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. A1779005109

Door Module Mercedes C118 W177 H243 Front Left N/S Door Control A1779005409

PLN 313.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2479002513

Telematic Control Module Mercedes W447 W907 W910 Telematics Unit A2479002513

PLN 474.95

Free delivery - Mon, Nov 24

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Part no. A1175450800

Negative Battery Terminal Mercedes C117 W176 W246 Lead Connector A1175450800

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2118703226

Mercedes W245 Bluetooth Control Unit Module Hands Free A2118703226

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009002308

Mercedes W447 W906 Adblue Module Exhaust Gas Control Unit ECU A0009002308

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A1779007616

Mercedes C118 W177 W247 Front Door Module Control Unit Right O/S A1779007616

PLN 170.95

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Part no. A2701506733

Wiring Harness Mercedes W246 M270 Petrol Engine Wiring Harness Loom A2701506733

PLN 948.95

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Part no. A2125455640

Mercedes W212 Battery Holder Mount Bracket Support E-Class A2125455640

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2139002722

Door Module Mercedes W205 W213 X253 Rear Left Door Control Unit A2139002722

PLN 94.95

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Part no. A1775401910

Mercedes W177 Door Wiring Rear Door Left N/S Module Harness Cables A1775401910

PLN 113.95

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Part no. A1635450440

Mercedes-Benz M-Class ML W163 Holder Bracket Engine Control Unit A1635450440

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1769980001

Door Wiring Plug Mercedes W176 W246 Cable Lead Connector A1769980001

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A1669000618

Mercedes-Benz A B Class W176 W246 Front Right Door O/S Control Unit Module ECU

PLN 61.95

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Part no. A1779003806

Door Module Mercedes C118 W177 W247 Front Left N/S Control Unit A1779003806

PLN 123.95

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Part no. A1679003118

Door Module Mercedes W205 W213 X253 Front Right O/S Control Unit A1679003118

PLN 322.95

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Part no. 237104376R

Mercedes Citan W415 109 CDI OM607.951 Engine Control Unit ECU 237104376R Manual

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A6519065700

Mercedes W907 314 CDI Engine Alternator Generator Valeo A6519065700

PLN 664.95

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Part no. A1694710141

Mercedes W169 W245 Fuel Pump Cable Harness Bracket Mount Trim A1694710141

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2465401850

Prefuse Box Mercedes W176 OM607 Fuse Relay Control Unit A2465401850

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2059000524

Mercedes W207 W212 Telematics Services Communication Module A2059000524

PLN 104.95

Free delivery - Mon, Nov 24

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Part no. A2198202426

Mercedes CLS W219 Door Module Front Right O/S Control Unit A2198202426

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2118209626

Mercedes W211 W219 Alarm Control Module Unit ECU A2118209626

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1636880035-1

Mercedes-Benz M-Class ML W163 1 Fuse Box Relay Lid Cover Trim A1636880035

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1715409245

Mercedes SLK R171 Gateway Control Unit Gateway Module ECU A1715409245

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A1679000111

Mercedes W167 W177 Radio Stereo Player Sat Nav Head Unit ECE A1679000111

PLN 1,139.95

Free delivery - Mon, Nov 24

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Part no. A2045402410

Mercedes W204 Door Wiring Front Left N/S Door Cable Harness A2045402410

PLN 66.95

Free delivery - Mon, Nov 24

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Part no. A1695451940

Mercedes W169 W245 Fuse Box Module Unit A1695451940

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A6229000500

Mercedes W447 OM622.951 Engine Control Unit Module ECU Kit A6229000500 Manual

PLN 949.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1779008103

Mercedes W177 W247 Telematics Module Communication Control Unit A1779008103

PLN 189.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2118200885

Mercedes E-Class W211 S211 Bluetooth Control Unit Module ECU A2118200885

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1779069601-1

Fuse Box Mercedes W177 W247 Front Relay Engine Control Unit Module A1779069601

PLN 522.95

Free delivery - Mon, Nov 24

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Part no. A2048702789

Aerial Antenna Amplifier Mercedes W204 Estate Left N/S Booster Unit A2048702789

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2218704895

Mercedes W221 Door Module Rear Door Control ECU Unit Left N/S A2218704895

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2709002100-15

