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. 8512415

Mini Cooper D R60 ALL4 N47N 112HP Diesel Engine Control Unit ECU DDE 8512415

€51.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8P0971085A

Audi A3 8P Rear Bumper PDC Parking Sensor Wiring Harness Loom 8P0971085A

€32.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8W0907217D

Audi A4 B9 Front Windscreen Windshield Lane Assist Camera 8W0907217B

€227.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 7619136

BMW E84 F25 F26 N20 Engine Sensor Module Wiring Cable Loom Harness 7619136

€56.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8574091

BMW F10 F11 520d N47N 184HP Engine Control Unit ECU DDE 8574091 Automatic

€85.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8X0959792F

Audi A1 8X Front Door Control Module Unit Passenger Side 8X0959792F

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 7531992

BMW X5 E53 3.0i M54 Wiring Loom Harness Engine Automatic Gearbox 7531992

€56.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A1729007003

Seat Module Mercedes W204 W212 Control Unit Front Left Right N/O/S A1729007003

€104.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 3455305

Mini R57 R57N R58 R59 DWA-Alarm System Relay ECU 3455305 65753455305

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2439008400

Mercedes GLC X253 Sound Audio Amplifier Module Rear Harman A2439008400

€56.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8K0959795C

Audi A4 B8 Door Module Rear Left Right N/O/S Control Unit Module ECU 8K0959795C

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 6863433

BMW F20 F21 F22 F30 F31 ECU ICM Plus Control Unit Module 6863433

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 6998487

Airbag Module Mini F55 F56 F60 BMW X1 F48 F45 ECU Control Unit Air Bag 6998487

€155.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2189015200

Mercedes X218 Air Module Control Unit ECU Module A2189015200

€28.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8Y0971085A

Audi S3 8Y Electric Front Bumper Wiring Harness PDC Loom Cable 8Y0971085A

€80.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. MB3T-14A411-SRC

VW Volkswagen Amarok NF Ford Ranger Cab Wiring Harness Loom MB3T14A411SRC

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8K0959792D

AUDI S5 8T Door Control Module ECU Front Left N/S 8K0959792D

€32.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9233034-SCG

PDC Parking Sensor BMW X5 E70 F10 F11 F12 Ultrasonic Sensor Space Grey 9231283

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 7601305

BMW F10 F11 LCI F13 N63 N63N Petrol Water Pump Adapter Lead Cable Wiring 7601305

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9286110

BMW F20 F21 F30 F31 F32 Body Control Comfort Module Unit FEM ECU LR01 9286110

€113.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A6401501933

Engine Wiring Mercedes W169 W245 OM640 Cable Loom Harness A6401501933

€56.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 03F906070GN-2

Audi A1 8X 1.2 TFSI CBZA 86HP Engine Control ECU Kit 03F906070GN Manual

€189.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8656997

BMW X5 F15 X6 F16 Ground Cable Negative Battery Lead Wire 8656997

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. KV6T10C679BC

Ford Transit Connect Battery Cable Negative Lead Terminal Harness KV6T10C679BC

€28.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 7599881-12

BMW E81 E87 LCI Petrol N43 116i 2.0 122HP ECU Kit 7599881 DME CAS3 Key Manual

€161.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9124585-SED

BMW E87 E90 PDC Parking Sensors Ultrasonic Set x2 Sedonarot - A79 9124585

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8517874

BMW F20 F21 F30 116d 316d Diesel N47N Engine Control Unit ECU DDE 8517874 Manual

€32.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8W6907217A

Audi A5 F5 Front Windscreen Windshield Lane Assist Camera 8W6907217A

€37.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9267980

BMW F10 Fuse Location Diagram Map Fuse Grouping 9267980

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9313616

BMW F30 F31 Driver's Side Door Wiring Electrical Loom Harness Cable 9313616

€56.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9243781

BMW F12 F12 LCI Hi-Fi Audio System Amplifier Harman Becker 9243781

€165.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 197-299-00

BMW F20 F21 DRL Daytime Running Lights Led Module Control Unit PCB 197-299-00

€42.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9128573

BMW 1 Series E87 LCI E87N Cable Set PDC Front Wiring Loom 9128573

€42.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 7L5971204

