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

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

Product ID: 61018792

Details

Connector Type
Spade
Contact Material
Silver Alloy
Contact Type
Normally Open
Current Rating
40 A
Mounting Type
Socket Mount

⚡40A high current capacity

🔋12V standard automotive voltage

⏱️15ms fast operate time

€ 18.63

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered 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 Slovakia.

Secure transaction

Description

⚡ Power up your ride with precision and protection!

ROBUST DURABILITY - Rated for 100,000 electrical and 10 million mechanical operations—built to outlast your ride.
RAPID SWITCHING SPEED - Operate and release times of 15ms and 10ms keep your systems responsive and efficient.
BUILT IN DIODE PROTECTION - Safeguards your vehicle’s electronics from voltage spikes for ultimate reliability.
UNIVERSAL 12 V COMPATIBILITY - Perfect fit for cars, trucks, boats, and motorcycles—upgrade your vehicle’s electrical system with confidence.
PREMIUM SILVER ALLOY CONTACTS - Ensures ultra-low resistance (≤100mΩ) and long-lasting performance under heavy loads.

The Gebildet 12V 40A 4 Pin SPST Car Relay Harness features a built-in diode for voltage spike suppression, premium silver alloy contacts with ultra-low resistance, and rapid 15ms switching times. Designed for durability with 100,000 electrical and 10 million mechanical operations, this 12AWG socket mount relay harness is compatible with all 12V automotive and marine applications, ensuring reliable, long-lasting performance.

Specifications

ASIN	B078T8CMF6
Best Sellers Rank	#1,579 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Starter Relays
Brand Name	Gebildet
Coil Voltage	12 volts
Connector Type	Spade
Contact Current Rating	40 A
Contact Material	Silver Alloy
Contact Type	Normally Open
Current Rating	40 A
Customer Reviews	4.7 4.7 out of 5 stars (2,438)
Manufacturer	Gebildet
Maximum Switching Current	40 A
Minimum Switching Voltage	8 volts
Model	E079
Mounting Type	Socket Mount
Number of Items	2
Number of Packs	2
Operating Time	0.02 seconds
Operation Mode	Manual
Part Number	E079
UPC	694090222994
Unit Count	2 Count
Upper Temperature Rating	70 °C
Wattage	480 watts

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

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

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.