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. A2124400314

Mercedes W164 W204 Fuel Pump Module Control Unit ECU A2124400314

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129069900

Player Audio Mercedes C207 W212 Head Unit CD Media Radio Controller A2129069900

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0015425918-ALB

Mercedes W202 C208 W208 W220 Parking Distance Sensor PDC Almandine Black

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2468201915

AUX Jack Port Mercedes C117 W246 W176 Wiring Loom Cable Harness A2468201915

PLN 61.95

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Part no. A2055408104

Battery Cable Mercedes W205 X253 Diesel OM651 Alternator Wiring A2055408104

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A4479009808

Mercedes Vito W447 Fuse Box Relay Control Unit Electric Module SAM 4479009808

PLN 664.95

Free delivery - Mon, Nov 24

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Part no. A2139001722

Mercedes W213 W907 Transmission Gearbox Control Unit Module ECU A2139001722

PLN 142.95

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Part no. A2539008007

Mercedes X253 Rain And Light Sensor Control Unit Module ECU A2539008007

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A6399001001

Mercedes W639 PDC Parking Park Sensor Distance Control Module A9064460046

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2054404136

Mercedes W205 Battery Lead Wiring Loom Cable Hybrid Cable Harness A2054404136

PLN 189.95

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Part no. A2048210651

Mercedes W204 Air Module Impact Crash Sensor Door A2048210651

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2229063701

Fuse Box Mercedes W205 W222 Electrical Relay Box Module Unit A2229063701

PLN 75.95

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Part no. A0038207726

Mercedes W212 Siren Alarm Horn Signal Module Unit A0038207726

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2118704126

Mercedes W221 Door Control Module Right Rear O/S A2118704126

PLN 94.95

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Part no. A1725402513

Mercedes SLK R172 Rear Window Heating Cable Loom Heat Wiring Harness A1725402513

PLN 142.95

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Part no. A2056186100

Mercedes W205 W238 Rear Battery Holder Bracket Mount Strap Clamp A2056186100

PLN 42.95

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Part no. A1779069601

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

PLN 427.95

Free delivery - Mon, Nov 24

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Part no. A2129003408

Mercedes W204 W221 Fuel Pump Module Control Unit A2129003408

PLN 93.95

Free delivery - Mon, Nov 24

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Part no. A1679050700

Mercedes W177 Crash Impact Sensor Front Door Left Right Unit A1679050700

PLN 56.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A6519007401-6

Mercedes SLK R172 250CDI 651.980 204HP Engine ECU Kit Ignition + Key A6519007401

PLN 807.95

Free delivery - Mon, Nov 24

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Part no. A2055406921

Battery Wiring Mercedes X253 Diesel OM651 Alternator Harness Cable A2055406921

PLN 80.95

Free delivery - Mon, Nov 24

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Part no. A2135409916

Earth Ground Cable Mercedes W213 S213 Battery Wiring Loom Engine A2135409916

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A0325452332

Mercedes CLK W209 Automatic Gearbox EGS Control Unit Module ECU A0325452332

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2078200075

Antenna Mercedes W212 Keyless Go Comfort Access Antenna Module Unit A2078200075

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2059054415

Heater Climate Mercedes W205 C253 Control A/C Unit Switch Panel A2059054415

PLN 332.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009055700

Mercedes W639 Brake Yaw Rate Sensor ECU A0009055700

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A0009006713

PDC Module Mercedes W176 W246 Parking Assist Distance Control Unit A0009006713

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2118706189

Mercedes W164 W169 W211 W245 Disc CD Changer A2118706189

PLN 123.95

Free delivery - Mon, Nov 24

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Part no. A2059003740

Mercedes A205 Convertible Comfort Control Unit Module A2059003740

PLN 393.95

Free delivery - Mon, Nov 24

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Part no. A2139068701

Mercedes W205 W213 Fuse Box Rear SAM Module Electrical Fuse Unit A2139068701

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A2139002210

Mercedes-Benz W176 W205 W207 W213 Bluetooth Control Unit Module ECU A2139002210

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0035421019-1

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

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A0048273745

iPod Interface Mercedes W204 W207 W212 Module Control Unit ECU A0048273745

PLN 123.95

Free delivery - Mon, Nov 24

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Part no. A1779009902