Porsche Cayenne 955 Washer Spray Nozzle Wiring Loom Cable 7L5971204

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9282069

BMW 5 Series F10 F11 Cable Loom Front Driver's Door Wiring Harness 9255986

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A0045468440

Mercedes W177 Power Distributor Connector Plug Unit A0045468440

€23.95

Free delivery - Wed, Jan 14

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Part no. A0045454140

Mercedes ML W164 W251 Door Wiring Joint Protective Cap Bracket

€23.95

Free delivery - Wed, Jan 14

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Part no. 8K0915181N

Audi A1 8X Negative Battery Terminal Cable Wiring 8K0915181N

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 7520019-5

MINI Cooper S R52 R53 W11 170HP Engine Control Unit ECU DME 7520019 Manual

€47.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A0009009213

Mercedes W447 Fuel Pump Control Module A0009009213

€85.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A9069014700

Air Module Mercedes W639 W906 Control Unit ECU Air Sensor 0285011060

€132.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9304007

BMW G30 Seat Occupancy Sensor Mat Passenger Side Control Unit Module 9304007

€32.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9496815

Front Impact Sensor BMW F70 G05 G14 G15 G29 Safety Crash Module Unit 9496815

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2218704192

Mercedes W221 Air Condition Climate Control Module Unit A2218704192

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 4KE959655H

Audi Q7 4M Air Module Control Unit ECU SRS Module Unit 4KE959655H

€156.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 7809680

Engine Wiring BMW F10 F11 N57 N57S Loom Cable Harness Injector Module 7809680

€32.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 4F0919129C

Audi A8 D4 A6 C6 TV Tuner Digital Video Control Module 4F0919129C

€51.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9348726

BMW F20 F21 F30 Air Module Control Unit 0285013626 9461918 9296494 6826983

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9124585-SED1

BMW E87 E90 PDC Parking Sensor Ultrasonic Set x4 Sedona Rot - A79

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 6958526-1

BMW 5 X5 X6 Series 1 E60 E61 E70 E71 F10 F11 Seat Adjustment Switch Right O/S

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2125420018-TNG

Mercedes W204 Parking Sensor PDC Distance Front Tenorite Grey - 755 A2125420018

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 3414469

BMW X3 E83 Fuse Grouping Front Stick-on Label Diagram 9267980

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9381882

BMW F30 F31 F80 M3 Sound Amplifier Hifi Audio Control Unit Harman Becker 9381882

€70.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 5Q0907530AJ

Audi RS3 8V Gateway Control Module GCM Unit ECU 5Q0907530AJ

€32.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 5F4971035H

Seat Leon Mk3 5F Door Wiring Loom Harness Front Driver's Side 5F4971035H

€28.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8518268

BMW E90 E91 LCI N47N 318d Diesel Engine Control Unit DDE ECU Manual 8518268

€66.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8P3907357B

Audi S3 8P Xenon Headlight Range Control Module Unit ECU 8P3907357B

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 4H0959795D

Audi A8L 4H Rear Door Module Control Unit Left Right N/O/S 4H0959795D

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2125458040

Bracket Holder Mercedes W204 W212 W222 Auxiliary Generator Battery A2125458040

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A1646803535

Mercedes-Benz M-Class ML W164 B-Pillar Trim Cover Bottom Left N/S A1646801935

€32.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8380118

BMW E46 Amplifier Holder Audio Catch Bracket Mount Trim 8380118

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2139002210

Mercedes-Benz W176 W205 W207 W213 Bluetooth Control Unit Module ECU A2139002210

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 6867168

BMW 1 2 Series F20 F21 F30 F31 N13 N47N ECU ICM Control Unit Module 6867168

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8P0035535

Audi A4 B7 Amplifier Bracket Aerial Antenna Module Mount Holder 8P0035535

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A1779002207

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

€42.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 141951253B

Audi VW Volkswagen Seat Relay Unit Module 4 Pins 141951253B

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 02M911023N

Volkswagen Touran Engine Starter Motor 02M911023N

€28.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8363668

