5 Pin Relay Wiring For Beginners | Diagram | @WiringRescue

Introduction

This tutorial will guide you through wiring a 5 pin relay, a critical component in controlling higher power devices with low amperage switches. Understanding how to use relays can help prevent damage to your switches and improve the efficiency of your electrical circuits.

Chapter 1: Wire your relay right - positive vs negative trigger

• Understanding Relay Types: Relays can be triggered by a positive signal or a negative signal.
• Positive Trigger: When the switch sends a positive signal to the relay.
• Negative Trigger: When the switch completes a ground circuit to activate the relay.

Chapter 2: How to wire a simple light circuit

• Basic Circuit Setup:
  1. Start with a power source connected through a fuse.
  2. Connect the switch, which will control the circuit to a light bulb.
  3. The bulb must also be grounded to complete the circuit.
• Switch Rating: Ensure the switch can handle the load of the connected device (e.g., switch rated for 5 amps for a device drawing 10 amps).

Chapter 3: Understanding how a 5 Pin Relay works

• Relay Pin Configuration:
  • Pin 86: Trigger input
  • Pin 85: Ground
  • Pin 30: Power input for the load
  • Pin 87: Power output to the load when activated
  • Pin 87a: Power output when the relay is not activated

Chapter 4: How to wire a relay with a positive trigger wire

1. Components Needed:
   • 5 pin relay
   • Fuse
   • Switch
   • Light bulb or motor
2. Wiring Steps:
   • Connect the power from the fuse to the switch.
   • From the switch, connect a wire to Pin 86 of the relay.
   • Connect Pin 85 to ground.
   • Connect Pin 30 to the power input for your device (light bulb or motor).
   • Connect Pin 87 to the output leading to the device.
   • Ground the device to complete the circuit.

Chapter 5: Pin Connections for Positive Trigger

• Pin 86: Receives power from the switch.
• Pin 85: Ground connection.
• Pin 30: Connect to the blue wire for powering the device.
• Pin 87: Output to the device (e.g., light bulb).
• Pin 87a: Optional, can be used for an additional circuit (e.g., fog lights).

Chapter 6: How to wire a relay with a negative trigger wire

1. Negative Trigger Setup:
   • Use a single wire to connect to the switch which will ground the relay.
2. Wiring Steps:
   • Connect the power from the fuse to Pin 30 and to Pin 86.
   • The switch connects to Pin 85 and the other side to ground.
   • Connect Pin 87 to the output device.
   • Ground the device to complete the circuit.

Chapter 7: Pin Connections for Negative Trigger

• Pin 30: Power input.
• Pin 86: Constant power connection.
• Pin 85: Connects to the switch which grounds the relay.
• Pin 87: Output leading to the device (e.g., bulb).
• Pin 87a: Remains powered when the relay is off, can be utilized for alternate circuits.

Conclusion

Understanding how to wire a 5 pin relay is essential for safely operating devices that draw more current than a standard switch can handle. Whether using a positive or negative trigger, ensure your connections are secure and correctly wired to avoid electrical issues. For further learning, explore additional resources on electrical circuits and relay applications.