2pcs 12V 40A 4 Pin SPST Car Relay Harness JD1912, 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Boat Motorcycle

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.

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.

My headlights on my 94 Chevy K1500 would start flickering after about 30 min. This relay fixed the problem! Awesome product!

Working great!

These work just fine for general use. The wires feel a little loose coming out of the bottom but do not seem to impact the functionality. Fit and finish isn’t amazing. But they work just fine for most simple 4 pin relay needs. I use this relay setup to control a ground switched circuit on my car that enables my fog lights. So far so good. Waterproof: Not waterproof, does not even claim to be as far as I know. I really wish it was however. Quality: It’s decent enough for an inexpensive relay. So far has not burned my car down. So that’s a glowing endorsement for this product I guess. Wire gauge was perfectly fine for 20a or below circuits from what I can tell. Wire length: Wire length is perfectly acceptable for a standard 4 pin relay. Ease of use: If you know how to wire a relay you should be just fine. Relay wire ends come pre stripped and was a nice touch. Fit: Fit and finish was pretty loose. So I am knocking a star off. If it was tighter I would have more confidence but it’s not so loose to be unusable. Why did you pick this product vs others?: I picked this because of the value.

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.

great product

Easy to install. Works great! No more dead car batteries.

使いやすい

Belle qualité de cable et relais efficace.

説明通りだとACC電源違うしキーONしたらヒューズとぶし配線付け替えてもダメ。容量減るからつけなかったエーモンのリレー使ったら一発解決です。リレー自体に問題あるのかな…安物買いの銭失いでした。

Worked perfect for re wiring my heater fan on my tractor.

I haven't installed them yet but they seem to be good quality. I would install them in the cab of a vehicle, nowhere they would be subjected to dampness or dirt. They don't have a water resistant plug.