Car electrical relays
More informationAt Global Parts, we offer a wide selection of original used car parts, including relays for many popular car brands such as BMW, Mini, Mercedes, Audi, Volkswagen, and others. The relays we offer undergo quality control to ensure you receive a top-quality product.
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Part no. 6915327-1
BMW E46 E60 E81 E87 E90 E91 F10 F20 F30 2x Relay Make Contact Sky Blue 6915327
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 6G9T-14B192-EA
Ford Fiesta Transit Relay 4-Pin Grey FoMoCo Unit 6G9T-14B192-EA
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 1388911
BMW E36 E38 E21 E85 R52 R57 Change-Over Contact Relay Violet 1388911
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 8D0951253A
Audi A6 C6 Multi Use Relay Unit Module 4 Pins 373 8D0951253A
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 1742690
BMW E60 E63 E87 E90 Relay Changer Make Contact Salmon Red 1742690
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0025421119
Mercedes W163 W168 W203 W211 Relay 4-Pin Black Hella A0025421119
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 8373700-2
BMW E60 E63 E87 E90 E91 4X Relay Make Contact White Green Set 8373700
Promo price
€25.95
€24.65
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 191906383C
Audi VW Volkswagen Seat Relay Unit Module 4 Pins 191906383C
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-15%
Part no. 7640508-2
BMW 1 3 4 Series F20 F21 F30 F31 F32 F33 Cooling Fan Control Unit Radiator
Promo price
€32.95
€28.01
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 6915327
BMW E46 E39 E60 E81 E87 E90 E91 F10 F20 F30 Relay Make Contact Sky Blue 6915327
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0025422519
Mercedes W168 W169 W245 Blue Relay 4-Pin Tyco A0025422519
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 8373700
BMW E60 E63 E87 E90 E91 Relay Make Contact White Green 8373700
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 1472984-2
Mini R50 R52 R53 R55 R56 R57 R58 R59 R60 5-Pin Black Relay Wiper Set 1472984
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 038907281D-1
Genuine VW Audi Seat Skoda Diesel Glow Plug Relay Unit Black 038907281D
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0025428919
Relay Mercedes W176 W246 5-Pin Yellow Hella 12V A0025428919
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0025428819-1
Mercedes W176 W246 Relay Current 4 Pin 12V Hella A0025428819 Set x2
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 8353447
BMW E36 E38 Relay Two Pole Make Contact 8353447
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 8W0970599
Audi A4 B9 Q6 FY Glow Plug Control Relay 2.0 TDI Diesel 8W0907599
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 1388911-1
BMW E36 E38 E85 Mini R52 R57 2x Change-Over Contact Relay Violet Set 1388911
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 7M0951253C
Volkswagen T5 Audi Seat Skoda Relay Black Control Unit 5 Pin 12V 7M0951253C
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-15%
Part no. A0009821923-1
Mercedes W205 Interior Trunk Fuse Box Automotive Pink Relays Set A0009821923
Promo price
€28.95
€24.61
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 4H0951253C-1
Volkswagen Polo 6R Tiguan 1T Multi Use Control Module Relay SET 4H0951253C
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 899543000
Porsche Boxster 986 A/C Air Conditioning Relay Control 12V 10A 899543000
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. Q0009857V001
Smart Roadster W452 Heated Seat Control Relay Module 9 Pin Black Q0009857V001
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 443937105B
VW Volkswagen Audi Skoda Seat Little Fuse Amp 30A 12V 443937105A
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 4D0907131
Audi VW Volkswagen Seat Relay Unit Module 4 Pins 12V 4D09907131
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 7M0951253A
Audi VW Volkswagen Seat Relay Unit Module 4 Pins 7M0951253A
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. A0035422319
Mercedes W176 W246 Relay Battery Decoupling 12V A0035422319
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. BJ32-14B192-CA
Range Rover Evoque L538 Brown Relay 40 AMP BJ32-14B192-CA V23134-B152-X514
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 443937105A
