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. 4H0035446A

Audi A7 4G Antenna Signal Amplifier Control Unit ECU 4H0035446A

PLN 42.95

Delivery - Tue, Jan 13

If paid before 14:00

Part no. 9153806

BMW F01 F02 Rear Heater Blower Motor Resistor 9153806

PLN 47.95

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Part no. A2465408109

Door Wiring Mercedes W176 Loom Cable Rear Left Right N/O/S A2465408109

PLN 47.95

Delivery - Tue, Jan 13

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Part no. 7805349-1

BMW X3 Series E83 LCI M47N2 2.0d 150HP ECU Kit DDE + EWS4 + Key 7805349 Manual

PLN 948.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 9347822

Head Unit BMW F10 F11 F20 F30 Navigation Sat Nav High Control Module 9347822

PLN 664.95

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Part no. 6857208

Parking Distance Assistant BMW 20 F21 F30 F31 F36 Control Unit Module 6857208

PLN 142.95

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Part no. 8V0971104

Audi A3 S3 8V Sportback Wiring Harness PDC Parking Sensor Rear Bumper 8V0971104

PLN 189.95

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If paid before 14:00

Part no. A2139008822

Air Module Mercedes W213 C238 Control Unit Module ECU A2139008822

PLN 142.95

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Part no. 7644251

Mini Cooper One R55 R56 R57 R60 Battery Mounting Bracket Clamp Bolt Holder

PLN 42.95

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Part no. 8638784-1

Mini One F55 F56 B38 102HP Petrol Engine Control Unit ECU DME 8638784 Manual

PLN 1,139.95

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Part no. 7P6971161FL

VW Touareg 7P Door Wiring Loom Harness Cable Front Passenger Side 7P6971161ES

PLN 142.95

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Part no. A9078200301

Mercedes W907 Radio Professional System Controller Head Unit A9078200301

PLN 569.95

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Part no. A2125400080

Mercedes W212 Fuse Box Housing Relay Unit Module A2125400080

PLN 47.95

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Part no. 6941430

BMW 5 6 Series E60 E63 Passenger Door Airbag Control Module N/S 6941430

PLN 66.95

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Part no. BK3V-14517-CE

Ford Transit Mk8 Fuse Relay Box Control Unit Module BK3V14517CE

PLN 284.95

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Part no. 9178791

BMW F01 F02 F10 F11 Cable Wiring Set ARS Valve Block 9178791

PLN 142.95

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Part no. 7620987-1

Mini One R55 R56 LCI N16 1.6 98HP Engine ECU Kit DME 7620987 CAS 3 + Key Manual

PLN 1,044.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8518569-5

BMW F20 F21 F30 F31 N47N 118d 318d 143HP Engine Control ECU DDE 8518569 Manual

PLN 332.95

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Part no. 6R0959655M

VW Volkswagen Polo 6R Seat Ibiza 6J Air Module Control Unit ECU 6R0959655M

PLN 161.95

Free delivery - Tue, Jan 13

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Part no. 8718207

BMW F20 F21 F22 F30 F31 LCI Head Unit Sat Nav Media Navigation 8718207

PLN 1,424.95

Free delivery - Tue, Jan 13

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Part no. 03L906018JR-1

Audi A4 B8 2.0 TDI CJCB Engine Control Unit Module ECU Kit 03L906018JR Manual

PLN 949.95

Free delivery - Tue, Jan 13

If paid before 14:00

Audi A5 8T 2.0 TDI Gateway Control Module Unit ECU 8R0907468AE

-100%

Part no. 8R0907468AE

Audi A5 8T 2.0 TDI Gateway Control Module Unit ECU 8R0907468AE

Promo price

PLN 432.95

-PLN 0.05

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A2469052602

Dashboard Panel Mercedes W176 W246 Switch Dynamic Select Start/Stop A2469057902

PLN 113.95

Free delivery - Tue, Jan 13

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Part no. 9388179

Mini Cooper One F54 F55 F56 F60 ECU Body Domain Controller BDC Module 9388179

PLN 617.95

Free delivery - Tue, Jan 13

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Part no. 4M0907247A

Keyless Entry Amplifier Audi A4 B9 A5 F5 Control Box Module Antenna 4M0907247A

