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. NAPA 80Ah Accumulator

NAPA AGM Accumulator Battery 80Ah 800A 12V AGM115N

Product currently unavailable

Part no. 6977724-2

BMW E87 Xenon Footwell Light Module Control Unit ECU PL2 FRMFA 6977724

Product currently unavailable

Part no. 9172020

BMW E64 Convertible Airbag Module Sensor ECU Air Bag Unit 9172020

Product currently unavailable

Part no. A2711538579

Mercedes R171 SLK 200 163HP 271.944 Kompressor Engine ECU A2711538579 Manual

Product currently unavailable

Part no. 1K0907383F

Audi A3 8P Towing Hitch Tow Bar Control Module Unit ECU 1K0907383F

Product currently unavailable

Part no. A2139002729

Amplifier Mercedes W205 Sound Amplifier Rear Module Premium Sound E A2139002729

Product currently unavailable

Part no. 6863502

BMW F10 F20 F30 VDC Rear M Sport Suspension Control Unit Module 6863502

Product currently unavailable

Part no. 6977066

BMW X5 E70 Door Cable Harness Wiring 6977066 6937277

Product currently unavailable

Part no. A6461508072-1

Mercedes W639 2.2CDI OM646.980 Engine ECU Kit Unit A6461508072 Key Automatic

Product currently unavailable

Part no. A0009827403

Mercedes W205 Energy Distributor Power Electrical Control Unit A0009827403

Product currently unavailable

Part no. 7811701-1

BMW E87 E90 LCI 118d 318d N47 Diesel ECU KIT DDE 7811701 + CAS3 + Key Automatic

Product currently unavailable

Part no. 7557290

BMW 1 3 Series E87 E90 E91 120i 320i N46 ECU KIT DME CAS 2 key 7557290 Manual

Product currently unavailable

Part no. 9246185

Hifi Amplifier BMW E91 Touring Speaker System Control Unit Module 9246185

Product currently unavailable

Part no. 8512415-4

Mini Cooper D R55 R56 LCI N47N 112HP Diesel Engine ECU Kit DDE 8512415 CAS3 Keys

Product currently unavailable

Part no. A6421500841-1

Mercedes W221 S320 CDI OM642.930 235HP Engine ECU Kit A6421500841 Key Automatic

Product currently unavailable

Part no. rhd-9159066

BMW 5 Series E60 E61 LCI Switch Center Control Block Button

Product currently unavailable

Part no. A6401501091-1

Mercedes W169 W245 A200 B200 CDI OM640.941 140HP Engine ECU Kit A6401501091 Key

Product currently unavailable

Part no. 1P0035726A-1

Seat Leon Mk2 1P USB AUX Port Socket Connection Media Adapter 1P0035726A

Product currently unavailable

Part no. 5Q0937125G

Seat Ateca Fuse Relay Box Engine Bay Supply Unit 5Q0937125G

Product currently unavailable

Part no. 5Q0915089

Volkswagen Golf VII Auxiliary Battery Start Stop Control Module 5Q0915089

Product currently unavailable

Part no. 4L0971846A

Audi Q7 4L Boot Trunk Lid Holder Tailgate Wiring Loom Bracket 4L0971846A

Product currently unavailable

Part no. 6801345

BMW F20 LCI F22 F23 Sound Amplifier Harman Kardon Module Audio Unit ECU 6801345

Product currently unavailable

Part no. 259903137R

Mercedes Citan W415 Renault Kangoo Parktronic Parking Sensor Module 259903137R

Product currently unavailable

Part no. A2079004300

Mercedes A207 Convertible Roof Control Module Unit ECU Soft Top A2079004300

Product currently unavailable

Part no. 04692114AC

Jeep Grand Cherokee WK Commander XK Fuse Box Relay Control Unit 04692114AC

Product currently unavailable

Part no. A2049065602

Mercedes S204 Rear Trunk SAM Central Electric Base Control Module A2049065602

Product currently unavailable

Part no. 099-CAN

BMW 3 E90 E91 Autolads CAN-Bus Interface Steering Multistalk Adaptor 099-CAN

Product currently unavailable

Part no. 06B911023A

Audi A4 B7 2.0 TFSI Starter Motor Engine Motor Actuator Petrol 03L911021E

Product currently unavailable

Part no. A2749000700-2

Mercedes W204 C250 BlueEFFICIENCY M274.911 Engine ECU Kit A2749000700 Key Lock

Product currently unavailable

Part no. 9175867

BMW 5 Series E60 E61 Cable Loom Door Wiring Harness 9175867

Product currently unavailable

Part no. A4475450069

Mercedes Vito W447 Control Unit Fuse Box Compartment Mount A4475450069

Product currently unavailable

Part no. BOX-5203

BMW F30 CCC Android Apple CarPlay Head Unnit Retrofit Set Cables Module BOX-5203

Product currently unavailable

Part no. A2218706387

Mercedes W221 Trunk Release Remote Open Close Module Control Unit A2218706387

Product currently unavailable

Part no. 5B61723

