--- 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: "HK$249" currency: HKD in_stock: true reviews_count: 10 category: "I Jdmtoy" url: https://www.desertcart.hk/products/33529505-high-low-relay-wire-harness-compatible-with-original-h4-dual store_origin: HK region: Hong Kong --- # 40A max current rating Supports up to 320W power 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:** HK$249 **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?** HK$249 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/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 - • **Smart Safety Fuse:** In-line fuse box included for ultimate protection against electrical faults and surges. - • **Plug & Play Precision:** Pre-wired dual SPST 4-pin relays simplify installation and guarantee seamless compatibility with H4 to 9005/9006 conversions. - • **Powerhouse Protection:** 40 Amp contact rating ensures heavy-duty reliability for your lighting setup. - • **Load-Balanced Lighting:** Direct battery power feed prevents wiring overload, safeguarding your vehicle’s electrical system. - • **Versatile Connectivity:** Supports multiple socket types (9006, HB4, 9005, HB3) for broad application across fog lights, off-road bars, and pod lamps. ## Overview The iJDMTOY High/Low Relay Wire Harness is a robust 12V DC relay system designed for seamless conversion from H4 dual-beam headlights to separated 9005/9006 hi/lo beams. Featuring dual 4-pin SPST relays rated at 40 amps and supporting up to 320 watts, it ensures efficient power delivery directly from the battery, protecting your vehicle’s wiring. Ideal for fog lights, off-road lightbars, and pod lamps, this harness offers versatile socket compatibility and includes an in-line fuse for enhanced safety and reliability. ## Description Buy iJDMTOY High/Low Relay Wire Harness Compatible with Original H4 Dual-Beam to Separated 9005/9006 Hi/Lo Beams: Wiring Harnesses - desertcart.com ✓ FREE DELIVERY possible on eligible purchases 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! Review: Great product - Awesome to yes if you know what you're doing ## 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 | #148,625 in Automotive ( See Top 100 in Automotive ) #595 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 | 0.5 Pounds | | 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 ### ⭐⭐⭐⭐⭐ 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! ### ⭐⭐⭐⭐⭐ Great product *by R***S on August 27, 2025* Awesome to yes if you know what you're doing ### ⭐⭐⭐⭐ Works great with scion Xa projectors retro fit *by J***N on July 17, 2023* These are so close to plug and play just needed to switch two wire around on the main h4 plug harness for it to work! besides that now everything works now and I'm happy with the results! ## 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.hk/products/33529505-high-low-relay-wire-harness-compatible-with-original-h4-dual](https://www.desertcart.hk/products/33529505-high-low-relay-wire-harness-compatible-with-original-h4-dual) --- *Product available on Desertcart Hong Kong* *Store origin: HK* *Last updated: 2026-07-05*