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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Products in promotion

Part no. 8H0951178

Audi A4 B7 Cabrio Alarm Signal Body Control Sensor Module Unit 8H0951178

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 191906383C

Audi VW Volkswagen Seat Relay Unit Module 4 Pins 191906383C

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 4L1937503

Audi Q7 4L Fuse Relay Box Module Electrical Control Unit 4L1937503

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8T0959792P

Audi A5 8T Front Door Control Module Right O/S Passenger Side 8T0959792Q

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8X0959793D

Audi A1 8X Driver Side Door Module Front Control Unit Module ECU 8X0959793D

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4E0035670C

Audi A6 C6 A8 D3 Navigation Radio CD SD SIM Player MMI Head Unit 4E0035670C

PLN 949.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8P4971035AC

Audi A3 8P Door Wiring Driver's Side Harness Loom Electrical Cable 8P4971035AC

PLN 474.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8X0959673

Audi A1 8X Windscreen Heating Control Switch 8X0959673

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 5Q0907530AH

Audi A3 S3 RS3 8V Gateway Control Module GW MQB Mid Unit ECU 5Q0907530AH

PLN 70.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8P0862335F

Audi A3 8P A4 B7 Bluetooth Module Interface Control Unit Hands Free 8P0862335F

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 4L0971767

Audi Q7 4L Washer Bottle Reservoir Wiring Loom Harness 4L0971767

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 4G8959795G

Audi A6 C7 Rear Door Control Module Unit ECU Left Right N/O/S 4G8959795G

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 03L906018JG

Audi A5 8F 2.0 TDI CGLC 177HP Diesel Engine Control Unit ECU 03L906018JG Manual

PLN 142.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 1J0971235S

Audi TT 8N HV Battery Negative Earth Terminal Harness Wiring Cable 1J0971235S

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 03L906018RC-1

Audi Q3 8U 2.0 TDI CFGC Quattro Engine ECU Kit 03L906018RC Ignition + Key Manual

PLN 949.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8T0959792K

Audi A5 S5 8T Door Module Control Unit Front Passenger Side 8T0959792K

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8E0035456D

Audi A4 B8 Telephone Aerial Antenna Signal Amplifier Module 8E0035456D

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 4E0035652E

Audi A6 C6 MMI Multimedia Sat Nav Navigation Control Head Unit 4E0035652E

PLN 474.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8X0971687D

Audi A1 8X Rear Door Harness Left Right N/O/S Wiring Loom Cable 8X0971687C

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 5Q0959392B

Audi A3 S3 8V Door Control Module Front Passenger Side Left N/S 5Q0959392B

PLN 75.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 03L906018LB

Audi A6 C7 2.0 TDI CGLC 177HP Engine Control Unit ECU 03L906018LA Automatic

PLN 284.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4H0907801F

Audi A6 C7 Parking Brake Handbrake Module Control Unit 4H0907801F

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 03L903023K-1

Audi A3 8P A4 A5 B8 Q5 Alternator Generator Diesel Electrical Unit 03L903023K

PLN 189.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8W0937124A

Audi A4 B9 A5 F5 Q5 FY Fuse Box Control Module Relay Box 8W0937124A

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8E0907637

Audi A4 B7 YAW Sensor ESP Rotation Rate Acceleration Control Unit 8E0907637

PLN 47.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8K0941824A

Audi A1 A4 A6 A7 A8 Fuse Box Connector Socket Module Unit 8K0941824A

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8S0963553D

Volkswagen Skoda Seat Audi Seat Pressure Sensor Front Passenger Side 8S0963553D

PLN 66.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4M0971349Q

Audi Q7 4M Electric Alternator Starter Positive Wiring Harness Cable 4M0971349Q

PLN 123.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4M0907247

Audi A4 B9 A5 F5 Keyless Entry Amplifier Control Box Module Antenna 4M0907247

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4H4907357G

Audi TT 8S Headlight Head Light Lamp Range Control Unit Module ECU 4H4907357G

PLN 260.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4H0907145

Audi A6 C7 Air Suspension Level Height Adjustment Module Control Unit 4H0907145

PLN 379.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8W6971030BF

Audi A5 F5 Front Door Wiring Harness Cable Passenger Side 8W6971030BF

PLN 284.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8U0907468Q

