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. A1715400107

Mercedes SLK R171 Window Lifter Lift Switch Cable Wiring Harness A1715400107

€23.95

Free delivery: Mar 6 – 11

If paid before 14:00

Part no. 9289583-1

BMW X1 E84 Display Screen Dashboard Navigation Monitor On-Board CID 6,5" 9289583

€85.95

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Part no. 6866986

BMW F01 F02 LCI F06 F10 F11 F13 ECU ICM Control Unit Module Airbag 6866986

€28.95

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Part no. 4752820

Positive Cable BMW F20 F21 Under Bonnet Battery Wiring Loom 4752820

€32.95

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Part no. A2761508800

Starter Cover Mercedes W205 W212 W213 M276 Heat Plate Motor Shield A2761508800

€23.95

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Part no. A2389009000

Air Module Mercedes A205 A238 A217 SRS Protection Control Unit A2389009000

€113.95

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Part no. A2059006651

Mercedes C205 GLC C253 Body Control Comfort Module Unit SAM BCM A2059006651

€398.95

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Part no. 9266384

BMW 5 Series F10 F11 LCI Boardmonitor Central Information Display 7" 9266384

€56.95

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Part no. A0009009114

Mercedes W205 Air Conditioning Climate Control Module ECU A0009009114

€28.95

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Part no. 8573260-8

BMW F20 F21 116d ed Diesel N47N 116HP ECU Kit DDE 8573260 + Key + FEM Manual

€417.95

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Part no. 8510221-13

BMW E90 E91 LCI E92 325d Diesel N57 204HP ECU Engine Kit DDE 8510221 Automatic

€189.95

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BMW F20 F30 LCI 118i 318i B38 Gearbox Wiring Loom Harness Cable 8635815

€32.95

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BMW X5 Series E53 Battery Cable Plus Pole 1439559

€23.95

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BMW E60 E61 E63 E64 Steering Column Adjuster Switch 6947786

€23.95

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Part no. 6856314

BMW 1 3 Series F20 F21 F30 F31 ECU ICM Plus Control Unit Module Airbag

€37.95

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Part no. A0009822923

Mercedes W177 W205 W247 Relay Fuse Unit Module 4 Pins Grey A0009822923

€23.95

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Part no. A1668210351

Mercedes-Benz A CLA C117 W176 Airbag Impact Crash Sensor A1668210351

€23.95

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Part no. 2K5972175

Volkswagen Caddy 2K Rear Gate Tailgate Harness Wiring Adapter Cable 2K5972175

€23.95

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Part no. 4H0959655H

Audi A7 4G8 Air Module Control Unit ECU SRS Module Unit 4H0959655H

€23.95

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Part no. AB39-12B681-AB

Ford Ranger Mk3 Glow Plug Relay Module With Mount AB39-12B681-AB

€56.95

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Part no. A2045405609

Video Wiring Cable Mercedes W204 Video Unit Harness Cable Wire A2045405609

€23.95

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Part no. 9313992

BMW F13 Front Seat Control Module Unit ECU Left Right N/O/S 9313992

€51.95

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Part no. 9418460

BMW G30 G31 PDC Module Parking Assistant Control Unit USS VA03 HIGH 9418460

€23.95

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Part no. BJ32-19G255-BA

Range Rover L405 TV Amplifier Aerial Receiver Unit BJ32-19G255-BA

€23.95

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Part no. 9143823-1

BMW E88 E93 LCI ECU Air Control Unit Module Controller 9143823

€23.95

Free delivery: Mar 6 – 11

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Part no. 8R0907468T

Audi Q5 8R Gateway Module Control Unit ECU 8R0907468T 8R0907468C

€23.95

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Part no. 6864206

Air Module BMW F20 F21 F30 F31 F32 ECU ICM Plus Control Unit 6864206

€23.95

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Part no. A0005463704

Mercedes C118 Positive Pole Battery Insulating Cap Cover Trim A0005463704

€23.95

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Part no. F20 F30 PLUG SOCKET LOOM PDC

