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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Peugeot Boxer II Citroen Relay III Fuse Box Control Unit Module 46858322

€284.95

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BMW F20 Front Left Door N/S Wiring Loom Harness Cables 9251715

€23.95

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BMW X1 E84 20d 20dX Diesel N47N Engine Control Unit ECU DDE 8519009 Manual

€75.95

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Part no. 9292945

BMW F20 F21 F22 F30 F31 F32 F36 FEM Module Control Unit 9292945

€113.95

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BMW E60 E61 E63 PDC Rear Parking Sensor Ultrasonic Titangrau II - A08 6989136

€32.95

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BMW F20 F30 F31 LCI B38 ECU Basic DME Control Unit Automatic Gearbox 8663284

€313.95

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BMW E90 E90N E91 E91N LCI M3 Wiring loom rear door left right 6938225

€23.95

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Part no. A1649100075-1

Mercedes ML W164 Lumbar Module Front Seat Lumbar Control Unit A1649100075

€56.95

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Part no. LHD-R56-CARPLAY

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

€284.95

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Part no. 8513184-3

BMW X3 F25 20dX Diesel N47N 184HP Engine Module ECU DDE 8513184 Manual

€47.95

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Part no. A1679009011

Mercedes W205 C213 X253 Rear Door Control Module Unit ECU Left N/S A1679009011

€42.95

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Part no. A2535402128

Mercedes X253 Starter Motor Wiring Harness Cable A2535402128

€66.95

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Part no. 03E971612AE

Volkswagen Polo 6R Mk5 Engine Wiring Loom Harness Cable 03E971612AE

€123.95

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Part no. 03G903139D

Audi A4 B7 Engine Alternator Mount Support Bracket 1.9 2.0 TDI 03G903143D

€23.95

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BMW X3 E83 Z4 E85 E86 Radio Business CD Player Multimedia Unit 9197127

€113.95

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Audi TT 8J 3.2 V6 BUB Ignition Wiring Harness Guide Trim 022971615B

€42.95

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Part no. CC1T-11000-DC

Ford Transit Custom Starter Motor Engine Actuator Diesel 2.2 TDCi CC1T-11000-DC

€47.95

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Part no. 39113-2A511

Kia Ceed I 1.6 CRDI 115HP D4FB Diesel Engine Control ECU 39113-2A511 Manual

€32.95

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Part no. 8507981

BMW F07 GT F10 F11 Engine Wiring Loom Harness Cables M57Z Diesel 8507981

€184.95

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Part no. 4H0971160A

Audi A8 D4 Door Card Wiring Harness Loom Front Passenger Side 4H0971160A

€23.95

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Part no. 8K0971228AH

Audi A5 8T Positive Battery Lead Terminal Cable Wiring 2.0 TFSI 8K0971228AH

€66.95

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Part no. F1ET-14F144-BC

Ford Transit Connect Door Module Front Right O/S Control Unit ECU F1ET-14F144-BC

€23.95

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Part no. F1ET-14F142-BC

Ford Transit Connect Door Module Front Left N/S Control Unit ECU F1ET-14F142-BC

€23.95

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Part no. GK2T-11000-DB

Ford Transit Custom Engine Starter Motor 2.0 EcoBlue GK2T-11000-DB

€94.95

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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. 9270392-2

