--- product_id: 375776044 title: "JD1912 Car Relay Harness 12V 40A 4 Pin SPST Harness Sockets with Color-Labeled Wires for Automotive Truck Van Motorcycle Boat (Pack of 2)" brand: "gebildet" price: "¥3336" currency: JPY in_stock: true category: "Gebildet" url: https://www.desertcart.jp/products/375776044-jd1912-car-relay-harness-12v-40a-4-pin-spst-harness store_origin: JP region: Japan --- # 40A high current capacity 12V low power consumption 15ms ultra-fast operate time JD1912 Car Relay Harness 12V 40A 4 Pin SPST Harness Sockets with Color-Labeled Wires for Automotive Truck Van Motorcycle Boat (Pack of 2) **Brand:** gebildet **Price:** ¥3336 **Availability:** ✅ In Stock ## Summary > ⚡ Upgrade your ride with relay power that never quits! ## Quick Answers - **What is this?** JD1912 Car Relay Harness 12V 40A 4 Pin SPST Harness Sockets with Color-Labeled Wires for Automotive Truck Van Motorcycle Boat (Pack of 2) by gebildet - **How much does it cost?** ¥3336 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/375776044-jd1912-car-relay-harness-12v-40a-4-pin-spst-harness) ## Best For - gebildet enthusiasts ## Why This Product - Trusted gebildet brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durability That Lasts:** Rated for 100,000 electrical and 10 million mechanical operations—reliability you can trust. - • **Plug & Play Simplicity:** Color-labeled wires and socket mount design for effortless installation across vehicles. - • **Powerhouse Performance:** Handles up to 40 Amps for heavy-duty automotive demands. - • **Lightning-Fast Switching:** Operates in just 15 milliseconds to keep your systems responsive. - • **Built-In Voltage Protection:** Integrated diode safeguards your electronics from voltage spikes. ## Overview The Gebildet JD1912 Car Relay Harness is a 12V, 40A 4-pin SPST relay set designed for automotive, truck, van, motorcycle, and boat applications. Featuring a built-in diode for voltage spike protection, silver alloy contacts with ≤100mΩ resistance, and ultra-fast 15ms switching, it ensures reliable, long-lasting performance with up to 100,000 electrical cycles. Its compact design and color-coded wiring make installation seamless, perfect for professionals demanding durability and efficiency. ## Description Interchangeable/Compatible with: All automobiles and devices equipped with a 12 Volt DC power source. Relay technical specification: Relay load: 40A/12VDC Contact Resistance: ≤ 100MΩ Contact Material: Ag Alloy Life Expectancy Electrical: 100,000 Operations (at 30 Operations/min) Life Expectancy Mechanical: 10,000,000 Operations Coil power:1.8W Operate Time: 15ms Release Time: 10ms Initial withstand voltage of Contact and Contact: 1000VAC/1min Initial withstand voltage of Contact and Coil: 1500VAC/1min Insulation Resistance: 100MΩ/( 500VDC) Temperature Range: -55°C ~+70°C Humidity Range:35%-80% Atmospheric Pressure:86-106KPa Gebildet Operation Goal: Create value for our customers is our responsibility, quality products and sincere service is our eternal pursuit. After Sale Service: Customer satisfaction is our greatest pursuit, If you found our products don’t work or not so good quality as you think, Please contact us without hesitation. We can resend you a new item or 100% refund money as you like. Feedback and Review warmly welcome: Your Feedback and Review are the motivation for us to provide best product and service, we really appreciate to hear the suggestion from you. ## Features - Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage. - Small size/Low power consumption/High contact voltage/ High sensitivity. - Contact Material: Ag Alloy / Contact Resistance: ≤ 100MΩ. - Minimum operating voltage 8V, corresponding minimum operating current is 100mA; Standard operating voltage 12V, corresponding standard operating current is 150mA. - Life Expectancy Electrical: 100,000 Operation, Life Expectancy Mechanical: 10,000,000 Operation. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B078T8CMF6 | | Best Sellers Rank | #12,014 in Automotive ( See Top 100 in Automotive ) #5 in Automotive Starter Relays | | Brand Name | Gebildet | | Coil Resistance | 100 Megaohms | | Coil Voltage | 12 Volts (DC) | | Connector Type | Spade | | Contact Current Rating | 40 Amps | | Contact Material | Silver Alloy | | Contact Type | Normally Open | | Current Rating | 40 Amps | | Customer Reviews | 4.6 4.6 out of 5 stars (2,360) | | Manufacturer | Gebildet | | Maximum Switching Current | 40 Amps | | Minimum Switching Voltage | 8 Volts | | Model | E079 | | Mounting Type | Socket Mount | | Operating Time | 0.02 Seconds | | Operation Mode | Manual | | Part Number | E079 | | UPC | 694090222994 | | Unit Count | 2 Count | | Upper Temperature Rating | 70 Degrees Celsius | | Wattage | 480 watts | ## Product Details - **Connector type:** Spade - **Contact material:** Silver Alloy - **Contact type:** Normally Open - **Current rating:** 40 Amps - **Mounting type:** Socket Mount ## Images ![JD1912 Car Relay Harness 12V 40A 4 Pin SPST Harness Sockets with Color-Labeled Wires for Automotive Truck Van Motorcycle Boat (Pack of 2) - Image 1](https://m.media-amazon.com/images/I/515fFB9a2XL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: I received the jd2912 relays. what email address do i email?** A: You can contact son of wil through Amazon. **Q: so in the picture the top red wire that is 87 goes to the motor to turn it on but it shows in the picture red turns to black and it is ground?** A: The red wire goes to the device that you want to turn on and the black to that Device **Q: what gauge wire on battery terminals** A: I used a 14 gauge wire to the battery **Q: I have a positively grounded (+ ground) system. The relay coil should still operate correct?** A: If you are stating the chassis is battery plus, then it should work, but would need to cycle your negative signals to control coils. John Deere 60 tractors have a positive chassis methodology, so might need to investigate how they operate to verify implementation. ## Frequently Bought Together - Gebildet JD1912 Car Relay Harness 12V 40A 4 Pin SPST 12AWG Harness Sockets with Color-Labeled Wires for Automotive Truck Van Motorcycle Boat (Pack of 2) - 6 Pack Inline Fuse Holder 12V, Upgraded 12 AWG Waterproof Fuse Holder with 66 Pcs Standard Car Fuses (2A/3A/5A/7.5A/10A/15A/20A/25A/30A/35A/40A), YNZDRWA in Line Fuses Holders 12v for Marine Auto - VIABRICO 12Gauge 100FT Electrical Wire Cable 2 Conductors Red Black Cable Hookup LED Lighting Strips Flexible Wire Extension Cord 12AWG Copper Clad Aluminum Copper Wire 12V/24V DC -30.5M --- ## 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.jp/products/375776044-jd1912-car-relay-harness-12v-40a-4-pin-spst-harness](https://www.desertcart.jp/products/375776044-jd1912-car-relay-harness-12v-40a-4-pin-spst-harness) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-08-27*