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. A2215408445

Mercedes W221 Radar Distronic Adaptive Cruise Control Sensor A2215408445

€379.95

Free delivery - Wed, Jan 14

If paid before 14:00

Part no. A0015424623-1

Mercedes-Benz C E A207 W204 W212 1 Front Parking PDC Display Panel A0015424623

€23.95

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Part no. A0061512501

Mercedes W203 W204 Diesel Engine Starter Motor A0061512501

€37.95

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Part no. 7810860-1

BMW 3 Series E90 E91 E92 E93 LCI N47N Engine Alternator Starter Cable B 7810860

€23.95

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Part no. 1K0971121CL

Volkswagen Golf 1K 5D Front Door Wiring Loom Harness Passenger Side 1K0971121CL

€23.95

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Part no. A2059002922

Door Module Mercedes W205 W253 C253 Front Left N/S Control Unit ECU A2059002922

€32.95

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Part no. 8W0959595M

Audi A4 B9 A5 F5 Door Module Rear Right Left N/O/S Control Unit 8W0959595M

€32.95

Free delivery - Wed, Jan 14

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Part no. A2519062200-1

Mercedes W251 COMAND Navigation Head Unit Radio Sat Nav Screen A2519062200

€332.95

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Part no. 6968652

BMW 3 Series E93 E93N LCI Aerial Antenna AM / FM Right O/S 6968652

€23.95

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Part no. A2115460580

Wiring Holder Mercedes W211 Cable Loom Harness Cover Channel A2115460580

€23.95

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Part no. A1665459340

Mercedes W166 C292 Fuse Box Relay Control Unit Module A1665459340

€32.95

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Part no. 5Q0919283B

PDC Module Audi A3 8V Seat Leon Skoda Octavia Parking Control Unit 5Q0919283B

€32.95

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Part no. A2129005101

Fuse Box Mercedes W212 Rear SAM Relay Fuse Box Control Module A2129005101

€32.95

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Part no. A2229008911

Tuner Box Mercedes W213 W205 W222 Digital Audio Control Unit DAB ECE A2229008911

€56.95

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Part no. 7805349-2

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

€303.95

Free delivery - Wed, Jan 14

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Part no. 9309997

Mini F57 Cabrio Aerial Base Antenna Rod Unit AM / FM / TEL / GPS / DAB-L 9309997

€99.95

Free delivery - Wed, Jan 14

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Part no. A9079051202

Mercedes Sprinter W907 Battery Wire Negative Lead Cable A9079051202

€28.95

Free delivery - Wed, Jan 14

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Part no. A2139008330

Mercedes W177 W213 W247 Automatic Gearbox Control Unit Module ECU A2139008330

€94.95

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Part no. A1695458140

Mercedes W169 W245 Relay Control Unit Bracket Mount Holder Cover A1695458140

€23.95

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Part no. A1648200485

Mercedes ML W164 Door Module Front Right O/S Control Unit ECU A1648200485

€23.95

Free delivery - Wed, Jan 14

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Part no. 9805670-1

Mini R60 Countryman Window Lifter Motor Drive Front Right O/S Door 9804384

€23.95

Free delivery - Wed, Jan 14

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Part no. 6809050

BMW F20 F30 Rear Electronic Module REM Fuse Box Control Unit V2 ECU 6809050

€23.95

Free delivery - Wed, Jan 14

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Part no. 9305736

BMW X1 E84 ECU Body Control Module Junction Box H2 PL2RR JBBFE IIIR 9305736

€61.95

Free delivery - Wed, Jan 14

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Part no. 5F4035225

Seat Leon Mk3 Antenna Amplifier Module AM/FM Left N/S Aerial Booster 5F4035225

€42.95

Free delivery - Wed, Jan 14

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Part no. 5G6867657

Volkswagen Golf 5G Mk7 Rear Lamp Light Bulb Cover Left N/S 5G6867657

€23.95

Free delivery - Wed, Jan 14

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Part no. A0009062103

