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. A2198200226

Door Module Mercedes C219 Rear Door Left N/S Control Module A2198200226

PLN 47.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2189006806

Mercedes W207 Harman Control Unit Module Amplifier Premium Sound A2189006806

PLN 2,849.95

Free delivery - Mon, Nov 24

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Part no. A0141542702-1

Alternator Generator Mercedes Vito W639 Sprinter W906 14V 120A Bosch A0141542702

PLN 284.95

Free delivery - Mon, Nov 24

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Part no. A2465400082

Mercedes-Benz A-Class W176 Cover Equipment Electrical Fuse Box A2465400082

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A6519007500-1

Mercedes W204 C220CDI BlueEFFICIENCY OM651.911 Engine ECU A6519007500 Automatic

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A6429002900-4

Mercedes W204 C350 CDI OM642.830 Engine Module ECU Kit A6429002900 Key Lock

PLN 2,042.95

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Part no. A2139005223

SAM Module Mercedes W213 C238 Control Unit Front ECU A2139005223

PLN 142.95

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Part no. A2319052600

Mercedes R172 Security Alarm Interior Protection Sensor Module Unit A2319052600

PLN 142.95

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Part no. A6512011909

Mercedes W212 OM651 Alternator Support Bracket Belt Tensioner Holder A6512011909

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1775408457

Mercedes W118 W177 Alternator Earth Cable Wiring Harness Loom A1775408457

PLN 341.95

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Part no. A0045467540

Mercedes W204 W221 Distributor Box Block Control Unit Relay A0045467540

PLN 61.95

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Mercedes C118 W167 W177 W206 W247 Stereo Amplifier Harman Kardon A2069055100

