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. 9340522

BMW 5 F10 LCI Central Gateway Module ECU Control Unit LEAR ZGW-02 4SK 9340522

€66.95

Free delivery: Mar 10 – 13

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Part no. 8K0907551-1

Audi S4 B8 3.0 TFSI 333HP CAKA Quattro Engine ECU Kit 8K0907551 Automatic

€246.95

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Part no. 1S0919275D-TOG

Audi Q3 8U PDC Parking Distance Control Sensor Tornado Grey-X7P 1S0919275D

€23.95

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Part no. A1679008406

Mercedes W167 W177 W247 Ignition Engine Control Unit Module A1679008406

€170.95

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Part no. 8679817

BMW F98 Earth Ground Cable Negative Battery Lead Wiring 8679817

€23.95

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Part no. A0055422018

ESP Sensor Mercedes W164 W221 Yaw Rotation Rate Sensor A0055422018

€23.95

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Part no. A0131549002

Alternator Generator Mercedes W204 W211 OM646 Diesel Bosch 180A A0131549002

€66.95

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Part no. A2465407932

Battery Starter Wiring Mercedes W176 W246 Harness Cable Positive A2465407932

€142.95

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Part no. A0015426519

Mercedes C140 Brake Pump Relay Electrical Fuse Module Control Unit A0015426519

€23.95

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VW Volkswagen Touareg 7L Front Frame Panel Wiring Harness Cable 7L6971073F