PLN 61.95

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If paid before 14:00

Part no. 6925942

BMW E60 E61 Cable Loom Door Wiring Harness 6925942

PLN 94.95

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Part no. A2048700185

Mercedes W204 Bluetooth Control Unit Module Media Interface ECU A2048700185

PLN 379.95

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If paid before 14:00

Part no. 8605454

Engine Wiring BMW F10 F21 F30 LCI F36 N20 Loom Module Harness Cable 8605454

PLN 237.95

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If paid before 14:00

Part no. A2045420623

Mercedes W204 Warning Device Parktronic Display Rear Sound Signal A2045420623

PLN 85.95

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Part no. 8W0907064EC

Audi A5 F5 BCM Body Comfort Module Onboard Control Unit ECU 8W0907064EC

PLN 284.95

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Part no. A2539009309

Mercedes C253 W293 Rain And Light Sensor Control Unit Module ECU A2539009309

PLN 332.95

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Part no. BK2T14A175CA

Ford Transit Custom MK8 Fuse Relay Box Control Unit Module BK2T-14A175-CA

PLN 94.95

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Part no. A2469017000

Mercedes W176 Windscreen Rain Sensor Unit Module A2469017000

PLN 99.95

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Part no. 9207515

BMW X1 E84 Battery Cable Wire Lead Positive 9207515 61129207515

PLN 427.95

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Part no. 5Q0907530AL

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

PLN 42.95

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Part no. A2055406304

Mercedes W205 Hybrid Battery Cable Starter Wiring Loom Harness A2055406304

PLN 113.95

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Part no. A2038202285

Mercedes-Benz C-Class W203 Door Control Module Right Rear O/S A2038202285

PLN 42.95

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Part no. 8586540-5

BMW F30 F32 LCI 330d 430d N57N 258HP Control Unit ECU Kit DDE 8586540 FEM Key

PLN 1,495.95

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If paid before 14:00

Part no. 3G0845109

Volkswagen Tiguan Skoda Octavia 5E Sun Light Solar Sensor Control Unit 3G0845109

PLN 94.95

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Part no. A2125403005

Mercedes W212 M271 Wiring Battery Alternator Starter Harness Cable A2125403005

PLN 474.95

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Part no. 4F0907283

Audi A6 C6 FL Tire Pressure Control Module 4F0907283

PLN 123.95

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Part no. A2229063202-1

Fuse Box Mercedes W205 W222 Electrical Relay Box Module Unit A2229063202

PLN 94.95

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Part no. 8573257-1

BMW F20 F30 F32 120d 320d 420d Diesel N47N 184HP ECU Kit DDE 8573257 Automatic

PLN 474.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. A2044409005

Mercedes W204 Battery Wiring Starter Alternator Wiring Harness A2044409005

PLN 61.95

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Part no. 8067512

BMW F10 F11 F30 F31 Alarm System Unit Security Basis Module 8067512

PLN 256.95

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Part no. 7850609

BMW F80 M3 F82 M4 LCI Cable Wheel Acceleration Sensor 7850609

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A2098209810

Mercedes CLK A209 Cabrio Alarm Anti Theft System Control Module Unit A2098209810

PLN 80.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 7E0907655A

Audi TT 8J ESP YAW Lateral Acceleration Sensor 7E0907655A

PLN 94.95

Free delivery - Tue, Jan 13

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Part no. 7810002-1

BMW 1 Series E81 E82 E87 LCI E88 N47S 123d ECU Kit DDE CAS 3 Key 7810002 Manual

PLN 1,519.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 4H0035225L

Audi A8 D4 4H Aerial Antenna Amplifier AMP Booster Module 4H0035225L

PLN 42.95

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Part no. 4H0959760F

