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. A0005457616

Mercedes R171 VDO Transmission Control Unit Module EGS A0005457616

PLN 379.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A1179008700

Mercedes GLA X156 Air Module Safety Belt Tensioner Unit Control A1179008700

PLN 379.95

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Part no. A9079002407

Mercedes W907 Electronic Ignition Module Control Unit A9079002407

PLN 607.95

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Part no. A2128203589

Antenna Amplifier Mercedes W212 Aerial Module Rear Roof Frame Right A2128203589

PLN 42.95

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Part no. A1779069601

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

PLN 189.95

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Part no. A2513200158

Mercedes W251 W906 Valve Block Air Suspension Control Unit Module A2513200158

PLN 189.95

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Part no. A2469008516

Parking Brake Module Mercedes W176 W246 Electric Control Unit ECU A2469008516

PLN 66.95

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Part no. A2034450000

Mercedes Vito W639 Gateway Control Unit Module A2034450000

PLN 42.95

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Part no. A2049005503

Mercedes C207 Complete Damper Adjustment Control Module ECU A2049005503

PLN 284.95

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Part no. A1779008511

Door Module Mercedes W177 W247 Rear Left Right N/O/S Control Unit A1779008511

PLN 170.95

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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. A2711504733

Mercedes W204 Injection Electrical Wiring M271 Petrol Engine Cable A2711504733

PLN 56.95

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Part no. A2466200028

Mercedes W176 Battery Support Holder Bracket Mount A2466200028

PLN 42.95

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Part no. A4709820700

Mercedes W470 Glow Plug Relay Module Unit A4709820700

PLN 94.95

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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. A1699000100

Mercedes-Benz A B W169 W245 Front Left Door N/S Control Unit Module A1699000100

PLN 66.95

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Part no. A6519007500-4

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

PLN 246.95

Free delivery - Tue, Jan 13

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Part no. A1725403405

Mercedes R172 OM651 Diesel Alternator Wiring Harness Cable Loom A1725403405

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A1725401450

Mercedes SLK R172 Fuse Box Power Distribution Control Module Unit A1725401450

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A2059009230

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

PLN 75.95

Free delivery - Tue, Jan 13

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Part no. A6461505091-2

Mercedes W203 C220 CDI 150HP 646.963 Engine Control ECU Kit A6461505091 Automat

PLN 854.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A1698207526

Mercedes-Benz A B Class W169 W245 Door Control Unit Left N/S Rear A1698207526

PLN 47.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. A2909003001-1

Mercedes C238 Transfer Case Torque Distribution Control ECU E53 4matic

PLN 949.95

Free delivery - Tue, Jan 13

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Part no. A2058200704

Sunroof Wiring Mercedes W205 X253 Panoramic Roof Motor Cable Harness A2058200704

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A2059007218-2

Mercedes GLC X253 Rear Trunk Lid Automatic Closing Lock Mechanism A2059007218

PLN 61.95

Free delivery - Tue, Jan 13

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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 - Tue, Jan 13

