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. 8W0959593H

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

€23.95

Free delivery: Mar 10 – 13

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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. 7329789-1

BMW 2 F46 Gran Tourer Lamp Tillight Plug Socket Wiring Cable Left N/S 7329789

€23.95

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

€203.95

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

€28.95

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

€37.95

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Part no. A2198203626

Mercedes CLS W219 Door Module Rear Right O/S Control Unit A2198203626

€23.95

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Part no. 6922262

BMW 7 Series E65 E66 E67 Control Unit Door Front Passenger Side 6922262

€23.95

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Part no. 8T0959792G

Audi A4 B8 Front Door Lock System Module Right O/S Control Unit ECU 8T0959792B

€23.95

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Part no. 7574294

Mini Cooper S R56 Automatic Gearbox TCU ECU Control Unit EGS Module 7574294

€56.95

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Part no. 3T1T-14301-AF

Ford Transit Connect Negative Battery Terminal Cable Wiring 3T1T-14301-AF

€32.95

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Part no. 8602991

Mini F54 F55 F56 F57 F60 Battery Wire Cable Negative Earth Lead 8602991

€23.95

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Part no. 9297787

BMW F10 F20 F30 Battery For Telematics Control Unit Module 9297787

€23.95

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Part no. 7P6035670B

VW Volkswagen Touareg 7P CD Radio Stereo Head Unit Panel 7P6035670B

€389.95

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Part no. A1775401629

Mercedes W177 Rear Bumper PDC Wiring Loom Parking Sensor A1775401629

€37.95

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Part no. 8T0959793J

Audi A5 8T Door Module Control Unit ECU Front Driver's Side 8T0959793J

€23.95

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Part no. 6974370

Alarm System Unit BMW E60 E61 Ultra Sonic Module 6974370

€23.95

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Part no. 8D0951253

Audi Q7 4L Relay Unit Module 4 Pins 8D0951253

€23.95

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Part no. 6801299

BMW F06 F12 F13 Central Information Display Screen Monitor 10" 6801299

€213.95

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Part no. 8512047-7

BMW E90 E91 LCI N47N 320d 163HP ECU Module KIT DDE 8512047 Automatic

€180.95

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Part no. 83A971104S

Audi Q3 F3 Rear PDC Parking Sensors Wiring Loom Harness 83A971104S

€70.95

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Part no. 5Q0971250N

Audi A3 8V Volkswagen VW Golf Mk7 Negative Cable Ground Wire Harness 5Q0971250N

€23.95

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Part no. DH22-14B192-AA

Land Rover Discovery Sport L550 Relay 4-Pin 20A 12V Unit Black DH22-14B192-AA

€23.95

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Mercedes-Benz Vito W639 Fuse Box Cooling Outlet Pipe Air Duct A6395480174

€23.95

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Part no. 9273666

BMW F33 F83 M4 Convertible Rear Antenna Aerial Amplifier AM/FM 9273666

€23.95

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Part no. A2129060005-1

Mercedes W212 Fuse Box Module Rear Relay Electric Control Unit SAM A2129060005

€23.95

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Part no. 6839769

KaFAS Module BMW F10 F20 F30 Mini F55 F56 Assist Camera Control Unit 6839769

€32.95

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Part no. A0009005517

Mercedes W177 W205 W238 W257 Gearbox Control Unit Module ECU A0009005517

€113.95

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Part no. 6777641-1

Air Module Wiring BMW X5 E70 E81 E87 E90 E91 E92 E93 Steering Wheel Loom

€32.95

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Part no. 9345322

BMW F10 LCI ECU Body Control Module V2 Junction Box PL6 JBBFE III 9345322

€23.95

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Part no. 7512967

Mini Cooper R50 R52 R53 Base B+ Terminal Point Engine Compartment 7512967

€23.95

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Audi Q3 8U Engine Injector Module Wiring Harness Cable 2.0 TFSI 06J971082E

€28.95

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Part no. A2125406905

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

€28.95

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Mercedes Sprinter W906 OM651 Engine Wiring Harness Cable Loom A9065402727

