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. 6974245

BMW MINI Cooper Clubman R55 R55N LCi Retaining Bracket Safety Belt Rear Left N/S

PLN 42.95

Delivery: Mar 13

If paid before 14:00

Part no. A2128204185

Mercedes W204 W212 Door Module Control Unit Module Rear Right O/S A2128204185

PLN 42.95

Delivery: Mar 13

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Part no. 3C0906093C

Audi TT Mk2 8J Petrol Engine Fuel Pump Control Unit Module 3C0906093C

PLN 94.95

Free delivery: Mar 13

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Part no. A0009050438

Windscreen Camera Mercedes W204 W212 Front Windshield Camera Unit A0009050438

PLN 189.95

Free delivery: Mar 13

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Part no. A1698200089

Mercedes A B Class W169 W245 Aerial Antenna Amplifier Right O/S A1698200089

PLN 42.95

Delivery: Mar 13

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Part no. 7P5959107E

Porsche Macan 95B Rear Tailgate Control Module Unit 7P5959107E

PLN 189.95

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Part no. 9267214

BMW F20 F21 F22 F30 F31 F32 F33 F34 Air Control Unit Module ECU 9267214

PLN 42.95

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Part no. 6980078

BMW E88 Antenna Amplifier Aerial Diversity Module AMP 6980078

PLN 113.95

Free delivery: Mar 13

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Part no. A1179008600

Airbag Module Mercedes w176 Air Bag SRS Control Unit ECU A1179008600

PLN 189.95

Free delivery: Mar 13

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Part no. A1645400641

Mercedes-Benz M-Class W164 Battery Ground Earth Strap Cable Wiring A1645400641

PLN 123.95

Free delivery: Mar 13

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Part no. A0025422619-2

Mercedes ML W163 Relay 4-Pin Grey Tyco Set Kit A0025422619

PLN 42.95

Delivery: Mar 13

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Part no. A6549001400-1

Mercedes W213 E220 CDI 654.920 194HP Engine ECU Kit A6549001400 Automatic

PLN 1,899.95

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Part no. A0009054807-2

Mercedes W118 W177 W206 W247 NOX Sensor Electronics Module A0009054807

PLN 66.95

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Part no. 8W0959655F

Audi A4 B9 Air Module Crash Control Module Unit ECU 8W0959655F

PLN 854.95

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Part no. A0009058112

Mercedes C118 W177 W247 Negative Battery Terminal Cable Lead A0009058112

PLN 42.95

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Part no. 9470037

Differential Locking Module BMW F40 F48 Rear Axle Control Unit ECU 9470037

PLN 237.95

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Part no. 9119058

BMW E81 E87 E90 E91 Airbag Control Unit ECU NO CRASH DATA 9119058

PLN 66.95

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Part no. 6859714-1

BMW X5 E70 X6 E71 Air Suspension Supply Compressor Valve Control Unit 6859714

PLN 142.95

Free delivery: Mar 13

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Part no. 7850609

BMW F80 M3 F82 M4 LCI Cable Wheel Acceleration Sensor 7850609

PLN 142.95

Free delivery: Mar 13

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Part no. 9389560

Aerial Trap Circuit BMW G30 X3 G01 Antenna Amplifier Module Control Unit 9389560

PLN 42.95

Delivery: Mar 13

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Part no. 7627021

BMW 1 3 Series F20 F21 F30 Petrol N13 Harness Engine Sensors Module 1 7627021

PLN 123.95

Free delivery: Mar 13

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Part no. 9226881

BMW 1 Series F20 F20N F21 F21N LCI Radio Aerial Antenna Amplifier AM/FM 9226881

PLN 42.95

Delivery: Mar 13

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Part no. 4G8959760

Audi A6 C7 Front Driver Side Seat Control Module Unit 4G8959760

PLN 142.95

Free delivery: Mar 13

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Part no. 6927786

BMW X5 Series E53 Amplifier Compensator Holder Catch Bracket 6927786

PLN 108.95

Free delivery: Mar 13

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Part no. A2129006518

Door Module Mercedes W204 W207 W212 Front Right O/S Control Unit A2129006518

