--- 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: "5575 kr" currency: ISK in_stock: true reviews_count: 10 category: "I Jdmtoy" url: https://www.desertcart.is/products/33529505-high-low-relay-wire-harness-compatible-with-original-h4-dual store_origin: IS region: Iceland --- # 40A max current rating Direct battery power input Dual 4-pin SPST relay modules High/Low Relay Wire Harness Compatible with Original H4 Dual-Beam to Separated 9005/9006 Hi/Lo Beams **Brand:** ijdmtoy **Price:** 5575 kr **Availability:** ✅ In Stock ## Summary > ⚡ Upgrade your ride’s lighting game with power and precision! ## 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?** 5575 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/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 - • **Dual Relay Modules:** Two pre-wired 4-pin SPST relays ensure seamless switching between high and low beams. - • **Heavy-Duty 40A Capacity:** Handles up to 40 amps for robust, reliable power delivery without overheating. - • **Universal Compatibility:** Fits H4/HB2/9003 inputs and outputs to 9005/9006/HB3/HB4 sockets for versatile retrofit projects. - • **Battery-Powered Efficiency:** Draws power directly from the battery to protect your vehicle’s wiring and boost lighting performance. - • **Plug-and-Play Installation:** Simple wiring harness with inline fuse and clear terminals for quick, safe setup—no guesswork needed. ## Overview The iJDMTOY High/Low Relay Wire Harness is a professional-grade automotive wiring solution designed to convert original H4 dual-beam headlights into separated 9005/9006 high and low beams. Featuring dual 4-pin SPST relays rated for 40 amps and 320 watts, it ensures efficient, safe power delivery directly from the battery, reducing load on factory wiring. Compatible with a wide range of headlight sockets, this harness is ideal for upgrading fog lights, off-road light bars, and custom lighting setups with easy installation and reliable performance. ## 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) ## 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 - Garage-Pro Grille Assembly Compatible with 2003-2014 Chevrolet Express 1500, Fits 2003-2021 Express 2500, 2003-2023 Express 3500, Gray Shell and Insert, For Models with Composite Headlights - Auto Dynasty Headlights Assembly Compatible with 2003-2024 Chevy Express GMC Savana 1500 2500 3500 4500, 4Pcs Halogen Headlamps Replacement w/Bumper Lamps, Black Housing Clear Corner --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.is/products/33529505-high-low-relay-wire-harness-compatible-with-original-h4-dual](https://www.desertcart.is/products/33529505-high-low-relay-wire-harness-compatible-with-original-h4-dual) --- *Product available on Desertcart Iceland* *Store origin: IS* *Last updated: 2026-06-19*