PDC Plug BMW F20 F22 F30 F32 Loom Socket Parking Sensor Wiring Harness

€23.95

Free delivery: Mar 6 – 11

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Part no. A2741501802

Mercedes W213 Engine Wiring Harness Cable Loom A2741501802

€180.95

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Part no. 6981416

BMW E87 E90 E91 CAS 2 Control Unit ECU Key Reading Module 6981416

€28.95

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Part no. 9241826

On Board Screen BMW F10 F11 Central Information Display Monitor 10,25" 9241826

€94.95

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Part no. 7939168

Rain Sensor BMW F20 F21 F30 F31 Windscreen Light Solar Condensation Unit 7939168

€56.95

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Part no. A0185459132

Mercedes W140 ABS Control Unit ASR + PML Module ECU A0185459132

€56.95

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Part no. 9181453

BMW 1 X4 X5 Series F20 F21 F25 F26 Antenna Aerial Diversity Trap Circuit 9181453

€23.95

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Part no. A4475400010

Mercedes Vito W447 Battery Cable Alternator Wiring Diesel OM651 A4475400010

€28.95

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Part no. 7627520-1

Mini R55 R56 LCI R60 One N16 1.6 98HP Engine ECU Kit DME 7627520 CAS3 + Key

€237.95

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Part no. 9383176

BMW F20 F30 F34 BCM FEM BSI Body Control Module Unit 9383176

€113.95

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Part no. 99661263403

Porsche Boxster 986 Door Wire Wiring Loom Driver's Door 99661263403

€70.95

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Part no. 9G9T-14B534-BB

Ford Mondeo Mk4 Door Window Control Rear Left Right N/O/S 9G9T-14B534-BB

€23.95

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Part no. 02Z911023H

Volkswagen VW Golf V 1.9 TDI Diesel Engine Starter Motor 02Z911023H

€32.95

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Part no. 8P0953519G

Audi TT 8J A3 8P Windscreen Wiper Stalk Switch Assembly 8P0953519G

€23.95

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Part no. EJ32-14D374-AC

Land Rover Evoque L538 Air Module Control Module ECU EJ32-14D374-AC

€42.95

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BMW F23 Cabrio Convertible Folding Top Roof ECU Control Unit CVM Module 7446712