PLN 42.95

Delivery: Mar 13

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Part no. 9184432-1

BMW 1 3 Series E81 E87 E90 E91 Control Unit Airbag ECU NO CRASH DATA 9184432

PLN 66.95

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Part no. 8577243

BMW X3 F25 Battery Cable Wire Lead Positive Alternator Starter X4 F26 8577243

PLN 94.95

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Part no. 9218702

Rain Sensor BMW F10 F11 Light Solar Fogging Control Unit 9218702

PLN 61.95

Free delivery: Mar 13

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Part no. A1645403132

Mercedes-Benz M-Class ML W164 Wiring Loom Cable Harness Fuel Tank A1645403132

PLN 85.95

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Part no. 9364729

Mini F55 F56 F57 Battery Cable Positive Wire Lead Cable Terminal 9364729

PLN 47.95

Delivery: Mar 13

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Part no. A6395406209

Wiring Loom Mercedes W639 Vito Cable Door Wiring Cable A6395406209

PLN 47.95

Delivery: Mar 13

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Part no. 2261834

Ford B-Max 1.0 GTDi Ecoboost Fuel Injector Wiring Harness CM5G-9F666-BC

PLN 42.95

Delivery: Mar 13

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Part no. 24435922

GM Vauxhall Opel Relay 4-Pin Multi Use Glow Plug Unit Black Set 24435922

PLN 56.95

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Part no. A2045405609

Video Wiring Cable Mercedes W204 Video Unit Harness Cable Wire A2045405609

PLN 42.95

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Part no. A1669005412

Mercedes W166 Door Module Rear Left N/S Control Unit ECU A1669005412

PLN 142.95

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Part no. 9264923

BMW F01 F02 F10 F11 F13 Power Distribution Fuse Box Rear 9264923

PLN 56.95

Delivery: Mar 13

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Part no. 9181454

BMW X1 E84 Aerial Antenna Noise Suppression Filter 9181454

PLN 42.95

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Part no. 4F1910336B

Telephone Control Module Audi A8 4E S8 D3 Bluetooth Unit 4F1910336B

PLN 237.95

Free delivery: Mar 13

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Part no. KV6T-11000-BC

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

PLN 284.95

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Part no. 6977982-2

Mini Cooper R50 R53 R56 R57 R60 Relay No Contact Taubenblau Blue Set 2X 6977982

PLN 42.95

Delivery: Mar 13

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Part no. 4G0035223C

Audi A6 C7 Audio Sound System Amplifier Bose 4G0035223C

PLN 189.95

Free delivery: Mar 13

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Part no. 1K0971365CG

VW Volkswagen Golf Mk5 1K Seat Wiring Loom Cable Front Left N/S 1K0971365CG

PLN 113.95

Free delivery: Mar 13

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Part no. A1679050200

Mercedes A238 Tailgate Boot ECU Control Unit Module A1679050200

PLN 113.95

Free delivery: Mar 13

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Part no. 8U0959655B

Audi Q3 8U Air Module Control Unit SRS System ECU 8U0959655B

PLN 142.95

Free delivery: Mar 13

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Part no. 6964263

BMW 3 Series E93 E93N Cabrio Module Bracket Holder CTM 6964263

PLN 46.95

Delivery: Mar 13

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Part no. 6911038

BMW 3 X5 Series E46 E53 Airbag Side Impact Crash Sensor Bosch 6911038

PLN 42.95

Delivery: Mar 13

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Part no. 6967184

BMW X5 X6 Series E70 E71 Positive Battery Cable Terminal Box Base B+ 6967184

PLN 85.95

Free delivery: Mar 13

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Part no. 8C1T14303CA

Ford Transit Mk7 Negative Battery Terminal Cable Wiring 8C1T14303CA

PLN 94.95

Free delivery: Mar 13

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Part no. A1775401910

Mercedes W177 Door Wiring Rear Door Left N/S Module Harness Cables A1775401910

PLN 113.95

Free delivery: Mar 13

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Part no. 8631668