BMW X3 X5 Series E53 E83 Steering Column Turn Indicator Switch Stalk 8363668

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 5A4A1E1

Kafas Camera BMW G20 G30 G28 G80 F40 F44 Front Assist Camera Module 5A4A1E1

€170.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9352786

BMW F33 F83 M4 Convertible Folding Top Roof ECU Module Control Unit CTM 9352786

€75.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8506434

BMW E87 E90 LCI N47 118d 318d Diesel Engine Control Unit ECU DDE Manual Gearbox

€61.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 5Q0907530AL

Audi A3 8V VW Golf 5G Central Gateway Control Unit Module Relay ECU 5Q0907530AL

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A1669005511

Door Module Mercedes W176 W246 Front Left N/S Control Unit VST A1669005511

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. P1WT-19H517-AE

VW Volkswagen Amarok Mk2 Auto Brake Trailer Module Control Unit P1WT-19H517-AE

€123.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 4F0971845A-2

Audi A6 C6 Comfort Body Module Fuse Relay Box Control Unit 4F0971845A

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9383681-1

Mini F55 Fuse Box Front Body Control Module ECU BCM Unit 13275881

€113.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2229004213

Keyless Module Mercedes W205 W213 C253 ECU Door Lock Control Unit A2229004213

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 5Q0937615C-1

Audi TT FV Fuse Relay Box Module Electrical Control Unit 5Q0937615C

€28.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2129018508

Mercedes W212 Air Bag Control Unit ECU AirBag Sensor Module A2129011105

€28.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2118703226

Mercedes W245 Bluetooth Control Unit Module Hands Free A2118703226

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 03L906018JM-1

Audi Q5 8R 2.0 TDI CGLC Quattro 177HP Engine Control ECU Kit 03L906018JM Manual

€237.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 4H0962239A

Audi A8 D4 Rear Hatch Boot Lid Tailgate Opening Cable Wiring Line 4H0962239A

€42.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 9365819

BMW X5 F15 Wiring Rear Right O/S Door Harness Loom 9365819

€28.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8E1971035DJ

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

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A1668200689

Antenna Amplifier Mercedes W176 Aerial Module Unit Rear A1668200689

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A0009007126

Air Conditioning Module Mercedes W205 W213 C253 A/C Control Unit ECU A0009007126

€37.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. LHD-R56-CARPLAY

Mini R56 R57 Display Screen Instrument Cluster Speedo Android CarPlay 4+64GB LHD

€284.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 7810980-1

BMW E60 E90 X5 E70 3.0sd 335d 535d M57N2 Engine ECU KIT DDE 7810980 CAS3 + Key

€522.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 6949381

BMW E65 E66 Front Door Wiring Door Cable Harness Loom 6949381

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 7570254

Plus Cable BMW X1 E81 E87 E90 E91 N45 N46 Alternator Starter Wiring 7570254

€23.95

Free delivery - Wed, Jan 14

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Part no. 7852630

Differential Lock Module BMW F10 M5 F80 M3 Rear Axle Control Unit ECU 7852630

€56.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2129008825

Mercedes C204 Fuse Box Control Unit SAM Module Relay A2129008825

€113.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 8387551

BMW 3 Series E46 Battery Positive Cable Fuse Box Base B 8387551

€23.95

Free delivery - Wed, Jan 14

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Part no. 9201980

BMW F01 F02 F07 F10 F11 F12 F13 G11 LCI Battery Power Dividing Element 9201980

€85.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2479003808

Suspension Module Mercedes C118 W177 W247 Control Unit ECU A2479003808

€123.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A2059007218

Automatic Closing Motor Mercedes S205 Estate X253 Trunk Lid A2059007218

€47.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A0025467940

Receptacle Housing Mercedes W164 W203 W639 Dashboard Wiring Harness A0025467940

€23.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. 4N0907063ME

Audi Q7 4M Body Control Comfort Unit Module BCM Convenience Unit ECU 4N0907063ME

€237.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A4479053905

Mercedes W447 Aerial Antenna Amplifier Control Unit Module A4479053905

€56.95

Free delivery - Wed, Jan 14

If paid before 14:00

...

Showing 2575-2673 of 12468 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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