Audi A8 D4 Front Seat Backrest Adjustment Module Left Right N/O/S 4H0959760F

PLN 237.95

Free delivery - Tue, Jan 13

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Part no. 9282424

BMW 3 5 Series F10 F30 Control Unit Module Top Rear Side View Camera 9282424

PLN 712.95

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If paid before 14:00

Part no. RU5T-14H474-FAL

Volkswagen VW Amarok Mk2 Gateway Module Control Unit RU5T-14H474-FAL

PLN 1,139.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 5N0971235A

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

PLN 75.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8U0998572A

Audi Q3 8U Headlight Module LED Headlamp Control Unit 8U0998572A

PLN 199.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 7899655

Rear Speaker BMW E63 E64 Door Card Loudspeaker Left Right N/O/S Logic 7 7899655

PLN 132.95

Free delivery - Tue, Jan 13

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Part no. 8507398

Glow Bracket BMW E60 E87 LCI E90 E91 E92 F10 F11 N47 Diesel Relay Plug 8507398

PLN 61.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 8C11-3C190-AB

Ford Transit Yaw Sensor ESP Rotation Rate Control Unit Module 8C11-3C190-AB

PLN 42.95

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Part no. 9118111

BMW 1 Series E81 E82 Door Wiring Loom Harness 9118111

PLN 56.95

Delivery - Tue, Jan 13

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Part no. A6519009302-4

Mercedes W639 116 CDI 651.940 163HP Engine Module ECU Kit A6519009302 Key Lock

PLN 1,757.95

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Part no. 8K0971687S

Audi A4 B8 Door Wiring Harness Loom Rear Left N/S Cabling 8K0971687S

PLN 75.95

Free delivery - Tue, Jan 13

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Part no. 3455306-1

2 x Mini R57 Cabrio Convertible DWA Door Alarm System Control Module Set 3455306

PLN 42.95

Delivery - Tue, Jan 13

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Part no. 4G0919475L

Audi A6 C7 4G PDC Module Parking Sensor Assistance Control Unit 4G0919475L

PLN 617.95

Free delivery - Tue, Jan 13

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Part no. 9328591

BMW X6 F16 Boot Trunk Lid Tailgate Wiring Loom Harness Cable 9328591

PLN 123.95

Free delivery - Tue, Jan 13

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Part no. 6916228

Mini Cooper R50 R53 VICS Receiver Control Unit Module Japan 6916228

PLN 104.95

Free delivery - Tue, Jan 13

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Part no. A9079051602

Mercedes W907 Aerial Antenna Amplifier Control Unit Module A9079051602

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. 9149674

BMW 3 5 Series E60 E90 Portable DVD System Alarm Ultra Sonic Module Unit 6980090

PLN 85.95

Free delivery - Tue, Jan 13

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Part no. 6921415

BMW E46 E89 Mini R50 R52 Parking Control Module Unit PDC 6921415

PLN 42.95

Delivery - Tue, Jan 13

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Part no. A2479052503

Mercedes Sprinter W910 Remote Key Control Unit A2479052503

PLN 284.95

Free delivery - Tue, Jan 13

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Part no. 6923502

Mini R50 One D Diesel W17 Cable Starter Base B- Wire 6923502

PLN 47.95

Delivery - Tue, Jan 13

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Part no. 6824116

BMW 3 F30 LCI 330e Hybrid High Voltage Battery Wiring Inverter Cable 6824116

PLN 379.95

Free delivery - Tue, Jan 13

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Part no. A0065424220

Mercedes W164 W251 High Tone Horn Signal Right O/S A0065424220

PLN 61.95

Free delivery - Tue, Jan 13

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Part no. 7809196

BMW X3 E83 LCI 2.0d N47 177HP Engine ECU Control Unit Module DDE 7809196 Manual

PLN 664.95

Free delivery - Tue, Jan 13

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Part no. 9221109-2

BMW E60 Body Gateway Module Control Unit KGM E6X High D-Can Lear 9221109

PLN 75.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 6821407

High Voltage Cable BMW F45 Mini F60 Hybrid Harnes EDH 6821407