€47.95

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Mini Cooper S R53 Positive Battery Cable Plus Pole Wiring Loom Harness 1508931

€80.95

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BMW F30 LCI 330e B48X Positive Battery Cable Plus EME Loom 9387147

€56.95

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Part no. 6949228-1

2 x Mini Cooper R52 Convertible DWA Door Alarm System Module Unit Set 6949228

€23.95

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Part no. 9217033

Battery Cable BMW F01 F02 Positive Wiring Plus Pole Red 9217033

€28.95

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Part no. 5Q4959592N

VW Volkswagen T-ROC AV11 Front Door Control Module ECU Passenger Side 5Q4959592N

€23.95

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Part no. A4475411200

Mercedes Vito W447 Battery Support Holder Bracket Mount Tray A4475411200

€32.95

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Part no. 6858698

BMW F20 F21 F22 F30 F31 ECU ICM Plus Control Unit Module 6858698

€23.95

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Part no. 8C11-12A650-CG

Ford Transit MK7 2.2 TDCI P8FA 85HP Engine Control ECU 8C11-12A650-CG Manual

€132.95

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Part no. 8573260-1

BMW F20 F21 116d ed Diesel N47N 116HP Engine Control ECU DDE 8573260 Manual

€71.95

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Part no. 9383063

Mini Cooper F55 F56 Navigation DAB Head Unit Sat Nav Professional 9383063

€233.95

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Part no. 9301309

Air Conditioning Unit BMW F20 F21 F30 F31 Control Unit A/C Module 9301309

€23.95

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Part no. 5Q0959393B

Audi A3 8V Front Door Control Module Unit Right O/S 5Q0959393B

€23.95

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Part no. 5Q0937084DR

Audi Q2 GA Body Control Comfort Unit Module BCM Unit ECU 5Q0937084DR

€28.95

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Part no. DH22-14B192-BA

Land Rover Discovery Sport L550 Relay 4-Pin Unit 12V 20A Black DH22-14B192-BA

€23.95

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Part no. A6512012009

Alternator Support Bracket Mercedes W212 OM651 Belt Tensioner Holder A6512012009

€23.95

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Part no. A0035421619-1

Mercedes W177 Relay 052 Fuse Box Relay Slot B D E 70A Tyco SET X2 A0035421619

€23.95

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Part no. 7790996

Mini One D R50 W17 Base B+ Battery Terminal Point Engine Compartment 7790996

€23.95

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Part no. 6957330

BMW E60 E61 E63 Power Distribution Electrical Fuse Box 6957330

€23.95

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Part no. A2319014702

Mercedes R231 Air Module Control Unit ECU SRS Module A2319014702

€284.95

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Part no. 8506375-3

BMW E81 E87 E90 E91 LCI 118d 318d N47 Diesel ECU KIT DDE 8506375 CAS3 + Key

€113.95

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Part no. 9367673

Mini Cooper F55 F56 F57 Visual Boost Surround Central Cover Instrument 9367673

€47.95

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Part no. 98661208300

Porsche Boxster 986 Rear Screen Window Heated Wiring Harness Cable 98661208300

€23.95

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Part no. 9264975

BMW X5 E70 X6 E71 Front Seat Control Unit Module Memory ECU 9264975

€28.95

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BMW X5 Series E53 3.0d M57N Cable Starter Base B 7791352 12427791352

