Car Electrical Relay Switch

Whenever you operate a switch to an accessory in your car that carries a lot of current such as the lights wipers or horn you run a small amount of current through a relay which in turn closes contacts to operate the accessory.

Car electrical relay switch.

We show you how to wire in an electric fan relay kit with a thermostatic switch. If something were to fail and short the chances of an interior fire are significantly reduced if a relay is utilized to allow the higher voltage switching occur in the engine compartment. They employ an electromagnet device to mechanically switch and make or break an electrical circuit the type most commonly used in the auto industry is called a standard relay or a mini relay. An automotive relay is an electronically operated switch.

Using a relay keeps the higher voltage out of the passenger compartment of the vehicle and is just less taxing on your vehicle s electrical system in general. If the relay clicks and the circuit is still not. A 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. Although there are various relay designs the ones most commonly found in low voltage auto and marine applications are electro mechanical relays that work by activating an electromagnet to pull a set of contacts to make or break a circuit.

They are found in all types of vehicles. If one of your accessories doesn t come on and you suspect the relay is bad you can perform a few simple tests. Step 4 once the relay has been identified gently grasp or touch the relay in question have a helper turn the ignition key to the on position then crank the engine over the relay should click in one of the ignition switch positions. Relays are used where it is necessary to control a circuit by an independent low power signal.

If you ve got an electric cooling fan on your classic car or hot rod and you want to know how to wire it with a. A relay is essentially a switch that is operated electrically rather than mechanically. If so the trigger circuit of the relay electrical system is working if not continue to next step. Online led store 6 pack bosch style 5 pin 12v relay kit interlocking harness socket holder 14 awg hot wires spdt 30 40 amp 12 volt automotive relays for auto fan cars by online led store 12 45 12.