BMW F20 F21 F22 Central Information Display Dashboard Screen 6,5" 9270392

€23.95

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Part no. A0009061004

Mercedes W213 C238 C257 Parking Brake Actuator Motor A0009061004

€56.95

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Part no. 9218381-1

BMW F10 F20 F30 Steering Wheel Module Electronics Control Unit 9209427

€37.95

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Part no. 6C1T-12B637-JJ

Ford Transit Mk7 Engine Wiring Loom Harness Cables 2.2 TDCi 6C1T-12B637-JJ

€132.95

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Part no. H1BT18K811LF

Ford Transit Custom Mk1 Radio Head Unit Control Panel H1BT18K811LF

€37.95

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Part no. H1BT18B955EF

Ford Transit Custom Mk1 Dashboard Radio Head Unit Display H1BT-18B955-EF

€94.95

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Part no. KV6T10C679BC

Ford Transit Connect Battery Cable Negative Lead Terminal Harness KV6T10C679BC

€28.95

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Part no. 03L903023K

Audi A3 8V A4 A5 B8 Alternator Generator Electrical Unit Diesel 03L903023K

€61.95

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Part no. KV6T-14B060-AAF

Ford Transit Connect Battery Cable Engine Wiring Harness Loom KV6T-14B060-AAF

€37.95

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Part no. 7809999-3

BMW X3 E83 LCI 1.8sd 2.0sd N47 177HP Engine Control Unit ECU DDE 7809999 Manual

€180.95

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Part no. 42024550

Mercedes W176 W246 C117 Starter Motor Herth+Buss Diesel Engine OM651 42024550

€23.95

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Part no. JK2T14F642AC

Ford Transit Custom Data Link Obd Port Module JK2T-14F642-AC

€23.95

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Part no. JK2T15K868AB

Ford Transit Custom Rear Bumper PDC Cables Wiring Loom Harness JK2T-15K868-AB

€47.95

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Part no. 8573257-9

BMW F20 F30 F32 120d 320d 420d Diesel N47N 163HP Engine ECU DDE 8573257 Manual

€32.95

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Part no. FV6T-14324-BBB

Ford Transit Connect Mk2 Starter Earth Ground Wire Cable FV6T14324BBB

€32.95

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Vauxhall Opel Insignia A 2.0 TDCI Engine Control Module 55585024 Manual

€28.95

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Peugeot 207 Engine Wiring Harness Cable Loom 1.6 HDi DV6 9663381380

€94.95

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Peugeot 206 2.0HDI 90HP DW10TD Engine Control Unit ECU 9664843780 Manual