€23.95

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Part no. 7541779

BMW Z4 E85 2.0i N46 Cable Alternator Starter Base B+ 7541779

€23.95

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Part no. 4F0959792P

Audi A6 C6 Front Door Lock Control Module Unit ECU Passenger Side 4F0959792P

€23.95

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Part no. 04L907288E

VW Volkswagen Transporter T6 Glow Plug Relay Unit Black 9 Pins 04L907288E

€23.95

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Part no. 4M0035456A

Audi A4 B9 Antenna Amplifier Aerial Control Module Unit 4M0035456A

€32.95

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Part no. 7L0971279

Porsche Cayenne 9PA Sensor ABS Wiring Harness Front Left Right N/O/S 7L0971279

€56.95

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Part no. C1BT-14B321-FF

Ford Fiesta Mk7 3Dr Air Module ECU Control Unit C1BT-14B321-FF

€28.95

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Part no. 80A035223A

Audi Q5 FY Sound System Audio Amplifier Amp Unit Bang & Olufsen 80A035223A

€332.95

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Part no. 5E5035577B

Skoda Octavia 5E Antenna Amplifier Aerial Control Module Unit 5E5035577B

€28.95

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Part no. 9274276

BMW F07 Gran Tourismo Headlight Footwell Light Control Module FRMIII 9274276

€51.95

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Part no. 8E0951253

Fuel Pump Module Audi A4 B7 A6 C6 Q7 4L Sender Control Relay Unit ECU 8E0951253

€23.95

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Part no. A2055407616

Wiring Mercedes W205 Electrical Cable Transmission To Body A2055407616

€23.95

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Part no. 8W0959592H

Audi A4 B9 A5 F5 Front Door Module Control Unit ECU Passenger Side 8W0959592H

€23.95

Free delivery: Mar 10 – 13

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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. 9285504

Distributor BMW X5 F15 X6 F16 B + Battery Power Distributor 9285504

€23.95

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Part no. 8R0919604A-1

Audi A5 8T Multimedia Radio Sat Nav Screen Display Head Unit 8R0919604A

€37.95

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Part no. 9437208

BMW F45 F48 F49 Mini Countryman F60 Ground Earth Cable Adapter Mass 9437208

€28.95

Free delivery: Mar 10 – 13

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Part no. A2118705026

Passenger Seat Module Mercedes W164 W203 W211 Memory Control Unit A2118705026

€23.95

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Part no. A0015424523

Parktronic Display Mercedes W207 W212 PDC System Parking Sensor A0015424523

€23.95

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Part no. A2078201089

Mercedes W207 A207 Radio Aerial Antenna Amplifier Module Unit A2078201089

€23.95

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Part no. 9119357

BMW 1 3 5 E60 E81 E87 E90 E91 Mini R55 R56 DAB Radio Tuner Module 9119357

€23.95

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Part no. 8091664

Baterry Cable Bracket BMW X3M F97 X4M F98 S58 Alternator Wire Holder 8091664

€28.95

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Part no. 8Z0951253

Skoda Octavia II 5 Pin Black Relay Control Module Unit Set Kit 8Z0951253

€23.95

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Part no. 8T0907468R

Audi A4 B8 Gateway Control Unit Module ECU 8T0907468R

€23.95

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Part no. A1175450800

Negative Battery Terminal Mercedes C117 W176 W246 Lead Connector A1175450800

€23.95

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Part no. 8582280-3

BMW F20 F21 116d N47N 116HP ECU Kit DDE 8582280 + Key + Lock + FEM Manual

€284.95

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Part no. 6946108

BMW 7 Series E65 E66 E67 Sensor Rear Seat Airbag 6946108

€23.95

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BMW X5 E39 E53 Sunroof Sliding Roof Drive Unit Motor Actuator 8377939

€23.95

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Part no. 3449686

Mini Cooper R55 R56 R57 Passive Go Module Control Unit 3449686

€23.95

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Part no. A2125406105

Mercedes W212 Rear LED Wiring Cable Harness Loom A2125406105

€23.95

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Part no. 9259831

BMW E93 Convertible Wiring Loom Front Door Cables Cable Passenger Side 9186668

€23.95

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Part no. 8576333

BMW F20 F30 F32 120d 320d 420d N47N 184HP Engine Unit ECU DDE 8576333 Automatic

€113.95

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Part no. CA6T-14B526-DC

Ford Fiesta Mk7 Start Stop Engine Module Control Unit ECU CA6T-14B526-DC

€23.95

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Part no. 9319433

Mini R61 Sat Navi Stereo Radio Audio Head Unit Player 9319433

€284.95

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Part no. VP7EKX-13K198-AB

Ford Fiesta MK7 Front Headlight Adjustment Motor Range Control VP7EKX-13K198-AB

€23.95

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Showing 6040-6138 of 13895 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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