Motorcycle Dual Horn Relay Wiring Diagram

The motorcycle horn is a critical safety feature, often overlooked until needed. Upgrading to a dual horn system significantly increases audibility, making a motorcycle more noticeable in traffic. Implementing this upgrade safely and effectively requires a solid understanding of the motorcycle dual horn relay wiring diagram. This article provides a detailed exploration of these diagrams, their benefits, practical applications, and troubleshooting tips.

Benefits of Using a Dual Horn Relay Wiring Diagram

Utilizing a motorcycle dual horn relay wiring diagram offers several advantages:

• Increased Loudness: Dual horns produce significantly louder sound levels than a single horn, enhancing rider safety.
• Improved Reliability: A relay ensures the horns receive adequate power directly from the battery, bypassing the potentially weak factory wiring.
• Protection of Existing Wiring: The relay isolates the original horn circuit, preventing damage from the increased current draw of dual horns.
• Enhanced Performance: Consistent and reliable horn operation, regardless of battery voltage fluctuations.

Key Components and Understanding the Wiring Diagram

A typical motorcycle dual horn relay wiring diagram includes these key components:

• 12V Power Source (Battery): Provides the necessary power for the horns.
• Relay: An electromagnetic switch that controls the power flow to the horns. A standard automotive relay is usually sufficient.
• Fuse: Protects the circuit from overcurrent, preventing damage to the wiring and components.
• Horn Switch: Activates the relay, triggering the horns. This usually uses the original horn button on the handlebar.
• Horns (Dual): The audible warning devices.
• Wiring: Conducts the electrical current between the components. Using appropriately sized wire is critical for safety and performance.

Understanding the connections is crucial. Typically, the wiring diagram will show:

• Terminal 30: Connected directly to the positive (+) terminal of the battery, through a fuse.
• Terminal 85: Connected to ground (-).
• Terminal 86: Connected to the existing horn wire from the handlebar switch. This provides the signal to activate the relay.
• Terminal 87: Connected to the positive (+) terminal of both horns. The negative (-) terminals of the horns are connected to ground.

Practical Application

Follow these steps to implement a motorcycle dual horn relay wiring diagram:

1. Gather Materials: Acquire a relay, fuse holder and fuse (usually 10-15 amp), wiring (14-16 gauge is typically adequate), wire connectors, electrical tape, and your new dual horns.
2. Disconnect Battery: Always disconnect the negative (-) terminal of the battery before working on electrical systems.
3. Mount Horns: Securely mount the dual horns in a suitable location on the motorcycle, ensuring they are clear of moving parts.
4. Wire the Relay: Following the wiring diagram:
   • Connect terminal 30 to the positive battery terminal via a fused connection.
   • Connect terminal 85 to a suitable ground point on the motorcycle frame.
   • Connect terminal 86 to the wire that was previously connected to your original horn.
   • Connect terminal 87 to the positive terminal of each horn, wiring them in parallel.
5. Connect Horns to Ground: Connect the negative terminal of each horn to a suitable ground point.
6. Secure Wiring: Ensure all wiring is properly secured and routed away from heat sources and moving parts. Use zip ties or electrical tape to protect the wires.
7. Reconnect Battery: Reconnect the negative (-) terminal of the battery.
8. Test: Test the horns to ensure they are functioning correctly.

1. Troubleshooting Common Issues

• Horns Do Not Work: Check the fuse, relay connections, horn switch, and battery voltage. Use a multimeter to verify power and ground connections.
• Horns Sound Weak: Check for loose wiring connections or insufficient battery voltage. Consider upgrading to heavier gauge wiring.
• Fuse Blows: Check for short circuits in the wiring. Ensure the fuse is rated appropriately for the current draw of the horns.

2. Tips for Best Practice

• Use Quality Components: Invest in a good quality relay and wiring for reliable performance.
• Protect Wiring: Use heat shrink tubing or electrical tape to protect connections from moisture and corrosion.
• Proper Grounding: Ensure all ground connections are secure and clean.
• Follow the Diagram: Double-check all wiring connections against the motorcycle dual horn relay wiring diagram before reconnecting the battery.

FAQs

Q: What size fuse should I use?
A: A 10-15 amp fuse is typically sufficient for most dual horn setups. Consult the horn specifications for their current draw. For more related activities, check out our Polaris Oem Winch Rocker Switch Wiring Diagram.

Q: Can I use my existing horn wiring?
A: Yes, but only to trigger the relay. The relay provides the power for the horns; do not directly power the dual horns from the original wiring.

Q: Where should I mount the relay?
A: Mount the relay in a dry, protected location. Consider using a relay box to further protect it from the elements.

Conclusion

Implementing a motorcycle dual horn relay wiring diagram is a practical upgrade to enhance safety and audibility. By understanding the wiring, components, and following the proper steps, motorcyclists can confidently improve their bike’s warning system. Remember to prioritize safety and always double-check wiring connections for reliable operation. A louder horn can significantly increase your visibility and safety on the road.