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. A2115452601

Mercedes ML W164 Prefuse Fuse Distribution Box Front A2115452601

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129000004-2

SAM Module Mercedes W212 Fuse Box Relay Control Unit A2129000004

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1179009200

Mercedes W176 Air Module Belts System Control Unit ECU Bosch A1179009200

PLN 237.95

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Part no. A1729051301

Mercedes SLK R172 Roadster Antenna Amplifier Control Module A1729051301

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2115455332

Mercedes C219 SAM Module Comfort Control Unit A2115455332

PLN 61.95

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Part no. A2125406505

Mercedes W212 Door Wire Wiring Loom Front Right O/S A2125406505

PLN 142.95

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Part no. A1698207426

Mercedes-Benz A B Class W169 W245 Door Control Unit Right O/S Rear A1698207426

PLN 47.95

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Part no. A2129004407

Display Screen Mercedes W204 W212 Information Navigation Dashboard A2129018103

PLN 237.95

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Part no. A1668203426

Mercedes W166 C292 Front Seat Adjuster Module Unit Left Right N/O/S A1668203426

PLN 189.95

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Part no. A4155404305

Microphone Cable Mercedes Citan W415 Wiring Loom Cable Harness 27083202

PLN 85.95

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Part no. A1779002207

Mercedes W177 Rear Left Right N/O/S Door Control Module A1779002207

PLN 142.95

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Part no. A2218705093

Mercedes W221 Door Control Module Unit ECU Rear Left Right N/O/S A2218705093

PLN 189.95

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Part no. A2105400230

Mercedes-Benz E-Class W210 Battery Positive Plus Cable Loom Harness A2105400230

PLN 56.95

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Part no. A2535403700

Mercedes X253 Rear PDC Parking Aid Sensors Harness Wiring Loom Cable A2535403700

PLN 161.95

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Part no. A2139068801

Mercedes W205 W213 Fuse Box Rear SAM Module Electrical Unit A2139068801

PLN 66.95

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Part no. A2118704785

Mercedes W211 Front Seat Memory Control Unit Module Left Right N/O/S A2118704785

PLN 142.95

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Part no. A1645400641

Mercedes-Benz M-Class W164 Battery Ground Earth Strap Cable Wiring A1645400641

PLN 123.95

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Part no. A2055403606

Mercedes W205 Front Axle Damper Adjustment Right O/S Wiring Harness A2055403606

PLN 123.95

Free delivery - Mon, Nov 24

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Part no. A0015424723-1

Mercedes W204 W207 W221 Parking Sensor Display Control PDC A0015424723

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2049000300

Mercedes W212 Media Interface Control Unit Module Communication A2049000300

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A9069000401

Mercedes Sprinter W906 Door Module Front Right O/S Control Unit A9069000401

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129003502

Mercedes W212 Xenon Headlight Ballast Control Unit Module Hella A2129003502

PLN 470.95

Free delivery - Mon, Nov 24

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Part no. A1635400441

Mercedes-Benz M-Class ML W163 Ground Cable Right O/S Wheel Arch A1635400441

PLN 93.95

Free delivery - Mon, Nov 24

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Part no. A9075400500

Mercedes W907 Battery Cable Wiring Loom Harness Cabling A9075400500

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A9069820109-1

Mercedes W907 Positive Battery Terminal Cover Cap Trim Red A9069820109

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2469002616

Mercedes W176 W246 PDC Parking Distance Sensor Control Unit Module A2469002616

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A6511501879

Mercedes W639 OM651.940 113 CDI 136HP Engine Unit Module ECU A6511501879 Manual

PLN 474.95

Free delivery - Mon, Nov 24