VW Volkswagen Audi Skoda Seat Little Fuse Amp 30A 12V 443937105A
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0009822523
Mercedes W156 W242 W246 W447 Relay 4-Pin Black Hella A0009822523
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0035421619-1
Mercedes W177 Relay 052 Fuse Box Relay Slot B D E 70A Tyco SET X2 A0035421619
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0009822923
Mercedes W177 W205 W247 Relay Fuse Unit Module 4 Pins Grey A0009822923
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 6G9T-14B192-CA
Ford Fiesta Transit Relay 4-Pin Black FoMoCo Unit 6G9T-14B192-CA
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 141951253B
Audi VW Volkswagen Seat Relay Unit Module 4 Pins 141951253B
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-15%
Part no. 8373700-3
BMW E60 E63 E87 E90 E91 5X Relay Make Contact White Green Set 8373700
Promo price
€28.95
€24.61
Free delivery: May 20 – 25
If paid before 14:00
-15%
Part no. 24435922
GM Vauxhall Opel Relay 4-Pin Multi Use Glow Plug Unit Black Set 24435922
Promo price
€28.95
€24.61
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 1393415
BMW 3 5 7 Series E36 E38 E90 E91 F10 F11 Change-Over Contact Relay Grey 1393415
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 3M5J-14A672-BA
Ford Kuga C394 Towbar Relay Control Unit Module 3M5J-14A672-BA
€42.95
Free delivery: May 20 – 25
If paid before 14:00
-15%
Part no. A7899823500
Mercedes EQA H243 Engine Relay 20A ECU A7899823500
Promo price
€51.95
€44.16
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 6G9T-14B192-AA
Ford Mondeo Transit Relay 4-Pin Black FoMoCo Unit 6G9T-14B192-AA
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 8K0951253-1
Audi VW Volkswagen Seat Relay 643 Unit Module 4 Pins Set X2 8K0951253
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 4FO903291
Audi A6 C6 2.0 TDI Relay Condenser 4FO903291
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-15%
Part no. 1K0951253-2
VW Volkswagen Audi Seat Relay 449 12V 30A Unit Module 4 Pins 1K0951253 X2
Promo price
€28.95
€24.61
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0035421619
Mercedes W177 Relay 052 Engine Fuse Box Relay Slot B D E 70A Tyco A0035421619
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 4H0951253A-1
Seat Skoda Audi VW Polo Multi Use Control Relay 4 Pin 645 4H0951253A SET X2
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0025429319
Mercedes C117 W166 W176 W205 X253 Relay Black Control Unit 4 Pin 12V A0025429319
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 0332019103
Porsche Cayman 987 Relay Bosch 12v 0332019103
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-15%
Part no. V23134-B52-X477
Porsche Cayman 987 Boxster Air Conditioning Control Relay V23134-B52-X477
Promo price
€37.95
€32.26
Free delivery: May 20 – 25
If paid before 14:00
Part no. 8D0951253-1
Audi A4 B6 B7 B8 Q7 4L A6 C7 A8 D4 Multi Use Relay Unit Module 4 Pins 8D0951253
€23.95
Free delivery: May 20 – 25
If paid before 14:00
Part no. 8D0951253-2
Audi Q7 4L Relay Unit Module 4 Pins Number 370 Set Of 2 8D0951253
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A1695458140
Mercedes W169 W245 Relay Control Unit Bracket Mount Holder Cover A1695458140
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0035420219
Relay Mercedes W639 W906 5-Pin Black 12A A0035420219
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 1H5951253
Volkswagen Touareg 7L Relay Alternator Alarm Black 4 Pin 12V No 143 1H5951253
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 7700844253
Renault Relay Module Control Unit Yellow 12V 40A 5 Pins 7700844253
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0035420219-2
Mercedes W639 W906 Relay 5-Pin Control Unit 12A Blue SET X2 A0035420219
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0035455005
Mercedes W202 W210 Kick Down Kickdown Relay Electrical Module Unit A0035455005
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 6977982
Mini Cooper R50 R56 R57 R60 Relay No Contact Taubenblau 6977982
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 90494959
GM Vauxhall Opel Relay 4-Pin Multi Use Glow Plug Unit Magenta 90494959
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 5M5T-14B192-BA
Land Rover Discovery 4 L319 Multi Use Control Module Relay 5M5T-14B192-BA Black