€32.95

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Part no. 9259469

BMW X3 F25 Fuse Box Power Distribution Control Unit Module Rear 9259469

€32.95

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Part no. 9230680

BMW Mini Cooper One R55 R56 R57 CD Changer 6 Disc Player 9167081

€70.95

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Part no. 8F0971030AM

Audi A5 8T Front Door Electric Wiring Loom Harness Passenger's Side 8F0971030AM

€42.95

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Part no. 9218261

Mini Clubman R55 Clubdoor Cable Wiring Loom Harness Set 9154133

€23.95

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Part no. 9270495

BMW X5 X6 5 6 Series E70 E71 F10 F11 F12 PDC Ultrasonic Sensor Black 9270495

€23.95

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Part no. 7LA971793B

Volkswagen Transporter T6 Battery Earth Cable Line 7LA971793B

€23.95

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Part no. A2055400292

Mercedes W205 Door Wiring Harness Door Control Loom Front Right O/S A2055400292

€51.95

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Part no. 8Y4971104BK

Audi S3 8Y Rear Bumper Wiring Harness Cable Loom 8Y4971104BK

€70.95

Free delivery: Mar 10 – 13

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Part no. 9214812

BMW E88 E93 LCI Air Module Control Unit ECU 9214812

€28.95

Free delivery: Mar 10 – 13

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Part no. FK72-19H440-BH

Land Rover Discovery Sport L550 Keyless Module Control Unit FK72-19H440-BH

€56.95

Free delivery: Mar 10 – 13

If paid before 14:00

Part no. EJ32-14D617-AA

Range Rover L538 Front Door Control Unit Module Passenger Side EJ32-14D617-AA

€23.95

Free delivery: Mar 10 – 13

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Part no. AH42-15K609-AC

Land Rover Discovery 4 L319 Interior Ultrasonic Alarm Sensor Panel AH4215K609AC

€28.95

Free delivery: Mar 10 – 13

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Part no. A2129004014

Mercedes W204 W212 Front Door Module Control Unit Module Left N/S A2129004014

€23.95

Free delivery: Mar 10 – 13

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Part no. 8369504

BMW 5 E39 Saloon Radio Signal Antenna Amplifier Coaxial Cable 8369504

€23.95

Free delivery: Mar 10 – 13

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Part no. 7L0937576

Porsche Cayenne 9PA Fuse Box Relay Trim Cover Panel Unit Housing 7L0937576

€23.95

Free delivery: Mar 10 – 13

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Part no. A1695450140

Mercedes A B Class W169 W245 Holder Bracket Engine Control Unit A1695450140

€23.95

Free delivery: Mar 10 – 13

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Part no. 7L0907383G

Porsche Cayenne 9PA Tow Bar Trailer Towing Control Module Unit 7L0907383G

€165.95

Free delivery: Mar 10 – 13

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Part no. 9380323

BMW 5 Series F10 Steering Column Module Electronic Control Unit ECU 9380323

€66.95

Free delivery: Mar 10 – 13

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Part no. A1728202989

Mercedes SLK R172 Roadster Antenna Amplifier Control Module A1728202989

€28.95

Free delivery: Mar 10 – 13

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Part no. A6519007500-11

Mercedes W204 C 200 CDI 651.913 136HP Engine Unit ECU Kit A6519007500 Key Lock

€170.95

Free delivery: Mar 10 – 13

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Part no. 8X0959793B

Audi A1 8X Door Module Control Unit Controller Front Driver's Side 8X0959793B

€23.95

Free delivery: Mar 10 – 13

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Part no. 3454346

Mini Cooper One R55 R56 R58 R60 R61 Airbag ECU Control Module 3454346

€23.95

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Part no. 9290804

BMW F20 F22 F30 F32 Module ECU Control Unit FEM Fuse Box 9290804

€227.95

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Part no. A0025429319

Mercedes C117 W166 W176 W205 X253 Relay Black Control Unit 4 Pin 12V A0025429319

€23.95

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Part no. 6963014

BMW E60 E61 E63 Passenger Side Door Air Module Control Unit ECU 6963014

€23.95

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Part no. A2709060026

Starter Motor Mercedes W176 W246 Engine Starter Unit 12V Denso A2709060026

€28.95

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Part no. 4H0951253C

Seat Skoda Audi VW Polo 6R Multi Use Control Module Relay 4 Pin 646 4H0951253C

€23.95

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Part no. 9162930-WB

BMW E81 E82 E87 E90 E91 Parking Sensor PDC Ultrasonic Bluewater - 896

€23.95

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Part no. 6910542-1

BMW E46 X3 E83 Battery Cable Plus Pole Power Positive Wiring 6910542

€23.95

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Part no. 4G0937517

Audi A6 C7 Fuse Battery Junction Box Fuse Distribution Terminal Centre 4G0937517

€23.95

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Part no. A2168204726

Mercedes W221 Bluetooth Control Module Mobile Phone Interface A2168204726

€23.95

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Part no. 7555188

BMW 5 6 Series F10 F11 F12 F13 Control Unit Box Cover 7555155

€23.95

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Part no. 6809052

BMW F20 F21 F30 F31 F32 Rear Body Control Unit Module REM 6809052

€28.95

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Part no. A2139004119

Module Mercedes W205 Drivetrain Gearbox Control Module Unit A2139004119

€104.95

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Part no. 8W5035021

Audi A4 B9 Multimedia MMI Radio SD Player Stereo Sat Nav Head Unit 8W5035021

€659.95

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Part no. 4G8959792A

AUDI A7 4G8 Door Control Module Front Right O/S Passenger Side 4G8959792A

€23.95

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Part no. E1BT-18C815-HK

Ford Fiesta Mk7 Radio Stereo CD Player Head Unit Multimedia E1BT-18C815-HK

€32.95

Free delivery: Mar 10 – 13

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Part no. A2055402992

Mercedes W205 Parking Sensor Wiring Rear Bumper PDC Loom Cable A2055402992

€47.95

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Part no. 2N0941329C

VW Volkswagen Crafter Mk2 SY Reduction Agent Metering System Unit 2N0941329C

€56.95

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Part no. 5C0937132A

Volkswagen VW Jetta A6 Fuse Box Cover Panel Top Lid 5C0937132A

€23.95

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Part no. 9329702

BMW F20 F30 F31 REM Rear Electronic Module Fuse Box Control Unit V3 9329702

€32.95

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Part no. 9387453

Display Screen BMW F30 F31 F32 F33 On-board Navigation Monitor 8,8" 9387453

€284.95

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Part no. F1B1-12A650-AYA

Ford Fiesta Mk7 1.5 TDCI UGJC 140HP Engine Control ECU F1B1-12A650-AYA Manual

€237.95

Free delivery: Mar 10 – 13

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Part no. A0004461160

Mercedes Sprinter W906 FleetBoard Onboard Time Recorder Control Unit A0004461160

€113.95

Free delivery: Mar 10 – 13

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Part no. 8631656