PLN 142.95

Free delivery - Tue, Jan 13

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Part no. A2049007905

Mercedes W205 Towbar Trailer Hitch Control Module Unit ECU HELLA A2049007905

PLN 427.95

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Part no. 5Q0971250P

Audi S3 8V Battery Wire Cable Negative Earth Lead 95Q0971250P

PLN 42.95

Delivery - Tue, Jan 13

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Part no. 7811111

BMW X3 E83 LCI 2.0d N47 177HP Engine Module ECU Kit DDE 7811111 Automatic

PLN 1,424.95

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Part no. 8512415-9

Mini One D R60 N47N 90HP Diesel Engine Control Module ECU DDE 8512415 Manual

PLN 949.95

Free delivery - Tue, Jan 13

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Part no. A2219009903

Mercedes-Benz S-Class W221 Rear Door N/O/S Control Unit Module A2219009903

PLN 94.95

Free delivery - Tue, Jan 13

If paid before 14:00

Part no. 9313614

BMW F30 F31 F80 M3 Driver's Side Door Wiring Loom Cable 9313614

PLN 208.95

Free delivery - Tue, Jan 13

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Part no. A2129003414

Fuse Box Mercedes C204 W204 Front Relay Control Unit Module SAM A2129003414

PLN 455.95

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Part no. A2128201689

Mercedes W212 Antenna Amplifier Aerial Module Unit A2128201689

PLN 42.95

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Part no. 3C0937125A-1

VW Volkswagen Tiguan 5N Passat B7 Engine Bay Fuse Relay Box Terminal 3C0937125A

PLN 42.95

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Part no. A2128204713

Seat Wiring Mercedes W212 Front Loom Harness Passenger Side A2128204713

PLN 66.95

Free delivery - Tue, Jan 13

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Part no. A1679007012

Mercedes C118 W177 W247 Keyless Go Module ECU Entry Control Unit A1679007012

PLN 218.95

Free delivery - Tue, Jan 13

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Part no. 5K0959793C

Skoda Octavia RS 1Z Door Module Control Unit ECU 5K0959793C

PLN 237.95

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Part no. 8K0971036B

Audi RS4 B8 Door Wiring Harness Cable Loom Front Right O/S 8K0971036B

PLN 123.95

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Part no. A2078201089

Mercedes W207 A207 Radio Aerial Antenna Amplifier Module Unit A2078201089

PLN 47.95

Delivery - Tue, Jan 13

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Part no. A2055409240

Mercedes W205 Front Door Electric Wiring Harness Loom Cable Left N/S A2055409240

PLN 94.95

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Part no. 9352861

FEM Unit BMW F20 F22 F30 F32 Control Unit Module ECU Fuse Box 9352861

PLN 569.95

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Part no. 9385026-1

BMW F01 F07 LCI F10 F11 F25 Air Module Control Unit ECU 9385026

PLN 94.95

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Part no. 9259468

BMW X3 F25 Fuse Box Power Distribution Control Unit Box Rear 9259468

PLN 113.95

Free delivery - Tue, Jan 13

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Part no. 4G8959793G

Audi RS6 C7 Front Door Module Driver's Side Control Unit ECU 4G8959793G

PLN 94.95

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Part no. 5Q0915181C

Audi A3 8V Negative Battery Cable Terminal Clamp Wire 5Q0915181C

PLN 42.95

Delivery - Tue, Jan 13

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Part no. 09185826

Vauxhall Opel Relay Speed Signal Electrical Unit 5 Pin Siemens Orange 09185826

PLN 42.95

Delivery - Tue, Jan 13

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Part no. A2035407408

Mercedes-Benz C W203 Rear Left Right Door Wiring Loom Harness A2035407308

PLN 42.95

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Part no. 8W0959593H

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

PLN 42.95

Delivery - Tue, Jan 13

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Showing 1684-1782 of 12186 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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