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 8366282-1
BMW Z1 Z3 E32 E36 E38 E46 X5 E53 Connection Plug Golden Brown Set x2 8366282
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 7H0943383
Volkswagen Transporter T5 Relay Black Control Unit 5 Pin 12V 472 7H0943383
€23.95
Free delivery: May 20 – 25
If paid before 14:00
Part no. 5M5T-14B192-EA-2
Ford Mondeo Focus Multi Use Grey Relay 12V 70A 4 Pin 5M5T-14B192-EA
€23.95
Free delivery: May 20 – 25
If paid before 14:00
Part no. PEO118811
Mazda 6 GJ Relay 4-Pin Electrical Unit Multi-Purpose Relay Black ACVN51212
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. UM4667730
Mazda 6 GJ NAIS Relay Electrical Unit Module 4 Pin 12V Black UM46-67-730 Set x2
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 99361810400
Porsche Carrera 996 Rear Wiper Motor Relay Unit Black 12V 99361810400
€42.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 1742690-1
BMW E60 E81 E87 E90 E91 X3 E83 Relay Changer Make Contact Salmon Red Set 1742690
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 4H0951253A
Seat Skoda Audi VW Polo 6R Multi Use Control Module Relay 4 Pin 645 4H0951253A
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. V23134-J59-X431
Mazda 6 GJ TYCO Relay Black Unit Module 4 Pin 12V V23134-J59-X431
€23.95
Free delivery: May 20 – 25
If paid before 14:00
Part no. 6919113-1
BMW E81 E82 E87 E88 E90 E91 E92 E93 F10 F11 F12 Black Relays 5 Pin Set 6919113
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-40%
Part no. A1408207126
Mercedes C140 Blinker Hazard Trailer Relay Module Control Unit A1408207126
Promo price
€227.95
€136.77
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 141951253B-1
VW Volkswagen Audi Seat Skoda Relay Unit 4 Pins 12V 40A 141951253B
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 4H0951253C
Seat Skoda Audi VW Polo 6R Multi Use Control Module Relay 4 Pin 646 4H0951253C
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 6901469-2
3X Relay BMW E60 E87 E90 F10 F30 4 Pin Tyco Set Black 6901469
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 8Z0951253
Skoda Octavia II 5 Pin Black Relay Control Module Unit Set Kit 8Z0951253
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 8E0907307C
Audi RS4 B7 4.2 Servotronic Relay Control Unit 8E0907307C
€70.95
Free delivery: May 20 – 25
If paid before 14:00
Part no. FU5T-14B192-AA
Ford Transit Mk8 Relay 5-Pin Blue FoMoCo FU5T-14B192-AA 4RC933364
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 8507398
Glow Bracket BMW E60 E87 LCI E90 E91 E92 F10 F11 N47 Diesel Relay Plug 8507398
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. GU5T-14B192-GA
Ford Transit Mk8 Relay High Power 4-Pin Black FoMoCo GU5T-14B192-GA 4RA933714
€23.95
Free delivery: May 20 – 25
If paid before 14:00
Part no. 5M5T-14B192-EA-1
Ford Transit Custom Relay 4-Pin Black 12V 40A FOMOCO Set X2 5M5T-14B192-EA
€23.95
Free delivery: May 20 – 25
If paid before 14:00
Part no. 6901469-1
2X Relay BMW E60 E87 E90 F10 F30 4 Pin Tyco Set Black 6901469
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0035420419
Mercedes W177 W205 W247 Relay Fuse Unit Module 4 Pins Black A0035420419
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 4H0951253-1
Audi A3 8P Multi Use Control Module Relay 4 Pin Light Green Unit Set 4H0951253
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 8K0951253
Audi VW Volkswagen Seat Relay 643 Unit Module 4 Pins 8K0951253
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0025421419-1
Relay Mercedes W163 W169 W203 W210 Relay Unit 5-Pin Yellow Tyco A0025421419
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0035420219-3
Mercedes W639 W906 Relay 5-Pin Control Unit 12A Blue A0035420219
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 1472984-1
Mini R50 R52 R53 R55 R56 R57 R58 R59 R60 5-Pin Black Relay Wiper Set 1472984
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 3D0951253A
VW Volkswagen Audi Seat Skoda Relay Black 5 Pins 12V 50A Set 433 3D0951253A
€23.95
Free delivery: May 20 – 25
If paid before 14:00
Part no. 141951253B-4
Audi VW Volkswagen Seat Relay Number 53 Unit Module 4 Pins Set Of 4 141951253B
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 1472984-3
Mini R50 R52 R53 R55 R56 R57 R58 R59 R60 5-Pin Black Relay Wiper Set 1472984
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0035421019
