--- product_id: 61018792 title: "Gebildet 2pcs 12V 40A 4 Pin SPST Car Relay Harness JD1912, 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Boat Motorcycle" brand: "gebildet" price: "$23.67" currency: USD in_stock: true reviews_count: 13 category: "Gebildet" url: https://www.desertcart.us/products/61018792-gebildet-2pcs-12v-40a-4-pin-spst-car-relay-harness store_origin: US region: United States of America --- # 40A high current capacity 12V coil voltage standard Built-in diode for surge protection Gebildet 2pcs 12V 40A 4 Pin SPST Car Relay Harness JD1912, 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Boat Motorcycle **Brand:** gebildet **Price:** $23.67 **Availability:** ✅ In Stock ## Summary > 🚗 Power your ride with precision and protection — don’t get left in the dark! ## Quick Answers - **What is this?** Gebildet 2pcs 12V 40A 4 Pin SPST Car Relay Harness JD1912, 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Boat Motorcycle by gebildet - **How much does it cost?** $23.67 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/61018792-gebildet-2pcs-12v-40a-4-pin-spst-car-relay-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 - • **Built-In Surge Shield:** Integrated diode protects your vehicle’s electrical system from damaging voltage spikes. - • **Durability That Lasts:** Engineered for 100,000 electrical cycles and sealed for waterproof reliability in harsh conditions. - • **Plug & Play Simplicity:** Color-coded 4-pin socket harness ensures error-free, hassle-free installation every time. - • **Versatile Compatibility:** Perfect for cars, trucks, motorcycles, boats—any 12V DC system demanding robust relay performance. - • **Power Up with Confidence:** Handles up to 40 amps for heavy-duty automotive and motorcycle accessories. ## Overview The Gebildet JD1912 Car Relay Harness is a premium 12V 40A 4-pin SPST relay with a built-in diode for surge protection, designed for automotive, motorcycle, and marine applications. Featuring silver alloy contacts with ultra-low resistance and a rugged waterproof casing, it guarantees up to 100,000 electrical operations and seamless, error-proof installation via color-coded wiring. Ideal for professionals and enthusiasts seeking reliable, high-performance power switching solutions that safeguard their vehicle’s electrical system while simplifying complex wiring setups. ## Description Relay Technical Specification: Relay load: 40A/12VDC Coil power:1.8W Operate Time: 15ms Release Time: 10ms Contact Resistance: ≤ 100MΩ Contact Material: Ag Alloy Life Expectancy Electrical: 100,000 Operations (at 30 Operations/min) Life Expectancy Mechanical: 10,000,000 Operations 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 Interchangeable/Compatible with: All automobiles and devices equipped with a 12 Volt DC power source. 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. Review: Good quality Relay - I recently acquired the Gebildet JD1912 Car Relay Harness 12V 40A 4 Pin SPST Harness Sockets with Color-labeled Wires for Automotive Truck, and I must say, it has exceeded my expectations. This well-crafted harness has truly impressed me with its quality construction and user-friendly features, particularly the color-coded wires that greatly simplify the installation process. I utilized the Gebildet JD1912 Car Relay Harness to integrate a new light bar onto my truck, and the results were outstanding. The 40-amp relay provided ample power for my light bar's requirements, ensuring optimal performance. Furthermore, the wires included in the harness are adequately thick to handle the electrical current without risking overheating or any compromise in functionality. The combination of durability and reliable performance instilled a sense of confidence in the harness's ability to handle the demands of my lighting setup. A notable advantage of the Gebildet JD1912 Car Relay Harness is its versatility. This harness is accompanied by a selection of connectors, allowing for a wide range of applications. I was able to seamlessly connect my light bar to various components in my truck, including the battery, fuse box, and switch, thanks to the inclusion of these well-designed connectors. This adaptability adds immense value to the harness, making it a practical and versatile solution for automotive enthusiasts seeking reliable electrical connections. Overall, the Gebildet JD1912 Car Relay Harness stands as a remarkable product. Its superior construction and thoughtful design ensure a seamless installation process, even for individuals with limited technical expertise. The convenience of color-coded wires greatly simplifies the setup, reducing the likelihood of errors or confusion during installation. The reliability of the harness, combined with its compatibility with a variety of applications, demonstrates its worth as a top-quality product in the market. While the Gebildet JD1912 Car Relay Harness boasts several strengths, it is important to consider some potential drawbacks. One aspect to keep in mind is the relatively higher price point compared to some alternative brands. However, this price difference can be justified by the harness's superior quality and reliable performance. Additionally, it may be slightly less readily available than more widely recognized brands, although it is certainly worth the effort to seek out this exceptional product. Taking into account the advantages and potential limitations, it is evident that the Gebildet JD1912 Car Relay Harness is a commendable choice. Its durable construction, user-friendly features, and adaptability make it a standout product in the realm of car relay harnesses. I wholeheartedly recommend this harness to anyone in search of a reliable and convenient solution for their automotive electrical needs. Review: Helped Bypass my 2025 Civic BCM - I tried hooking up some new LED lights for my 2025 Civic's trunk by "piggy backing" from the factory trunk light cicuit. Little did I know that it trips the car's BCM and turned off all the interior lights. Doing research, I found out about using this relay with a diode would do the trick, and with the very little knowledge I have with electrical wiring, I was able to successfully and, most