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. 8632692

BMW X5 F15 N20 Petrol Wiring Harness Transmission Gearbox Module Cable 8632692

€175.95

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Part no. 6C0907359

Audi A4 B8 Air Suspension Module Regulation Control Unit 6C0907359

€32.95

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Mercedes A238 Tailgate Boot ECU Control Unit Module A1679050200

€28.95

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BMW F20 F21 F30 F31 F32 Body Comfort Module FEM ECU LR01 Control Unit 9366407

€161.95

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Head-Up Display Hud Mini Cooper F54 F55 F56 F57 Project Dash Screen 8702093

€113.95

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BMW F20 Alternator Engine Alternator Generator Denso 170A Petrol N55 7639661

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Mercedes Sprinter W907 W910 Radio Stereo Player Head Unit A9078209400

€104.95

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Mercedes W221 Bluetooth Antenna AMP Amplifier Module A2218203375

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BMW F20 F21 F22 F30 F32 Front Electronic Module Control Unit FEM 6825541

€99.95

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Audi A4 B7 Front Door Wiring Harness Loom Cable Left N/S 8E1971035DJ

€23.95

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BMW Z4 Series E85 Roadster Head Lamp Cleaning Device Container 7110854

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Seat Ibiza KJ1 VW Polo MK6 Front Camera Lane Assist Control Unit 2Q0980653H

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Volkswagen VW Golf Mk5 Rain Sensor Windscreen Control Unit Module 1K0955559M

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Audi RS3 8P Front Headlight Xenon Wire Cable Harness Wiring Left N/S 8P0941029BF

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Part no. 1K0955559AB

Volkswagen Golf Mk5 Rain Sensor Front Windscreen Control Unit Module 1K0955559AB

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VW Transporter T6 Fusebox Module Power Distribution Control Module 7LA937550A

€23.95

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Ford Mondeo Mk4 Focus Mk3 Starter Motor Diesel Engine AV6N-11000-GD

€47.95

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Audi A6 C7 ESP Yaw Rate Module Control Unit Sensor ECU 4G0907637H

€75.95

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Part no. 5Q4959393P

Volkswagen Crafter SY Mk2 Door Module Control Unit Driver's Side 5Q4959393P

€37.95

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Part no. A2128270228-SEL

Mercedes W212 Roof Antenna Amplifier Shark Selenite Grey - 992 A2128270228

€23.95

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Part no. EB3T-10C652-AA

Ford Ranger Mk3 Positve Battery Cable Loom Wire Wiring EB3T-10C652-AA

€51.95

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Porsche Cayenne 92A Wiring Loom Harness Cable 7P5971693F

€80.95

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Part no. LR014002-2

Land Rover Discovery 4 L319 Rear Taillight Lamp Wiring Cable Right O/S LR014002

€23.95

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Audi Audi Q5 FY 2.0 TFSI QUATTRO Petrol Fuel Injectors Wiring Harness 06L971627M

€23.95

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Part no. 6960225

BMW E65 E66 E67 Sensor Vehicle Centre Air Control Unit Module 6960225

€23.95

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Part no. 6956750

BMW E87 Control Unit PDC Parking Sensor Module Nautikblau Blue - A21 6956750

€23.95

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Part no. A1698204726

Mercedes-Benz A-Class W169 Rear Left Door N/S Control Unit Module A1698204726

€23.95

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Part no. A2469017000

Mercedes W176 Windscreen Rain Sensor Unit Module A2469017000

€32.95

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Part no. A2125455640

Mercedes W212 Battery Holder Mount Bracket Support E-Class A2125455640

€23.95

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Porsche Macan 95B USB SD SIM Card Module Multimedia Reader Port 95B035736A

€113.95

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Part no. 3D0909139D

Porsche Cayenne 955 Keyless Module Kessy Control Unit ECU 3D0909139D

€417.95

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Mercedes SLK R171 Central Gateway Module ECU Control Unit A1715405045

€23.95

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Ford Focus Mk3 Multimedia Head Unit Control Switch Panel BM5T-18K811-BA