Relay Mercedes C117 GLA X156 ML W166 W176 W246 5 Pins Yellow A0035421019
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. DH22-14B192-AA
Land Rover Discovery Sport L550 Relay 4-Pin 20A 12V Unit Black DH22-14B192-AA
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. DH22-14B192-BA
Land Rover Discovery Sport L550 Relay 4-Pin Unit 12V 20A Black DH22-14B192-BA
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. DH22-14B192-EA
Land Rover Discovery Sport L550 Relay 4-Pin Unit 12V 70A Grey DH22-14B192-EA
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. A0035423019-1
Power Relay Control Mercedes W176 W246 Module 4 Pin 12V 20A SET A0035423019
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Part no. 7M0951253C-2
VW Touareg 7L Audi Q7 4L Relay Black Control Unit 5 Pin 404 12V Set 7M0951253C
€23.95
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 141951253B-2
VW Volkswagen Audi Seat Skoda Relay Unit 4 Pins 12V 40A 141951253B
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
-15%
Part no. A2469052602
Dashboard Panel Mercedes W176 W246 Switch Dynamic Select Start/Stop A2469057902
Promo price
€32.95
€28.01
Free delivery: May 20 – 25
If paid before 14:00
-5%
Part no. 191906383C-1
Audi VW Volkswagen Seat Skoda Relay Unit Module 4 Pins 191906383C
Promo price
€23.95
€22.75
Free delivery: May 20 – 25
If paid before 14:00
Electrical relays for stable vehicle electrical system performance
Stable and reliable relays for the car's electrical system
Relays are key components of a vehicle's electrical system, controlling the flow of current to various electrical devices, such as lights, fans, fuel pumps, and air conditioning systems. Relays allow for the control of high electrical loads using low-voltage signals, ensuring the smooth operation of vehicle systems. At Global Parts, you'll find a wide selection of used car parts, including relays, perfectly matched to brands like BMW, Audi , Mercedes, Volkswagen, Mini, and more .
What is an electrical relay and how does it work in practice?
An electrical relay is an electromechanical or solid-state control element that acts as a switch activated by a low-current signal. In the classic 12V automotive design, it consists of an electromagnetic coil, a core, a movable contact (armature), and a set of operating contacts (NO – normally open or NC – normally closed). When a control voltage (usually 12V) is applied, the coil generates a magnetic field that closes or opens the power circuit. In practice, this means the ability to control devices drawing 20A, 30A, or even 70A using a signal with a load of 0.1–0.2A. This represents a significant saving for the control system and components such as switches, comfort modules, and ECUs. In modern vehicles, relays work with BCM modules and CAN systems, ensuring precise adjustment of the operating parameters of the entire system.
What functions do relays perform?
Relays play a key role in many vehicle electrical systems:
- High Load Switching – Controls high-power electrical devices, minimizing the risk of system overload.
- Electrical System Protection – Reduces load on control circuits, protecting against surges and overloads.
- Remote control – Allows devices to be turned on and off using control signals.
- Optimizing system performance – Relays ensure electrical systems operate efficiently and without disruptions.
Types of relays and their technical parameters
There are several basic types of relays used in automotive installations:
| Relay type | Characteristic | Typical parameters | Application |
|---|---|---|---|
| Electromechanical | Classic design with mechanical contacts and an electromagnetic coil | 12V / 24V, 20–70A | Fuel pump, radiator fan, heater |
| Mini / Micro ISO | Compact housing compliant with ISO standards | 12V, 20–30A | Low beam, horn, module control |
| Time relay | Switching on with time delay (adjustable) | 12V, adjustable 1–30 sec. | Interior lighting, heated windows |
| Solid State Relay (SSR) | No mechanical components, quick switching | 12V, high switching frequency | Electronic systems, ECU controllers |
The most common contact markings are: 30 (power supply), 85 and 86 (coil), 87 (NO contact), 87a (NC contact). Relay matching should take into account voltage compatibility (12V in passenger cars, 24V in trucks), maximum operating current and contact configuration.
