What is the wiring method of a five-pin relay?
2 Answers
Five-pin relay wiring method: A five-pin relay has two coils, one common terminal for contacts, one normally open contact, and one normally closed contact. The coils are connected to the control voltage. When energized, the relay will pull in, the normally open contact will close, and the normally closed contact will open. The five pins are labeled A, B, 1, 2, and 3. When A and B are not energized, 1 and 2 are connected. When AB is energized, 1 and 3 are connected. Automotive relays consist of a magnetic circuit system, contact system, and reset mechanism. The magnetic circuit system is composed of components such as the iron core, yoke, armature, and coil. The contact system consists of static reeds, moving reeds, and contact bases. The reset mechanism is made up of reset reeds or tension springs.
I remember when I first replaced the car speakers, I had to connect a five-pin relay, that small switching device. It has five pins: pins 85 and 86 are the control terminals, usually connected to the ignition switch or a button, supplying 12V to activate it; pin 30 is always connected to the positive power supply, directly attached to the battery positive terminal; pin 87 outputs to high-current devices, like that new sound system I installed; and there's pin 87a, which is the normally closed terminal—if not needed, it can be left unconnected. Last time, I got the polarity wrong and nearly blew a fuse, but luckily it worked fine after reconnecting—the relay wouldn't operate if the coil pins were reversed. Remember, always turn off the power before testing, and don't let the wires tangle to prevent short circuits. Now, I use it to control various aftermarket parts, avoiding button burnout—it's quite handy.
