Hunters Autos ltd

13/10/2026

25/09/2026

Pin Function Guide
• Pin 30 (Input): Connects directly to the 12V DC Battery through an inline fuse (10A - 30A).
• Pin 87 (Output): Delivers power to the Load (Headlight) when the relay is activated.
• Pin 86 (Trigger): Receives a +12V signal from a manual switch to activate the circuit.
• Pin 85 (Ground): Connects to the vehicle chassis or negative battery terminal to complete the coil circuit.
⚙️ How it Works (Step-by-Step)
1. Constant Power: High-current battery power always sits ready at Terminal 30.
2. Control Signal: Turning on the dashboard switch sends a +12V signal to Terminal 86.
3. Electromagnet Activation: Current flows from 86 to 85, powering the internal electromagnetic coil.
4. Closing the Contact: The magnetic field pulls down the Moving Contact (Armature) against the return spring.
5. Powering the Load: This connects Terminal 30 to 87, allowing high current to flow directly to the headlight.
🔄 State Comparison
Feature Relay OFF (Switch OFF) Relay ON (Switch ON)
Pin 86 Voltage 0V (No Signal) +12V (Signal Active)
Internal Coil De-energized Energized (Creates Magnetic Field)
Switching Contact Open (Normally Open) Closed (Pulled Down by Magnet)
Pin 87 Output 0V (Load is OFF) 12V (Load is ON)
If you are currently wiring or troubleshooting a circuit, please let me know:
• What specific accessory (e.g., fog lights, horn, fan) you are installing
• The amperage rating of your accessory or fuse
• If you need help choosing between a 4-pin and a 5-pin relay



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