Relay
An electrically operated switch controlling high-current circuits.
Relays use a small control current to activate a magnetic coil that opens or closes a larger circuit. They're used in headlights, fuel pumps, and cooling fans. Faulty relays can cause intermittent or complete system failure. Regular testing with a multimeter ensures reliability. Relays reduce wear on switches and allow efficient circuit control. Modern vehicles use solid-state relays for faster, quieter operation.
Applying This Knowledge in Practice
The diagnostic principles discussed above are commonly applied in real-world vehicle diagnostics. To put this knowledge into practice, explore professional automotive diagnostic tools designed to support system testing, fault analysis, and troubleshooting across modern vehicles.