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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Part no. A2465401350

Fuse Box Mercedes W156 W176 W246 Front Relay Control Unit Module A2465401350

PLN 47.95

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If paid before 14:00

Part no. A9065410140

Mercedes-Benz Sprinter W906 Battery Tray Holder Mounting Bracket A9065410140

PLN 47.95

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Part no. A0035420219-2

Mercedes W639 W906 Relay 5-Pin Control Unit 12A Blue SET X2 A0035420219

PLN 94.95

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Part no. A2045458601

Mercedes W204 Fuse Box Rear Relay Control Unit Module SAM A2045458601

PLN 474.95

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Part no. A6461505072-1

Mercedes W211 E220 CDI 646.821 170HP Engine ECU Kit A6461505072 Ignition + Key

PLN 949.95

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Part no. A2661501233

Engine Wiring Mercedes W169 W245 M266 Petrol Cable Loom Harness A2661501233

PLN 474.95

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Part no. A2479007708

Rain Sensor Mercedes C118 W177 W247 Front Windscreen Light Unit A2479007708

PLN 61.95

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Part no. A6429004201

Mercedes W221 BlueTec Exhaust Gas Aftertreatment Control Unit Module A6429004201

PLN 569.95

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Part no. A0035453501

Mercedes Vaneo W414 Sprinter W901 W902 W903 Fuse Box Battery A0035453501

PLN 42.95

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Part no. A6519000700-3

Mercedes W906 310 CDI OM651.955 95HP Engine Unit ECU Kit A6519000700 Key Lock

PLN 1,519.95

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Part no. A2198200226

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

PLN 47.95

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Mercedes X218 CLS350 Automatic Trunk Lid Clossing Control Module A2189002002

PLN 142.95

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Part no. A0009067500

Alternator Generator Mercedes W204 W212 Diesel Engine Valeo 180A 14V A0009067500

PLN 379.95

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Part no. A2044401705

Mercedes S204 Door Wiring Loom Cable Rear Left Right N/O/S A2044401705

PLN 46.95

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Part no. A6519003701-2

Mercedes W212 Engine ECU Module Wiring Loom Harness Socket OM651 A6519003701

PLN 94.95

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

PLN 42.95

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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. A2129006709-1

Mercedes C207 W212 Head Unit High Line Radio Sat Nav DVD Bluetooth A2129006709

PLN 427.95

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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. A2189009003

Mercedes CLS C218 Front Headlight Xenon Ballast Control Module Unit A2189009003

PLN 237.95

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Part no. A2055450901

Mercedes C205 Cable Contact Guide Battery Clamp Unit A2055450901

PLN 189.95

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Part no. A2129004518

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

PLN 61.95

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Part no. A1779002510

Mercedes W177 W247 Safety Module Air Module SRS Control Unit ECU A1779002510

PLN 522.95

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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. A1635400734

Mercedes-Benz M ML W163 Rear Left Right Door Wiring Loom Harness A1635400734

PLN 47.95

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Part no. A2135400329

Mercedes X253 Electrical Wiring Harness Cable Hybrid A2135400329

PLN 379.95

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Part no. A2535400901

Starter Cable Mercedes W205 GLC X253 M274 Electrical Wiring Harness A2535400901

PLN 189.95

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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. A4145400130

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

PLN 47.95

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Part no. A9075406849

Mercedes Sprinter W907 Ground Line Battery Earth Cable Wire A9075406849

PLN 94.95

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Part no. A1715450901

Mercedes SLK R171 Front Fuse Box SAM Relay Control Unit Module A1715450901

PLN 1,234.95

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Part no. A2118701185

Air Module Mercedes W211 W219 Control Unit ECU A2118701185

PLN 85.95

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Part no. A2034404532

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

PLN 66.95

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Part no. A2129009622

Mercedes W212 Fuse Box Relay Rear SAM Control Unit Module A2129009622

PLN 208.95

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Part no. A6399003200

Mercedes Vito W639 Door Module Front Right O/S Control Unit ECU A6399003200

PLN 237.95

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Part no. A0009003505

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

PLN 85.95

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Part no. A2389007704

Communication Module Mercedes W205 W213 C253 Hermes LTE Control Unit A2389007704

PLN 379.95

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Part no. A6421509478

Mercedes ML W164 OM642 Diesel Engine Control Unit Module ECU A6421509478

PLN 759.95

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Part no. A2135452040

Mercedes W213 Head Unit Bracket Control Unit Module Holder Mount A2135452040

PLN 42.95

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Part no. A2128208726

Mercedes W212 Door Module Rear Left N/S Control Unit ECU A2128208726

PLN 75.95

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Part no. A4479053905

Mercedes W447 Aerial Antenna Amplifier Control Unit Module A4479053905

PLN 142.95

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Part no. A2129003922-1

Mercedes W212 Fuse Box Rear SAM Relay Control Unit Module A2129003922

PLN 170.95

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Part no. A2118705526

Mercedes W219 Motorola Telephone Control Module DC UHI MOST A2118705526

PLN 42.95

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Part no. A2124400706

Wiring Harness Mercedes W212 LED Lighting Air Nozzle Cable A2124400706

PLN 56.95

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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. A2465402050

