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. A1718201726

Mercedes SLK R171 Seat Heated Heating Control Unit Module ECU A1718201726

PLN 103.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A1765400103

Battery Cable Mercedes C117 W176 Starter Alternator Wiring Harness A1765400103

PLN 322.95

Free delivery - Tue, Jan 13

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Part no. 390203254

Seat Adjustment Motor Mercedes R171 W221 Front Seat Motor Actuator 0390203254

PLN 56.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. A1715450701

Mercedes SLK R171 Rear SAM Control Unit Module Relay Fuse Box A1715450701

PLN 427.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A2059007134

Mercedes C205 Sam Control Module Body Comfort ECU A2059007134

PLN 237.95

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Part no. A1695407405

Mercedes W169 Wiring Loom Cable Door Front Left Right N/O/S A1695407405

PLN 61.95

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Part no. A2469004519

Gearbox Module Mercedes W176 W246 Control Unit ECU Automatic A2469004519

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. A6081550035

Mercedes W177 Alternator Mounting Bracket Carrier A6081550035

PLN 284.95

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Part no. A2661503133

Engine Wiring Mercedes W169 W245 M266 Petrol Cable Loom Harness A2661503133

PLN 474.95

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Part no. A1699000200

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

PLN 65.95

Free delivery - Tue, Jan 13

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Part no. A2139003208

Mercedes W213 SAM Module Rear Body Comfort Control Unit ECU A2139003208

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. A1669005417

Mercedes X117 Communication Telematics Control Module Unit ECU A1669005417

PLN 94.95

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Part no. A4478260000

Mercedes Vito W447 Headlight Turn Indicator Light Socket Plug A4478260000

PLN 61.95

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Part no. A6401501933

Engine Wiring Mercedes W169 W245 OM640 Cable Loom Harness A6401501933

PLN 142.95

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Part no. A0009001704

Fuel Pump Module Mercedes W176 W204 C207 W212 W246 Control Unit ECU A0009001704

PLN 265.95

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Part no. A2189058500

Mercedes CLS X218 Antenna Amplifier Rear Aerial Control Module A2189058500

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A1775401758

Mercedes W118 W177 W247 Starter Alternator Wiring Loom Harness Cable A1775401758

PLN 341.95

Free delivery - Tue, Jan 13

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Part no. A0015456403

Mercedes Sprinter W906 Fuse Box Relay Cover Box Cap A0015456403

PLN 42.95

Delivery - Tue, Jan 13

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Part no. A6519000601-1

Mercedes W906 313 CDI 651.955 129HP Diesel Engine ECU Key Lock Kit A6519000601

PLN 1,234.95

Free delivery - Tue, Jan 13

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Part no. A2049006003

Radio Player Mercedes W204 Audio 20 Navi CD Player Head Unit A2049006003

PLN 902.95

Free delivery - Tue, Jan 13

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Part no. A2709000900-7

Mercedes W246 B180 270.910 122HP BlueEffi Engine ECU A2709000900 Automatic

PLN 1,329.95

Free delivery - Tue, Jan 13

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Part no. A2129005327

Radio Head Unit Mercedes W212 COMAND Navi CD DVD Player Changer A2129005327

PLN 1,139.95

Free delivery - Tue, Jan 13

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Part no. A2469006816

Mercedes W176 W231 W246 Electric Parking Brake Control Unit Module A2469006816

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. A2229002009

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

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A2105460141

Mercedes-Benz E-Class W210 Battery Cable Box Connector Petrol A2105460141

PLN 27.95

Delivery - Tue, Jan 13

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Part no. A0009057302

Windscreen Camera Mercedes W204 W212 Front Windshield Camera Unit A0009057302

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A1779002207

Mercedes W177 Rear Left Right N/O/S Door Control Module A1779002207

PLN 142.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A1648205389

Mercedes ML W164 Aerial Antenna Amplifier Unit Module A1648205389

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A0005406904

Mercedes X253 Ground Line Battery Earth Cable Wire A0005406904

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A2055404797

Battery Cable Mercedes GLC X253 Starter Motor Alternator Wiring A2055404797

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. A2515400524

Mercedes W251 Fuse Relay Electrical Box Housing Cover A2515400524

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A2129060205

SAM Module Mercedes W207 A207 C207 Rear Control Unit ECU A2129060205

PLN 427.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A9078209600

Mercedes W907 L2H2 Electric Radio Player Head Unit A9078209600

PLN 474.95

Free delivery - Tue, Jan 13

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Part no. A1775404007

Fuse Box Mercedes W177 Power Distribution Junction Relay Unit A1775404007

PLN 218.95

Free delivery - Tue, Jan 13

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Part no. A2115460580

