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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Mercedes-Benz M ML W163 Centre Console Wiring Harness Cable Loom A1635402333

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Mercedes-Benz A B W169 W245 Bracket Starter Alternator Control Unit A1695457740

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Mercedes W168 A 160 CDI OM668 Engine Control Module A6681530979

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BMW 5 Series E60 E61 Alarm System Unit Ultra Sonic Module 6980089

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BMW F20 F21 F22 F30 F31 Engine Starter Motor N20 N26 N55 Petrol 7638194

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BMW E84 F25 F26 N20 Engine Sensor Module Wiring Cable Loom Harness 7619136

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Mercedes Vaneo W414 Front Left Right Door N/O/S Control Unit Module A4148200526

€23.95

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Mercedes Vaneo W414 Sprinter W901 W902 W903 Fuse Box Battery A0035453501

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Mercedes-Benz Vaneo W414 Cable Starter Line Positive Line Battery A4145400130

€23.95

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BMW X3 3 Series E46 E83 LCI 1 Start Point Housing Bracket Base B 8385157

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BMW 7 Series E65 E66 Cable Harness Loom Front Door Wiring Left N/S 6934010

€32.95

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€23.95

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Fuse Box Unit Mercedes CL S C215 W220 1 Front Right O/S ECU A2205401124

€23.95

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BMW E46 N46 Wiring Harness Engine Gearbox Module Loom Cable 7540369

€94.95

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BMW F80 M3 F82 F83 M4 Wiring Harness Engine Gearbox Module 7848469

€94.95

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BMW X5 Series E70 Footwell Light Control Module Unit LEAR FRM II NSW 9170452

€132.95

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BMW E53 E60 E65 E81 E87 E90 E91 Bulb Holder Turn Indicator 7160897

€23.95

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Mercedes ML W163 Relay 4-Pin Grey Tyco A0025422619

€23.95

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Mercedes ML W163 Cover Footwell Fuse Box Trim Right A1636801080

€23.95

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Mercedes ML W163 Fuse Relay Box ECU Cover Trim A1635400382

€23.95

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BMW 1 5 Series F10 F11 F20 F21 LCI B47 Starter Acoustic Vibration Plug 8571350

€23.95

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BMW F20 F30 LCI Wiring Harness Engine Gearbox Module 120dX 320dX B47 8586573

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BMW Z4 Series E85 Cable Loom Passenger's Door Wiring Harness 6986987 6986982

€56.95

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BMW 3 X3 Z4 Series E46 E83 E85 Engine Control Unit Box Bottom Part 7534921

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Mercedes A B C Class W169 W203 W245 Outside Air Temperature Sensor A0005428418

€23.95

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BMW X3 E83 Cable Loom Door Passenger Side Wiring Harness 3412570

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Mercedes CLK W203 W209 Antenna Amplifier Radio Right O/S A2038209489

€23.95

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Mercedes-Benz C-Class W203 Alarm Sensor Module Unit A2038219751

€23.95

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Mercedes C-Class W203 Roof Alarm Motion Sensor Cover Trim Grey A2038219751

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Mercedes-Benz A-Class W169 Fuse Box Unit Holder Bracket Frame A1695453740

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BMW 1 Series F20 114d 116d ed N47N Wiring Harness Engine Glow Module 8514766

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BMW F10 F30 F31 LCI N57N Wiring Harness Engine Glow Module 8583653

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Mini Cooper 2 R50 R52 R53 W10 1.6 Petrol Engine Starter Motor Remy 7570488

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Mini Cooper R57 Convertible Cabrio Petrol Fuse Box 9213373

€23.95

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Mercedes C CLK Class W203 C209 Engine Bay Fuse Box Right O/S Cover A2038301613

€23.95

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Mercedes-Benz C CLK Class W203 C209 Vacuum Solenoid Valve A2038000178

€23.95

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Mercedes W203 Door Control Module Rear Left N/S A2038202185

€23.95

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Mini One D R50 R53 Cooper S Fuse Box 1405523

€23.95

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Mercedes-Benz C-Class W203 Door Control Module Right Rear O/S A2038202285

€23.95

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BMW X5 Z4 E46 E53 E85 Drive Window Lifter Motor Left N/S Front 8362063

€23.95

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€23.95

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€23.95

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Mercedes A B ML Class W166 W169 W245 Interior Temperature Sensor A1718300272

€23.95

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Mercedes W169 W245 Diesel Engine Starter Wiring Loom Cable A1695400209

€23.95

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PDC Display Mercedes W169 W211 Parking Distance Sensor Control Unit A1715420123

€23.95

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Mercedes A E Class W169 W211 Parking Sensor Display Control PDC A0015423723

€23.95

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Starter Motor Mercedes W169 W245 Diesel Engine A0051517401

€28.95

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Mercedes A C E Class 1 W169 W203 W211 OBD Diagnostic Plug Cover A2025402373

€23.95

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Mercedes-Benz CLC-Class CL203 Antenna Amplifier Rear Right O/S A2038270642

€23.95

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Mercedes W203 Battery Terminal Fuse Box Electrical Unit A2035450803

€23.95

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BMW F21 F22 F23 Wiring Loom Harness Passenger Side 9287441

€23.95

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BMW E39 X5 E53 Z4 E85 Drive For Window Lifter Motor Right O/S 8362064

€23.95

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Mercedes A W168 Petrol Engine Starter Alternator Electrical Cable A1685400830

€23.95

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Mercedes W168 Air Module Belt Locking System Sensor Control Unit Module ECU

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Mini Cooper Cabrio R52 Battery Cable Plus Pole 7541084

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...

Showing 4258-4356 of 11791 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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