Is there a relay for turn signals?

Turn signals in most vehicles do not require a traditional relay because they operate on low electrical current. The system typically uses a flasher relay (or “blink relay”), which is a specialized component that interrupts power to the turn signal bulbs at a set interval, creating the blinking effect. This flasher relay differs from a standard relay, which is used to manage higher-current loads in other vehicle systems.

In some cases, however, a power relay may be added to turn signal circuits, especially in modified or high-demand setups. This can occur when:
- Extra turn signal lights (e.g., third-brake lights or aftermarket LEDs) increase the total current draw.
- The factory flasher relay is prone to failure due to excessive load.
- Custom wiring or electrical upgrades require distributing power more efficiently.

To identify if a relay is part of your turn signal system, check the vehicle’s wiring diagram. If your turn signals dim, stay on continuously, or fail to work, the issue may stem from a faulty flasher relay, burnt bulbs, or wiring problems. Always consult a professional if diagnosing electrical faults, as incorrect repairs can damage the entire lighting system.