Automotive relay wiring method

Update:13-04-2019
Summary:

The relay has a four-leg relay and a five-leg relay. Le […]

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 electromagnetic coil at the ends of the relays 1, 2, the three ends are combined with the four ends.
The car four-leg relay is divided into 4 lines of 85 / 86 / 87 / (30A / 87A). The 85/86 two are the speaker control line, the 85 is connected to the positive pole of the control line, and the other terminal of the 86 grounded iron speaker, regardless of the positive and negative poles. 87 is connected to the positive pole of the battery, and 30A/87A is connected to the positive line of the appliance to be controlled.
The two-legged relay of the car is the coil power supply, and the other three feet are normally open and normally closed. Generally, there is an electric shock diagram on the relay, which can also be detected by a multimeter. Generally, the middle of the three legs is the common terminal of the output contact, and the other two pins are the coil. One end of the two legs is the normally open and normally closed contacts of the output, and the common terminal is normally open, and the common terminal is normally closed. Five feet can disconnect the original line and connect to other lines at the same time. According to their respective needs, the five feet can be used instead of four feet.

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