PLN 42.95

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Part no. A2125407605

Door Wiring Mercedes W212 Loom Cable Rear Left Right N/O/S A2125407605

PLN 46.95

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Part no. A0009058100

Mercedes ML W166 GL X166 SL R231 C292 Crash Impact Sensor A0009058100

PLN 42.95

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Part no. A0009003500

Mercedes W204 W212 Fuel Pump Module Control Unit ECU AMG C63 A0009003500

PLN 123.95

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Part no. A1638201126

Mercedes ML W163 Windscreen Rain Light Sensor Control Module A1638201126

PLN 61.95

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Part no. A2741504704

Mercedes X253 Engine Wiring Harness Line Supply Line A2741504704

PLN 474.95

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Part no. A2469005312

Mercedes X117 X156 W246 Relay Control Unit Module A2469005312

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2129002813

Mercedes W212 PDC Parking Distance Control Unit Module Sensor A2129002813

PLN 66.95

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Part no. A0005457616

Mercedes R171 VDO Transmission Control Unit Module EGS A0005457616

PLN 379.95

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Part no. A6421508900-6

Mercedes W207 E350 OM642.838 Engine Control Unit ECU Kit A6421508900 Automatic

PLN 1,899.95

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Part no. A1635402333

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

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2533402600

Mercedes X253 Hybrid GLC Battery Electrical Wiring Harness A2533402600

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A2128201689

Mercedes W212 Antenna Amplifier Aerial Module Unit A2128201689

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1729060105

Mercedes SLK R172 Rear Fuse Box SAM Relay Control Unit Module A1729060105

PLN 332.95

Free delivery - Mon, Nov 24

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Part no. A2049014503

Mercedes W212 Rain Light Solar Condensation Sensor Control Unit A2049014503

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2469008516

Parking Brake Module Mercedes W176 W246 Electric Control Unit ECU A2469008516

PLN 66.95

Free delivery - Mon, Nov 24

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Part no. A2229006008

Mercedes W205 W217 W222 Tailgate Trunk Control Module Unit A2229006008

PLN 94.95

Free delivery - Mon, Nov 24

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Part no. A0009820112

Mercedes W177 W207 Power Energy Distribution Unit Module A0009820112

PLN 51.95

Delivery - Mon, Nov 24

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Part no. A2216890614

Mercedes W221 PDC Distance Control Holder Bracket A2216890614

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A0009003505

Module Mercedes W205 Fuel Pump Control Module In Trunk Rear ECU A0009003505

PLN 85.95

Free delivery - Mon, Nov 24

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Part no. A2389007704

Communication Module Mercedes W205 W213 C253 Hermes LTE Control Unit A2389007704

PLN 379.95

Free delivery - Mon, Nov 24

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Part no. A1698702710

Mercedes-Benz A B Class W169 W245 Tow Protection ECO Switch Button Unit Module

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1729006903

Seat Module Mercedes W204 W212 Control Unit Front Left Right N/O/S A1729006903

PLN 474.95

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Part no. A2229002921

Mercedes W205 W213 Head Unit Navigation Radio DAB High Control Unit A2229002921

PLN 1,899.95

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Part no. A2711504733

Mercedes W204 Injection Electrical Wiring M271 Petrol Engine Cable A2711504733

PLN 56.95

Delivery - Mon, Nov 24

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Part no. A2465450500

Mercedes-Benz A B W176 W246 Gearbox Control Module Bracket Holder A2465450500

PLN 56.95

Delivery - Mon, Nov 24

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Part no. A6519007500-4

Mercedes W204 C250 CDI BlueEFFICIENCY OM651.911 Engine ECU A6519007500 Automatic

PLN 246.95

Free delivery - Mon, Nov 24

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Part no. A2139004119

Module Mercedes W205 Drivetrain Gearbox Control Module Unit A2139004119

PLN 189.95

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Part no. A9079004807

Air Module Mercedes W907 W910 Control Unit ECU A2139008828

PLN 569.95

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Part no. A1331510745

Mercedes C117 CLA 45 AMG Heat Shield Alternator Plate Petrol M133 A1331510745

PLN 94.95

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Part no. A1768200704

Sunroof Wiring Mercedes C117 W176 Panoramic Motor Cable Harness A1768200704

PLN 47.95

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Part no. A2129003922

Mercedes W212 Fuse Box Rear SAM Relay Control Unit Module A2129003922

PLN 132.95

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Part no. A1729058200

Mercedes W204 W207 W212 W221 Humidity Temperature Sensor Unit A1729058200

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2055457540

Mercedes W205 C238 X253 W213 Inner Firewall Contact Support A2055457540

PLN 93.95

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Part no. A6395406209

Wiring Loom Mercedes W639 Vito Cable Door Wiring Cable A6395406209

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A1775408101

Mercedes W177 W243 W247 Door Wiring Cable Harness Loom Driver Side A1775408101

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A1698207326

Mercedes-Benz A B Class W169 W245 Door Control Unit Left N/S Front A1698207326

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A1779001203

Mercedes W177 Door Control Module Rear Left Right N/O/S A1779001203

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2229002009

Mercedes W205 W222 Door Module Control Unit Rear Left N/S A2229002009

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A6395407809

Wiring Loom Mercedes W639 Vito Cable Sliding Door Rear Left N/S A6395407809

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2215400205

Mercedes W221 Brake Pad Wear Indicator Sensor Front Left Right N/O/S A2215400205

PLN 94.95

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Part no. A2128203985

Mercedes W204 W212 Door Module Rear Left N/S Control Unit Module A2128203985

PLN 42.95

Delivery - Mon, Nov 24

If paid before 14:00

Part no. A2479003216

Mercedes C118 W247 Head Unit Radio Sat Nav Navigation Control Unit A2479003216

PLN 2,374.95

Free delivery - Mon, Nov 24

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Part no. A1648702726-1

Mercedes W164 Boot Trunk Lid Tailgate Control Unit Module ECU A1648702726

PLN 189.95

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Part no. A2058200704

Sunroof Wiring Mercedes W205 X253 Panoramic Roof Motor Cable Harness A2058200704

PLN 142.95

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Part no. A2198202026

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

