Description
⚙️ Why Horn Relay is Needed
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Protects the horn switch from high current
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Ensures strong & loud horn sound
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Reduces voltage drop
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Increases horn life
🔌 Horn Relay Pin Details (4-Pin Relay)
Most common horn relay uses 4 pins:
| Pin No | Function | Description |
|---|---|---|
| 30 | Power Input | Battery +ve |
| 85 | Coil (-) | Ground or horn switch |
| 86 | Coil (+) | Horn switch or ignition |
| 87 | Output | To horn +ve |
📌 When the horn button is pressed, pins 30 & 87 connect.
🔌 5-Pin Horn Relay (With NC)
| Pin | Function |
|---|---|
| 30 | Battery Input |
| 85 | Coil (-) |
| 86 | Coil (+) |
| 87 | Normally Open (NO) |
| 87a | Normally Closed (NC) |
⚡ Electrical Specifications (Typical)
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Voltage: 12V DC
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Current: 30A / 40A
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Contact Type: SPST / SPDT
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Material: Copper / Silver alloy contacts
🔩 Wiring Diagram (Simple Explanation)
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Battery + ➜ Pin 30
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Horn ➜ Pin 87
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Horn switch ➜ Pin 86
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Ground ➜ Pin 85
🚗 Common Uses
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Car horn
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Bike horn
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Dual horn setup
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Air horn system



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