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. A2045401706

Mercedes W204 Front Left Right N/O/S Seat Wiring Loom Cable Harness A2045401706

Product currently unavailable

Part no. A2129003922-1

Mercedes W212 Fuse Box Rear SAM Relay Control Unit Module A2129003922

Product currently unavailable

Part no. A2469009413

Control Unit Mercedes W176 W246 Body Control Module ECU A2469009413

Product currently unavailable

Part no. A1698705494

Mercedes W169 W245 CD Player Radio Stereo Head Unit A1698705494

Product currently unavailable

Part no. RHD-A1725403505

Mercedes R172 OM651 Starter HV Battery Wiring Harness Cable Loom A1725403505

Product currently unavailable

Part no. rhd-A1718201635

Mercedes SLK R171 Microphone Hands Free System Interior Mic Unit A1718201635

Product currently unavailable

Part no. A0009823108

Mercedes 12V Accumulator Battery 74Ah 680A A0009823108

Product currently unavailable

Part no. A2118210097

Mercedes E-Class W211 Front Door Wiring Loom Harness Rubber Grommet A2118210097

Product currently unavailable

Part no. A2115453101

Mercedes W211 Fuse Box Control Unit SAM Module Relay A2115453101

Product currently unavailable

Part no. A2059067904

Mercedes W205 DRL Ballast Headlight Control Unit Right O/S Module A2059067904

Product currently unavailable

Part no. A0495453128

Steering Lock Cable Mercedes W169 W204 Connector Plug Wiring Loom A0495453128

Product currently unavailable

Part no. A4478200035

Microphone Mercedes W447 W907 W910 Hands-free Interior Mic Unit A4478200035

Product currently unavailable

Part no. A1718205626

Mercedes SLK R171 Airbag Module Air Bag SRS Control Unit ECU A1718205626

Product currently unavailable

Part no. A2048709558-2

Mercedes W204 W212 Radio Control Function Button Knob Controller A2048709558

Product currently unavailable

Part no. A1668201089

Mercedes W176 Radio Aerial Antenna Amplifier Booster Unit Module A1668201089

Product currently unavailable

Part no. A6549007900

Mercedes W177 A 220d 654.920 654920 190HP Engine ECU Unit A6549007900 Automatic

Product currently unavailable

Part no. A6421508100-2

Mercedes W251 R 350 CDI 642.950 224HP Engine Unit ECU Kit A6421508100 Key + Lock

Product currently unavailable

Part no. A1669068201

Fuse Box Mercedes GLE W166 C292 W463 Relay Control Unit Module A1669068201

Product currently unavailable

Part no. A1698207126

Door Module Mercedes W169 W245 Front Left N/S Control Unit A1698207126

Product currently unavailable

Part no. A2049062102-1

Mercedes W246 W205 W176 Engine Cooling Radiator Fan Control Unit Module

Product currently unavailable

Part no. A4479009509

Mercedes W447 114CDI SAM Comfort Control Unit Module Box ECU A4479009509

Product currently unavailable

Part no. A2129004718

Door Module Mercedes W212 Front Right Control Unit Module A2129004718

Product currently unavailable

Part no. A0009062000

Mercedes W212 W221 Blind Spot Radar Sensor Rear Left Right N/O/S A0009062000

Product currently unavailable

Part no. A2129008404-1

Radio Head Unit Mercedes W212 COMAND Navi CD DVD Player Navigation A2129008404

Product currently unavailable

Part no. A1645404301

Mercedes W164 SAM Module Comfort Control Unit A1645404301

Product currently unavailable

Part no. A2035454201

Mercedes W203 C209 SAM Control Unit Module Fuse Box Front A2035454201

Product currently unavailable

Part no. A6395400431

Mercedes Vito W639 Earth Cable Battery Terminal Wiring A6395400431

Product currently unavailable

Part no. A6461502734

Mercedes W204 C220 CDI 170HP M646.811 Engine Unit ECU Kit A6461502734 Key Lock

Product currently unavailable

Part no. A2129008707

Mercedes W212 Display Screen Multifunction Dashboard Control Unit A2129008707

Product currently unavailable

Part no. A2078203226

Airbag Module Mercedes W207 C207 Coupe Air Bag SRS Control Unit ECU A2078203226

Product currently unavailable

Part no. A2045407335

Mercedes W204 C207 W212 Earth Ground Cable Transmission To Body A2045407335

Product currently unavailable

Part no. A9079002404

Mercedes Sprinter W907 W910 Electronic Ignition Module Control Unit A9079002404

Product currently unavailable

Part no. A2049062900

Mercedes W204 Navigation CD Player Radio Stereo Sat Nav Head Unit A2049062900

Product currently unavailable

