If you are looking to install a horn that requires a 12V power supply, a 4 pin relay wiring diagram might come in handy. A relay is an electrically operated switch that can be used to turn on or off a circuit. It works by using a low-power signal to control a high-power output. This article will guide you through the process of wiring a horn using a 12V 4 pin relay.
What is a 4 Pin Relay?
A 4 pin relay is a type of relay that has four pins or connectors. The pins are labeled as follows:
- Pin 30 – common (C)
- Pin 87 – normally open (NO)
- Pin 85 – coil positive (+)
- Pin 86 – coil negative (-)
The common (C) pin is the center pin, and it connects to either the normally open (NO) or normally closed (NC) pin depending on the state of the relay. The coil positive (+) and negative (-) pins control the current flowing through the electromagnet inside the relay.
How to Wire a Horn Using a 12V 4 Pin Relay
The wiring diagram for a horn using a 12V 4 pin relay is as follows:
| Pin | Connection |
|---|---|
| 85 | Connect to the positive terminal of the horn relay coil |
| 86 | Connect to the negative terminal of the horn relay coil |
| 30 | Connect to the battery positive terminal |
| 87 | Connect to the positive terminal of the horn |
Here are the steps to follow when wiring a horn using a 12V 4 pin relay:
Step 1: Identify the Horn and Relay
Firstly, identify the horn and the relay that you will be using. Ensure that the horn requires a 12V power supply and that the relay is a 4 pin relay. You can find these parts at your local auto parts store or online.
Step 2: Connect the Wiring
The second step is to connect the wiring as shown in the wiring diagram above. Connect the pins as follows:
- Pin 85 – Connect to the positive terminal of the horn relay coil
- Pin 86 – Connect to the negative terminal of the horn relay coil
- Pin 30 – Connect to the battery positive terminal
- Pin 87 – Connect to the positive terminal of the horn
Make sure that the wiring is secure and that the connections are tight.
Step 3: Mount the Horn and Relay
The third step is to mount the horn and relay. Find a suitable location for the horn on your vehicle and mount it securely. Also, find a suitable location for the relay and mount it securely.
Step 4: Test the Horn
The final step is to test the horn to ensure that it is working correctly. Turn on your vehicle’s ignition and press the horn button. If the horn sounds, then it is working correctly.
FAQs
Q: What is a relay?
A: A relay is an electrically operated switch that can be used to turn on or off a circuit. It works by using a low-power signal to control a high-power output.
Q: What is a 4 pin relay?
A: A 4 pin relay is a type of relay that has four pins or connectors. The pins are labeled as follows: Pin 30 (common), Pin 87 (normally open), Pin 85 (coil positive), and Pin 86 (coil negative).
Q: What is the purpose of a 4 pin relay?
A: The purpose of a 4 pin relay is to control a high-power output using a low-power signal. It is commonly used in automotive applications to control lights, horns, and other accessories.
Q: How do I know if my horn needs a 12V power supply?
A: Check the specifications of your horn to see if it requires a 12V power supply. Most automotive horns require a 12V power supply, but it is always best to check the specifications to be sure.
Q: Can I use a 5 pin relay instead of a 4 pin relay?
A: Yes, you can use a 5 pin relay instead of a 4 pin relay, but you will need to modify the wiring accordingly. A 5 pin relay has an additional pin for the normally closed (NC) connection.
In conclusion, wiring a horn using a 12V 4 pin relay is a straightforward process that can be accomplished with basic knowledge of electrical circuits. By following the steps outlined in this article, you can install a horn that is reliable and effective.