Mercedes W205 Alternator Generator Petrol Engine Valeo 150A 14V A0009062103

€113.95

Free delivery - Wed, Jan 14

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Part no. 141951253B-3

Audi VW Volkswagen Seat Relay Number 53 Unit Module 4 Pins Set Of 2 141951253B

€23.95

Free delivery - Wed, Jan 14

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Part no. 8T0971035A

Audi A5 8T Coupe Front Door Wiring Loom Harness Driver's Side 8T0971035A

€23.95

Free delivery - Wed, Jan 14

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Part no. 070903327C

Volkswagen Touareg Transporter 2.5TDI Alternator Coupling Sleeve Belt 070903327C

€23.95

Free delivery - Wed, Jan 14

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Part no. A4145400130

Mercedes-Benz Vaneo W414 Cable Starter Line Positive Line Battery A4145400130

€23.95

Free delivery - Wed, Jan 14

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Part no. 03G906016GJ-1

Volkswagen Golf V 1K 2.0 SDI BDK 75HP Engine Control ECU Kit 03G906016GJ Manual

€132.95

Free delivery - Wed, Jan 14

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Part no. 8608020

Gearbox Module Mini F55 F56 F57 Automatic Basic Control Unit EGS 8608020

€256.95

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Part no. 5Q0959592E

Audi A3 8V Front Door Module Control Unit Module Right O/S ECU 5Q0959592E

€23.95

Free delivery - Wed, Jan 14

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Part no. 8573258-10

Engine Control Unit BMW F20 116d F30 316d N47N 116HP ECU DDE 8573258 Manual

€32.95

Free delivery - Wed, Jan 14

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Part no. A2078202910

Seat Control Module Mercedes A207 W207 Cabrio Rear Control Unit ECU A2078202910

€28.95

Free delivery - Wed, Jan 14

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Part no. 9810737980

Citroen Relay 35 L Fuel Pump Carrier Bracket Holder Housing 9810737980

€28.95

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Part no. 8632687

BMW i3 I01 Engine Motor Sensors Module Wiring Cable Wire Harness 8632687

€23.95

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Part no. A9079003207

Mercedes W907 Air Suspension Level Control Unit Module Airmatic A9079003207

€142.95

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Part no. 3421562

Engine Wiring Harness BMW X3 E83 2.0i N46 Wiring Loom Manual Gearbox 3421562

€47.95

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Part no. 8512499-4

BMW E87 E90 LCI N47 118d 318d Diesel ECU Kit DDE 8512499 CAS3 + Keys Automatic

€256.95

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Part no. 8580061

BMW F40 F48 Mini F55 F56 Battery Starter Cable Wiring Loom B47B B47D 8580061

€23.95

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Part no. 7798482

BMW E60 E61 Battery Alternator Cable Lead For Preheater System 7798482

€23.95

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Part no. 7615308

BMW F20 F21 F30 Petrol N13 Wiring Loom Harness Engine Gearbox Manual 7615308

€23.95

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Part no. 8P4971693P

Audi A3 8P Door Wiring Harness Loom Rear Left Right N/O/S Cabling 8P4971693P

€23.95

Free delivery - Wed, Jan 14

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Part no. 9339274

CAS4 Module BMW F01 F07 F10 F11 F12 X3 F25 Key Reading Control Unit 9339274

€66.95

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Part no. MB3G-12C550-CG

VW Volkswagen Amarok Mk2 Glow Plug Relay Unit Module ECU MB3G-12C550-CG

€256.95

Free delivery - Wed, Jan 14

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Part no. A6519003701-2

Mercedes W212 Engine ECU Module Wiring Loom Harness Socket OM651 A6519003701

€23.95

Free delivery - Wed, Jan 14

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Part no. 5Q0971230DT

Volkswagen Golf Mk7 Alternator Wiring Harness Loom Cable 1.4 TSI 5Q0971230DT

€23.95

Free delivery - Wed, Jan 14

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Part no. 4M0035454B

Audi A4 B9 Dashboard Loudspeakers Tweeter Speaker Front 4M0035454B

€28.95

Free delivery - Wed, Jan 14

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Part no. A1669003309

Mercedes W176 W204 W246 Headlight Headlamp Range Control Unit Module A1669003309

