---
product_id: 61018792
title: "2pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Motorcycle Boat"
brand: "gebildet"
price: "€ 17.53"
currency: EUR
in_stock: true
reviews_count: 12
category: "Gebildet"
url: https://www.desertcart.gr/products/61018792-2pcs-jd1912-car-relay-harness-12v-40a-4-pin-spst
store_origin: GR
region: Greece
---

# 40A high current capacity 4 Pin SPST socket mount Built-in diode for voltage protection 2pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Motorcycle Boat

**Brand:** gebildet
**Price:** € 17.53
**Availability:** ✅ In Stock

## Summary

> ⚡ Elevate your ride’s electrical game with Gebildet’s powerhouse relay harness!

## Quick Answers

- **What is this?** 2pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Motorcycle Boat by gebildet
- **How much does it cost?** € 17.53 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/61018792-2pcs-jd1912-car-relay-harness-12v-40a-4-pin-spst)

## 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 to Last:** Silver alloy contacts and 100,000 electrical cycles guarantee long-term reliability
- • **Voltage Guardian:** Integrated diode suppresses voltage spikes, protecting your vehicle’s electronics
- • **Plug & Play Precision:** 4-pin SPST socket mount design ensures seamless, error-free installation
- • **Versatile Compatibility:** Perfect for cars, trucks, motorcycles, and boats with 12V DC systems
- • **Power Up with Confidence:** Handles up to 40 amps at 12V for robust automotive performance

## Overview

The Gebildet JD1912 Car Relay Harness is a premium 12V 40A 4-pin SPST socket mount relay with built-in diode protection. Designed for automotive, truck, motorcycle, and boat applications, it features silver alloy contacts for durability and supports up to 100,000 electrical operations. Its color-coded wiring and robust construction simplify installation while ensuring reliable, high-current performance under harsh conditions.

## 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 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. 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.

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: Just start u needed - The relay worked great for what I needed. I'll be adding wire to put in a better place but, the relay itself is great.

## Features

- Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B078T8CMF6 |
| Best Sellers Rank | #1,851 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Starter Relays |
| Brand | 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 4.7 out of 5 stars (2,196) |
| Date First Available | January 4, 2018 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 4.6 ounces |
| Item model number | E079 |
| Manufacturer | Gebildet |
| Manufacturer Part Number | E079 |
| Maximum Switching Current | 40 Amps |
| Minimum Switching Voltage | 8 Volts |
| Mounting Type | Socket Mount |
| Operation Mode | Manual |
| Package Dimensions | 9.02 x 2.64 x 1.3 inches |
| UPC | 694090222994 |
| 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

![2pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Motorcycle Boat - Image 1](https://m.media-amazon.com/images/I/5120-sOHvbL.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.

### ⭐⭐⭐⭐⭐ Just start u needed
*by J***W on January 11, 2026*

The relay worked great for what I needed. I'll be adding wire to put in a better place but, the relay itself is great.

### ⭐⭐⭐⭐⭐ Perfect for my Power Switching on my motorcycle accessories
*by M***K on May 4, 2024*

Two for the price of one is always a great deal! The price is very good for this power relay switch. The device is properly sealed in a case to make it waterproof. It comes with a connector that likewise seals well when plugged in to the relay. This is rated perfectly to carry the current and power needs for all of my motorcycle accessories. I wanted to isolate all of my add-ons so that when the bike sits dormant the drain on the battery is greatly reduced. My circuit includes this relay between my accessory terminal to a power distribution block with fuses. When the motorcycle is turned on the relay engages sending power to the distribution block. The block has six accessories wired with individual fuses on each circuit. When the relay engages power is available to the block and sent to each of the six accessories. By isolating the power to the accessories with the relay they cannot draw even a trickle current from the battery when the motorcycle is powered off. The relay has a diagram on the top of the case to show the circuit but these are stamped into the case and very difficult to read. More importantly, the relay does NOT come with any directions whatever! There are four leads/wires coming from the included plug which are color coded. I was able to determine by testing with a meter which lead was Common, Positive, Line and Load. The plug terminals are uniquely oriented so that it is not possible to insert the relay incorrectly which I deeply appreciated. You need to have a thorough understanding of circuitry to properly install and use this. Two wires power the relay itself, the other two break/complete your desired circuit power. Make sure your power demand is aligned with the ratings of this relay. It is robust and spec'd for most common power needs for outdoor vehicle accessories. NOTE: The photo shows three items, the relay and plug which are included, and the power distribution block with IS NOT included. I just showed to illustrate my setup. Prior to installing this relay and distribution block I had 7 or 8 different wires and terminals connected to the positive/negative terminals on the battery. What a rats nest! This new circuit setup reduces the wires directly connected to the battery, provides circuit protection and clean wire routing. In operation the relay works flawlessly. Aside from the lack of instructions I feel this is a great value as the product works well, comes with the necessary plug and you get TWO of each.

## 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)
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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-02-07*