€32.95

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Part no. 6C1T14A481CA

Ford Transit Mk7 Under Bonnet Fuse Box Module Onboard Supply 6C1T14A481ACA

€70.95

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Part no. 9247481

BMW X3 F25 Control Module CAS Unit ECU 20dX Diesel N47N 9247481

€113.95

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Part no. 95230-4H200

Hyundai H-1 iLoad Relay Module Control Unit ECU 95230-4H200

€113.95

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Part no. 5QA919283G

Audi A3 8V Park Parking Assist PDC Distance Control Unit Module 5QA919283G

€28.95

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Part no. 8578946-3

BMW F20 F30 F32 120d 320d 420d 184HP N47N Engine ECU Kit DDE 8578946 Automatic

€142.95

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Part no. GK3T-14A120-AC

Ford Transit Positive Battery Lead Harness Wiring Cable Loom GK3T-14A120-AC

€51.95

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Part no. 9643218980

Peugeot 206 1.6 NFU TU5JP4 109HP Engine Control Unit ECU 9643218980 Manual

€28.95

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Part no. A2709002100-15

Mercedes C117 CLA 180 270.910 122HP Engine ECU Kit A2709002100 Automatic

€503.95

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Part no. 575035736A

Seat Ibiza FR Double USB C Charging Port Socket Connection 575035736A

€32.95

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Part no. KT1T18B955EB

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

€123.95

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Part no. 059903143K

Audi A4 B7 A6 C6 Alternator Bracket Pulley Mount Holder 2.7 3.0 TDI 059903143K

€23.95

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Part no. 8K0959793C

Audi A4 B8 Door Module Control Unit ECU Front Driver's Side 8K0959793C

€23.95

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Part no. 8K0959794A

Audi A4 B8 Door Module Rear Right O/S Control Unit Module ECU 8K0959794A

€23.95

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Part no. 2Q0915181B

Seat Ibiza Mk5 Negative Battery Terminal Cable Lead 2Q0915181B

€23.95

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Part no. 8W1907063AG

Audi A4 B9 Body Control Comfort Unit Module BCM Unit ECU 8W1907063AG

€284.95

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Part no. 8W1907064BC

Audi A4 B9 Body Control Module BCM Comfort Control Unit Power Supply 8W1907064BC

€104.95

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Part no. A2188201926

Mercedes CLS C218 Bi-Xenon Headlight Ballast Module Control Unit A2188201926

€89.95

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Part no. A2129007024

Mercedes CLS C218 Front Fuse Relay Box On Board Supply A2129007024

€75.95

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Part no. 6R0971349AM

Volkswagen Polo Mk5 V 6R Battery Cable Alternator Starter 6R0971349AM

€28.95

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Part no. 03C903023F

Volkswagen New Beetle 1.4 TSI Petrol Engine Alternator Motor 14V 110A 03C903023F

€66.95

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Part no. 9268710-1

BMW F01 Display Screen On-Board Central Information Monitor 10,25" 9241819

€32.95

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Part no. BK3T18D815BG

Ford Transit MK8 Radio Head Unit Control Panel BK3T-18D815-BG

€32.95

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Part no. A2129060605

Mercedes W212 Fuse Box Rear Relay Control Unit Electric Module SAM A2129060605

€85.95

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Part no. 420919275-BLM

Audi A5 8T Rear Bumper PDC Parking Distance Sensor Black Magic Pearl - C9Z

€23.95

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Part no. A6549003300

Mercedes W177 Glow Plug Relay Preglow Module Diesel OM654 A6549009900

€42.95

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

€23.95

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Part no. 7524715

BMW Z4 E85 Roadster Starter Earth Ground Wire Cable 2.0 Petrol 7524715

€51.95

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Part no. GK2T14B144GA

Ford Transit Mk8 VI Fuse Box Module Positive Battery Terminal GK2T-14B144-GA

€28.95

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Part no. HC345H297AA

Ford Transit Mk8 2.0 EcoBlue AdBlue Module Control Unit HC34-5H297-AA

€28.95

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Part no. 5A374F9

BMW F40 Radio CD Player Head Unit Navigation Sat Nav CIC Alpine 5A374F9

€450.95

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Part no. 5G0971104L

VW Volkswagen Golf Mk7 Wiring Loom PDC Rear Harness Parking Sensor 5G0971104L

€28.95

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Part no. 06L903027

Audi Q5 FY Alternator Generator Valeo 2.0 TFSI 06L903027

€94.95

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Part no. KV6T-11000-BC

Ford Transit Connect Starter Motor Engine 1.5 TDCI Diesel KV6T-11000-BC

€56.95

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Part no. A2065403645

Mercedes W206 Front Door Wiring Harness Cable Left Right N/O/S A2065403645

€94.95

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Part no. 04L903017A

Audi A4 B8 2.0 TDI CNHC Diesel Alternator Generator 04L903017A

€61.95

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Part no. 06J903023BX

Audi A1 8X Seat Leon Mk3 Cupra 5F Alternator Generator Petrol Engine 06J903023BX

€94.95

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Part no. 9314229

BMW F20 Front Electronic Module Body Control Unit FEM ECU 9314229

€284.95

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Part no. DE8T19H463DC

Ford Transit Connect Mk2 II Rain Sensor Control Unit Module FoMoCo DE8T19H463DC

€23.95

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Part no. F1FT10C679BA

Ford Transit Mk7 V Negative Battery Terminal Cable Wiring F1FT10C679BA

€23.95

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Part no. AV6T14A067BC

Ford Transit Connect Mk2 II Fuse Box Battery Terminal Unit Module AV6T14A067BC

€23.95

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Part no. 3Q0959354A

Seat Leon Mk3 Door Crash Impact Sensor Front Left Right N/O/S 3Q0959354A

€23.95

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Part no. 9162930-WB1

BMW E81 E82 E87 E90 E91 Parking Sensor PDC Ultrasonic Bluewater - 896 SET X2

€28.95

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Part no. 2706050200

Lexus LS400 1UZFE V8 Petrol Engine Alternator Generator Denso 2706050200

€170.95

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BMW F01 F02 F20 F21 Interior Antenna Aerial Convenience Comfort Access 9144260

€23.95

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Part no. 9118263

BMW F01 F02 F03 F10 Antenna Amplifier Module Trap Circuit 9118263

€37.95

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Part no. 3Q0907530AC-1

Audi Q2 GA Gateway Diagnostics Interface Control Module 3Q0907530AC

€23.95

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Part no. 5Q0971250T

Volkswagen Golf Mk7 Seat Leon 5F Battery Wire Negative Earth Lead 5Q0971250T

€28.95

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Part no. 8X0959793B

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

€23.95

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Part no. 5Q4959593E

Seat Leon Mk3 Door Module Control Unit Front Driver's Side Door 5Q4959593E

€23.95

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Part no. 8X0959792B

Audi A1 8X Door Module Control Unit Controller Front Passenger's Side 8X0959792B

€23.95

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Part no. 8C1T18K931AD

Ford Transit Mk7 V Radio CD Multimedia Player Head Unit ECU 8C1T-18K931-AD

€332.95

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Part no. A2049003509

Mercedes W204 S204 Radio Head Unit Sat Nav CD Player 2049003509

€51.95

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Part no. 8K0915181H

Audi A1 8X Negative Minus Battery Terminal Cable 1.4 TFSI CAXA Petrol 8K0915181H

€23.95

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Part no. A1679008311

Mercedes C238 Door Control Unit Module ECU Front Left N/S A1679008311

€47.95

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Part no. A0015452616

Mercedes W212 Transmission Control Unit Module VDO EGS 722.646 A0015452616

€28.95

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Part no. 4G8959795F

Audi A7 4G Rear Door Control Module Unit ECU Left Right N/O/S 4G8959795H

€23.95

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Showing 298-396 of 11774 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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