If paid before 14:00

Part no. A2055406304

Mercedes W205 Hybrid Battery Cable Starter Wiring Loom Harness A2055406304

PLN 113.95

Free delivery - Tue, Jan 13

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Part no. A2229063202-1

Fuse Box Mercedes W205 W222 Electrical Relay Box Module Unit A2229063202

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A2439008400

Mercedes GLC X253 Sound Audio Amplifier Module Rear Harman A2439008400

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. A0065424220

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

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A0015453916

Mercedes CL 203 Automatic Gearbox Control Unit Module ECU A0015453916

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A2049009004

Parking Module Mercedes W204 S204 PDC Distance Control Unit Sensor A2049009004

PLN 42.95

Delivery - Tue, Jan 13

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Part no. A2075400740

Fuse Box Mercedes W204 Battery Terminal Control Unit Module A2075400740

PLN 75.95

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Part no. A2078200075

Antenna Mercedes W212 Keyless Go Comfort Access Antenna Module Unit A2078200075

PLN 47.95

Delivery - Tue, Jan 13

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Part no. A2059054415

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

PLN 332.95

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Part no. A2045406662

Mercedes-Benz C W204 PDC Parking Sensor Distance Control Module A2045406662

PLN 42.95

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Part no. A0035420219-1

Relay Mercedes W639 W906 5-Pin Black 12V 20A A0035420219 Set X2

PLN 94.95

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Part no. A9066800214

Mercedes Sprinter W906 Radio Fan Adapter Cooling Control Unit Module A9066800214

PLN 42.95

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Part no. A2059003740

Mercedes A205 Convertible Comfort Control Unit Module A2059003740

PLN 393.95

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Part no. A1765401602

Mercedes W176 Rear Bumper PDC Wiring Parking Sensor Loom Harness A1765401602

PLN 123.95

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Part no. A1765450000

Mercedes-Benz A-Class W176 Bluetooth Unit Module Bracket Holder A1765450000

PLN 42.95

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Part no. A1779009902

Mercedes W177 Front Windscreen Windshield Camera Multi Purpose Unit A1779009902

PLN 275.95

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Part no. A2469064201

Antenna Amplifier Mercedes X117 W176 W205 Rear Aerial Module A2469064201

PLN 127.95

Free delivery - Tue, Jan 13

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Part no. A2469008115

Mercedes W176 W246 Gearbox Transfer Case Control Module Unit ECU A2469008115

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A0025450601

Mercedes W906 Fuse Relay Box Module Control Unit A0025450601

PLN 123.95

Free delivery - Tue, Jan 13

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Part no. A2079001200

Door Module Mercedes C207 W207 Front Right O/S Control Unit ECU A2079001200

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A2218705687

Mercedes W221 Linguatronic Control Module Unit ECU English Version A2218705687

PLN 360.95

Free delivery - Tue, Jan 13

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Part no. A6395406509

Wiring Loom Mercedes W639 Vito Cable Door Wiring Cable A6395406509

PLN 42.95

Delivery - Tue, Jan 13

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Part no. A1775408101

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

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. A2215404062

Mercedes W221 Air Suspension Control Unit Module Airmatic A2215404062

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A2048700185

Mercedes W204 Bluetooth Control Unit Module Media Interface ECU A2048700185

PLN 379.95

Free delivery - Tue, Jan 13

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Part no. A2055408104

Battery Cable Mercedes W205 X253 Diesel OM651 Alternator Wiring A2055408104

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A2055463100

Retaining Plate Mercedes W205 Relay Fuse Box Holder Bracket A2055463100

PLN 85.95

Free delivery - Tue, Jan 13

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Part no. A2038700426

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

PLN 132.95

Free delivery - Tue, Jan 13

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Part no. A2469000012-2

Mercedes W176 W246 Radio Head Unit COMAND Navi Player Control Unit A2469000012

PLN 712.95

Free delivery - Tue, Jan 13

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Part no. A0055422618

Rate Sensor Mercedes W212 ESP Yaw Rotation Control Unit Module A0055422618

PLN 46.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. A2518204426

Mercedes V251 W164 Front Lamp Headlight Control Module Unit HELLA A2518204426

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. A2479009312

Mercedes W910 Telematics Module Communication Blutooth Control A2479009312

PLN 341.95

Free delivery - Tue, Jan 13

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Part no. A2048701126

Mercedes S204 Door Module Rear Left N/S Control Unit ECU A2048701126

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A2055401900

Mercedes W205 Parking Sensor Wiring Rear Bumper PDC Loom Cable A2055401900

PLN 237.95

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Part no. A2056186100

Mercedes W205 W238 Rear Battery Holder Bracket Mount Strap Clamp A2056186100

PLN 42.95

Delivery - Tue, Jan 13

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Part no. A1697220180

Mercedes-Benz A-Class W169 Door Plug Cover Trim Insert Blank Seal A1697220180

PLN 46.95

Delivery - Tue, Jan 13

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Part no. A2098209810

Mercedes CLK A209 Cabrio Alarm Anti Theft System Control Module Unit A2098209810

PLN 80.95