€42.95

Free delivery - Wed, Jan 14

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Part no. 7394651

BMW 5 F11 Touring Rear Boot Trunk Lid Tailgate Control Unit Module ECU 7333928

€23.95

Free delivery - Wed, Jan 14

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Part no. A2059008826

Mercedes C205 SAM Module Rear Comfort Control Unit ECU A2059008826

€28.95

Free delivery - Wed, Jan 14

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Part no. A2139068701

Mercedes W205 W213 Fuse Box Rear SAM Module Electrical Fuse Unit A2139068701

€56.95

Free delivery - Wed, Jan 14

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Part no. A2475451000

Mercedes W177 W247 Battery Bracket Battery Mount Holder Trim A2475451000

€23.95

Free delivery - Wed, Jan 14

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Part no. A2135407744

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

€47.95

Free delivery - Wed, Jan 14

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Part no. 8R0035223F

Audi A4 B8 A5 8T Stereo Radio Sound System Speaker Amp Amplifier 8R0035223F

€28.95

Free delivery - Wed, Jan 14

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Part no. 6923945

BMW 5 6 SERIES E60 E60N E61 E61N E63 B terminal point engine compartment 6923945

€28.95

Free delivery - Wed, Jan 14

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Part no. 8605144

BMW F20 F21 LCI F23 F30 F32 F33 Engine Wiring Loom Harness Cable 8605144

€56.95

Free delivery - Wed, Jan 14

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Part no. 9354289

BMW F45 F46 Mini F60 Sensor For Pedestrian Protection PTS Control Unit 9354289

€104.95

Free delivery - Wed, Jan 14

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Part no. A2049009410

Mercedes W204 CD Player Radio Stereo Navigation Sat Nav Head Unit A2049009410

€61.95

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Part no. A2059006213

Mercedes W205 Rear Door Module Control Unit ECU Left N/S A2059006213

€23.95

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Part no. 4M0971228DH

Audi Q7 4M Q8 Mk1 Starter Motor Wiring Harness Cable Line 4M0971228DH

€113.95

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Part no. 5L0051236H

Skoda Yeti 5L Octavia III Card Map Sat Navi Navigation Europe 2015 5L0051236H

€23.95

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Part no. P1XT-18T806-AC

Volkswagen VW Amarok NF Audio Sound System Amplifier Unit P1XT-18T806-AC

€66.95

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Part no. A2129007124

Mercedes W212 Fuse Box SAM Control Module Unit ECU A2129007124

€32.95

Free delivery - Wed, Jan 14

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Part no. A2710106644-2

Mercedes R171 SLK200 M271.944 163HP Engine Control ECU Kit A2710106644 Key Lock

€237.95

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Part no. 8V3971035A

Audi A3 S3 8V 3D Door Wiring Harness Loom Cable Driver's Side 8V3971035A

€23.95

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Part no. A2229055804

Mercedes CLA C117 W176 W205 Aerial Antenna Amplifier Unit A2229055804

€23.95

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Part no. A2059003222

Door Module Mercedes W205 W253 Control Unit Module Front Right O/S A2059003222

€37.95

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Part no. 130002618

BMW X3 X5 E53 E83 Front Seat Adjustment Actuator Drive CRH 1-1968-01

€23.95

Free delivery - Wed, Jan 14

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Part no. A1695450001

Mercedes-Benz A B Class W169 W245 Fuse Box Relay Module Unit A1695450001

€23.95

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Part no. A2129008224

Headlight Control Module Mercedes W207 W212 Unit A2129008224

€85.95

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Part no. 7E0907652A

Audi TT 8J ESP YAW Rate Lateral Acceleration Speed Sensor 7E0907655A

€23.95

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Part no. 7464634

BMW X1 F48 Control Unit Remote Backrest Unlocking 7464634

€23.95

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Part no. A2135409916

Earth Ground Cable Mercedes W213 S213 Battery Wiring Loom Engine A2135409916

€23.95

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Part no. A4209003305