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Part no. A4475400053

Mercedes Vito W447 Negative Battery Cable A4475400053

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A0009051910

Battery Cable Mercedes W177 W247 Negative Lead Terminal Harness A0009051910

PLN 75.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1645400350-1

Mercedes ML W164 Fuse Prefuse Box Jump Start Terminal A1645400350

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2059006822

Module Mercedes W205 Relay Body Control Module Unit SAM BCM A2059006822

PLN 56.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009821212

Energy Distributor Mercedes W205 W212 W213 W906 Control Unit Module A0009821212

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A0015424623-1

Mercedes-Benz C E A207 W204 W212 1 Front Parking PDC Display Panel A0015424623

PLN 37.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1769051000

Mercedes W176 Front Crash Impact Air Module Sensor Unit A1769051000

PLN 284.95

Free delivery - Mon, Nov 24

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Part no. A6549061400

Starter Motor Mercedes W213 S213 W238 OM654 Diesel Engine Actuator A6549061400

PLN 189.95

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Part no. A2465400508

Battery Cable Mercedes C117 W176 W246 Alternator Wiring Harness A2465400508

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2129060105

Fuse Box Mercedes W212 Rear SAM Relay Control Unit Module A2129060105

PLN 132.95

Free delivery - Mon, Nov 24

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Part no. A1569007702

Signal Actuation Module Mercedes W176 W246 SAM Control Unit ECU A1569007702

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A1779007403

Mercedes W177 Interior Ambiance Control Module ECU Unit A1779007403

PLN 227.95

Free delivery - Mon, Nov 24

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Part no. A2118704026

Mercedes W211 Door Module Rear Left N/S Control Unit ECU A2118704026

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A6402002770-1

Alternator Belt Tensioner Mercedes W169 W245 OM640 Diesel Holder Mounting Panel

PLN 112.95

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Part no. A0035421019

Relay Mercedes C117 GLA X156 ML W166 W176 W246 5 Pins Yellow A0035421019

PLN 42.95

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Part no. A2135452040

Mercedes W213 Head Unit Bracket Control Unit Module Holder Mount A2135452040

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A0465456628

Mercedes W203 W204 W218 Front Seat Wiring Loom Plug Connector A0465456628

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A2125406250

Mercedes-Benz W212 SAM Fuse Prefuse Box Relay Control Unit A2125406250

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A0009828223

Mercedes W213 Power Relay 4 Pin 12V Hella A0009828223

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2118705526

Mercedes W219 Motorola Telephone Control Module DC UHI MOST A2118705526

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2513200158-1

Valve Block Mercedes W251 W906 Air Suspension Control Unit Module A2513200158

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2218200210

Mercedes W221 Seat Occupancy Mat Control Unit Sensor A2218200210

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2135401217

Mercedes W213 OM642 Diesel Engine Alternator Wiring Loom Harness A2135401217

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A1669006507

Door Module Mercedes ML W166 C292 Rear Right O/S Door Control Unit A1669006507

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2135409616-1

Mercedes Sprinter W910 Battery Sensor Negative Terminal Cable Wiring A2135409616

PLN 123.95

Free delivery - Mon, Nov 24

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Part no. A4479063000

Mercedes Vito W447 Heater Blower Motor Fan Resistor A4479063000

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. a0045468040

Mercedes W204 W212 W221 Power Distributor Box Conectors Socket A0045468040

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2038219751-2

Mercedes W203 CL203 Roof Alarm Motion Sensor Cover Trim Black A2038219751

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Mercedes Sprinter W907 W910 Air Module Sensor Unit ECU A9079000304