Mercedes W177 Front Windscreen Windshield Camera Multi Purpose Unit A1779009902

PLN 275.95

Free delivery - Mon, Nov 24

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Part no. A2469064201

Antenna Amplifier Mercedes X117 W176 W205 Rear Aerial Module A2469064201

PLN 127.95

Free delivery - Mon, Nov 24

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Part no. A4159064900-1

Mercedes Citan W415 Alternator Generator OM607 Diesel Engine 150A 14V 231000026R

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A9065420044

Mercedes W906 Bracket Mount Fuse Distribution Box A9065420044

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2129001529

Mercedes-Benz C E Class W204 W207 W212 Front Left Door N/S Control Unit Module

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A0121542002

Mercedes W903 OM611 Diesel Alternator Engine Generator 14V 90A A0121542002

PLN 474.95

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Part no. A1775402111

Mercedes W177 Door Harness Loom Cable Wiring Rear Left Right N/O/S A1775402111

PLN 85.95

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Part no. A0025422619

Mercedes ML W163 Relay 4-Pin Grey Tyco A0025422619

PLN 75.95

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Part no. A2079001100

Door Module Mercedes C207 W207 Front Left N/S Control Unit ECU A2079001100

PLN 94.95

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Part no. A2075403434

PDC Wiring Mercedes W204 W207 Parktronic Parking Sensor Cable Rear A2075403434

PLN 75.95

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Part no. A2165420018

Yaw Rate Sensor Mercedes W169 W245 W211 W219 Turn Rate Sensor A2165420018

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A1698209126

Door Module Mercedes W169 W245 Rear Left N/S Control Unit A1698209126

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2059009230

Air Conditioning Module Mercedes W205 C253 A/C Control Unit ECU A2059009230

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A2118700110

Mercedes W219 Hood Bonnet Light Solar Sensor Module A2118700110

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2034404432

PDC Wiring Mercedes CL203 Front Bumper Parking Sensor Loom Cable A2034404432

PLN 284.95

Free delivery - Mon, Nov 24

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Part no. A2185409606

Mercedes C218 Parktronic Parking Sensor Wiring Cable Rear PDC A2185409606

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2113231126

Mercedes-Benz E Class W211 Front Left Anti Roll Bar Clamp Bracket A2113231126

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2429007001

Mercedes W176 W204 W212 Telematics Communication Control Unit Module A2429007001

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A0009820012

Mercedes W176 W212 W246 Voltage Converter Power Distributor Inverter

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2535407830

Mercedes C253 AMG Rear Bumper PDC Wiring Parking Sensor Loom Harness A2535407830

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2129004106

Door Module Mercedes W212 Rear Left N/S Control Unit A2129004106

PLN 37.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2661538479-1

Mercedes W169 A150 Petrol M266.920 95HP Engine ECU Kit A2661538479 Automatic

PLN 712.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2518204426

Mercedes V251 W164 Front Lamp Headlight Control Module Unit HELLA A2518204426

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A9078200301

Mercedes W907 Radio Professional System Controller Head Unit A9078200301

PLN 569.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2535400601

Mercedes X253 Starter Motor Wiring Harness Cable A2535400601

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2129004500

Mercedes C207 W212 Fuse Box Relay Control Unit SAM Module A2129004500

PLN 569.95

Free delivery - Mon, Nov 24

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Part no. A2048205189

Mercedes-Benz C-Class W204 Aerial Antenna Amplifier Unit A2048205189

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A2118700026

Bluetooth Module Mercedes W203 W211 W219 Control Unit Hands Free A2118700026

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1779001304

Door Module Mercedes C118 W177 W247 Front Left N/S Control Unit A1779001304

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A1729060205

Mercedes SLK R172 Rear SAM Fuse Relay Box Control Unit Module A1729060205

PLN 379.95

Free delivery - Mon, Nov 24

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Part no. A2789060600

Mercedes W166 R172 W205 C207 W212 C216 Engine Starter Motor 12V A2789060600

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A9065450003-1

Mercedes Sprinter W906 Fuse Box Cover Trim Panel Lid Grey A6395450003

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2749003900

Mercedes Vito W447 Electronic Control Unit Module ECU A2749003900

PLN 949.95

Free delivery - Mon, Nov 24

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Part no. A2075400740

Fuse Box Mercedes W204 Battery Terminal Control Unit Module A2075400740

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A1679008309