Free delivery - Tue, Jan 13

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Part no. A1779006715

Mercedes W177 Wireless Charger Centre Console Phone Charging Module A1779006715

PLN 379.95

Free delivery - Tue, Jan 13

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Part no. A2135409916

Earth Ground Cable Mercedes W213 S213 Battery Wiring Loom Engine A2135409916

PLN 85.95

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Part no. A2129000004

SAM Module Mercedes W212 Fuse Box Relay Control Unit A2129000004

PLN 42.95

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Part no. A6519062300

Starter Motor Mercedes W204 W212 OM651 Diesel Engine Starter A6519062300

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A0005456616

Mercedes W212 Automatic Gearbox EGS Control Module Unit ECU A0005456616

PLN 61.95

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Part no. A0009006516

Bluetooth Module Mercedes S205 W205 W177 Active Parking Assist Control Rear

PLN 474.95

Free delivery - Tue, Jan 13

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Part no. A2128208826

Mercedes W212 Door Control Module Unit ECU Rear Right O/S A2128208826

PLN 61.95

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Part no. A0009062103

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

PLN 474.95

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Part no. A2721503933

Engine Wiring Mercedes C209 272960 Petrol Module Loom Harness Cables A2721503933

PLN 256.95

Free delivery - Tue, Jan 13

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Part no. A2139004709

Mercedes W213 Door Module Rear Left N/S Control Unit A2139004709

PLN 123.95

Free delivery - Tue, Jan 13

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Part no. A2479052503

Mercedes Sprinter W910 Remote Key Control Unit A2479052503

PLN 284.95

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Part no. A2044406135

Mercedes W204 Door Harness Loom Cable Wiring Rear Right O/S A2044406135

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A1636801080-1

Mercedes-Benz M-Class ML W163 1 Cover Footwell Fuse Box Trim Right A1636801080

PLN 65.95

Free delivery - Tue, Jan 13

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Part no. A2078201989

Mercedes-Benz W207 A207 Radio Aerial Antenna Amplifier Module Unit A2078201989

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A2139005311

Mercedes W213 Head Unit CD Media Player Audio Auto Radio Controller A2139005311

PLN 712.95

Free delivery - Tue, Jan 13

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Part no. A2229005315

Bluetooth Module Mercedes W176 W205 Multimedia Control Unit ECU A2229005315

PLN 113.95

Free delivery - Tue, Jan 13

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Part no. A2059000219

Mercedes C117 W176 W205 Telematics Module Communication Control Unit A2059000219

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A2036901430

Mercedes C CLC Class CL203 W203 Rear SAM Unit Fuse Box Trim Cover A2036901430

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. A2135403839

Mercedes W213 C238 Power Relay Fuse Box Unit Cover A2135403839

PLN 237.95

Free delivery - Tue, Jan 13

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Part no. A2719000700

Mercedes R171 SLK200 Kompressor M271.954 Engine Control Unit ECU A2719000700

PLN 474.95

Free delivery - Tue, Jan 13

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Part no. A2049009410

Mercedes W204 CD Player Radio Stereo Navigation Sat Nav Head Unit A2049009410

PLN 237.95

Free delivery - Tue, Jan 13

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Part no. A2229005415

Mercedes W205 W213 W222 Comunication Module Telematic Bluetooth A2229005415

PLN 284.95

Free delivery - Tue, Jan 13

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Part no. A1779008103

Mercedes W177 W247 Telematics Module Communication Control Unit A1779008103

PLN 189.95

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Part no. A6397600340

Mercedes Vito W639 Door Handle Cable Catch Bowden Cable Rear A6397600340

PLN 94.95

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Part no. A1775409357

Mercedes W177 M282 Starter Alternator Electrical Wiring Harness A1775409357

PLN 94.95

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Part no. A2059067200-1

Mercedes W205 S205 W213 Fuse Box Front Relay Control Unit Module A2059067200

PLN 47.95

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Part no. A0009006102

Mercedes Vito W639 ECU Control Unit Crash Impact Module Air Module A0009006102

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. A2709002100-15

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

PLN 1,899.95

Free delivery - Tue, Jan 13

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Part no. 13720856

Mercedes W212 Negative Cable Battery Terminal Wiring 13720856

PLN 61.95

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Part no. A1679004712

Bluetooth Module Mercedes W205 W213 W222 W238 Control Unit ECU A1679004712

PLN 94.95

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Part no. A1775405520

Mercedes W177 Front Door Harness Loom Cable Wiring Left Right N/O/S A1775405520

PLN 237.95

Free delivery - Tue, Jan 13

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Part no. A2055457200

Mercedes W205 Radio Stereo Head Unit Mount Bracket Holder Support A2055457200

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A9079005303

Mercedes Sprinter W907 W910 Control Unit Module ECU A9079005303

PLN 379.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A2219005503

Mercedes W221 Air Suspension Module Regulation Control Unit A2219005503

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A1779000304

Airbag Module Mercedes V177 W177 C118 Air Bag SRS Control Unit ECU A1779000304

PLN 51.95

Delivery - Tue, Jan 13

If paid before 14:00

...

Showing 991-1089 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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