The relay has a four-leg relay and a five-leg relay. Let's talk about the four-leg relay. First find out which of the four pins of the car relay are the coils, and which two are the contacts that are connected as shown. The two pins are insulated between normally open contacts 3 and 4. The other two pins are coils 1 and 2. When the switch hits the solenoids at the ends of the relays 1, 2, the three ends are combined with the four ends.
Automotive relays and fuses have a common feature, both for safety, and the lack of understanding of circuit components, so some people are not very clear about the difference between the two. Everyone can distinguish in appearance, and more is not understanding the principle of action. Let me talk about the difference between car relays and fuses. An automotive relay is an electrical control device that is an electrical device that causes a predetermined step change in the controlled output quantity in an electrical output circuit when the change in the input amount (excitation amount) reaches a prescribed requirement. It has a control system (also known as an input loop) and a controlled system (also known as an output back)2019-11-21
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