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. A9079002407

Mercedes W907 Electronic Ignition Module Control Unit A9079002407

PLN 607.95

Free delivery - Mon, Nov 24

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Part no. A1695403905

Mercedes-Benz A B W169 W245 Door Cable Harness Wiring Loom Rear Left Right

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2055406304

Mercedes W205 Hybrid Battery Cable Starter Wiring Loom Harness A2055406304

PLN 113.95

Free delivery - Mon, Nov 24

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Part no. A2218208202

Mercedes W221 Front Centre Dashboard Tweeter Speaker A2218208202

PLN 61.95

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Part no. A2129004402

Door Module Mercedes W212 E-Class Front Left N/S Control Unit A2129004402

PLN 46.95

Delivery - Mon, Nov 24

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Part no. A1648205585

Mercedes W164 Air Module Control Unit SRS Sensor ECU Bosch A1648205585

PLN 61.95

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Part no. A1729003406

Mercedes SLK R172 Roadster Soft Top Folding Roof Control Module A1729003406

PLN 141.95

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Part no. A1725402209

Electrical Cable Mercedes R172 Transmission To Body Wiring Harness A1725400035

PLN 47.95

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Part no. A2049009004

Parking Module Mercedes W204 S204 PDC Distance Control Unit Sensor A2049009004

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2059007218

Automatic Closing Motor Mercedes S205 Estate X253 Trunk Lid A2059007218

PLN 189.95

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Part no. A2139000124

Mercedes W213 W222 C257 Amplifier Module Audio Burmester A2139000124

PLN 1,899.95

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Part no. A2044402607

Earth Ground Cable Mercedes W204 W207 Battery Wiring Loom Engine A2044402607

PLN 42.95

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Part no. A9064461442

Mercedes Sprinter W906 ECU Control Unit Sensor Module A9064461442

PLN 75.95

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Part no. A0055421218

Crash Sensor Mercedes W176 W204 W212 Impact Airbag Unit Module A0055421218

PLN 47.95

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Part no. A2059004721

Door Module W205 Rear Right O/S Door Control Unit Module A2059004721

PLN 66.95

Free delivery - Mon, Nov 24

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Part no. A2168204726

Mercedes W221 Bluetooth Control Module Mobile Phone Interface A2168204726

PLN 75.95

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Part no. A0009060226

Starter Mercedes Vito W447 Diesel OM622 Starter Motor A0009060226

PLN 237.95

Free delivery - Mon, Nov 24

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Part no. A2129009622

Mercedes W212 Fuse Box Relay Rear SAM Control Unit Module A2129009622

PLN 208.95

Free delivery - Mon, Nov 24

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Part no. A9066800214

Mercedes Sprinter W906 Radio Fan Adapter Cooling Control Unit Module A9066800214

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A0018275101

Mercedes W164 Tyre Pressure Sensor Rear Right Left Antenna Module A0018275101

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2389058501

Antenna Mercedes A205 Convertible Telephone Antenna Module A2389058501

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2045407435

Earth Ground Cable Mercedes W204 C207 W212 Line Strap Battery Lead A2045407435

PLN 104.95

Free delivery - Mon, Nov 24

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Part no. A0035420219-3

Mercedes W639 W906 Relay 5-Pin Control Unit 12A Blue A0035420219

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A2049013502

Mercedes W204 S204 Airbag Module Air Bag SRS Control Unit ECU A2049013502

PLN 56.95

Delivery - Mon, Nov 24

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Part no. A1765401602

Mercedes W176 Rear Bumper PDC Wiring Parking Sensor Loom Harness A1765401602

PLN 123.95

Free delivery - Mon, Nov 24

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Part no. A4479053905

Mercedes W447 Aerial Antenna Amplifier Control Unit Module A4479053905

PLN 142.95

Free delivery - Mon, Nov 24

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Part no. A2229001912

Mercedes W205 C253 Door Module Rear Left N/S Control Unit ECU A2229001912

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A2115458532

Mercedes W211 W219 Body Control Module Control Unit ECU A2115458532

PLN 75.95

Free delivery - Mon, Nov 24

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Part no. A0009052200

Windscreen Camera Mercedes W209 W212 W221 Front Control Unit Module A0009052200

PLN 61.95

Free delivery - Mon, Nov 24

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Part no. A1698208526

Mercedes-Benz A B Class W169 W245 Door Control Module Left Rear N/S A1698208526

PLN 47.95

Delivery - Mon, Nov 24

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Part no. A2319003706

Mercedes R231 Control Unit Module Passenger Seat A2319003706

PLN 522.95

Free delivery - Mon, Nov 24

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Part no. A2469055003-1

Ignition Switch Mercedes W167 W177 W247 Lock Control Unit Module A2469055003

PLN 189.95

Free delivery - Mon, Nov 24

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Part no. 13720856

Mercedes W212 Negative Cable Battery Terminal Wiring 13720856

PLN 61.95

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Part no. A2038700426

Door Module Mercedes CL203 Front Right O/S Control Unit A2038700426

PLN 132.95

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Part no. A0065424220

Mercedes W164 W251 High Tone Horn Signal Right O/S A0065424220

PLN 61.95

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Part no. A1765405608

Mercedes-Benz A-Class W176 Rear Right Door Wiring Cable A1765405608

PLN 42.95

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Part no. A0038202926

Mercedes W164 X164 W221 SRS Airbag Impact Crash Sensor A0038202926

PLN 42.95

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Part no. A1729017601

Mercedes SLK R172 Front Air Module SRS Control Unit ECU A1729017601

PLN 142.95

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Part no. A6401502579

Mercedes W169 200CDI OM640.941 140HP Engine Control Unit Module ECU A6401502579

PLN 569.95

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Part no. A2661536679-2

Mercedes W169 A170 M166.940 116HP Engine Unit Module ECU A2661536679 Automatic

PLN 237.95

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Part no. A1635409108

Mercedes-Benz M ML W163 Rear Window Heater Cable Harness Wiring A1635409108

PLN 42.95

Delivery - Mon, Nov 24

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Part no. A1665400841

Ground Line Mercedes ML W166 Battery Earth Negative Cable Wire A1665400841

PLN 75.95

Free delivery - Mon, Nov 24

If paid before 14:00

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Showing 1090-1188 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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