Relay serves as a switch between the power source / battery with the device to be used, for example: horns, fog lights, headlight and power windows.
Relay has 4 feet or 5 feet. Relay 5 feet called "relay 87a" because there middle leg 87a. Four other leg is leg 30, 85, 86 and 87. There is also a relay that has four legs but no feet 87, so there are only 30 feet, 85.86 and 87a. This so-called relay termination. Relay termination is usually installed in the car alarm. Relay serves IG break the flow between the contacts to the motor starter.
"Legs 30" connected with ordinary batteries, legs 85 connected to the body / chassis car, legs 86 are connected to either the positive flow of horn or lamp cord and leg 87 will issue a positive flow. While the leg 87a is the inverse of 87, so at 30 and 85 were given electric shock body, it will issue a stun 87a. But at 86 given the stun, it will stop producing stun 87a and 87 will be issued stun.
What if want 87 issued a negative flow as well as on a car horn? His manner is quite reversed course. Legs 30 and 86 are given the mass of the body, and 85 were given electric shock. Then 87 will produce negative currents
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