BMW F20 F21 F30 LCI M140i 340i Wiring Harness Injection Valve Ignition 8631668

PLN 408.95

Free delivery: Mar 13

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Part no. 7843335

BMW F10 M5 F12 M6 Engine Wiring Harness Valvetronic Servomotor Cyl.1-4 7843335

PLN 180.95

Free delivery: Mar 13

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Part no. A0025428719

Mercedes W176 W204 W207 W166 Relay 4 Pin Grey Hella A0025428719

PLN 42.95

Delivery: Mar 13

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Part no. A2118700110

Mercedes W219 Hood Bonnet Light Solar Sensor Module A2118700110

PLN 142.95

Free delivery: Mar 13

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Part no. 6938975

BMW E60 E61 E63 E64 6-disc Compact CD Changer 6938975

PLN 113.95

Free delivery: Mar 13

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Part no. 9136726-2

BMW Mini Cooper R55 R56 Multifuse B Battery Power Distributor Cable 9136726

PLN 18.95

Delivery: Mar 13

If paid before 14:00

Part no. 8X0959793B

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

PLN 42.95

Delivery: Mar 13

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Part no. 038907281D-2

VW Volkswagen Caddy 2K Audi A4 B9 Glow Plug Relay Unit Black Diesel 038907281D

PLN 42.95

Delivery: Mar 13

If paid before 14:00

Part no. 7075943-2

BMW E60 E61 E65 Front Left N/S Seat Height Adjustment Drive 7075943

PLN 61.95

Free delivery: Mar 13

If paid before 14:00

Part no. 9137804

Mini Cooper One R55 R56 R57 R58 R59 Drivers Door Wiring Harness Loom 9137804

PLN 42.95

Delivery: Mar 13

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Part no. 6956939

BMW E60 E61 E63 E64 6-disc Compact CD Changer with Magazine 6956939

PLN 42.95

Delivery: Mar 13

If paid before 14:00

Part no. A2649060400

Mercedes W205 W257 Starter Engine Motor A2649060400

PLN 379.95

Free delivery: Mar 13

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Part no. 3428336

Mini Clubman Cooper R55 Antenna Amplifier Diversity Signal Booster 3428336

PLN 203.95

Free delivery: Mar 13

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Part no. A1665400182-1

Mercedes C292 Fuse Box Cover Trim Panel Lid Black A1665400182

PLN 165.95

Free delivery: Mar 13

If paid before 14:00

Part no. 7515029-1

Mini Cooper One R50 R52 Petrol W10 Compact Alternator RTX 7515029

PLN 142.95

Free delivery: Mar 13

If paid before 14:00

Part no. 8S0971104

Audi TT FY Rear Bumper PDC Cables Set Wiring Loom Harness 8S0971104

PLN 142.95

Free delivery: Mar 13

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Part no. 9362395

BMW F20 F30 F31 F34 Electrical Body Control Unit Module REM V2 9362395

PLN 113.95

Free delivery: Mar 13

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Part no. 9218381-1

BMW F10 F20 F30 Steering Wheel Module Electronics Control Unit 9209427

PLN 142.95

Free delivery: Mar 13

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Part no. 9364552

Seat Wiring BMW F45 X1 F48 Mini F55 F56 Passenger's Side Sensor Cable 9364552

PLN 94.95

Free delivery: Mar 13

If paid before 14:00

Part no. 9188877

BMW F01 F02 F03 F10 F11 Steering Column Adjuster Switch 9188877

PLN 42.95

Delivery: Mar 13

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Part no. 9873895

BMW F40 Crash Control Unit Air Module ECU Continental 9873895

PLN 474.95

Free delivery: Mar 13

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Part no. A6395450203

Mercedes-Benz Vito W639 Fuse Box Cover Cap Trim A6395450203

PLN 75.95

Free delivery: Mar 13

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Part no. 9316569

BMW X5 F15 Fuse Box Rear Relay Module Control Unit 9316569

PLN 56.95

Delivery: Mar 13

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Part no. 9228495

BMW F07 GT ECU Body Control Module Junction Box V12 PL2 JBBFE III 9228495

PLN 127.95

Free delivery: Mar 13

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Part no. 7795485

BMW X1 E81 E84 E87 E90 E91 Earth Cable Battery Cable 7795485

PLN 42.95

Delivery: Mar 13

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Part no. 9267205

BMW E91 Touring LCI ECU Body Control Module Junction Box H2 9267205

PLN 61.95

Free delivery: Mar 13