Part no. A6394405706

Mercedes W639 Front Axle Brake Wear Indicator Loom Wiring Harness A6394405706

Product currently unavailable

Part no. A2045409907

Mercedes W204 Battery Wiring Cable Harness Loom A2045409907

Product currently unavailable

Part no. A2711504279-1

Mercedes W204 C180 156HP Kompressor 271.910 Engine ECU Kit A2711504279 Key Lock

Product currently unavailable

Part no. A6519005203-1

ECU Mercedes C205 C250d Diesel OM651.921 204HP Engine Control Unit Automatic

Product currently unavailable

Part no. A6519007500-12

Mercedes W204 C 220 CDI 651.911 170HP Engine Control ECU Kit A6519007500 Manual

Product currently unavailable

Part no. A2139005311

Mercedes W213 Head Unit CD Media Player Audio Auto Radio Controller A2139005311

Product currently unavailable

Part no. A4155410102

Mercedes Citan W415 Battery Tray Housing Box Case Covering 648944878R

Product currently unavailable

Part no. A0009006418

Mercedes W213 Parking Control Unit Module ECU Parktronic A0009006418

Product currently unavailable

Part no. A9064408234

Mercedes W906 Positive Battery Cable Wiring Loom Harness A9064408234

Product currently unavailable

Part no. A1695400762

Parking Module Mercedes W169 W245 PDC Distance Control Unit Sensor A1695400762

Product currently unavailable

Part no. A2769001500

Mercedes W204 C350 276.957 306HP BE Engine Module ECU A2769001500 Automatic

Product currently unavailable

Part no. A0005401869

Mercedes-Benz A208 C208 W208 W210 Battery Cable Box Connector A0005401869

Product currently unavailable

Part no. A9065400113

Mercedes-Benz Sprinter W906 Rear Door Licence Plate Lighting Wiring Cable

Product currently unavailable

Part no. A6429005601

Mercedes C207 Glow Plug Relay Unit Control Module A6429005601

Product currently unavailable

Part no. A2479001015

Instrument Cluster Module Mercedes W177 C118 Speedo Gauges Control A2479001015

Product currently unavailable

Part no. A1669000213

Mercedes ML W166 Radio Stereo CD Player Audio Sat Nav Head Unit A1669000213

Product currently unavailable

Part no. A9068200486

Radio Player Mercedes W639 W906 Audio Stereo CD Head Unit Display A9068200486

Product currently unavailable

Part no. A6399000300

Mercedes Vito Viano W639 Side Sliding Door Control Unit Module ECU A6399000300

Product currently unavailable

Part no. A2469007818

Radio CD Player Mercedes W176 W246 Audio Navigation Stereo Head Unit A2469007818

Product currently unavailable

Part no. rhd-A2045400124

Mercedes-Benz C-Class W204 Fuse Box Housing Cover A2045400124

Product currently unavailable

Part no. A2514402009

Mercedes-Benz M-Class ML W164 Front Left Right N/O/S Door Wiring Loom Harness

Product currently unavailable

Part no. A6269060100

Starter Mercedes W205 Diesel OM626 Engine Starter Motor Bosch A6269060100

Product currently unavailable

Part no. A6461532491-1

Mercedes Vito W639 OM646.982 150HP Engine Module ECU Kit A6461532491 Key Lock

Product currently unavailable

Part no. A0009004434

Mercedes W177 W247 Telematics Bluetooth Module Control Unit ECU A0009004434

Product currently unavailable

Part no. A2129008207

Mercedes W204 C200 Fuse Box Front SAM Control Module Relay Box A2129008207

Product currently unavailable

Part no. A2749003900

Mercedes Vito W447 Electronic Control Unit Module ECU A2749003900

Product currently unavailable

Part no. A2789001300

Mercedes W212 E63 AMG M157.981 558HP Engine Control Unit Module ECU A2789001300

Product currently unavailable

Part no. A2479002814

Mercedes W177 Front Windscreen View Camera Unit A2479002814

Product currently unavailable

Part no. A9069005103-1

Mercedes W906 Radio CD Player Audio Bluetooth Head Unit A9069005103

Product currently unavailable

Part no. A0009068504

Alternator Mercedes Vito W447 Engine Generator 200A Valeo A0009068504

Product currently unavailable

Part no. A0009823308

Mercedes 12V Accumulator Battery 100Ah 760A A0009823308

Product currently unavailable

Part no. A2215406645

Mercedes W221 PDC Parking Distance Sensor Control Unit Module ECU A2215406645

Product currently unavailable

Part no. A0009002126

AdBlue SCR Module Mercedes W907 W910 W447 Exhaust Gas Cleaning A0009002126

Product currently unavailable

Part no. A2049060105-1