Audi Q3 8U Gateway Control Module Unit ECU 8U0907468Q

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8P0906131A

Audi A3 8P Engine Unit Bracket ECU Module Holder Bracket Mount 8P0906131A

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8V4971693F

Audi A3 8V Rear Left Right N/O/S Door Card Wiring Loom Harness 8V4971693

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4F1971035N

Audi A6 C6 Front Driver Side Door Wiring Harness Loom Cable 4F1971035L

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8E0035111D

Audi TT 8J Radio Head Unit Navi CD DVD Player Changer 8E0035111D

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 4H0959591A

Audi A8 D4 4H Sunroof Wind Deflector Module Control Unit 4H0959591A

PLN 123.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4M1907468D

Audi A4 B9 Gateway Control Module Unit ECU 4M1907468D

Product currently unavailable

Part no. 8W1907064BL

Audi A4 B9 Body Control Module BCM Comfort Control Unit Power Supply 8W1907064BL

PLN 759.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8V0920790A-1

Audi A3 S3 RS3 8V Instrument Cluster Speedo Clocks Petrol Automatic 8V0920790A

PLN 2,089.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 81A955555B

Rain Sensor Audi Q3 RSQ3 F3 Front Windscreen 81A955555B

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 06F903023C

Audi Volkswagen Seat Skoda Engine Alternator Generator 06F903023C

Product currently unavailable

Part no. 8N0959643A

Audi TT 8J Crash Impact Sensor Unit Air Module 8K0955557C

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8V5971687Q

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

PLN 142.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8K0915181N

Audi A1 8X Negative Battery Terminal Cable Wiring 8K0915181N

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8X0907159B

Audi A1 8X Fuel Pump Module Control Unit ECU 8X0907159B

PLN 113.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4M0907401AM

Audi Q7 4M 3.0TDI DPXB Quattro 218HP Engine Control ECU 4M0907401AM Automatic

PLN 3,229.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 5QA919294L

Audi Q2 GA Park Parking Assist PDC Distance Control Unit Module 5QA919294L

PLN 189.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8Y4971104BK

Audi S3 8Y Rear Bumper Wiring Harness Cable Loom 8Y4971104BK

PLN 284.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8R0907364B

Audi Q5 8R A5 8T A4 B8 Active Suspension Module Damping Control Unit 8R0907364B

PLN 142.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8W0907468J

Audi A4 B9 Gateway Control Unit Module ECU 8W0907468J

PLN 1,899.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4F0919805

Audi A4 B8 Smart Card Reader Smart Card System TV 4F0919805

PLN 189.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4F0971547

Audi A6 C6 Cable Wiring Loom Heater Matrix Air Conditioning Cable 4F0971547

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 4L0959655C

Audi Q7 4L Air Module Control Unit ECU Impact Sensor 4L0959655C

PLN 85.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4G8959795A

Audi A7 4G8 Door Control Module Electrical Unit ECU Rear Right O/S 4G8959795A

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 03L906018JM-1

Audi Q5 8R 2.0 TDI CGLC Quattro 177HP Engine Control ECU Kit 03L906018JM Manual

PLN 949.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8Y0963554A

Audi S3 8Y Rear Seat Couch Occupancy Recognition Sensor Unit 8Y0963554A

PLN 66.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 06A903143P

Audi TT 8N Alternator Bracket Mount Holder 06A903143P

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8T0919603E-1

Audi A4 B8 Display Screen Sat Nav Navigation Dashboard 8T0919603E

PLN 161.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8W0907159F

Audi A4 S4 B9 A5 S5 Impact Sound Actuator Control Module 8W0907159F

PLN 142.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4K0941572CS

Audi A3 8Y LED Headlight Headlamp Ballast Control Module 4K0941572CS

PLN 161.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 06N971627B

Audi A3 8Y Engine Injector Module Wiring Harness Cable 2.0 TFSI 06N971627B

PLN 189.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4L0910655B

Audi Q7 4L ECU Air Module Control Unit Crash Impact Sensor 4L0910655B

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 03L906018JG-1

Audi A5 8T 2.0 TDI CGLC 177HP Diesel Engine Control ECU Kit 03L906018JG Manual

PLN 664.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8K0959792S

Audi A4 B8 Front Door Control Module Unit ECU Passenger Side 8K0959792S

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 4M0959793H

Audi A5 F5 A4 B9 Front Door Control Module Unit ECU Driver's Side 4M0959793H