Mercedes Sprinter W907 W910 Radio Stereo Player Head Unit Module A4209003305

€222.95

Free delivery - Wed, Jan 14

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Part no. 6819329

KaFAS Camera BMW i3 I01 F10 F20 F30 LCI Speed Control ECU Module Unit 6819329

€28.95

Free delivery - Wed, Jan 14

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Part no. 038907281B

Audi A6 C6 2.0 TDI Glow Plug Relay Unit Control Module 038907281B

€28.95

Free delivery - Wed, Jan 14

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Part no. 9154331

BMW MINI Clubman R55 Cable Wiring Loom Splitdoor Split Door Rear Right O/S

€23.95

Free delivery - Wed, Jan 14

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Part no. 7520933

Mini Cooper One W10 R52 Wiring Harness Loom Engine 7520933 7531839 7514274

€28.95

Free delivery - Wed, Jan 14

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Part no. 7599881-1

BMW E87 LCI E90 E91 118i 318i Petrol N43 143HP ECU KIT DME 7599881 CAS3 + Key

€170.95

Free delivery - Wed, Jan 14

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Part no. 9149835

BMW X5 E70 Front Seat Control Unit Module Driver's Side 9149835

€56.95

Free delivery - Wed, Jan 14

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Part no. A0025428819-1

Mercedes W176 W246 Relay Current 4 Pin 12V Hella A0025428819 Set x2

€23.95

Free delivery - Wed, Jan 14

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Part no. A1779008103

Mercedes W177 W247 Telematics Module Communication Control Unit A1779008103

€66.95

Free delivery - Wed, Jan 14

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Part no. P1WT-14H076-CGG

VW Volkswagen Amarok Mk2 Control Unit Module ECU P1WT-14H076-CGG

€450.95

Free delivery - Wed, Jan 14

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Part no. BK21-12B681-AA

Ford Transit Custom Mk8 Glow Plug Relay Unit 2.2 Diesel BK21-12B681-AA

€23.95

Free delivery - Wed, Jan 14

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Part no. 4E0907719

Audi A8 S8 D3 Alarm Module Tow Protection Signal Control Unit Block 4E0907719

€23.95

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Part no. 8621190

BMW F20 F22 F30 LCI Electric Line Cable Power Distribution Module 8621190

€23.95

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Part no. 8T0959793K

Audi A4 B8 A5 8T Door Control Unit Module Front Driver's Side 8T0959793K

€23.95

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Part no. 4L0035670

Audi Q7 4L Multimedia Stereo Sat Nav SD CD Player Radio Head Unit 4L0035670

€199.95

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Part no. A1645407901

Mercedes V251 Gateway Module Control Unit ECU A1645407901

€80.95

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Part no. 8518568

BMW F20 F30 F32 120d 320d 420d Diesel N47N 184HP Engine Control ECU DDE 8518568

€37.95

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Part no. 9301522

BMW F01 F02 F07 F10 F11 CAS4 Control Unit Key Reading Module 9301522

€113.95

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Part no. 9270495-1

BMW X5 E70 X6 E71 F10 F11 F12 Parking Sensor PDC Ultrasonic Black 9251944 SET X4

€37.95

Free delivery - Wed, Jan 14

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Part no. A1779008206

Mercedes W177 Ambience Illumination Light Control Module Unit A1779008206

€37.95

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Part no. 8602802

BMW i3 I01 Hybrid Rex Engine Wiring Cable Harness Bracket Mount Trim 8602802

€23.95

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Part no. A2055406304

Mercedes W205 Hybrid Battery Cable Starter Wiring Loom Harness A2055406304

€32.95

Free delivery - Wed, Jan 14

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Part no. 6911003

BMW 1 3 X1 X3 X5 X6 SERIES E81 E82 E84 E87 E88 E90 Accelerating Sensor 6911003

€23.95

Free delivery - Wed, Jan 14

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Part no. 9168336

BMW X1 E84 Diversity Aerial Antenna Amplifier DAB 9168336

€37.95

Free delivery - Wed, Jan 14

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Showing 991-1089 of 12466 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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