Upgrade Your Vehicle's Electrical System with Reliable Switching Power Whether you are replacing a failed OEM relay or building a custom lighting setup, this 4 Pin 12V 40A Automotive Relay delivers consistent, heavy-duty performance. Designed specifically for 12-volt DC systems commonly found in cars, trucks, SUVs, vans, boats, and agricultural machinery. 🔧 Technical Specifications: Type: SPST-NO (Single Pole Single Throw - Normally Open) Pins: 4-Pin (Standard ISO configuration: 30, 85, 86, 87) Coil Voltage: 12V DC Contact Rating: 40 Amps at 12V DC (resistive load) Material: High-temperature PBT plastic housing + Silver alloy contacts for durability Life Expectancy: >100,000 electrical cycles 💡 Common Applications: Fog Lights & LED Light Bars: Eliminate flickering and voltage drop by providing direct power. Horns & Air Compressors: Handle high inrush current without overheating. Cooling Fans & Fuel Pumps: Maintain stable operation for critical engine components. Headlights & Auxiliary Power: Add switching control for aftermarket accessories. Winches & Solenoids: Reliable switching for off-road and towing setups. 📦 Package Contents: 1 x 12V 40A Automotive Relay (4-pin) Note: Relay socket/harness is not included. For plug-and-play convenience, please search for "4 pin relay socket" in our store. ✅ Why Choose This Relay? Heat & Vibration Resistant: Secured terminals and robust housing withstand harsh engine bay conditions. Easy Identification: Each relay is clearly labeled with pin numbers and amp rating for hassle-free replacement. Standard Fitment: Fits any standard 4-pin 12V relay socket. 🚚 Installation Tips: Disconnect the battery negative terminal before starting. Remove the old relay or connect to the socket following the pin diagram. Match Pins: 30: Connect to Power Source (Battery/Fuse Box) 87: Connect to Accessory (Light/Horn/Fan) 85 & 86: Connect to Switch/Trigger (Ground or Power depending on setup) Reconnect the battery and test your device.