PLN 113.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 5Q0971230HH

Audi S3 8V Starter Alternator Wiring Harness 5Q0971230HH

PLN 142.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8X0959792B

Audi A1 8X Door Module Control Unit Controller Front Passenger's Side 8X0959792B

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 09G927750CA

Audi TT 8N Automatic Gearbox Module Control Unit ECU 09G927750CA

PLN 569.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4E0971142A

Audi A8 S8 D3 Door Window Lifter Wiring Cable Rear Left Right N/O/S 4E0971142A

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8K0907401-1

Audi A5 8T 3.0TDI CAPA Quattro 240HP Engine ECU Kit Ignition 8K0907401 + Key

PLN 949.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 6C0907359

Audi A4 B8 Air Suspension Module Regulation Control Unit 6C0907359

PLN 47.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8T0959793G

Audi A4 B8 Door Module Front Left N/S Control Unit ECU 8T0959793G

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8K0959793Q

Audi A4 B8 Door Module Control Unit ECU Front Driver's Side 8K0959793Q

PLN 75.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8W0035192E

Audi A4 B9 Multimedia Stereo Sat Nav SD CD Player Radio Head Unit 8W0035192E

PLN 1,139.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8T8971845

Audi A5 8T Fuse Box Relay Control Unit Module 8T8971845

PLN 75.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 03L906019AG-1

Audi A6 C6 2.0 TDI CAHA 170HP Engine ECU Kit 03L906019AG Ignition + Key Manual

PLN 854.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8Y4971104AL

Audi S3 8Y Electric Rear Bumper Wiring Harness PDC Loom Cable 8Y4971104AL

PLN 360.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8J0971226

Audi TT 8J Negative Battery Cable Lead 8J0971226

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 1K0907530G

Audi A3 8P Gateway Module Diagnostic Interface Control Unit ECU 1K0907530G

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8W0959595N

Audi A4 B9 Door Module Rear Right Left N/O/S Control Unit 8W0959595N

PLN 189.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8P4971693P

Audi A3 8P Door Wiring Harness Loom Rear Left Right N/O/S Cabling 8P4971693P

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8P3907357B

Audi S3 8P Xenon Headlight Range Control Module Unit ECU 8P3907357B

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 4L0907290

Audi Q7 4L Gateway Convenience Module Unit Control ECU 4L0907290

PLN 75.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8W1959595

Audi Q5 FY Rear Door Control Module Unit Left Right N/O/S 8W1959595

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4H0907468AF

Audi A8 D4 Central Diagnostic Getaway PKO Control Unit Module ECU 4H0907468AF

PLN 474.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 0AM911023R

Audi A3 8V 1.4 TSI Petrol Starter Motor Engine Actuator Unit 0AM911023R

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8T8035225C

Audi A5 8T Audio Radio Aerial Amplifier Control Unit 8T8035225C

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 06B903016AB

Audi A4 B7 Petrol Engine Alternator Generator Electric Unit 14V 140A 06B903016AB

PLN 142.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 5Q0959592F

Door Module Audi A3 8V Volkswagen Golf 7 Control ECU Front Left N/S 5Q0959592F

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 80A941823A

Audi Q5 FY Positive Battery Terminal Potential Distributor 80A941823A

PLN 189.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4E0941285G

Audi S8 D3 Front Headlight Level Control Sensor Left N/S 4E0941285G

PLN 208.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8F0971029AM

Audi A5 8T Front Door Electric Wiring Loom Harness Driver's Side 8F0971029AM

PLN 189.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4G0035056-1

Audi A4 B8 Sat Nav Multimedia DAB Radio Control Head Unit 4G0035056

PLN 949.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4G8971365

Audi A7 4G Seat Cable Front Left Right N/O/S Wiring Loom Harness 4G8971365

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4F5035225AJ

Audi A6 C6 Aerial Antenna Amplifier Right O/S FM Booster Unit 4F5035225AJ

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 8Y0035465

Audi A3 8Y A4 B9 Q5 FY Harman Speaker Amplifier Booster Sound System 8Y0035465

PLN 237.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8V0035874B

Audi A3 8V Multimedia Radio Sat Nav CD Player Head Unit 8V0035874B

PLN 949.95

Free delivery - Tue, Jan 13

If paid before 14:00

...

Showing 496-594 of 1552 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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