Relays For Cars. How they work is by a wire wound magnetic coil that when excited by a electric current, moves a mechanical spring contact inside the relay, completing a circuit. 2x dc 12v 40a 40 amp car auto automotive van boat bike 4 pins spst alarm relay $11.95 5pcs relay switch 5pin harness socket waterproof 40a 12vdc 16awg automotive car
Relays are located throughout the entire vehicle. 4.6 out of 5 stars. Most car systems run off of a 12v battery.