Mercedes C117 CLA 180 270.910 122HP Engine ECU Kit A2709002100 Automatic

PLN 1,899.95

Free delivery - Mon, Nov 24

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Part no. A2535400701

Mercedes A238 M276 Engine Alternator Wiring Loom Harness A2535400701

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A2134400200

Mercedes GLC 300e X253 Electric Drive Ground Earth Line Wire A2134400200

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A2139065706-1

Fuse Box Mercedes W205 W213 Front Engine Compatment Relay Module A2139065706

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A1668200689

Antenna Amplifier Mercedes W176 Aerial Module Unit Rear A1668200689

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1679004511

Door Module Mercedes W205 W213 C253 Rear Left N/S Control Unit ECU A1679004511

PLN 265.95

Free delivery - Mon, Nov 24

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Part no. lhd-A2215409509

Mercedes W221 Front Camera Wiring Harness Cables Night Vision A2215409509

PLN 161.95

Free delivery - Mon, Nov 24

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Part no. A2049012704

Mercedes W204 ECU Control Unit Crash Impact Sensor Air Module A2049012704

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2229005914

Mercedes W205 Rear SAM Module Control Unit A2229005914

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A6519007500-23

Mercedes W204 C207 W212 E250CDI OM651.924 204HP Engine ECU A6519007500 Automatic

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A2741501802

Mercedes W213 Engine Wiring Harness Cable Loom A2741501802

PLN 759.95

Free delivery - Mon, Nov 24

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Part no. A2038200189

Mercedes C CLK Class W203 W209 Antenna Amplifier Radio Left N/S A2038200189

PLN 84.95

Free delivery - Mon, Nov 24

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Part no. A2139065706

Mercedes W205 W213 Front Engine Compatment Fuse Relay Box Module A2139065706

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2129014204

Mercedes-Benz W212 ECU Control Unit Sensor Module Airbag A2129014204

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2518703390

Mercedes W251 Rear Passengers Entertainment Control Unit A2518703390

PLN 331.95

Free delivery - Mon, Nov 24

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Part no. A2049001813-1

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

PLN 284.95

Free delivery - Mon, Nov 24

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Part no. A2048701826

Mercedes S204 Door Module Front Left N/S Control Unit ECU A2048701826

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2035400031

Mercedes CLK W203 C209 Negative Battery Terminal Cable A2035400231

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A9069005701

Mercedes W639 W906 Air Module SRS Control Unit ECU A9069005701

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009002414

Module Fuel Pump Mercedes W205 C253 Control Module Unit A0009002414

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A2229004220

Mercedes GLC X253 Communication Module LTE Telephone Bluetooth A2229004220

PLN 664.95

Free delivery - Mon, Nov 24

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Part no. A0061512501

Mercedes W203 W204 Diesel Engine Starter Motor A0061512501

PLN 123.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009059101

Mercedes-Benz E-Class W207 W212 ESP Yaw Rotation Rate Sensor A0009059101

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009828023

Fuse Relay Mercedes C117 W166 W176 W205 X253 Black 4 Pin 12V A0009828023

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A0025421319-4

Mercedes W204 Genuine Universal Car Relay 4-Pin Tyco X4 Black A0025421319

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1725403405

Mercedes R172 OM651 Diesel Alternator Wiring Harness Cable Loom A1725403405

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2661501233

Engine Wiring Mercedes W169 W245 M266 Petrol Cable Loom Harness A2661501233

PLN 474.95

Free delivery - Mon, Nov 24

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Part no. A2129005101

Fuse Box Mercedes W212 Rear SAM Relay Fuse Box Control Module A2129005101

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A4148200526

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

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0025428419

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

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2319014702

Mercedes R231 Air Module Control Unit ECU SRS Module A2319014702

PLN 949.95

Free delivery - Mon, Nov 24

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Part no. A6401501933

Engine Wiring Mercedes W169 W245 OM640 Cable Loom Harness A6401501933

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A1645400750

Mercedes ML W164 Battery Fuse Box Power Distribution A1645400750

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A6401501891-1

Mercedes W169 W245 A200 B200 CDI OM640.941 140HP Engine ECU Kit Key A6401501891

PLN 664.95

Free delivery - Mon, Nov 24

