I received the jd2912 relays. what email address do i email?

You can contact son of wil through Amazon.

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?

The red wire goes to the device that you want to turn on and the black to that Device

what gauge wire on battery terminals

I used a 14 gauge wire to the battery

I have a positively grounded (+ ground) system. The relay coil should still operate correct?

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.

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

JD1912 Car Relay Harness 12V 40A 4 Pin SPST Harness Sockets with Color-Labeled Wires for Automotive Truck Van Motorcycle Boat (Pack of 2)

Product ID: 375776044

Details

Connector type
Spade
Contact material
Silver Alloy
Contact type
Normally Open
Current rating
40 Amps
Mounting type
Socket Mount

⚡40A high current capacity

🔋12V DC compatibility

⏱️15ms fast operate time

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

MOP$204

Duties & taxes included

In stock

Sold byAmazon MacauDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Macau.

Secure transaction

Description

🚗 Power your ride with precision and protection!

RAPID RESPONSE RELAY - Operates in just 15 milliseconds to keep your systems running smoothly.
POWERHOUSE PERFORMANCE - Handles up to 40 Amps seamlessly for your automotive needs.
DURABILITY YOU CAN TRUST - Engineered for 100,000 electrical cycles and a wide temperature range (-55°C to 70°C).
BUILT IN VOLTAGE PROTECTION - Integrated diode suppresses voltage spikes, safeguarding your electronics.
UNIVERSAL 12 V COMPATIBILITY - Perfectly fits all 12V DC vehicles and devices—trucks, motorcycles, boats, and more.

The JD1912 Car Relay Harness is a robust 12V 40A 4-pin SPST relay socket set designed for automotive, truck, motorcycle, and boat applications. Featuring a built-in diode for voltage spike suppression, silver alloy contacts for reliable conductivity, and rapid 15ms switching, it ensures durable, high-performance electrical control with a lifespan of up to 100,000 operations. Compatible with all 12V DC systems, this harness offers professional-grade reliability and protection in extreme conditions.

Specifications

ASIN	B078T8CMF6
Best Sellers Rank	#29,710 in Automotive ( See Top 100 in Automotive ) #9 in Automotive Starter Relays
Brand	Gebildet
Brand Name	Gebildet
Coil Resistance	100 Megaohms
Coil Voltage	12 Volts (DC)
Connector Type	Spade
Connector type	Spade
Contact Current Rating	40 Amps
Contact Material	Silver Alloy
Contact Type	Normally Open
Contact material	Silver Alloy
Contact type	Normally Open
Current Rating	40 Amps
Current rating	40 Amps
Customer Reviews	4.7 out of 5 stars 2,222 Reviews
Manufacturer	Gebildet
Maximum Switching Current	40 Amps
Minimum Switching Voltage	8 Volts
Model	E079
Mounting Type	Socket Mount
Mounting type	Socket Mount
Operating Time	0.02 Seconds
Operation Mode	Manual
Part Number	E079
UPC	694090222994
Upper Temperature Rating	70 Degrees Celsius
Wattage	480 watts

Reviews

T**S

Belle qualité

Belle qualité de cable et relais efficace.

11.10.2025

K**I

こりゃダメだ。

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。

7.03.2026

G**.

Good quality Relay

28.06.2023

M**K

Perfect for my Power Switching on my motorcycle accessories

4.05.2024

伊**男

いらないものです

テレビ📺が見れません

4.11.2025

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Pooja R.

The customer service exceeded my expectations. Perfect for buying products you can't find elsewhere.

1 week ago

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.