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Part no. A2035450301

Mercedes-Benz C CLK Class W203 W209 Battery Terminal Fuse Box A2035450301

PLN 47.95

Delivery: Mar 13

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Part no. RVH000055

Land Rover Range Rover Sport L320 Air Suspension Valve Block Module RVH000055

PLN 56.95

Delivery: Mar 13

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Part no. 7191718

BMW Z4 Series E89 Roadster Cabrio Horn High Tone 7191718

PLN 94.95

Free delivery: Mar 13

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Part no. A1729058300

Mercedes SLK R172 Pedestrian Protection Impact Crash Sensor Module A1729058300

PLN 142.95

Free delivery: Mar 13

If paid before 14:00

Part no. 6923207

Mini Cooper One R50 R53 Alarm System Inclination Sensor III

PLN 42.95

Delivery: Mar 13

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Part no. 7P0907652

Yaw Sensor Audi Q7 4L Rotation Rate Unit Module 7P0907652

PLN 42.95

Delivery: Mar 13

If paid before 14:00

Part no. 1742690-1

BMW E60 E81 E87 E90 E91 X3 E83 Relay Changer Make Contact Salmon Red Set 1742690

PLN 42.95

Delivery: Mar 13

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Part no. 6820234

Air Conditioning Module BMW F20 F21 F30 F31 A/C Control Unit 6820234

PLN 61.95

Free delivery: Mar 13

If paid before 14:00

Part no. 9298958

Rear Electronic Module BMW F20 REM Fuse Box Control Unit V1 9298958

PLN 42.95

Delivery: Mar 13

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Part no. 8589907

Supply Module BMW F40 F48 Mini F55 F56 F57 Integrated Z11 Control Unit 8589907

PLN 61.95

Free delivery: Mar 13

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Part no. 5A5D3C0

Keyless Entry BMW F40 G20 G21 G30 G31 Comfort Access Antenna 5A5D3C0

PLN 42.95

Delivery: Mar 13

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Part no. 9287441

BMW F21 F22 F23 Wiring Loom Harness Passenger Side 9287441

PLN 61.95

Free delivery: Mar 13

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Part no. 7516376

BMW E65 E66 E67 Electric Valve 735i 745i 735Li 745Li 745LiS 7516376

PLN 42.95

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Part no. 9354228

Mini Cooper F56 Rain Light Turn On Sensor Unit 9354228

PLN 113.95

Free delivery: Mar 13

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Part no. A2135407744

Mercedes W213 Door Ambient Light Cable Harness Wiring Rear Right O/S A2135407744

PLN 142.95

Free delivery: Mar 13

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Part no. A1695451940

Mercedes W169 W245 Fuse Box Module Unit A1695451940

PLN 142.95

Free delivery: Mar 13

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Part no. 7585950

Mini Cooper S R55 R56 Ignition Wiring Harness Injection Valve N14 7585950

PLN 427.95

Free delivery: Mar 13

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Part no. 9290014

BMW X3 F25 Light Module Control Footwell ECU Unit FRM3 9290014

PLN 455.95

Free delivery: Mar 13

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Part no. 4N0959651D

Audi Q5 FY Crash Impact Sensor Unit Module Left Right N/O/S 4N0959651D

PLN 61.95

Free delivery: Mar 13

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Part no. 6925642

BMW 5 6 Series E60 E61 E63 Reserve Fuse Carrier Housing 6925642

PLN 37.95

Delivery: Mar 13

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Part no. 8514577

BMW X3 F25 Diesel N47N Engine Gearbox Wiring Loom Harness 8514577

PLN 189.95

Free delivery: Mar 13

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Part no. 9149836

Seat Control Unit BMW X5 E70 E87 E90 Module ECU Electronic Module 9149836

PLN 142.95

Free delivery: Mar 13

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Part no. A2128205026

Mercedes W212 Impact Crash Sensor Door Left Right A2128205026

PLN 42.95

Delivery: Mar 13

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Part no. 4G0907468F

Audi A6 C7 Central Getaway Control Unit Module ECU 4G0907468B

PLN 474.95

Free delivery: Mar 13

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Showing 793-891 of 13825 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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