Mercedes W176 Fuse Box Control Unit SAM Module Relay A2465402050

PLN 70.95

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Part no. A1179009200

Mercedes W176 Air Module Belts System Control Unit ECU Bosch A1179009200

PLN 237.95

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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. A1715405045-1

Mercedes SLK R171 Central Gateway Module ECU Control Unit A1715405045

PLN 61.95

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Part no. A2649001000

Mercedes W205 Petrol Engine Alternator Electrical Cable A2649001000

PLN 1,519.95

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Part no. A1645400624

Mercedes W164 Fuse Box Relay Housing Cover A1645400624

PLN 75.95

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Part no. A1779001203

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

PLN 61.95

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Part no. A6519007500-26

Mercedes W204 W212 C220CDI 170HP OM651.911 Engine Control ECU A6519007500 Manual

PLN 237.95

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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. A0009058100

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

PLN 42.95

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Part no. A2055403606

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

PLN 123.95

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Part no. A2229003210

Mercedes W205 Head Unit Audio Player Radio Sat Nav Module A2229003210

PLN 189.95

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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

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Part no. A2035407408

Mercedes-Benz C W203 Rear Left Right Door Wiring Loom Harness A2035407308

PLN 42.95

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Part no. A9075400500

Mercedes W907 Battery Cable Wiring Loom Harness Cabling A9075400500

PLN 113.95

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Part no. A2128201689

Mercedes W212 Antenna Amplifier Aerial Module Unit A2128201689

PLN 42.95

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Part no. A6519007401

Mercedes W212 E250CDI Blue Efficiency OM651 204HP Engine Module ECU A6519007401

PLN 379.95

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Part no. A9069000401

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

PLN 47.95

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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. A2118704126

Mercedes W221 Door Control Module Right Rear O/S A2118704126

PLN 94.95

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Part no. A4475400053

Mercedes Vito W447 Negative Battery Cable A4475400053

PLN 94.95

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Part no. A2059007123

Mercedes W176 W212 W246 Telematics Communication Control Unit Module A2059007123

PLN 42.95

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Part no. A6511501879

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

PLN 474.95

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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. A6519007401-6

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

PLN 807.95

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Part no. A2059004721

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

PLN 66.95

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Part no. A6399003701

Mercedes W639 Tire Tyre Pressure Control Module Unit A6399003701

PLN 474.95

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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. A0009822923-1

Mercedes W177 W205 W247 Relay Fuse Unit Module 4 Pins Grey SET X2 A0009822923

PLN 75.95

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Part no. A0018275101

Mercedes W164 Tyre Pressure Sensor Rear Right Left Antenna Module A0018275101

PLN 61.95

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Part no. A2389058501

Antenna Mercedes A205 Convertible Telephone Antenna Module A2389058501

PLN 142.95

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Part no. A6402002770-1

Alternator Belt Tensioner Mercedes W169 W245 OM640 Diesel Holder Mounting Panel

PLN 112.95

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Part no. A0005459812

Mercedes Vito W447 W213 OM654 Power Distribution Relay Unit Module A0005459812

PLN 113.95

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Part no. A4475400010

Mercedes Vito W447 Battery Cable Alternator Wiring Diesel OM651 A4475400010

PLN 123.95

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Part no. A1779061302

Mercedes EQA H243 W247 Fuse Box Relay Control Unit Module A1779061302

PLN 284.95

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Part no. A2059008826

Mercedes C205 SAM Module Rear Comfort Control Unit ECU A2059008826

PLN 132.95

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Part no. A2218705089

Mercedes W221 Audio Amplifier Sound Harman Becker Control Unit A2218705089

PLN 4,084.95

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Part no. A6394405109

Mercedes Vito W639 Wiring Harness Rear Boot Trunk Lid Tailgate Loom A6394405109

PLN 142.95

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Part no. A2135401217

Mercedes W213 OM642 Diesel Engine Alternator Wiring Loom Harness A2135401217

PLN 189.95

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Part no. A0038208426

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

PLN 42.95

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Part no. A0038206326

Mercedes W221 Door Module Front Door Left N/S Control Module A0038206326

PLN 75.95

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Part no. A0009061004

Mercedes W213 C238 C257 Parking Brake Actuator Motor A0009061004

PLN 237.95

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Mercedes Sprinter W910 Battery Sensor Negative Terminal Cable Wiring A2135409616

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

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Door Module Mercedes C118 W177 H243 Front Right O/S Door Control A1779005409

PLN 284.95

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Part no. A2055401604

Mercedes W205 Battery Cable Wiring Harness Loom Petrol Hybrid A2055401604

PLN 100.95

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Mercedes Sprinter W907 W910 Air Module Sensor Unit ECU A9079000304

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Mercedes Sprinter W907 W910 Air Module Sensor Unit ECU A9079000304

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Part no. A2711501920

Engine Wiring Mercedes W204 C207 W212 M271 Harness Loom Cable A2711501920

PLN 474.95

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Part no. A2218208202

Mercedes W221 Front Centre Dashboard Tweeter Speaker A2218208202

PLN 61.95

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Part no. A0038207726

Mercedes W212 Siren Alarm Horn Signal Module Unit A0038207726

PLN 42.95

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Part no. A1645453716

Mercedes ML W164 Parking Module PDC Distance Control Unit Sensor A1645453716

PLN 75.95

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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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...

Showing 793-891 of 3212 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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