BMW F20 F21 F30 LCI M140i 340i Wiring Harness Motor Sensor System Module 8631656

€156.95

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Part no. 4M0959593N

Audi Q7 4M Front Door Control Module Unit ECU Driver's Side 4M0959593N

€56.95

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Part no. 6821206

BMW F45 F46 F48 Battery Cable IBS Negative Battery Lead 6821206

€23.95

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Part no. A1694710141

Mercedes W169 W245 Fuel Pump Cable Harness Bracket Mount Trim A1694710141

€23.95

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Part no. RHD-A1664404337

Mercedes C292 Positive Cable Battery Starter Alternator Plus Wiring A1664404337

€85.95

Free delivery: Mar 10 – 13

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Part no. 9154128

BMW Mini Cooper One R56 Front Left Passenger's Door Wiring Harness N/S 9154128

€23.95

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Part no. 8200587119

Renault Trafic III Vauxhall Vivaro B Relay 5-Pin Grey Unit 8200587119

€23.95

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Part no. 4H0959792H

Audi A8 D4 4H Front Door Control Module Unit ECU Passenger Side 4H0959792H

€23.95

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Part no. 4F0035411E

Audi TT 8J Speaker Loudspeaker Front Door Left Right N/O/S 4F0035411E

€28.95

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Part no. 9243896-1

Central Information Display BMW F10 F11 LCI Boardmonitor Screen 7" 9243896

€23.95

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Part no. 4M0907401AM

Audi Q7 4M 3.0TDI DPXB Quattro 218HP Engine Control ECU 4M0907401AM Automatic

€759.95

Free delivery: Mar 10 – 13

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Part no. A2055403103

Alternator Starter Wiring Harness Mercedes W205 GLC C253 OM651 A2055403103

€28.95

Free delivery: Mar 10 – 13

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Part no. 8518269-6

BMW E90 E91 LCI N47N 320d 184HP ECU KIT DDE CAS 3 Key 8518269 Manual

€161.95

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Part no. 7C0971819C

VW Volkswagen Crafter SY Reducing Tank Harness Adapter Wiring 7C0971819C

€51.95

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Part no. EJ32-1430-CC

Range Rover Evoque L538 Negative Battery Cable Wiring EJ32-14301-CC

€23.95

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Part no. A6461503734-3

Mercedes W204 C220 CDI 170HP OM646.811 Engine ECU Kit A6461503734 Automatic

€284.95

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Part no. FK72-13A444-BBC

Land Rover Discovery Sport L550 Rear Seat Folding Wiring Cable FK72-13A444-BBC

€28.95

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Part no. 8512498-5

BMW E84 E90 LCI 20dX 320xd N47 177HP ECU Kit DDE 8512498 CAS3 + Key Manual

€232.95

Free delivery: Mar 10 – 13

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Part no. A0045429218

YAW Rate Sensor Mercedes W203 W209 R171 Accelerator Speed Module A0045429218

€23.95

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Part no. 9292655

BMW F20 F21 F22 F30 F31 F32 F36 Module Control Unit FEM ECU LR01 9292655

€113.95

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Part no. 6950131

BMW X3 E83 Z4 E85 Front Rear Door Mid-range Audio Loudspeaker 6950131

€23.95

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Part no. A1695407405

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

€23.95

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Part no. A2034400033-2

Mercedes CLC CL203 Wiring Loom Cable Door Front Left Right N/O/S A2034400033

€23.95

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Part no. 8584816

Engine Wiring BMW G20 G21 X3 G01 B57 Injectors Module Harness Loom 8584816

€66.95

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Part no. 6956939-1

Changer Unit BMW E63 E64 6-disc Compact CD Head Player 6956939

€47.95

Free delivery: Mar 10 – 13

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Part no. 5M0907357G

Audi Q3 8U Headlight Range Control Unit Module ECU 5M0907357G

€56.95

Free delivery: Mar 10 – 13

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Part no. 9399466

Mini F54 F55 F56 F57 F60 Telematics Control Unit Module 84109399466 9399466

€23.95

Free delivery: Mar 10 – 13

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Part no. 4G0907637L

Audi RS6 C7 Acceleration Yaw Rate Sensor Module Control Unit ECU 4G0907637L

€37.95

Free delivery: Mar 10 – 13

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Part no. A2479001416

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

€89.95

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Part no. 8X0971693

Audi A1 8X Door Wiring Harness Loom Rear Left Right N/O/S Cabling 8X0971693

€23.95

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Part no. A9075402087

Mercedes W907 Starter Wiring Battery Alternator Cable Harness Loom A9075401305

€61.95

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Part no. 6850424

BMW X3 F25 ICM Air Module Control Unit SRS ECU 6850424

€61.95

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Part no. 8576341-1

BMW F20 F30 F31 116d 316d 116HP N47N Engine ECU Control Unit DDE 8576341 Manual

€61.95

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Part no. 8W0959593H

Audi A4 S4 B9 Front Door Control Module Unit Driver's Side 8W0959593H

€23.95

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Part no. 8K0959760

Audi S4 B8 Front Seat Control Unit Module Switch Left N/S ECU 8K0959760

€32.95

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Part no. 7583332-7

BMW E60 E61 LCI 523i N53 190HP Engine Control Module DME Kit 7583332 Automatic

€450.95

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Part no. 7457873

BMW F20 F21 F30 LCI Headlight Control Unit Module FLE2 7457873

€94.95

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Part no. 8J0907115N

Audi TT 8J 2.0 TFSI BWA 200HP Engine Control Module ECU Manual 8J0907115N

€85.95

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Part no. 9861558-1

Rain Sensor BMW F20 F21 F30 F31 Windscreen Light Solar Condensation Unit 9861558

€42.95

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Part no. 5N0971235A

Audi A3 8P VW Golf MK6 Battery Negative Earth Cable Harness Wiring 5N0971235A

€23.95

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Part no. 6805061

BMW F45 F46 Mini F55 F56 F57 Parking Assistant PDC Control Unit Module 6805061

€56.95

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Part no. A2049009907-2

Mercedes W204 Navigation Radio Player Head Unit Computer A2049009907

€227.95

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Part no. 8088723

Engine Wiring BMW X3M F97 X4M F98 Petrol S58 Module Sensors 1 Harness 8088723

€203.95

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Part no. 6927548

BMW Z4 E85 Drive For Window Lifter Motor Front Right O/S 6927548 9116626

€28.95

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Part no. 6986081-2

CD Changer BMW E60 E61 E63 E64 Compact CD Changing Unit 6986081

€37.95

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Showing 5941-6039 of 13888 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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