Heavy-Duty 12V Automotive Relay Kit - Universal Engine Stop/Immobilizer for Cars & Motorcycles

Take control of your vehicle's security and functionality with our professional 12V DC Relay Kit. Engineered specifically for demanding automotive and motorcycle applications, this robust relay is the ideal core component for creating a custom Engine Stop System or Immobilizer. This isn't just a standard relay; it's a critical safety and security device designed to reliably interrupt your engine's ignition or fuel pump circuit with a hidden switch, a remote trigger, or a secret button. Protect your investment from theft and add a vital safety kill switch for peace of mind on the road.

Key Features & Benefits

• Secure Engine Cut-Off: The primary function of this relay is to act as a high-current switch for your ignition system or fuel pump. By breaking the circuit, it prevents the engine from starting or running, making it an effective deterrent against theft.

• Heavy-Duty 30/40A Capacity: Built to handle the high current (up to 30A continuous, 40A surge) required by ignition coils, fuel pumps, and injectors. This ensures reliable performance without voltage drop or contact welding, which is crucial for safety.

• Universal 12V Compatibility: Works seamlessly with all 12-volt electrical systems, making it perfect for cars, trucks, motorcycles, ATVs, UTVs, and marine applications.

• Robust SPDT (Single Pole Double Throw) Design: This versatile 5-pin configuration allows for two modes of operation:

  • Normally Closed (NC): The circuit is complete, and the engine runs normally until the relay is activated to break the circuit and stop the engine.

  • Normally Open (NO): The circuit is broken, and the engine will not start until the relay is activated to complete the circuit.

  • This flexibility lets you design your "Engine Stop" to be either active or passive.

• Dust & Splash Proof Housing (IP67 Rated): The durable relay casing is sealed against dust and temporary water immersion, ensuring reliable operation in harsh under-hood or under-seat environments, regardless of weather conditions.

• Clear Wiring Diagram & Easy Installation: We include a comprehensive, vehicle-specific wiring guide that shows you exactly how to integrate the relay into your ignition or fuel pump circuit. Standard 6.3mm spade terminals allow for a clean and secure connection.

• Complete Kit Includes: You get everything you need in one box: 1x 12V 30/40A Relay, 1x Heavy-Duty Relay Socket with robust wires, and 1x In-line ATC Fuse Holder with a 15A fuse for critical circuit protection.

Technical Specifications

How It Works: The "Engine Stop" Application

This relay acts as the intelligent "brain" of your security system. Here’s a typical wiring setup:

1. The Load (Circuit to Control): You wire the relay's high-current contacts in-line with your vehicle's ignition coil positive wire or the fuel pump's power wire. This is the circuit that will be broken to stop the engine.

2. The Trigger (Your Secret Switch): The relay's low-current coil is connected to a hidden switch, a button, or a remote control receiver. This is your secret "kill" command.

3. The Operation:

   • Normal Driving: The hidden switch is in the "off" position, providing no power to the relay coil. The relay remains in its default state (e.g., NC), allowing power to flow to the ignition/fuel pump. The vehicle starts and runs normally.

   • Activating Engine Stop: When you flip your hidden switch "on," it sends a small 12V signal to the relay coil. This energizes the coil, which physically switches the internal contacts, instantly cutting power to the ignition coil or fuel pump. The engine will stall immediately and will be impossible to restart until the hidden switch is turned off.

Who Is This For?

• Car & Motorcycle Enthusiasts looking to add a DIY anti-theft immobilizer.

• Racers & Off-Roaders needing a mandatory safety kill switch.

• Vehicle Owners in high-theft areas seeking an inexpensive but highly effective security layer.

• DIY Mechanics wanting to understand and control their vehicle's electrical systems.

Frequently Asked Questions (FAQ)

Q: Can this be used as a full replacement for my car's alarm system?
A: It is an excellent supplement to an alarm system. While an alarm makes noise, this physically prevents the engine from running, which is often a more significant obstacle for a thief.

Q: Is this legal to install on a road-going vehicle?
A: In most regions, yes, as it is a safety and security feature. However, it is your responsibility to ensure the installation does not interfere with mandatory safety systems like airbags or ABS. It is intended as an auxiliary system.

Q: Will this drain my vehicle's battery?
A: No. The relay coil only draws power when your hidden switch is actively engaged. In its default state, it consumes zero power, preventing any parasitic battery drain.

Q: Do you provide a wiring diagram?
A: Yes! A detailed, easy-to-follow wiring diagram specific to the "Engine Stop" application is included with every purchase.

Safety Warning

Disclaimer: Installation requires a good understanding of basic automotive 12V DC electrical systems. Incorrect wiring can lead to vehicle damage, electrical fire, or unintended operation. If you are unsure, please consult a qualified automotive electrician. This product is intended for use by individuals who accept full responsibility for its installation and operation.