Relays are electrically operated switches that help in controlling a circuit by providing isolation between the control circuit and the controlled circuit. They work by using an electromagnetic field to activate the switch contacts, allowing current to flow through the circuit. In this article, we will discuss the 12V relay wiring diagram 5 pin, its uses, and how to wire it properly.
What is a 12V Relay Wiring Diagram 5 Pin?
A 12V relay wiring diagram 5 pin is a diagram that shows the wiring of a 12V relay with a 5 pin configuration. The diagram provides information on how the relay is wired and how it operates. The 5 pin relay is the most common type of relay used in automotive applications. It is used to control various electrical components such as headlights, horns, and cooling fans, to name a few.
Parts of a 12V Relay Wiring Diagram 5 Pin
A 12V relay wiring diagram 5 pin consists of five main parts:
| Part | Description |
|---|---|
| Coil | It is the part of the relay that generates the magnetic field. |
| NO (Normally Open) Contact | It is the contact that is open when the relay is not energized. |
| NC (Normally Closed) Contact | It is the contact that is closed when the relay is not energized. |
| COM (Common) Contact | It is the contact that is common to both the NO and NC contacts. |
| Diode | It is a component that is used to protect the relay from back EMF (Electro-Motive Force). |
How to Wire a 12V Relay Wiring Diagram 5 Pin
Wiring a 12V relay with a 5 pin configuration is not difficult. Here are the steps:
Step 1: Identify the Pins
Identify the pins on the 5 pin relay. Typically, the pins are labeled as follows:
- PIN 85 – Connect to the positive side of the circuit that you want to control
- PIN 86 – Connect to the negative side of the circuit that you want to control
- PIN 30 – Connect to the power source (battery)
- PIN 87 – Connect to the component (headlights, horn, etc.) that you want to control
- PIN 87a – (if available) not used in most automotive applications
Step 2: Connect the Wires
Once you have identified the pins, connect the wires as follows:
- Connect the positive side of the circuit that you want to control to PIN 85
- Connect the negative side of the circuit that you want to control to PIN 86
- Connect the power source (battery) to PIN 30
- Connect the component (headlights, horn, etc.) that you want to control to PIN 87
- PIN 87a is not used in most automotive applications
Step 3: Add a Diode (Optional)
If you want to protect your relay from back EMF, you can add a diode. Connect the diode between PIN 85 and PIN 86. The striped side of the diode should be connected to the positive side (PIN 85).
FAQs
What is a relay?
A relay is an electrical switch that is operated by an electromagnet. It is used to control a circuit by providing isolation between the control circuit and the controlled circuit.
What is a 5 pin relay?
A 5 pin relay is a type of relay that has five pins. Pins are used for connecting the relay to a circuit. The 5 pin relay is the most common type of relay used in automotive applications.
What is back EMF?
Back EMF (Electro-Motive Force) is a voltage that is generated when a magnetic field collapses. It can cause damage to the relay’s contacts and can also cause interference in other parts of the circuit.
What is a diode?
A diode is an electronic component that allows current to flow in one direction only. It is used to protect the relay from back EMF.
How do I know if my relay is working?
You can test your relay using a multimeter. Set the multimeter to continuity mode and touch the positive and negative leads to the appropriate pins on the relay. If the circuit is complete, the multimeter will beep. If not, the relay is not working.
Conclusion
Wiring a 12V relay with a 5 pin configuration is not difficult. However, it is important to follow the wiring diagram carefully to ensure that the relay works properly. Also, adding a diode can protect the relay from back EMF. With this guide, you should be able to wire a 12V relay with confidence and ease.