Wiring Holder Mercedes W211 Cable Loom Harness Cover Channel A2115460580

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A6569000200-1

Mercedes W213 E400d OM656.929 Diesel Engine ECU Kit A6569000200 Automatic

PLN 2,279.95

Free delivery - Tue, Jan 13

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Part no. A1775401731

Mercedes W177 M282 Wiring Harness Battery Starter Motor Alternator A1775401731

PLN 284.95

Free delivery - Tue, Jan 13

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Part no. A2129004025

Mercedes W212 Fuse Box Relay Control Unit Module SAM A2129004025

PLN 474.95

Free delivery - Tue, Jan 13

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Part no. A1729009302

Mercedes W212 W221 Media Interface Control Unit Module A1729009302

PLN 61.95

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Part no. A2118203375

Antenna Booster Mercedes W211 Rear Boot Lid Tailgate Amplifier A2118203375

PLN 47.95

Delivery - Tue, Jan 13

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Part no. A2479008607

SAM Module Mercedes W177 W247 Front SAM Body Comfort Control Unit A2479008607

PLN 379.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A2218702086

Mercedes W221 Rear Seat Control Module Unit ECU A2218702086

PLN 85.95

Free delivery - Tue, Jan 13

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Part no. A1775403131

Mercedes w177 Sensor Wiring Harness Cable Front A1775403131

PLN 123.95

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Part no. A0035421019-1

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

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A1695453740

Mercedes-Benz A-Class W169 Fuse Box Unit Holder Bracket Frame A1695453740

PLN 47.95

Delivery - Tue, Jan 13

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Part no. A2129009908

Mercedes SLK R172 Fuse Box Relay Control Unit SAM Module A2129009908

PLN 474.95

Free delivery - Tue, Jan 13

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Part no. A0009052200

Windscreen Camera Mercedes W209 W212 W221 Front Control Unit Module A0009052200

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A2218708326

Mercedes W221 Rear View Backup Camera Control Unit Module A2218708326

PLN 208.95

Free delivery - Tue, Jan 13

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Part no. A2125406905

Mercedes W212 Door Wire Wiring Loom Front Left N/S A2125406905

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A0065454601

Energy Distributor Mercedes W204 OM656 Power Control Unit Module A0065454601

PLN 189.95

Free delivery - Tue, Jan 13

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Part no. A2469003615

Mercedes GLA X156 Tailgate Lift Boot Lid Control Unit Module A2469003615

PLN 284.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A6519007600-5

Mercedes W176 A180 CDI OM651.901 109HP Engine Unit ECU Kit A6519007600 Automatic

PLN 902.95

Free delivery - Tue, Jan 13

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Part no. A4155404305

Microphone Cable Mercedes Citan W415 Wiring Loom Cable Harness 27083202

PLN 85.95

Free delivery - Tue, Jan 13

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Part no. A1698207426

Mercedes-Benz A B Class W169 W245 Door Control Unit Right O/S Rear A1698207426

PLN 47.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. A2218707526

Mercedes W221 Air Module Control Unit ECU SRS Module A2218707526

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A0045425218

Mercedes W221 Blind Spot Radar Sensor Module Control Unit A0045425218

PLN 949.95

Free delivery - Tue, Jan 13

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Part no. A2128270228-SEL

Mercedes W212 Roof Antenna Amplifier Shark Selenite Grey - 992 A2128270228

PLN 85.95

Free delivery - Tue, Jan 13

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Part no. A2711535391-2

Mercedes R171 SLK 200K 184HP M271.944 Engine ECU Kit A2711535391 Key Lock

PLN 1,044.95

Free delivery - Tue, Jan 13

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Part no. A1669006507

Door Module Mercedes ML W166 C292 Rear Right O/S Door Control Unit A1669006507

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A6394460132

Mercedes Vito Viano W639 Side Sliding Door Control Unit Module A6394460132

PLN 949.95

Free delivery - Tue, Jan 13

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Part no. A6541400155

Mercedes-Benz W213 Genuine Gas Filter Pressure Line Sensor Dpf A6541400155

PLN 85.95

Free delivery - Tue, Jan 13

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Part no. A2059068501-1

Fuse Box Mercedes W205 S205 W213 Fuse Box Front Relay Control Module A2059068501

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A2539000100

Rain Light Sensor Mercedes X253 Windschield Sensor Module Unit A2539000100

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. A2709002100-9

Mercedes W176 A160 W246 B160 270.910 102HP Engine ECU Unit A2709002100 Manual

PLN 522.95

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Part no. A2048706826

Mercedes W204 ECU Control Unit Sensor Module Airbag A2048706826

PLN 61.95

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Part no. A2319058100

Mercedes SLK R172 Roadster Antenna Amplifier Control Module A2/71 A2319058100

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A1179001801

Mercedes W176 Air Module System Control Unit Module ECU A1179001801

PLN 284.95

Free delivery - Tue, Jan 13

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Part no. A6519007500-7

