The Engine Wiring Harness Relay is used in electrical and electronic circuits to control a larger electrical load or current using a smaller control signal. It serves as a switch that is operated electrically, allowing the control of one circuit by another circuit that might be isolated from it or have different voltage levels.Attributes:• Longer life expectancies• Noise suppression• Rapid switchingApplications: The Engine Wiring Harness Relays are electromechanical switches that are operated by an electrical signal to control the flow of current in another circuit.