€28.95

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Part no. 3428557

BMW Z4 E86 Alarm System Ultrasonic Roof Control Module 3428557

€75.95

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Volkswagen Crafter SY Mk2 Door Module Control Front Passenger Side 5Q4959392P

€32.95

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Part no. CVS-012-5

CVS-012-5 Expansion Module Electrical Unit Light Control Module

€56.95

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Mercedes W204 Injection Electrical Wiring M271 Petrol Engine Cable A2711504733

€23.95

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BMW F20 F30 F32 xDrive 184HP N47N Engine Control ECU Kit DDE 8578946 Manual

€213.95

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Audi A4 B8 Saloon Rear Lamp Tail Light Wiring Harness Plug Left N/S 8K0973706

€23.95

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

€23.95

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Audi A8L 4H Rear Bumper PDC Parking Sensor Wiring Harness Loom Cable 4H0971104J

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Mercedes W177 Power Distributor Connector Plug Unit A0045468440

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Audi A3 S3 8V Front Door Card Wiring Harness Passenger Side 8V3971036

€28.95

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BMW X5 E70 Navigation System CCC CD Player Sat Nav Head Unit 9147618

€332.95

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VW Passat Radio Remote Control Alarm Key Fob Control Unit Module

€23.95

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BMW E90 E91 E92 LCI 320d N47N 163HP Engine Unit ECU Kit DDE 8506566 Manual

€94.95

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Ford Transit Connect Mk2 II Dashboard Display Screen Panel KT1T-18B955-EB

€123.95

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Mercedes-Benz A-Class W169 Rear Right Door O/S Control Unit Module A1698204826

€23.95

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BMW E60 E63 E87 E90 E91 Relay Make Contact Orange Bosch 4 Pins Set 1378238

€23.95

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Mini Cooper One R55 R56 Door Wiring Harness Factory Right O/S 9137703

€23.95

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VW Volkswagen Transporter T5 Body Control Module BCM Control Unit 7H0937086H

€189.95

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BMW E60 E61 E63 Passenger Side Door Airbag Control Module 6948692

€23.95

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Part no. AV1T-14A584-HCD

Ford B-Max Mk1 Door Loom Wiring Harness Cable AV1T-14A584-HCD

€23.95

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Part no. ET7T-18B955-BC

Ford Fiesta Mk7 Dashboard Display Multifunction Screen Monitor ET7T-18B955-BC

€28.95

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Part no. 6981946

BMW 7 E65 E66 E67 Antenna Amplifier Control Module ECU Signal Booster 6981946

€80.95

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Part no. A2129005614-1

Mercedes C207 W212 W218 Head Unit Navi CD Player Navigation A2129005614

€237.95

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Part no. YMQ501631

Land Rover Discovery 3 L319 Rear Parking Sensor Wiring Loom Harness 4H2214A614MA

€28.95

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Part no. 4H0937517

Audi A8L 4H Fuse Relay Battery Junction Box Housing 4H0937517

€66.95

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Part no. A2139058001

Mercedes C238 W213 Trunk Lid Handsfree Switch Sensor A2139058001

€32.95

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Door Wiring BMW X3 G01 F97 X4 G02 F98 Cable Harness Rear Left Right N/O/S

€23.95

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BMW E84 E90 E91 LCI 320xd N47 Cable Alternator Starter Base B

€23.95

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Adblue Module BMW F40 F44 F45 X1 F48 Control Unit ECU SCR 5A0E219

€32.95

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BMW F20 F45 F46 Kafas Camera Control Module Unit ECU 9384988

€23.95

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Part no. 9247088

BMW X1 Series E84 Wiring Loom Harness Passenger Side 9233559

€23.95

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Part no. A2125403005

Mercedes W212 M271 Wiring Battery Alternator Starter Harness Cable A2125403005

€113.95

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Part no. A6429002900-11

Mercedes W164 ML300 OM642.820 204HP Engine Control ECU Kit A6429002900 Automatic

€332.95

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Part no. 1734633

Ford Fiesta MK7 1.6 TDCI Starter Motor Engine Diesel 8V2111000AD

€32.95

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Part no. 6913389

BMW X3 X5 Z4 E53 E83 E85 6 Disc CD Changer Multichanger Without Magazine

€37.95

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Mercedes W204 Media Interface Control Unit Module ECU A2048708026