€142.95

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Part no. 9380238

BMW F10 Body Gateway Control Module Unit 9380238

€37.95

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Part no. 4H0959591A

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

€28.95

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Part no. A0009008709

Mercedes W213 Tyre Pressure Control Module Unit A0009008709

€28.95

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Part no. 8H0959655E

Audi A4 S4 B7 Cabrio Air Module Control Unit ECU Impact Sensor 8H0959655E

€23.95

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Part no. 9267085

Antenna Amplifier BMW F01 F10 F13 Aeral Diversity 868 MHZ Control Unit 9267085

€23.95

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Part no. A2045400608

Mercedes W204 Front Bumper PDC Wiring Parking Loom Harness A2045400608

€47.95

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Part no. 8583657

Wiring Harness BMW F20 E90 LCI Mini R56 LCI Engine Glow Plug Module 8583657

€23.95

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Part no. 5N0035341G

Volkswagen Golf Scirocco CC Multimedia Interface Module Box 5N0035341G

€23.95

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Part no. A0025421119-1

Relay Unit Mercedes W163 W168 W203 W211 4-Pin Black Hella A0025421119 Set 2x

€23.95

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Part no. 06N971627B

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

€47.95

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Part no. 5Q0907530AC

Volkswagen Golf Mk7 Gateway Control Unit Module 5Q0907530AA

€37.95

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Part no. A1775408101

Mercedes W177 W243 W247 Door Wiring Cable Harness Loom Driver Side A1775408101

€56.95

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Part no. 9136726-2

BMW Mini Cooper R55 R56 Multifuse B Battery Power Distributor Cable 9136726

€23.95

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Part no. A0009003101

Mercedes W204 W212 W221 Fuel Pump Module Control Unit A0009003101

€23.95

Free delivery: Mar 6 – 11

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Part no. 8513249

BMW X3 F25 20dX Diesel N47N 184HP Engine Module ECU DDE 8513249 Automatic

€85.95

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Part no. CPLA-15K866-CF

Range Rover L405 PDC Module Parking Aid Control Unit CPLA-15K866-CF

€113.95

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Part no. 9394668

BMW F06 LCI Footwell Module Control Unit ECU FRM III 9394668

€118.95

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Part no. 169102698R

Mercedes W415 Fuel Pump Module Control Unit 169102698R

€32.95

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Part no. DWM500021

Land Rover Discovery 4 L319 Battery Tray Panel Base Mount DWM500021 5H2218N378AA

€23.95

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Part no. 4H0907217F

Audi A7 4G Front Camera Assistance Line Unit 4H0907217F

€569.95

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Part no. A0025428419

Relay Mercedes W176 W246 4-Pin Black Hella 12V A0025428419

€23.95

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Part no. 8512415-12

Mini Cooper SD R60 ALL4 N47N 143HP Engine Control Unit ECU DDE 8512415 Automatic

€66.95

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Part no. A2058201201

Sunroof Wiring Mercedes C205 C238 Panoramic Motor Cable Harness A2058201201

€23.95

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Part no. 8W6971029BF

Audi A5 F5 Front Door Wiring Harness Cable Driver's Side 8W6971029BF

€85.95

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Part no. A2059003740

Mercedes A205 Convertible Comfort Control Unit Module A2059003740

€85.95

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Part no. A9078209400

Mercedes Sprinter W907 W910 Radio Stereo Player Head Unit A9078209400

€104.95

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Part no. 9233034-SBR

PDC Parking Sensor BMW X5 E70 F10 F11 F12 Ultrasonic Sensor Space Grey 9231283

€23.95

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Part no. 7608801

Valve Cable BMW F20 F21 F30 F31 Petrol N13 Valve Tronic Wiring Harness 7608801

€23.95

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Part no. 6782372

BMW X1 X3 Z4 E83 LCI E84 E89 E90 E91 E92 Speed Sensor Cluster 6782372

€23.95

Free delivery: Mar 6 – 11

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Part no. 8486997

Mini F55 F56 F57 Integrated Supply Module Electrical Control Unit Module 8486997

€23.95

Free delivery: Mar 6 – 11

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Part no. 3D0941329B

Volkswagen Passat B7 Headlight Cornering Module Control Unit 3D0941329B

€51.95

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Part no. A2049006003

Radio Player Mercedes W204 Audio 20 Navi CD Player Head Unit A2049006003

€218.95

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Part no. 6820526

Head Unit BMW F20 F21 Radio Media GPS Sat Navigation Unit 6820526

€142.95

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Part no. 9196100

Mini Cooper One F55 F56 F57 B Pillar Upper Column Airbag Sensor 9196100

€23.95

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Part no. 7638003

BMW F20 F21 F22 F23 F34 LCI F22 F30 F36 Starter Ground Cable 7638003

€23.95

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Part no. 7641649

BMW F10 F20 F30 N20 125i 328i 528i N20 Wiring Harness Engine Module 1 7641649

€85.95

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Part no. 9261614

BMW 1 2 Series F20 F21 F22 Rear Bumper PDC Ultrasonic Sensor Glacier Silver

€23.95

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Part no. A0009828323

Mercedes W176 W246 Power Relay Control Module 5 Pin 12V A0009828323

€23.95

Free delivery: Mar 6 – 11

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Part no. 8P4971693M

Audi A3 8P Door Wiring Harness Loom Cable Rear Left Right N/O/S 8P4971693M

€23.95

Free delivery: Mar 6 – 11

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Part no. 4G0907697F

Audi TT FV LED Headlight Ballast Module Daytime Running Lights Unit 4G0907697F

€47.95

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Part no. 8J0971349CD

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

€28.95

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Part no. CK52-14300-AC

Range Rover L405 V8 Positive Battery Wiring Loom Wire Cable Lead CK5214300AC

€37.95

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Part no. A0009051600

Mercedes W207 W212 W221 Front Windscreen Windshield Camera A0009051600

€23.95

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Part no. BJ32-19G255-CA

Range Rover L405 Amplifier Aerial Receiver Unit Right O/S Lower BJ32-19G255-CA

€23.95

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Part no. 6960227

BMW E65 E66 Sensor Air Bag Front Left Door N/S Module Airbag 6960227

€23.95

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Part no. A0024463140-4

Mercedes W169 A160 CDI 95HP M266.920 Engine ECU Kit A0024463140 Automatic

€222.95

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Part no. A2129000004

SAM Module Mercedes W212 Fuse Box Relay Control Unit A2129000004

€23.95

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Part no. A0009062822

Alternator Generator Mercedes W207 W212 W906 Engine Diesel 200A 14V LRA03818

€89.95

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Part no. E87-E90-PLUG-SOCKET-LOOM-PDC

BMW E81 E82 E87 E88 E90 E91 E92 Plug Socket Loom PDC Parking Sensor

€23.95

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Part no. 8P4971693AB

Audi A3 8P Door Wiring Harness Loom Cabling Rear Left Right N/O/S 8P4971693AB

€23.95

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Part no. 9136725

BMW Mini Cooper One R55 R56 Multifuse B Battery Power Distributor 9136725

€23.95

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Part no. 7192742

BMW Z4 Series E89 Battery Holder Hold Down Strap Bracket 7192742

€24.95

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Part no. 3403208

BMW X3 Series E83 Ultrasonic Alarm System Module Control Unit 3403208

€33.95

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Part no. A1775402811

Mercedes W177 W243 W247 Rear Door Wiring Harness Cable Left N/S A1775402811

€32.95

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Part no. 4G0035061Q

Audi Q5 8R Multimedia Radio Control Module Head Unit 4G0035061Q

€284.95

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Showing 1486-1584 of 13731 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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