Why is it worth taking care of relays ?
A faulty relay can lead to problems with the operation of electrical devices and reduce the reliability of the vehicle's electrical system. Typical symptoms include:
- Electrical devices not responding – Lights, fans or fuel pumps do not work despite components being functional.
- Erratic operation – Devices turn on and off randomly.
- No control signal – A damaged relay does not transmit current to the controlled device.
- Relay overheating – May indicate overload or internal damage. If you need a replacement, you'll find the right used car parts at Global Parts that will restore full functionality to your electrical system.
Symptoms and relationships with other installation elements
In practice, an electrical relay interacts directly with fuses, control modules, temperature sensors, and the wiring harness. For example, the fuel pump relay in many BMW and Volkswagen models only activates after receiving a signal from the crankshaft position sensor. In the case of the radiator fan, the relay responds to a signal from the coolant temperature sensor (usually at 92–105°C). Correctly matching parameters (e.g., 40A instead of 30A in the fan circuit) ensures stable operation, optimizes current flow, and reduces voltage drops. This is also important when upgrading LED lighting or installing additional accessories, where load compatibility is crucial.
How to choose the right relays ?
When selecting relays, there are several key aspects to consider:
- Vehicle-specific fit – Every electrical system has its own specific technical requirements. At Global Parts, you'll find relays perfectly matched to BMW, Audi, Mercedes, Volkswagen, Mini, and more .
- Electrical Parameters – Check operating voltage, maximum current and control circuit specifications.
- Technical condition – Used relays should be fully functional and free from signs of overheating or mechanical damage.
Step-by-step relay matching procedure
- Check the installation voltage (usually 12V).
- Verify the maximum current of the device (e.g. radiator fan 25-40A).
- Specify the contact configuration (NO/NC).
- Adjust the case size (Mini ISO, Micro ISO).
- Compare pin designations (30/85/86/87). This approach allows for full compatibility with the electrical system and ensures correct installation without the need to modify the wiring harness.
Why choose used relays ?
Used car parts, such as used relays, are an economical solution that allows you to save money while maintaining high quality. By choosing used electrical components, you benefit from:
- Lower costs – Used relays are much cheaper than new ones, but offer just as high quality.
- Ecology – Recycling parts supports environmental protection and reduces waste.
- A wide range of products – In our store you will find used relays to the most popular car brands.
How to take care of relays ?
To ensure that the relays function reliably for a long time, it is worth following a few rules:
- Regular inspection – Check the condition of relays during technical inspections.
- Clean connections – Keep connectors and wires in good condition to avoid interruptions in current flow.
- Avoid overloads – Use relays with appropriate parameters for the given electrical system.
- Replace on time – Damaged or worn relays should be replaced to prevent problems with the operation of electrical equipment. If you need a replacement, Global Parts has the right used car parts to ensure the reliability and durability of your electrical system.
FAQ - Frequently asked questions about electrical relays
| Question | Answer |
|---|---|
| What is an electrical relay? | It is a control element that allows you to turn on high-power devices using a low-voltage signal, usually 12V. |
| How does a relay work in a car? | When voltage is applied to the coil, a magnetic field is created that closes the contacts and allows current to flow to a device, such as a fuel pump. |
| What are typical relay parameters? | Most often 12V and a load capacity of 20A, 30A, 40A or 70A depending on the application. |
| Does the relay affect the operation of the LED lights? | Yes, proper relay matching improves voltage stability and eliminates lighting interference. |
| How to check relay compatibility? | The voltage, operating current and pin configuration must be matched to the specific car model. |
| Does the relay work with the fuse? | Yes, the fuse protects the circuit from overload and the relay controls the current flow. |
Summary: Relays at Global Parts Automotive Store
Relays are essential components of the electrical system that control the operation of many devices in your vehicle. By maintaining their technical condition, you can ensure the reliability of your electrical system and the safety of your vehicle. 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 , and more, 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 .