€23.95

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Audi A6 C6 Cable Wiring Loom Heater Matrix Air Conditioning Cable 4F0971547

€23.95

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Audi A3 8V Keyless Entry Amplifier Control Box Module Aerial Antenna 8V5035225

€23.95

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Part no. 06A903143P

Audi TT 8N Alternator Bracket Mount Holder 06A903143P

€28.95

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Part no. 7H0907300

Volkswagen Transporter T6.1 Engine Bay Main Fuse Box Top Cover 7H0907300

€23.95

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Part no. 8654460-2

Mini Cooper F54 F55 136HP Petrol B38 Engine ECU Kit DME 8654460 + BDC + Key

€370.95

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Part no. 8519663-16

Mini Cooper SD R60 R61 ALL4 N47N 143HP ECU Kit DDE 8519663 CAS3 Key Manual

€194.95

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Part no. W164-JUNSUN

Mercedes W164 X164 Junsun Car Radio 10.1"Android CarPlay 32GB XT8191CX-F

€170.95

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Part no. 9118611

BMW Z4 E86 Hifi Audio Sound AMP Amplifier Module 9118611

€574.95

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Part no. 059907309AC-1

Audi Q7 4M 3.0 TDI DPXA 286HP Quattro Engine Control ECU 059907309AC Automatic

€550.95

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Part no. A2128208826

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

€23.95

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Part no. 7L0907719

Volkswagen Touareg 7L Anti Theft Alarm System Control Module Unit ECU 7L0907719

€23.95

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Part no. EB3T-14603-A

Ford Ranger Mk3 T6 Positive Battery Cable Lead Terminal Harness EB3T-14603-A

€23.95

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Part no. 9145007

BMW E87 E90 X3 E83 Hands-free Electronics Charging Module ULF 9145007

€32.95

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Part no. 8647878

BMW X5 F15 N20 Petrol Sensor System Engine Wiring Harness Cable Loom 8647878

€175.95

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Part no. A2465401950

Battery Base Mercedes C117 W176 W246 Power Fuse Relay Box A2465401950

€23.95

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Range Rover Evoque L538 2.2 TDCI Starter Motor EJ3211001AB

€47.95

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Mercedes W205 Antenna Aerial Amplifier Duplexer Module Receiver Unit A2389055000

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Mercedes W205 Centre Console Wiring Harness Cable Loom A2055404734

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Audi A4 B8 Antenna Amplifier Diversity 8K5035225C

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C205 Fuse Box Mercedes C205 Electrical Interior Relay Fuse Socket Control A2055402850

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Audi A4 B7 Cabrio Alarm Signal Body Control Sensor Module Unit 8H0951178

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Wiring Harness BMW E81 E82 E87 LCI E88 Air Valve Air Flap Cable Wire 9128569

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BMW F20 F21 F30 F31 ECU ICM Plus Control Unit Module Airbag 6863385

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Audi A6 C7 BCM Body Control Module Unit ECU 4H0907063GH

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BMW PDC E81 E87N LCI Wiring Front Bumper Parking Senors Harnes Loom 9236518

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Mercedes W176 W204 W212 Telematics Communication Control Unit Module A2429004801

€23.95

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Part no. A6081550035

Mercedes W177 Alternator Mounting Bracket Carrier A6081550035

€66.95

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Part no. 14B296AA

Ford Transit Connect Yaw Sensor ESP Speed Sensor Control Unit Module 14B296AA

€28.95

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Part no. 7990758-CAR

BMW F33 PDC Ultrasonic Parking Sensor PDC 7990758 Carbonschwarz Metallic - 416

€32.95

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BMX X4 F26 X6 F16 Cental Woofer Speaker Audio Unit Left Right N/O/S 9297897

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Showing 4951-5049 of 14013 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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