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Part no. A0009060401

Mercedes W204 OM651 14V 150A Alternator Generator Engine Start/Stop A0009060401

PLN 208.95

Free delivery - Mon, Nov 24

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Part no. A0009004839

Mercedes C118 W177 C247 Battery Control Module Unit ECU A0009004839

PLN 1,519.95

Free delivery - Mon, Nov 24

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Part no. A1644400837

Mercedes W164 Parking Sensor Wiring Loom Cable Harness Front PDC A1644400837

PLN 332.95

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Part no. A0009055504-TNG1

Mercedes W166 C207 Front Rear PDC Parking Distance Sensor Tenorite Grey - 755

PLN 42.95

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Part no. A2129004518

Door Control Unit Mercedes W204 W207 W212 Front Left N/S Module ECU A2129004518

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2048708626

Mercedes W212 Media Interface Control Module Unit ECU A2048708626

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2701504400

Mercedes W176 M270 Petrol Engine Wiring Harness Loom Cable A2701504400

PLN 807.95

Free delivery - Mon, Nov 24

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Part no. A4475406777

Alternator Wire Mercedes Vito W447 Battery Alternator Cable A4475406777

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A1669005605

Door Module Mercedes W176 W246 Front Left N/S Control Unit VST A1669005605

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A1698200611

Mercedes W245 Bluetooth Module Telephone Control Unit A1698200611

PLN 379.95

Free delivery - Mon, Nov 24

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Part no. A2135400329

Mercedes X253 Electrical Wiring Harness Cable Hybrid A2135400329

PLN 379.95

Free delivery - Mon, Nov 24

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Part no. A2118701185

Air Module Mercedes W211 W219 Control Unit ECU A2118701185

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A2059006923

Air Conditioning Module Mercedes C205 X253 A/C Control Unit ECU A2059006923

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A0009009114

Mercedes W205 Air Conditioning Climate Control Module ECU A0009009114

PLN 104.95

Free delivery - Mon, Nov 24

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Part no. A9075406849

Mercedes Sprinter W907 Ground Line Battery Earth Cable Wire A9075406849

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2198200326

Door Module Mercedes C219 Rear Door Right O/S Control Module A2198200326

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A6429005601

Mercedes C207 Glow Plug Relay Unit Control Module A6429005601

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A2034404532

Mercedes CLC-Class CL203 Rear Parking Sensor Wiring Loom Cable PDC A2034404532

PLN 66.95

Free delivery - Mon, Nov 24

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Part no. rhd-A0009052902

Mercedes W212 Negative Cable Battery Terminal Wiring A0009052902

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A2218702993

Mercedes CL W216 W221 Air Module Control Unit A2218702993

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A0009006907

Mercedes W205 Tire Pressure Control Module A0009006907

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1779008206

Mercedes W177 Ambience Illumination Light Control Module Unit A1779008206

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2466200028

Mercedes W176 Battery Support Holder Bracket Mount A2466200028

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A0025451201

Mercedes W169 W245 W906 Fuse Box Carrier A0025451201

PLN 94.95

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Part no. A0014460340

Mercedes W245 B150 CDI OM266.920 Engine Control Unit Module ECU A0014460340

PLN 42.95

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Part no. A2219006303

Mercedes W221 Radio Multimedia Head Unit A2219006303

PLN 2,849.95

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Part no. A2475400700

Mercedes W177 Rear Axle Wheel RPM Speed Left N/S Sensor Wire Harness A2475400700

PLN 75.95

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Part no. A2129005912

Mercedes W204 Fuse Box Relay SAM Control Unit Module A2129005912

PLN 332.95

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Part no. A1699000200

Mercedes-Benz A B W169 W245 Front Right Door Control Unit Module A1699000200

PLN 65.95

Free delivery - Mon, Nov 24

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Part no. A9079020303

Mercedes Sprinter W907 W910 AIr Module Sensor Unit ECU A9079020303

PLN 664.95

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Part no. A2189000104

Mercedes CLS X218 Parktronic PDC Parking Assist Control Module A2189000104

PLN 61.95

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Part no. A0009063701

Mercedes W205 Alternator 14V/200A Valeo Diesel Engine M626 A0009063701

PLN 474.95

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Showing 793-891 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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