-33%

Part no. A9079000304

Mercedes Sprinter W907 W910 Air Module Sensor Unit ECU A9079000304

Promo price

PLN 408.95

PLN 275.95

Free delivery - Mon, Nov 24

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Part no. A2229004213-1

Keyless Go Mercedes GLC X253 Keyless Entry Control Module A2229004213

PLN 80.95

Free delivery - Mon, Nov 24

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Part no. A2439008400

Mercedes GLC X253 Sound Audio Amplifier Module Rear Harman A2439008400

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A6519009302-4

Mercedes W639 116 CDI 651.940 163HP Engine Module ECU Kit A6519009302 Key Lock

PLN 1,757.95

Free delivery - Mon, Nov 24

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Part no. A2055401604

Mercedes W205 Battery Cable Wiring Harness Loom Petrol Hybrid A2055401604

PLN 100.95

Free delivery - Mon, Nov 24

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Part no. A0038212751

Mercedes-Benz M S W221 ML W164 Airbag Impact Crash Sensor Door A0038212751

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2059006330

Mercedes W205 SAM Module Front Body Comfort Control Unit ECU A2059006330

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A0015453916

Mercedes CL 203 Automatic Gearbox Control Unit Module ECU A0015453916

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A1635401041

Mercedes-Benz M ML W163 Ground Earth Strap Cable Wiring A1635401041

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2711501920

Engine Wiring Mercedes W204 C207 W212 M271 Harness Loom Cable A2711501920

Product currently unavailable

Part no. A2056186000

Mercedes W205 W238 Rear Battery Holder Bracket Mount Strap Clamp A2056186000

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2139007436

Mercedes W177 W213 Gearbox Transmission Control Module Unit ECU A2139007436

PLN 379.95

Free delivery - Mon, Nov 24

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Part no. A0009829608

Mercedes W204 W212 W222 Auxiliary Additional Generator Battery A0009829608

PLN 705.95

Free delivery - Mon, Nov 24

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Part no. A0008201277

Mercedes-Benz W906 Light Repeater Lamp Wiring Loom A0008201277

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2215450801

Mercedes W221 Fuse Box Control Unit SAM Module Relay A2215450801

PLN 845.95

Free delivery - Mon, Nov 24

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Part no. A2049009907-2

Mercedes W204 Navigation Radio Player Head Unit Computer A2049009907

PLN 664.95

Free delivery - Mon, Nov 24

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Part no. A6399003701

Mercedes W639 Tire Tyre Pressure Control Module Unit A6399003701

PLN 474.95

Free delivery - Mon, Nov 24

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Part no. A2129008818

Keyless Go Module Mercedes W207 W212 W218 ECU Door Lock Control Unit A2129008818

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2049005003

Mercedes S204 Estate Fuse Box Rear SAM Module Control Unit A2049005003

PLN 222.95

Free delivery - Mon, Nov 24

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Part no. A2389009000

Air Module Mercedes A205 A238 A217 SRS Protection Control Unit A2389009000

PLN 332.95

Free delivery - Mon, Nov 24

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Part no. A1715409606

Mercedes R171 Wiring Cable Harness Front Passenger Door Wiring Loom A1715409606

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A0045468540

Mercedes W221 Distributor Box Block Control Unit Relay A0045468540

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1728202100

Mercedes W176 W207 W246 USB Interface Multimedia Adapter Connector A1728202100

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A4709820700

Mercedes W470 Glow Plug Relay Module Unit A4709820700

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A0009062103

Mercedes W205 Alternator Generator Petrol Engine Valeo 150A 14V A0009062103

PLN 474.95

Free delivery - Mon, Nov 24

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Part no. A2075401650

Mercedes W204 Fuse Prefuse Box Relay Electrical Control Unit A2075401650

PLN 256.95

Free delivery - Mon, Nov 24

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Part no. A0009822523

Mercedes W156 W242 W246 W447 Relay 4-Pin Black Hella A0009822523

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1718600205

Mercedes R171 Passenger Seat Air Module Control Unit Module A1718600205

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A0141541302

Alternator Mercedes W164 W221 W251 Engine Generator 220A Valeo A0009063522

PLN 351.95

Free delivery - Mon, Nov 24

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Part no. A2075405205

Mercedes W207 Door Cable Wiring Loom Front Left Right Door N/O/S A2075405205

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A0038212851

Mercedes SLK R171 Crash Sensor Air Bag Impact Module Control Unit A0038212851

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A2124400414

Mercedes C207 W207 W212 Fuel Pump Module Diesel Control Unit ECU A2124400414

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A2514401909

Mercedes W164 W251 Wiring Loom Cable Harness Door Front Left Right A2514401909

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A1693300907-1

Mercedes A B W169 W245 Front Left N/S Suspension Control Track Arm A1693300907

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2059009427

Mercedes W205 Front Air Module SRS Control Unit ECU A2059009427

PLN 132.95

Free delivery - Mon, Nov 24

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Part no. A2465406607

Positive Cable Mercedes W176 W246 Battery Lead Plus Pole Red A2465406607

PLN 66.95

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Part no. A4475400010

Mercedes Vito W447 Battery Cable Alternator Wiring Diesel OM651 A4475400010

PLN 123.95

Free delivery - Mon, Nov 24

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Part no. A2129000204

Mercedes W212 Fuse Box Control Unit SAM Module Relay A2129000204

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1669004402

Door Module Mercedes W176 W246 Front Right O/S Control Unit Module A1669004402

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0038208426

Crash Sensor Mercedes ML W164 W221 Front Rear Impact Airbag Unit A0038208426

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009008709

Mercedes W213 Tyre Pressure Control Module Unit A0009008709

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A0009820212

Mercedes W176 W212 W246 Voltage Converter Inverter Power Distributor A0009820212

PLN 94.95

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Part no. A2208205042

Mercedes-Benz S W220 Front Seat Adjustment Left Motor Actuator N/S A2208205042

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129004206

Door Module Mercedes W212 E-Class Rear Right O/S Control Unit A2129004206

PLN 37.95

Delivery - Mon, Nov 24

If paid before 14:00

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Showing 892-990 of 3165 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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