BMW F10 F20 F30 Alarm Power Siren Horn Alarm System Unit 5B61723

Product currently unavailable

Part no. rhd-9172954

Head-Up Display BMW F01 F02 Trim Panel Cover Frame Dashboard Screen 9170364

Product currently unavailable

Part no. X39-737-102-001

VDO Pedal Interface II Control Unit Accelerator Module 12V/24V X39-737-102-001

Product currently unavailable

Part no. 6826794

Head Unit BMW F10 F20 F30 Navigation Sat Nav High Control Module Japan 6826794

Product currently unavailable

Part no. A6569001600

Mercedes W213 E350 656929 656.929 286HP Engine Unit ECU A6569001600 Automatic

Product currently unavailable

Part no. BK2T-18812-KA

Ford Transit Custom Roof Antenna Aerial Wiring Harness Loom Cable BK2T-18812-KA

Product currently unavailable

Part no. 9306742

BMW i3 I01 Dashboard Monitor Display Central NAV Information Screen 6,5" 9306742

Product currently unavailable

Part no. 6943283

BMW E60 Light Control Unit Module LEAR LM E6X LWR 6943283

Product currently unavailable

Part no. A2749062100-1

Starter Motor Mercedes W213 C238 C253 M274 Petrol Engine Actuator Denso DSN1205

Product currently unavailable

Part no. 231A03142R

Renault Trafic 3 Vauxhall Vivaro B Control Unit Module ECU EMM-T4 231A03142R

Product currently unavailable

Part no. 8616314

BMW F20 F21 F30 F31 N55 326HP M135i 335i Engine Control ECU DME 8616314 Manual

Product currently unavailable

Part no. 4H0919475AC

Audi A6 C7 PDC Parking Distance Control Module Unit ECU 4H0919475AC

Product currently unavailable

Part no. Steelmate PDC

Steelmate PDC Parking Assist System Interface Bundle Kit Module Sensors Speaker

Product currently unavailable

Part no. rhd-A2035401806

Mercedes-Benz C-Class W203 M111 Starter Wiring Positive Plus Cable A2035401806

Product currently unavailable

Part no. A2749000800-6

Mercedes W205 C200 274.920 184HP Engine ECU Kit A2749000800 2 Key + Lock Manual

Product currently unavailable

Part no. 8794119-1

BMW F20 F21 F30 F31 LCI Radio Professional Navigation Sat Nav Head Unit 8794119

Product currently unavailable

Part no. A1679002413

Mercedes W167 W177 Radio Stereo Nav Navigation Head Unit High A1679002413

Product currently unavailable

Part no. A2139003217

Gearbox Module Mercedes W177 W205 W213 Control Unit ECU Automatic A2139003217

Product currently unavailable

Part no. 8691836-4

BMW F20 F30 LCI 118i 318i B38 136HP Engine ECU Kit DME 8691836 Key FEM Automatic

Product currently unavailable

Part no. 7577968

BMW E60 E61 E90 E91 N52 325i 525i Engine Control Unit ECU DME 7577968 Automatic

Product currently unavailable

Part no. 6941590

BMW 5 Series E60 LCI Light Control Unit Module LCM LM E6X LWR LEAR 6941590

Product currently unavailable

Part no. 8K0971104F

Audi A4 B8 Rear Wiring Loom PDC Harness Parking Sensor 8K0971104F

Product currently unavailable

Part no. GPBM2022H-NBT

BMW F32 CarPlay Android Auto Tuning Solutions Head Unit Retrofit NBT MMI Box Set

Product currently unavailable

Part no. 7592080-2

BMW E90 E91 LCI 335i N54 306HP ECU Kit DME 7592080 CAS3 Key Sport Dual-Clutch

Product currently unavailable

Part no. 8V1035035E

MMI Head Unit Audi A3 RS3 8V Multimedia Navigation Control Module 8V1035035E

Product currently unavailable

Part no. 7808205-2

BMW E60 E61 LCI 530d M57N2 235HP Engine Control ECU KIT DDE 7808205 CAS3 Key

Product currently unavailable

Part no. 9203815

BMW F01 F02 F04 Footwell Light Module Control Unit ECU FRM III 9203815

Product currently unavailable

Part no. LT1T14B321AA

Ford Transit Connect Mk2 Air Module Control Unit ECU LT1T-14B321-AA

Product currently unavailable

Part no. 9239321

Head Unit BMW E81 E90 LCI Business System Car Infotaiment Computer CIC 9239321

Product currently unavailable

Part no. 7579142-20

BMW E87 LCI E90 120i 320i Petrol N43 170HP Engine ECU Kit DME 7579142 Manual

Product currently unavailable

Part no. 9326409

Door Wiring Harness BMW F31 F34 Front Driver Door Wiring Loom Cables 9326409

Product currently unavailable

Part no. 7E0937550

Fuse Box VW Transporter T5 2.0 TDi CAAA Power Distribution Point Box 7E0937550

Product currently unavailable

Part no. 9281722

BMW E93 Cabrio Convertible Folding Top Roof ECU Module CTM 9281722

Product currently unavailable

Part no. 6960255

BMW X5 Series E53 Light Check Module Control Unit ECU Lear LCM IV LWR 6960255