Mercedes W177 W247 Telematics Module Communication Control Unit A1679008309

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A0009006516

Bluetooth Module Mercedes S205 W205 W177 Active Parking Assist Control Rear

PLN 474.95

Free delivery - Mon, Nov 24

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Part no. A2479001416

Mercedes CLA C118 W177 W247 4matic AWD Module Control Unit A2479001416

PLN 351.95

Free delivery - Mon, Nov 24

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Part no. A6459060800

Starter Motor Mercedes W176 W246 C117 Diesel Engine Denso A6459060800

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2229055804

Mercedes CLA C117 W176 W205 Aerial Antenna Amplifier Unit A2229055804

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2139009406

Mercedes W213 Display Screen Information Navigation Dashboard A2139009406

PLN 332.95

Free delivery - Mon, Nov 24

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Part no. A2465404300

Mercedes W176 Door Harness Loom Cable Wiring Rear Right A2465404300

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A1646803535

Mercedes-Benz M-Class ML W164 B-Pillar Trim Cover Bottom Left N/S A1646801935

PLN 66.95

Free delivery - Mon, Nov 24

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Part no. A0035421619

Mercedes W177 Relay 052 Engine Fuse Box Relay Slot B D E 70A Tyco A0035421619

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2038207385

Mercedes W203 ECU Control Unit Crash Impact Sensor Module Air Module A2038207385

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2229005315

Bluetooth Module Mercedes W176 W205 Multimedia Control Unit ECU A2229005315

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A6395450203

Mercedes-Benz Vito W639 Fuse Box Cover Cap Trim A6395450203

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A1718701410

Mercedes SLK R171 Alarm Anti Theft System Control Module Unit Roof A1718701410

PLN 473.95

Free delivery - Mon, Nov 24

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Part no. A1729006613

Mercedes SLK R172 GPS Navigation System Screen Display A1729006613

PLN 759.95

Free delivery - Mon, Nov 24

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Part no. A0009068206

Alternator Generator Mercedes W177 W247 M260 Petrol Engine 200A 14V A0009068206

PLN 1,424.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2124407038

Negative Cable Mercedes W212 Battery Earth Wiring Loom A2124407038

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2038301613

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

PLN 56.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1698203185

Mercedes-Benz A B Class W169 W245 Door Control Module Left Rear N/S A1698203185

PLN 46.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009058000

Windscreen Camera Mercedes W207 W221 Front Windshield Module Unit A0009058000

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2125405710

Mercedes W212 PDC Wiring Parktronic Parking Sensor Cable Rear A2125405710

PLN 61.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2075406010-1

Mercedes W207 Front Bumper PDC Wiring Parking Sensor Loom Harness A2075406010

PLN 379.95

Free delivery - Mon, Nov 24

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Part no. A1679009011

Mercedes W205 C213 X253 Rear Door Control Module Unit ECU Left N/S A1679009011

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A0009009639

Mercedes EQA350 H243 4matic DC Current Charge Connection Module OBL + BR293

PLN 3,799.95

Free delivery - Mon, Nov 24

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Part no. A2059007037

Mercedes W205 W213 Fuse Box Rear SAM Module Electrical Fuse Unit A2059007037

PLN 427.95

Free delivery - Mon, Nov 24

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Part no. A1668201089

Mercedes W176 Radio Aerial Antenna Amplifier Booster Unit Module A1668201089

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A0009009213

Mercedes W447 Fuel Pump Control Module A0009009213

PLN 332.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2469005010

Mercedes W176 W246 Parktronic Parking Control Unit Module ECU A2469005010

PLN 94.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A1185402504

Mercedes C118 Door Harness Rear Left N/S Door Wiring Loom A1185402504

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A0045468440

Mercedes W177 Power Distributor Connector Plug Unit A0045468440

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1775404507

Mercedes V177 C118 W247 Fuse Box Relay Control Unit Module A1775404507

PLN 189.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A0015454416

Mercedes CL203 M271 Automatic Gearbox EGS Control Module Unit ECU A0015454416

PLN 123.95

Free delivery - Mon, Nov 24

If paid before 14:00

Part no. A2049006301

Mercedes W204 Rear SAM Module Fuse Box Control Unit A2049006301

PLN 142.95

Free delivery - Mon, Nov 24

If paid before 14:00

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Showing 1387-1485 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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