Relays act as electrical switches, using a small control current to open or close a much larger circuit — powering everything from fuel pumps and cooling fans to headlights and starters. A stuck or failed relay can leave a component running constantly, clicking without engaging, or not turning on at all, and is one of the most overlooked causes of an intermittent electrical fault. Browse replacement relays for cars, trucks, and SUVs to restore reliable switching to the circuits that depend on them.