Product currently unavailable

Part no. 8510221-12

BMW E90 E91 LCI E92 330d N57 245HP ECU Engine Kit DDE 8510221 CAS3 Key Manual

Product currently unavailable

Part no. A0005458916

Mercedes W639 Automatic Gearbox EGS Control Unit Transmission Module A0005458916

Product currently unavailable

Part no. RHD-5N2971121

Volkswagen Tiguan 5N Door Wiring Harness Cable Loom Front Left N/S 5N2971121

Product currently unavailable

Part no. 6965710

BMW E92 Radio Signal Aerial Antenna Amplfier Diversity 315Mhz Booster 6965710

Product currently unavailable

Part no. 8P4971036F

Audi A3 8P Front Passenger Door Wiring Left N/S Harness Loom Cable 8P4971036F

Product currently unavailable

Part no. 7555361-8

BMW E60 E90 N52 325i 525i 218HP Engine ECU Kit DME 7555361 CAS2 Key Automatic

Product currently unavailable

Part no. 8W0035502B

Audi A4 B9 Wireless Charger Centre Console Phone Charging Module 8W0035502B

Product currently unavailable

Part no. 9117101

BMW X5 Series E53 Basic Body Control Unit Module GM3 9117101

Product currently unavailable

Part no. rhd-D1025-13

On-Board Screen BMW F20 F21 F30 F31 Information Display Touch Monitor 10,25"

Product currently unavailable

Part no. A6461500977

Mercedes Vito W639 OM646.980 Engine ECU Control Unit Module A6461500977 Manual

Product currently unavailable

Part no. rhd-9381040

BMW 1 2 F20 F21 LCI F22 F23 Central Information Display Screen 8,8" 9381040

Product currently unavailable

Part no. A2049061002-3

Mercedes W204 Radio CD Player COMAND Stereo Sat Nav Head Unit A2049061002

Product currently unavailable

Part no. 6864207

BMW F20 F23 LCI X3 F25 X4 F26 F30 F32 F33 Control Unit Module ICM High 6864207

Product currently unavailable

Part no. 2447787

BMW G11 G30 G31 X4 F26 Telematics Module Bluetooth Control Unit ECU 2447787

Product currently unavailable

Part no. 8734827

BMW F20 F30 LCI G30 G31 Head Unit Media Navigation Headunit Player 8734827

Product currently unavailable

Part no. 03L903023

Audi A3 8V Diesel Engine Starter Alternator Electrical 14V 140A 03L903023

Product currently unavailable

Part no. 8587952-3

Mini Cooper SD F55 F56 B47 170HP Engine ECU Kit DDE 8587952 Key BDC Lock Manual

Product currently unavailable

Part no. 7801217-4

BMW X3 E83 3.0d M57N2 218HP ECU Control Unit Kit DME 7801217 EWS3 Key Automatic

Product currently unavailable

Part no. A2049001813-1

Mercedes W204 CD Player Radio Stereo Navigation Sat Nav Head Unit A2049001813

Product currently unavailable

Part no. A2035454901-1

Mercedes CL203 Fuse Box Control Unit Module SAM A2035454901

Product currently unavailable

Part no. 8703399

BMW G30 F90 M5 Antenna Aerial Diversity Amplifier Unit 8703399

Product currently unavailable

Part no. 6915035

BMW 3 5 7 X5 Series E38 E39 E46 E53 GPS Navigation System Computer Unit 6915035

Product currently unavailable

Part no. A2095450901

Mercedes CLK W209 Convertible Fuse Box Rear SAM Module Control Unit A2095450901

Product currently unavailable

Part no. 8798185

BMW F20 F21 F30 F31 Head Unit Basic Media DAB Headunit 8798185

Product currently unavailable

Part no. 284B10847R

Renault Trafic 3 Vauxhall Vivaro B Body Control Module ECU BCM T4 284B10847R

Product currently unavailable

Part no. A4475408550

Mercedes W447 Rear Bumper Wiring Loom Parking Sensor Cable Harness A4475408550

Product currently unavailable

Part no. 8V4971687K

Audi A3 RS3 8V 5Dr Door Harness Loom Wiring Rear Left Right N/O/S 8V4971687K

Product currently unavailable

Part no. 8596362-5

BMW F20 F30 LCI 120d 320d B47 Engine ECU Kit DDE 8596362 FEM + Key Automatic

Product currently unavailable

Part no. A6549009400-1

Mercedes Vito W447 116 CDI 654.920 163HP Engine ECU Kit A6549009400 Key Lock

Product currently unavailable

Part no. A0034466040-1

Mercedes-Benz W169 W245 Engine Control Unit ECU Kit A0034466040 + 2 Keys Manual

Product currently unavailable

Part no. A2129003414-1

Fuse Box Mercedes C204 W204 Front Relay Control Unit Module SAM A2129003414

Product currently unavailable

Part no. 6971703-1

BMW 3 Series 1 E90 Radio Professional CD Player 65126971703 6971703

Product currently unavailable

...

Showing 17425-17523 of 21242 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