Mercedes W204 SAM Control Unit Module Fuse Box Relay Rear A2049060105

Product currently unavailable

Part no. A2661540802

Mercedes-Benz W169 W245 Alternator Generator Petrol 90A A2661540802

Product currently unavailable

Part no. A1715451001-1

Mercedes SLK R171 Fuse Box SAM Relay Control Unit Module A1715451001

Product currently unavailable

Part no. A0025427419

Mercedes-Benz A B E M W169 W245 W210 W163 Relay 5-Pin Yellow Hella A0025427419

Product currently unavailable

Part no. A2218001548-1

Mercedes-Benz S-Class W221 Remote Trunk Closing Hydraulic Lines Unit A2218001548

Product currently unavailable

Part no. A2229004015

Mercedes W205 Air Con Conditioning Module A/C Climate Control Unit A2229004015

Product currently unavailable

Part no. A1669000101

Mercedes W204 Becker Navigation Map Pilot Control Unit Module A1669000101

Product currently unavailable

Part no. A2079005000

Mercedes A207 Convertible Roof Top Control Unit Module ECU A1718204226

Product currently unavailable

Part no. A2129002627

Mercedes W212 Fuse Box Relay Module Control Unit A2129002627

Product currently unavailable

Part no. A9068201589

Mercedes Sprinter W906 Radio Stereo Audio Head Unit A9068201589

Product currently unavailable

Part no. A1765408207

Mercedes W176 Front Bumper Parking Sensor Wiring Loom Cable Harness A1765408207

Product currently unavailable

Part no. A6421508900-5

Mercedes W204 C350CDI BE OM642.834 Engine Control Unit ECU A6421508900

Product currently unavailable

Part no. A2198202026

Door Module Mercedes C219 Front Door Right O/S Control Unit A2198202026

Product currently unavailable

Part no. A6519007500-6

Mercedes W204 C220CDI BlueEFFICIENCY OM651.911 Engine ECU Kit A6519007500 Key

Product currently unavailable

Part no. A2049006909

Mercedes W204 COMAND Navigation CD Player Radio Sat Nav Head Unit A2049006909

Product currently unavailable

Part no. A0018276604

Mercedes W207 Connection Media Interface Cable AUX Wire A0018276604

Product currently unavailable

Part no. A2661538879-1

Mercedes W245 B170 M266 Engine Control ECU Kit A2661538879 Key Lock Automatic

Product currently unavailable

Part no. A6401508079

Mercedes W169 W245 A180 B180 CDI OM640.940 109HP Engine ECU Kit A6401508079 Keys

Product currently unavailable

Part no. A2319006307

Mercedes SL R231 Navigation CD Player Radio Stereo Sat Nav Head Unit A2319006307

Product currently unavailable

Part no. A0009003213

Adblue Module Mercedes W166 W212 R172 C218 C292 Control Unit ECU A0009003213

Product currently unavailable

Part no. A2118201526

Mercedes S211 Rear Door Control Module Left N/S A2118201526

Product currently unavailable

Part no. A2118705189

Sound Amplifier Mercedes W204 W211 W212 C219 Audio Harman Becker AMP A2118705189

Product currently unavailable

Part no. A2469003108

Radio Head Unit Mercedes W176 W246 COMAND Navi Player Control Unit A2469003108

Product currently unavailable

Part no. A6429002900-8

Mercedes W204 C350 CDI OM642.830 231 HP Engine Control ECU A6429002900 Automatic

Product currently unavailable

Part no. A6395400182-1

Mercedes Vito W639 Cover Fuse Box Case Trim Panel Lid A6395400182

Product currently unavailable

Part no. A0009055701

Distance Radar Module Mercedes W204 C218 Front Distronic Unit A0009055701

Product currently unavailable

Part no. A2218707493

Mercedes W221 Seat Control Module Front Right O/S A2218707493

Product currently unavailable

Part no. A2049067702-1

Mercedes W204 Fuse Box Rear SAM Module Electrical Fuse Unit A2049067702

Product currently unavailable

Part no. A1679002108

Mercedes Sprinter W907 W910 Door Module Control Unit Front Left N/S A1679002108

Product currently unavailable

Part no. A2079004200

Mercedes W207 A207 Convertible Roof Module Folding Top Control Unit A2079004200

Product currently unavailable

Part no. A2129003514

Mercedes W204 Sam Unit Fuse Box Control Module A2129003514

Product currently unavailable

Part no. A0009063822

Alternator Generator Mercedes W176 W246 Diesel Engine Bosch 175A A0009063822

Product currently unavailable

Part no. rhd-A2535400710

Door Wiring Mercedes X253 Rear Left Right N/O/S Door Harness Loom A2535400710

Product currently unavailable

...

Showing 3268-3366 of 5405 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