Mercedes A207 C207 E220 CDI 651.911 BE Engine ECU Kit Ignition + Key A6519007500

PLN 617.95

Free delivery - Tue, Jan 13

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Part no. A2761508800

Starter Cover Mercedes W205 W212 W213 M276 Heat Plate Motor Shield A2761508800

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A2475451000

Mercedes W177 W247 Battery Bracket Battery Mount Holder Trim A2475451000

PLN 47.95

Delivery - Tue, Jan 13

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Part no. A1698209926

Mercedes W169 W245 ECU Air Control Unit Sensor Module A1698209926

PLN 75.95

Free delivery - Tue, Jan 13

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Part no. A2048708026

Mercedes W204 Media Interface Control Unit Module ECU A2048708026

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A2059002922

Door Module Mercedes W205 W253 C253 Front Left N/S Control Unit ECU A2059002922

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A6071550335

Alternator Belt Tensioner Mercedes W176 OM607 Diesel Holder Mounting Panel

PLN 113.95

Free delivery - Tue, Jan 13

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Part no. A1569007702

Signal Actuation Module Mercedes W176 W246 SAM Control Unit ECU A1569007702

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A2465402705

Mercedes W176 Door Harness Loom Cable Wiring Front Left Right N/O/S A2465402705

PLN 75.95

Free delivery - Tue, Jan 13

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Part no. A2135451140

ECU Bracket Mercedes W213 Control Unit Module Holder Mount A2135451140

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. A1665400141

Mercedes W166 Petrol Engine HV Battery Earth Ground Line Cable Wire A1665400141

PLN 123.95

Free delivery - Tue, Jan 13

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Part no. A2218702286

Mercedes W221 Front Seat Heater Control Unit Module ECU A2218702286

PLN 123.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A2188201926

Mercedes CLS C218 Bi-Xenon Headlight Ballast Module Control Unit A2188201926

PLN 332.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A2218708992

Mercedes W221 C216 Telephone Bluetooth Connection Control Module A2218708992

PLN 42.95

Delivery - Tue, Jan 13

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Part no. A2118705726

Air Module Mercedes W211 C219 Air System Control Unit ECU A2118705726

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A1765405608

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

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. A2135407744

Mercedes W213 Door Ambient Light Cable Harness Wiring Rear Right O/S A2135407744

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A2465400512

Seat Wiring Mercedes C117 Front Seat Left Wiring Harness a2465400512

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. A2139065706

Mercedes W205 W213 Front Engine Compatment Fuse Relay Box Module A2139065706

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A1729007600

Seat Module Mercedes W204 Front Right O/S Memory Control Unit A1729007600

PLN 237.95

Free delivery - Tue, Jan 13

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Part no. A2469000005

Mercedes W176 PDC Parking Distance Control Module Unit A2469000005

PLN 284.95

Free delivery - Tue, Jan 13

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Part no. A1635409108

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

PLN 42.95

Delivery - Tue, Jan 13

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Part no. A2049009301

Mercedes W212 Media Interface Control Unit Module Multimedia A2049009301

PLN 104.95

Free delivery - Tue, Jan 13

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Part no. A9078200301

Mercedes W907 Radio Professional System Controller Head Unit A9078200301

PLN 569.95

Free delivery - Tue, Jan 13

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Part no. A0015467435

Battery Cover Mercedes W906 Battery Positive Pole Cover Red A0015467435

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. A1695451440

Mercedes W169 W245 Central Gateway Module Bracket Holder Mount A1695451440

PLN 42.95

Delivery - Tue, Jan 13

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Part no. A1669003602

Mercedes W204 R172 DAB Receiver Digital Audio Control Unit Module A1669003602

PLN 379.95

Free delivery - Tue, Jan 13

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Part no. A1679001420

Central Locking Module Mercedes C118 W177 Door Lock Control Unit A1679001420

PLN 379.95

Free delivery - Tue, Jan 13

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Part no. A1669008009

Mercedes GLE W166 Rear Door Wiring Control Module Right O/S Unit ECU A1669008009

PLN 165.95

Free delivery - Tue, Jan 13

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Part no. A1775408609

Door Wiring Mercedes W177 W247 Front Passenger Side Cable Harness A1775408609

PLN 66.95

Free delivery - Tue, Jan 13

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Part no. A1776203400

Mercedes W177 W247 Battery Bracket Mount Holder Support A1776265300

PLN 56.95

Delivery - Tue, Jan 13

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Part no. A4475401440

Mercedes Vito W447 Fuse Box Relay Control Unit Module A4475401440

PLN 237.95

Free delivery - Tue, Jan 13

If paid before 14:00

...

Showing 1288-1386 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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