iJDMTOY H11/H8 Relay Harness with LED On/Off Switch — Universal Fog/Driving Light Control Kit

Effortless power management for automotive lighting

Take control of your front fog lights, driving lights, or off-road light bars with a compact relay harness that centralizes switching, protection, and power delivery. Built around a 12V DC system, this kit is designed to help you manage higher current lighting without directly burdening your vehicle’s main wiring loom. The result is a clean, reliable on/off experience with a clear visual cue from the LED indicator on the switch.

The system blends a robust 4-pin SPST relay module, an inline fuse box, and a teardrop-shaped push button with a green/red LED, offering a straightforward installation path for enthusiasts and professionals alike. Dual H11/H8 outputs support common light configurations, enabling you to power two lighting devices from a single, battery-connected pathway while maintaining separate control through one compact switch.

What’s included and how it works

• 4-pin SPST relay module with socket, rated for 12V DC and 30-40A
• Inline safety fuse box to protect circuits and simplify wiring
• Universal teardrop push button switch with a green/red LED indicator
• Input and output terminals for secure, reliable connections
• Dual H11/H8 outputs suitable for most common automotive lighting kits

The harness draws power directly from the battery to minimize load on the vehicle’s existing circuits, while the trigger wiring lets you activate the lights from inside the cabin. The LED on the switch provides an at-a-glance status check, which can help with quick diagnostics during night drives or when off-road navigating challenging terrain.

Real-world use cases and benefits

Imagine mounting a pair of fog or driving lights to improve visibility on dark rural roads or trail routes. This kit enables you to power two lighting devices through a single, user-friendly switch, with a dedicated fuse and a battery-direct path for dependable performance. The compact module is designed to fit into tight spaces near the dash, leaving your main wiring harness uncluttered and easier to manage.

With the versatile H11/H8 outputs, you can adapt the setup to a wide range of vehicles and lighting configurations. The on/off switch with LED offers a clear signal while the dual outputs give you flexibility for backup or supplemental lighting without requiring extensive rewiring.

Installation tips and best practices

• Connect output contacts to up to two lighting devices
• Attach red/black O-ring or C-ring to battery +/- or ACC/12V+ and ground
• Route signal triggering wires into the car interior near the dashboard
• Wire the switch and test operation before road use to confirm correct behavior

Whether you’re upgrading factory lighting or adding off-road illumination, this harness is designed to simplify power management while maintaining solid performance and clear control. Use it as a practical upgrade to enhance night visibility and overall lighting versatility, with the option to expand support to additional devices in the future.