Volkswagen VW Golf Mk8 OBD Diagnostic Socket Loom Cable Plug Wiring 5Q0971845

Product currently unavailable

Part no. 02M911024C

Volkswagen Tiguan 5N Engine Starter Motor 02M911024C

Product currently unavailable

Part no. 1K0907530F

Volkswagen Touran 1T Central Gateway Module Control Unit Lear 1K0907530F

Product currently unavailable

Part no. 5K0907115

Volkswagen Golf 1K GTI 2.0 TFSI CCZB 211HP Engine Control ECU 5K0907115 Manual

Product currently unavailable

Part no. 5WA915181D

Volkswagen Golf CD1 Negative Battery Terminal Cable Wiring Battery 5WA915181D

Product currently unavailable

Part no. 04B907445-1

Volkswagen Polo 6C 1.4 TDI CR 75HP CUSA Engine Control Unit ECU 04B907445 Manual

Product currently unavailable

Part no. 1J0907655A

Volkswagen New Beetle Yaw ESP Rate Sensor Module Unit Control ECU 1J0907655A

Product currently unavailable

Part no. 045906013S

VW Polo 9N BMS 1.4 TDI Diesel Blue Motion Engine Control ECU Manual 045906013S

Product currently unavailable

Part no. 1K8971104D

Volkswagen Scirocco Rear Number Plate Wiring Harness Cable Loom 1K8971104D

Product currently unavailable

Part no. 1K0035186AQ

Radio Head Unit VW Volkswagen Golf 6 Passat B7 Media Player Unit 1K0035186AQ

Product currently unavailable

Part no. 6R0971065

Volkswagen Polo 6R Parking Sensor Wiring Rear Bumper PDC Loom Cable 6R0971065

Product currently unavailable

Part no. 1K0915443A

VW Volkswagen Golf Mk5 Battery Lid Fuse Box Tray Housing Cover Trim 1K0915443A

Product currently unavailable

Part no. 443937105

VW Volkswagen Audi Skoda Seat Little Relay Fuse Amp 20A 12V Module 443937105

Product currently unavailable

Part no. 5H2971147

Volkswagen Golf CD1 Wiring Harness Rear Boot Trunk Lid Tailgate Loom 5H2971147

Product currently unavailable

Part no. 6C0937089

Volkswagen Polo 5 6R 1.2 TSI CJZC Central Body Comfort BCM Module 6C0937089

Product currently unavailable

Part no. 3D0909139

Volkswagen Touareg 7L Keyless Entry Module Control Unit ECU 3D0909139

Product currently unavailable

Part no. 5C0959655B

Volkswagen Golf Mk6 VI Air Module Control Unit ECU 5C0959655B

Product currently unavailable

Part no. 7N0843639

Volkswagen Sharan 7N Sliding Door Locking Catch Plate Left N/S 7N0843639

Product currently unavailable

Part no. 06K907425B-13

Volkswagen Golf VII R 2.0TSI CJXC 300HP Engine Control ECU Kit 06K907425B Manual

Product currently unavailable

Part no. 1T0907539C

Volkswagen Touran 1T Dashboard Solar Sun Sensor 1T0907539C

Product currently unavailable

Part no. 3D0941329B

Volkswagen Passat B7 Headlight Cornering Module Control Unit 3D0941329B

Product currently unavailable

Part no. 6Q0035152E

Radio CD Player VW Volkswagen Polo 9N Head Unit Audio Player 6Q0035152E

Product currently unavailable

Part no. 5K0035730D

VW Volkswagen Golf 6 Bluetooth Interface Control Module Unit ECU 5K0035730D

Product currently unavailable

Part no. 6R0971537F

VW Volkswagen Polo 6R Negative Battery Terminal Cable Wiring 6R0971537F

Product currently unavailable

Part no. 03L906023ML

VW Volkswagen Golf Mk6 1.6 TDI 105 HP Diesel CAYC Engine ECU 03L906023ML Manual

Product currently unavailable

Part no. 03L906012Q-1

VW Volkswagen Crafter 35 2.0 TDI CKTB Engine Unit ECU Kit Key Lock 03L906012Q

Product currently unavailable

Part no. 7H0937086D

VW Volkswagen Transporter T5 Body Control Module BCM Control Unit 7H0937086D

Product currently unavailable

Part no. 5WA959655AD

Volkswagen Golf Mk8 Air Module ECU Sensor Control Unit 5WA959655AD

Product currently unavailable

Part no. 5NN919605B

VW Polo Mk6 Display Screen Radio Multimedia Navigation Sat Unit 5NN919605B

Product currently unavailable

Part no. 1K0907115T

Volkswagen Golf Mk5 1K GTI 2.0 TSI BYD 230HP Engine Unit ECU 1K0907115T Manual

Product currently unavailable

Part no. 03E906019AK

VW Volkswagen Polo 6R CGPB 1.2 Petrol 60HP Engine Control Unit ECU 03E906019AK

Product currently unavailable

Part no. 6R0906507G

Engine Unit Bracket VW Polo 6R ECU Module Holder Bracket Mount 6R0906507G

Product currently unavailable

Part no. 1C0959799F

Volkswagen New Beetle Golf Mk4 Seat Leon Mk1 Comfort Control Module 1C0959799F

Product currently unavailable

Part no. 1T0971121L

Volkswagen Touran 1T Front Door Right O/S Electrical Wiring Harness 1T0971121L

Product currently unavailable

...

Showing 397-495 of 800 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 .

used parts volkswagen car parts mercedes used car parts cheap car parts audi auto parts spare parts genuine used audi parts bmw starters, alternators, ecus & wiring mercedes starters, alternators, ecus & wiring mini starters, alternators, ecus & wiring audi starters, alternators, ecus & wiring volkswagen starters, alternators, ecus & wiring