iJDMTOY H11/H8 Relay Harness Wire Kit — Dual Output, LED On/Off Pushbutton, Inline Fuse

The iJDMTOY H11/H8 relay harness is a ready-to-install wiring kit that lets you safely power and switch two H11/H8/H9 light outputs from the battery using a 4-pin relay and an LED on/off pushbutton.

This compact kit combines a prewired SPST 4-pin relay module, inline fuse holder, and a teardrop pushbutton with green/red LED so you can drive auxiliary fog lights, driving lamps, or off-road light pods without stressing the vehicle's factory wiring. The harness routes switched power from the battery, includes trigger wiring for interior mounting, and supports common 12V lighting loads up to the relay's rated amperage for reliable on/off control.

How does this relay harness keep my vehicle wiring safe?

By taking heavy current directly from the battery through a dedicated relay and fuse, the kit prevents excessive current from flowing through factory headlight circuits and thin dash wiring. The included 4-pin SPST relay handles the high load while the inline fuse protects the circuit from overload or short conditions.

• Direct battery feed reduces stress on stock wiring and switches
• Inline fuse matched to the relay protects against shorts
• 4-pin socketed relay simplifies replacement and maintenance
• Rated for typical 12V lighting loads within 30–40A relay limits

What lights and loads are compatible with this H11/H8 harness?

Designed with dual H11/H8/H9 outputs, the harness easily powers common fog lamps, driving lights, and small LED light bars or pods. It suits light combinations drawing up to the relay’s recommended wattage, provided total current stays within the relay and vehicle wiring limits.

• Dual outputs accommodate two separate H11/H8/H9-style lamps
• Best for lights operating at 9–16V DC and combined wattage under relay limits
• Works well with LED and halogen fog/driving lamps or small off-road pods
• Use multiple relays for larger lightbars to distribute loads safely

How do I install the kit and wire the switch inside the cabin?

Installation is straightforward: mount the relay and fuse near the battery, route the positive/negative battery leads, and run the trigger wire through a firewall grommet to the dash area for the pushbutton. The teardrop pushbutton has double-sided tape for mounting and a visible green/red LED to show on/off status.

• Attach red/black battery leads to + and - or ACC as preferred
• Secure relay with its socket and mount inline fuse close to the battery
• Run trigger wire into cabin and connect to the pushbutton switch
• Connect dual H11/H8 outputs to your lamps, verify polarity and grounding

What are the kit’s durability and compatibility notes?

The harness uses standard automotive connectors and a teardrop pushbutton designed for general-purpose dashboard use, with mounting tape for a clean fit. While the relay supports typical automotive lighting loads, confirm your combined lamp wattage does not exceed the relay’s rated current for consistent long-term performance.

• Standard 12V automotive relay rated for common lighting applications
• Weather-exposed components should be mounted in protected areas
• Fits most vehicles that accept aftermarket battery-fed relay harnesses
• Replaceable fuse and socketed relay simplify future service

Who is this for: The iJDMTOY H11/H8 relay harness is aimed at DIY installers, automotive enthusiasts, and technicians who want a safer, cleaner way to add or control auxiliary fog, driving, or off-road lights. Choose this kit if you need a compact, battery-fed relay solution with an illuminated cabin switch to prevent factory wiring overload and provide simple on/off control for up to two H11/H8/H9-style lamps.