---
product_id: 33529505
title: "High/Low Relay Wire Harness Compatible with Original H4 Dual-Beam to Separated 9005/9006 Hi/Lo Beams"
brand: "ijdmtoy"
price: "£22.16"
currency: GBP
in_stock: true
reviews_count: 10
category: "I Jdmtoy"
url: https://www.desertcart.co.uk/products/33529505-high-low-relay-wire-harness-compatible-with-original-h4-dual
store_origin: GB
region: United Kingdom
---

# 12V DC, 30-40AMP max power Dual 4-pin SPST relay modules Compatible with H4 to 9005/9006 separated beams High/Low Relay Wire Harness Compatible with Original H4 Dual-Beam to Separated 9005/9006 Hi/Lo Beams

**Brand:** ijdmtoy
**Price:** £22.16
**Availability:** ✅ In Stock

## Summary

> ⚡ Upgrade your ride’s lighting game with seamless power and control!

## Quick Answers

- **What is this?** High/Low Relay Wire Harness Compatible with Original H4 Dual-Beam to Separated 9005/9006 Hi/Lo Beams by ijdmtoy
- **How much does it cost?** £22.16 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/33529505-high-low-relay-wire-harness-compatible-with-original-h4-dual)

## Best For

- ijdmtoy enthusiasts

## Why This Product

- Trusted ijdmtoy brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Protect Your Ride:** Built-in in-line fuse box safeguards your vehicle’s wiring from overloads and shorts.
- • **Plug & Play Precision:** Pre-wired dual relay modules simplify installation and ensure seamless integration.
- • **Optimize Your Lighting:** Direct battery power feed prevents strain on factory wiring, enhancing light output and longevity.
- • **Versatile Compatibility:** Supports multiple headlight connectors including H4, 9005, 9006, HB3, and HB4 for ultimate retrofit flexibility.
- • **Power Up with Confidence:** Handles heavy-duty 12V electrical loads up to 40AMP for reliable performance.

## Overview

The iJDMTOY High/Low Relay Wire Harness is a robust 12V DC relay system designed to convert original H4 dual-beam headlights into separated 9005/9006 hi/lo beams. Featuring dual 4-pin SPST relays, an in-line fuse, and broad connector compatibility, it ensures safe, efficient power delivery directly from the battery, reducing load on factory wiring and enabling easy on/off control for multiple lighting applications.

## Description

Product description iJDMTOY Headlight High/Low Conversion Relay Wire Harness Compatible With Original H4 Headlamps To Separated 9005/9006 High Beam & Low Beam Headlights. For detail fitment information and product specification, please refer to product feature bullet point(s). Thanks for choosing iJDMTOY for your automotive lightings and accessories!

Review: Great product - Awesome to yes if you know what you're doing
Review: Miata NB1 to NB2 Headlight Conversion - I did a headlight conversion from a Mazda Miata NB1 to NB2 and used this wiring harness. The NB1 Miata has a ground switching circuit, so the diode in the harness needs to be removed. Once that's done, the low beams stay on when I turn on the high beams. The indicator on the dash also works. I wouldn't say this is super amazing quality, but it gets the job done and has been working so far, so I recommend the product!

## Features

- One relay wiring harness set includes two 4-pin SPST relay module boxes, in-line safety fuse box, input +/- terminals, and H4/HB2/9003 input trigger and four 9006/HB4/9005/HB3 outputs for reliable and efficient electrical connections
- The pre-wired dual SPST 4-pin electrical relay unit, complete with socket and rated at 12V DC with a maximum of 30-40AMP, is ideal for most heavy duty electronic devices, light applications between 9-16V DC, with a wattage not exceeding 320W
- H4/9003/HB2 inptut trigger, with four sets of HB4/HB3 outputs, good for light applications with socket sizes of 9006/9012/HB4, 9005/HB3 H10 9145 9140 9055, etc
- Perfect for power management, this relay harness is ideal for applications like front fog/driving lights and off-road lightbars, pod lamps drawing power directly from the battery to prevent excessive load on the vehicle's existing wiring system and ensuring safe, easy on/off operation
- Installation tips: connect output contacts to up to 4 light applications/devices, attach red/black O-ring/C-ring to battery +/- or ACC/accessory 12V+/ground, connect the signal triggering wires to existing/factory adapter to trigger the on/off operation

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01M15V3HK |
| Best Sellers Rank | #130,362 in Automotive ( See Top 100 in Automotive ) #476 in Automotive Replacement Electrical Wiring Harnesses |
| Brand | iJDMTOY |
| Brand Name | iJDMTOY |
| Coil Voltage | 12 Volts (DC) |
| Connector Type | H4, 9006, Hb3 |
| Contact Current Rating | 40 Amps |
| Contact Material | Silver |
| Contact Type | Normally Open |
| Current Rating | 40 Amps |
| Customer Reviews | 4.2 out of 5 stars 141 Reviews |
| Item Weight | 8 ounces |
| Manufacturer | iJDMTOY Auto Accessories |
| Minimum Switching Voltage | 12 Volts (DC) |
| Model | For Repair, Conversion, Custom Retrofit |
| Mounting Type | DIN Rail Mount |
| Operation Mode | Manual |
| Part Number | AA1089a |
| Wattage | 320 watts |

## Product Details

- **Brand:** iJDMTOY
- **Connector Type:** H4, 9006, Hb3
- **Item Weight:** 8 ounces
- **Material:** Ceramic and Copper Wires
- **Number of Items:** 1

## Images

![High/Low Relay Wire Harness Compatible with Original H4 Dual-Beam to Separated 9005/9006 Hi/Lo Beams - Image 1](https://m.media-amazon.com/images/I/71jHAPJlqYL.jpg)
![High/Low Relay Wire Harness Compatible with Original H4 Dual-Beam to Separated 9005/9006 Hi/Lo Beams - Image 2](https://m.media-amazon.com/images/I/61ckZ+FZ5DL.jpg)
![High/Low Relay Wire Harness Compatible with Original H4 Dual-Beam to Separated 9005/9006 Hi/Lo Beams - Image 3](https://m.media-amazon.com/images/I/314matnZ4zL.jpg)
![High/Low Relay Wire Harness Compatible with Original H4 Dual-Beam to Separated 9005/9006 Hi/Lo Beams - Image 4](https://m.media-amazon.com/images/I/61xDcyCh9EL.jpg)
![High/Low Relay Wire Harness Compatible with Original H4 Dual-Beam to Separated 9005/9006 Hi/Lo Beams - Image 5](https://m.media-amazon.com/images/I/71k-P1fFFVL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product
*by R***S on August 27, 2025*

Awesome to yes if you know what you're doing

### ⭐⭐⭐⭐⭐ Miata NB1 to NB2 Headlight Conversion
*by P***Z on April 17, 2025*

I did a headlight conversion from a Mazda Miata NB1 to NB2 and used this wiring harness. The NB1 Miata has a ground switching circuit, so the diode in the harness needs to be removed. Once that's done, the low beams stay on when I turn on the high beams. The indicator on the dash also works. I wouldn't say this is super amazing quality, but it gets the job done and has been working so far, so I recommend the product!

### ⭐⭐⭐⭐ decent product but you get what you pay for
*by A***R on January 12, 2024*

product worked as advertised but was too short so i needed to extend multiple leads which was fine and is what it is but overall its just a cheap product so dont expect too much

## Frequently Bought Together

- iJDMTOY High/Low Relay Wire Harness Compatible with Original H4 Dual-Beam to Separated 9005/9006 Hi/Lo Beams
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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-06-10*