Moto audio effects apkA relay is an electrically operated switch.It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.. Relays are used where it is necessary to control a circuit by an independent low-power signal ...La cumparsita pianoDepending on the vehicle it could either be the relay box to convert the canbus type vehicle lighting signals to traditional analogue signals for the trailer wiring, or possibly the flasher relay that controls the rate of indicator flashing when the additional trailer indicator load is sensed. Do a google search for 12V AFC module and there are ...