importantly, safely switch the lights on when my trunk opens up without triggering the BCM. I am very happy with this product. With a little research on how to wire this, it works like a charm for a very reasonable price since it comes in a pack of two. I also like that it's a socket type, so having to connect four wires was a little more flexible to work with and also that there are no exposed wires. ## 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 | #3,052 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Starter Relays | | Brand | Gebildet | | Brand Name | Gebildet | | Coil Voltage | 12 Volts | | Connector Type | Spade | | Contact Current Rating | 40 Amps | | Contact Material | Silver Alloy | | Contact Type | Normally Open | | Current Rating | 40 Amps | | Customer Reviews | 4.7 out of 5 stars 2,318 Reviews | | 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 | 2.0 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 ![Gebildet 2pcs 12V 40A 4 Pin SPST Car Relay Harness JD1912, 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Boat Motorcycle - Image 1](https://m.media-amazon.com/images/I/51cknFngwxL.jpg) ![Gebildet 2pcs 12V 40A 4 Pin SPST Car Relay Harness JD1912, 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Boat Motorcycle - Image 2](https://m.media-amazon.com/images/I/61WCQ6qX2wL.jpg) ![Gebildet 2pcs 12V 40A 4 Pin SPST Car Relay Harness JD1912, 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Boat Motorcycle - Image 3](https://m.media-amazon.com/images/I/61nu1O3BGiL.jpg) ![Gebildet 2pcs 12V 40A 4 Pin SPST Car Relay Harness JD1912, 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Boat Motorcycle - Image 4](https://m.media-amazon.com/images/I/618mvl8FgML.jpg) ![Gebildet 2pcs 12V 40A 4 Pin SPST Car Relay Harness JD1912, 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Boat Motorcycle - Image 5](https://m.media-amazon.com/images/I/61wKAW-jZrL.jpg) ## 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good quality Relay *by G***. on June 28, 2023* I recently acquired the Gebildet JD1912 Car Relay Harness 12V 40A 4 Pin SPST Harness Sockets with Color-labeled Wires for Automotive Truck, and I must say, it has exceeded my expectations. This well-crafted harness has truly impressed me with its quality construction and user-friendly features, particularly the color-coded wires that greatly simplify the installation process. I utilized the Gebildet JD1912 Car Relay Harness to integrate a new light bar onto my truck, and the results were outstanding. The 40-amp relay provided ample power for my light bar's requirements, ensuring optimal performance. Furthermore, the wires included in the harness are adequately thick to handle the electrical current without risking overheating or any compromise in functionality. The combination of durability and reliable performance instilled a sense of confidence in the harness's ability to handle the demands of my lighting setup. A notable advantage of the Gebildet JD1912 Car Relay Harness is its versatility. This harness is accompanied by a selection of connectors, allowing for a wide range of applications. I was able to seamlessly connect my light bar to various components in my truck, including the battery, fuse box, and switch, thanks to the inclusion of these well-designed connectors. This adaptability adds immense value to the harness, making it a practical and versatile solution for automotive enthusiasts seeking reliable electrical connections. Overall, the Gebildet JD1912 Car Relay Harness stands as a remarkable product. Its superior construction and thoughtful design ensure a seamless installation process, even for individuals with limited technical expertise. The convenience of color-coded wires greatly simplifies the setup, reducing the likelihood of errors or confusion during installation. The reliability of the harness, combined with its compatibility with a variety of applications, demonstrates its worth as a top-quality product in the market. While the Gebildet JD1912 Car Relay Harness boasts several strengths, it is important to consider some potential drawbacks. One aspect to keep in mind is the relatively higher price point compared to some alternative brands. However, this price difference can be justified by the harness's superior quality and reliable performance. Additionally, it may be slightly less readily available than more widely recognized brands, although it is certainly worth the effort to seek out this exceptional product. Taking into account the advantages and potential limitations, it is evident that the Gebildet JD1912 Car Relay Harness is a commendable choice. Its durable construction, user-friendly features, and adaptability make it a standout product in the realm of car relay harnesses. I wholeheartedly recommend this harness to anyone in search of a reliable and convenient solution for their automotive electrical needs. ### ⭐⭐⭐⭐⭐ Helped Bypass my 2025 Civic BCM *by J***. on April 28, 2026* I tried hooking up some new LED lights for my 2025 Civic's trunk by "piggy backing" from the factory trunk light cicuit. Little did I know that it trips the car's BCM and turned off all the interior lights. Doing research, I found out about using this relay with a diode would do the trick, and with the very little knowledge I have with electrical wiring, I was able to successfully and, most importantly, safely switch the lights on when my trunk opens up without triggering the BCM. I am very happy with this product. With a little research on how to wire this, it works like a charm for a very reasonable price since it comes in a pack of two. I also like that it's a socket type, so having to connect four wires was a little more flexible to work with and also that there are no exposed wires. ### ⭐⭐⭐⭐⭐ Great product! *by C***Y on March 30, 2026* My headlights on my 94 Chevy K1500 would start flickering after about 30 min. This relay fixed the problem! Awesome product! ## 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.us/products/61018792-gebildet-2pcs-12v-40a-4-pin-spst-car-relay-harness](https://www.desertcart.us/products/61018792-gebildet-2pcs-12v-40a-4-pin-spst-car-relay-harness) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-19*